Added code

9 years ago · d3bba80288
commit d3bba80288
18 changed files with 2041 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,39 @@
+# Temporary files
+
+*.bak
+*.lnp
+*.iex
+*.hex
+*.elf
+*.axf
+*.htm
+*.lnp
+*.lst
+*.plg
+*.tra
+*.o
+*.map
+*.d
+*.dep
+*.disasm
+*.bin
+*.log
+
+*.pro.*
+
+# Backup files
+
+*.bak
+*~
+
+# Keil temporary files
+
+*.uvguix.*
+/RTE/
+
+# DS-5 temporary files
+
+/.externalToolBuilders
+
+
+/trash/
--- a/143
+++ b/143
@ -0,0 +1,143 @@
+DEFS		= -DSTM32L1
+
+FP_FLAGS	?= -msoft-float
+ARCH_FLAGS	= -mthumb -mcpu=cortex-m3 $(FP_FLAGS) -mfix-cortex-m3-ldrd
+
+LDSCRIPT    = stm32l100rc.ld
+
+################################################################
+
+# Main file
+BINARY      = main
+
+INCL_DIRS   = . lib source
+SRC_DIR     = source
+
+STARTUP_SCRIPT = startup_stm32l100xc.s
+
+OBJS += $(BINARY).o $(STARTUP_SCRIPT:.s=.o)
+OBJS += lib/gpio.o
+OBJS += lib/systick.o
+
+################################################################
+
+JUNK            = *.o *.d *.elf *.bin *.hex *.srec *.list *.map *.dis *.disasm
+
+###############################################################################
+###############################################################################
+###############################################################################
+
+# Be silent per default, but 'make V=1' will show all compiler calls.
+ifneq ($(V),1)
+  Q     := @
+  NULL  := 2>/dev/null
+endif
+
+###############################################################################
+# Executables
+
+PREFIX  ?= arm-none-eabi
+
+CC      := $(PREFIX)-gcc
+CXX     := $(PREFIX)-g++
+LD      := $(PREFIX)-gcc
+AR      := $(PREFIX)-ar
+AS      := $(PREFIX)-as
+OBJCOPY := $(PREFIX)-objcopy
+OBJDUMP := $(PREFIX)-objdump
+GDB     := $(PREFIX)-gdb
+STFLASH := $(shell which st-flash)
+
+###############################################################################
+
+# For CMSIS compatibility
+DEFS          += -D__weak="__attribute__((weak))" -D__packed="__attribute__((__packed__))"
+
+###############################################################################
+# C flags
+
+CFLAGS      += -Os -ggdb -std=gnu99 -Wfatal-errors
+CFLAGS      += -Wall -Wextra -Wshadow
+CFLAGS      += -Wwrite-strings -Wold-style-definition -Winline -Wmissing-noreturn -Wstrict-prototypes
+CFLAGS      += -Wredundant-decls -Wfloat-equal -Wsign-compare
+CFLAGS      += -fno-common -ffunction-sections -fdata-sections -Wunused-function
+CFLAGS      += -MD
+CFLAGS      += $(INCL_DIRS:%=-I%) $(DEFS)
+
+###############################################################################
+# Linker flags
+
+LDFLAGS     += --static -specs=nano.specs -lm -lc
+#LDFLAGS     += -L$(OCM3_LIB_DIR)
+LDFLAGS     += -T$(LDSCRIPT)
+LDFLAGS     += -Wl,-Map=$(*).map
+LDFLAGS     += -Wl,--gc-sections
+
+###############################################################################
+# Used libraries
+
+LDLIBS		+= -lm
+LDLIBS		+= -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group
+
+###############################################################################
+###############################################################################
+###############################################################################
+
+.SUFFIXES: .elf .bin .hex .srec .list .map .images
+.SECONDEXPANSION:
+.SECONDARY:
+
+all: elf
+
+ttyusb:
+	gtkterm -s 115200 -p /dev/ttyUSB0
+
+ttyacm:
+	gtkterm -p /dev/ttyACM0
+
+elf: $(BINARY).elf
+bin: $(BINARY).bin
+hex: $(BINARY).hex
+srec: $(BINARY).srec
+list: $(BINARY).list
+
+images: $(BINARY).images
+flash: $(BINARY).flash
+
+dis: $(BINARY).elf
+	$(Q)$(OBJDUMP) -dS $(BINARY).elf -j .text -j .isr_vector > $(BINARY).dis
+
+%.images: %.bin %.hex %.srec %.list %.map
+
+%.bin: %.elf
+	$(Q)$(OBJCOPY) -Obinary $(*).elf $(*).bin
+
+%.hex: %.elf
+	$(Q)$(OBJCOPY) -Oihex $(*).elf $(*).hex
+
+%.srec: %.elf
+	$(Q)$(OBJCOPY) -Osrec $(*).elf $(*).srec
+
+%.list: %.elf
+	$(Q)$(OBJDUMP) -S $(*).elf > $(*).list
+
+%.elf %.map: $(OBJS)
+	$(Q)$(LD) $(LDFLAGS) $(ARCH_FLAGS) $(OBJS) $(LDLIBS) -o $(*).elf
+
+%.o: %.c
+	$(Q)$(CC) $(CFLAGS) $(ARCH_FLAGS) -o $(*).o -c $(*).c
+
+%.o: %.s
+	$(Q)$(CC) $(CFLAGS) $(ARCH_FLAGS) -o $(*).o -c $(*).s
+
+clean:
+	$(Q)$(RM) $(JUNK)
+	$(Q)cd lib && $(RM) $(JUNK)
+
+%.flash: %.bin
+	@printf "  FLASH  $<\n"
+	$(Q)$(STFLASH) write $(*).bin 0x8000000
+
+.PHONY: images clean elf bin hex srec list dis ttyusb ttyacm
+
+-include $(OBJS:.o=.d)
--- a/lib/common.h
+++ b/lib/common.h
@ -0,0 +1,66 @@
+#pragma once
+
+/* Part of this file is based on libopencm3 */
+
+#include <stdint.h>
+#include <stdbool.h>
+
+
+/* Generic memory-mapped I/O accessor functions */
+#define MMIO8(addr)     (*(volatile uint8_t *)(addr))
+#define MMIO16(addr)        (*(volatile uint16_t *)(addr))
+#define MMIO32(addr)        (*(volatile uint32_t *)(addr))
+#define MMIO64(addr)        (*(volatile uint64_t *)(addr))
+
+/* Generic bit-band I/O accessor functions */
+#define BBIO_SRAM(addr, bit) \
+	MMIO32((((uint32_t)addr) & 0x0FFFFF) * 32 + 0x22000000 + (bit) * 4)
+
+#define BBIO_PERIPH(addr, bit) \
+	MMIO32((((uint32_t)addr) & 0x0FFFFF) * 32 + 0x42000000 + (bit) * 4)
+
+// i...iterator, m...mask, count...nr of bits
+#define BitFieldLoop(i, m, count) for (uint32_t i = 0, m = 1; i < count; m <<= 1, i++)
+
+
+#define BIT0  (1<<0)
+#define BIT1  (1<<1)
+#define BIT2  (1<<2)
+#define BIT3  (1<<3)
+#define BIT4  (1<<4)
+#define BIT5  (1<<5)
+#define BIT6  (1<<6)
+#define BIT7  (1<<7)
+#define BIT8  (1<<8)
+#define BIT9  (1<<9)
+#define BIT10 (1<<10)
+#define BIT11 (1<<11)
+#define BIT12 (1<<12)
+#define BIT13 (1<<13)
+#define BIT14 (1<<14)
+#define BIT15 (1<<15)
+#define BIT16 (1<<16)
+#define BIT17 (1<<17)
+#define BIT18 (1<<18)
+#define BIT19 (1<<19)
+#define BIT20 (1<<20)
+#define BIT21 (1<<21)
+#define BIT22 (1<<22)
+#define BIT23 (1<<23)
+#define BIT24 (1<<24)
+#define BIT25 (1<<25)
+#define BIT26 (1<<26)
+#define BIT27 (1<<27)
+#define BIT28 (1<<28)
+#define BIT29 (1<<29)
+#define BIT30 (1<<30)
+#define BIT31 (1<<31)
+
+
+
+#include "defs_base.h"
+#include "defs_gpio.h"
+#include "defs_rcc.h"
+#include "defs_flash.h"
+#include "defs_systick.h"
+#include "defs_usart.h"
--- a/lib/defs_base.h
+++ b/lib/defs_base.h
@ -0,0 +1,100 @@
+#pragma once
+
+#include "common.h"
+
+// AUTHOR : Ondrej Hruska
+// DATE   : 12/2015
+// DESCR  : Base library file. This file must be included before any other library
+//          files. This file defines memory map and base addresses of peripherals.
+
+
+#define FLASH_BASE            0x08000000                 // FLASH base address in the alias region
+#define SRAM_BASE             0x20000000                 // SRAM base address in the alias region
+#define PERIPH_BASE           0x40000000                 // Peripheral base address in the alias region
+
+#define SRAM_BB_BASE          (SRAM_BASE   + 0x02000000) // SRAM base address in the bit-band region
+#define PERIPH_BB_BASE        (PERIPH_BASE + 0x02000000) // Peripheral base address in the bit-band region
+
+
+// ------------------------- System Config Blocks -----------------------------
+
+#define _SCS_BASE             0xE000E000                 // System Control Space base
+#define _SCB                  (_SCS_BASE + 0x0D00)       // System Control Block base
+#define _NVIC                 (_SCS_BASE + 0x0100)       // Nested Interrupt Vector Controller base
+#define _OB                   0x1FF80000                 // FLASH Option Bytes base address
+#define _AES                  0x50060000                 // Encryption module
+#define _FSMC                 0xA0000000                 // External Memory Control base
+#define _DBGMCU               0xE0042000                 // Debug MCU registers base address
+
+
+// ----------------------------- Peripherals ----------------------------------
+
+// *** Peripheral bus bases ***
+#define _APB1                  PERIPH_BASE               // Advanced Peripheral Bus 1 base
+#define _APB2                 (PERIPH_BASE + 0x10000)    // Advanced Peripheral Bus 2 base
+#define _AHB                  (PERIPH_BASE + 0x20000)    // Advanced High-speed Bus base
+
+// *** Peripheral Bus 1 devices ***
+
+#define _TIM2                 (_APB1 + 0x0000)           // Timer bases
+#define _TIM3                 (_APB1 + 0x0400)
+#define _TIM4                 (_APB1 + 0x0800)
+#define _TIM5                 (_APB1 + 0x0C00)
+#define _TIM6                 (_APB1 + 0x1000)
+#define _TIM7                 (_APB1 + 0x1400)
+
+#define _LCD                  (_APB1 + 0x2400)           // LCD controller base
+#define _RTC                  (_APB1 + 0x2800)           // RTC base
+
+#define _WWDG                 (_APB1 + 0x2C00)           // Window Watchdog base
+#define _IWDG                 (_APB1 + 0x3000)           // Independent Watchdog base
+
+#define _SPI2                 (_APB1 + 0x3800)           // SPI base
+#define _SPI3                 (_APB1 + 0x3C00)
+
+#define _USART2               (_APB1 + 0x4400)           // USART base
+#define _USART3               (_APB1 + 0x4800)
+
+#define _UART4                (_APB1 + 0x4C00)           // UART base (?)
+#define _UART5                (_APB1 + 0x5000)
+
+#define _I2C1                 (_APB1 + 0x5400)           // I2C base
+#define _I2C2                 (_APB1 + 0x5800)
+
+#define _PWR                  (_APB1 + 0x7000)           // Power Control block base
+#define _DAC                  (_APB1 + 0x7400)           // D/A config base
+#define _COMP                 (_APB1 + 0x7C00)           // Analog Comparator base
+#define _RI                   (_APB1 + 0x7C04)           // Routing Interface base (analog pin connections)
+#define _OPAMP                (_APB1 + 0x7C5C)           // OpAmp config base
+
+#define _USB                  (_APB1 + 0x5C00)           // USB registers base
+
+// *** Peripheral Bus 2 devices ***
+
+#define _TIM9                 (_APB2 + 0x0800)           // Timer base
+#define _TIM10                (_APB2 + 0x0C00)
+#define _TIM11                (_APB2 + 0x1000)
+
+#define _SYSCFG               (_APB2 + 0x0000)           // System config block base
+#define _EXTI                 (_APB2 + 0x0400)           // External interrupt settings base
+
+#define _ADC1                 (_APB2 + 0x2400)           // A/D 1
+#define _ADCC                 (_APB2 + 0x2700)           // common A/D registers base
+
+#define _SDIO                 (_APB2 + 0x2C00)           // SD host
+#define _SPI1                 (_APB2 + 0x3000)           // SPI
+#define _USART1               (_APB2 + 0x3800)
+
+
+
+// *** High Speed Bus devices ***
+
+#define _GPIO                 (_AHB + 0x0000)            // GPIO block base
+
+#define _CRC                  (_AHB + 0x3000)            // CRC module base
+#define _RCC                  (_AHB + 0x3800)            // Reset and Clock Config base
+
+#define _DMA1                 (_AHB + 0x6000)            // DMA control base
+#define _DMA2                 (_AHB + 0x6400)
+
+#define _FLASH                (_AHB + 0x3C00)            // FLASH control base
--- a/lib/defs_flash.h
+++ b/lib/defs_flash.h
@ -0,0 +1,115 @@
+#pragma once
+
+#include "common.h"
+
+// AUTHOR : Ondrej Hruska
+// DATE   : 12/2015
+// DESCR  : Control registers and bit masks for FLASH control
+//
+//                FLASH, DATA EEPROM and Option Bytes Registers
+
+
+//****************************************************************************
+//*
+//*                               REGISTERS
+//*
+//****************************************************************************
+
+
+// FLASH registers
+
+#define FLASH_ACR           MMIO32(_FLASH + 0x00) // Access control register,
+#define FLASH_PECR          MMIO32(_FLASH + 0x04) // Program/erase control register,
+#define FLASH_PDKEYR        MMIO32(_FLASH + 0x08) // Power down key register,
+#define FLASH_PEKEYR        MMIO32(_FLASH + 0x0c) // Program/erase key register,
+#define FLASH_PRGKEYR       MMIO32(_FLASH + 0x10) // Program memory key register,
+#define FLASH_OPTKEYR       MMIO32(_FLASH + 0x14) // Option byte key register,
+#define FLASH_SR            MMIO32(_FLASH + 0x18) // Status register,
+#define FLASH_OBR           MMIO32(_FLASH + 0x1c) // Option byte register,
+#define FLASH_WRPR          MMIO32(_FLASH + 0x20) // Write protection register,
+#define FLASH_WRPR1         MMIO32(_FLASH + 0x28) // Write protection register 1,
+#define FLASH_WRPR2         MMIO32(_FLASH + 0x2C) // Write protection register 2,
+
+// FLASH option bytes (maybe incorrect, not tested)
+
+#define OB_RDP              MMIO32(_OB + 0x00) // Read protection register,
+#define OB_USER             MMIO32(_OB + 0x04) // user register,
+#define OB_WRP01            MMIO32(_OB + 0x08) // write protection register 0 1,
+#define OB_WRP23            MMIO32(_OB + 0x0C) // write protection register 2 3,
+#define OB_WRP45            MMIO32(_OB + 0x10) // write protection register 4 5,
+#define OB_WRP67            MMIO32(_OB + 0x14) // write protection register 6 7,
+#define OB_WRP89            MMIO32(_OB + 0x18) // write protection register 8 9,
+#define OB_WRP1011          MMIO32(_OB + 0x1C) // write protection register 10 11,
+
+
+
+//****************************************************************************
+//*
+//*                       BIT MASKS AND DEFINITIONS
+//*
+//****************************************************************************
+
+
+//******************  Bit definition for FLASH_ACR register  *****************
+#define FLASH_ACR_LATENCY                   0x00000001        // Latency
+#define FLASH_ACR_PRFTEN                    0x00000002        // Prefetch Buffer Enable
+#define FLASH_ACR_ACC64                     0x00000004        // Access 64 bits
+#define FLASH_ACR_SLEEP_PD                  0x00000008        // Flash mode during sleep mode
+#define FLASH_ACR_RUN_PD                    0x00000010        // Flash mode during RUN mode
+
+//******************  Bit definition for FLASH_PECR register  *****************
+#define FLASH_PECR_PELOCK                    0x00000001        // FLASH_PECR and Flash data Lock
+#define FLASH_PECR_PRGLOCK                   0x00000002        // Program matrix Lock
+#define FLASH_PECR_OPTLOCK                   0x00000004        // Option byte matrix Lock
+#define FLASH_PECR_PROG                      0x00000008        // Program matrix selection
+#define FLASH_PECR_DATA                      0x00000010        // Data matrix selection
+#define FLASH_PECR_FTDW                      0x00000100        // Fixed Time Data write for Word/Half Word/Byte programming
+#define FLASH_PECR_ERASE                     0x00000200        // Page erasing mode
+#define FLASH_PECR_FPRG                      0x00000400        // Fast Page/Half Page programming mode
+#define FLASH_PECR_PARALLBANK                0x00008000        // Parallel Bank mode
+#define FLASH_PECR_EOPIE                     0x00010000        // End of programming interrupt
+#define FLASH_PECR_ERRIE                     0x00020000        // Error interrupt
+#define FLASH_PECR_OBL_LAUNCH                0x00040000        // Launch the option byte loading
+
+//*****************  Bit definition for FLASH_PDKEYR register  *****************
+#define FLASH_PDKEYR_PDKEYR                 0xFFFFFFFF       // FLASH_PEC and data matrix Key
+
+//*****************  Bit definition for FLASH_PEKEYR register  *****************
+#define FLASH_PEKEYR_PEKEYR                 0xFFFFFFFF       // FLASH_PEC and data matrix Key
+
+//*****************  Bit definition for FLASH_PRGKEYR register  *****************
+#define FLASH_PRGKEYR_PRGKEYR               0xFFFFFFFF        // Program matrix Key
+
+//*****************  Bit definition for FLASH_OPTKEYR register  *****************
+#define FLASH_OPTKEYR_OPTKEYR               0xFFFFFFFF        // Option bytes matrix Key
+
+//*****************  Bit definition for FLASH_SR register  ******************
+#define FLASH_SR_BSY                        0x00000001        // Busy
+#define FLASH_SR_EOP                        0x00000002        // End Of Programming
+#define FLASH_SR_ENHV                       0x00000004        // End of high voltage
+#define FLASH_SR_READY                      0x00000008        // Flash ready after low power mode
+
+#define FLASH_SR_WRPERR                     0x00000100        // Write protected error
+#define FLASH_SR_PGAERR                     0x00000200        // Programming Alignment Error
+#define FLASH_SR_SIZERR                     0x00000400        // Size error
+#define FLASH_SR_OPTVERR                    0x00000800        // Option validity error
+#define FLASH_SR_OPTVERRUSR                 0x00001000        // Option User validity error
+#define FLASH_SR_RDERR                      0x00002000        // Read protected error
+
+//*****************  Bit definition for FLASH_OBR register  ******************
+#define FLASH_OBR_RDPRT                     0x000000AA        // Read Protection
+#define FLASH_OBR_SPRMOD                    0x00000100        // Selection of protection mode of WPRi bits  (available only in STM32L1xx Medium-density Plus devices)
+#define FLASH_OBR_BOR_LEV                   0x000F0000        // BOR_LEV[3:0] Brown Out Reset Threshold Level
+#define FLASH_OBR_IWDG_SW                   0x00100000        // IWDG_SW
+#define FLASH_OBR_nRST_STOP                 0x00200000        // nRST_STOP
+#define FLASH_OBR_nRST_STDBY                0x00400000        // nRST_STDBY
+#define FLASH_OBR_BFB2                      0x00800000        // BFB2(available only in STM32L1xx High-density devices)
+
+//*****************  Bit definition for FLASH_WRPR register  *****************
+#define FLASH_WRPR_WRP                      0xFFFFFFFF        // Write Protection bits
+
+//*****************  Bit definition for FLASH_WRPR1 register  ****************
+#define FLASH_WRPR1_WRP                     0xFFFFFFFF        // Write Protection bits (available only in STM32L1xx  Medium-density Plus and High-density devices)
+
+//*****************  Bit definition for FLASH_WRPR2 register  ****************
+#define FLASH_WRPR2_WRP                     0xFFFFFFFF        // Write Protection bits (available only in STM32L1xx High-density devices)
--- a/lib/defs_gpio.h
+++ b/lib/defs_gpio.h
@ -0,0 +1,117 @@
+#pragma once
+
+#include "common.h"
+
+// AUTHOR : Ondrej Hruska
+// DATE   : 10/2015
+// DESCR  : Control registers and bit masks for GPIO
+
+
+// offsets
+#define GPIO_MODER_offs    0x00  // GPIOA pin mode register,
+#define GPIO_OTYPER_offs   0x04  // GPIOA output type register,
+#define GPIO_OSPEEDR_offs  0x08  // GPIOA output speed register,
+#define GPIO_PUPDR_offs    0x0C  // GPIOA pull-up/pull-down register,
+#define GPIO_IDR_offs      0x10  // GPIOA input data register,
+#define GPIO_ODR_offs      0x14  // GPIOA output data register,
+#define GPIO_BSRR_offs     0x18  // GPIOA bit set/reset register,
+#define GPIO_LCKR_offs     0x1C  // GPIOA configuration lock register,
+#define GPIO_AFR_offs      0x20  // GPIOA alternate function register,
+#define GPIO_BRR_offs      0x28  // GPIOA bit reset register,
+
+#define GPIOA              (_GPIO + 0x0000)
+#define GPIOB              (_GPIO + 0x0400)
+#define GPIOC              (_GPIO + 0x0800)
+#define GPIOD              (_GPIO + 0x0C00)
+#define GPIOE              (_GPIO + 0x1000)
+#define GPIOH              (_GPIO + 0x1400)
+#define GPIOF              (_GPIO + 0x1800)
+#define GPIOG              (_GPIO + 0x1C00)
+
+#define GPIOA_MODER         MMIO32(GPIOA + 0x00)              // GPIOA pin mode register,
+#define GPIOA_OTYPER        MMIO32(GPIOA + 0x04)              // GPIOA output type register,
+#define GPIOA_OSPEEDR       MMIO32(GPIOA + 0x08)              // GPIOA output speed register,
+#define GPIOA_PUPDR         MMIO32(GPIOA + 0x0C)              // GPIOA pull-up/pull-down register,
+#define GPIOA_IDR           MMIO32(GPIOA + 0x10)              // GPIOA input data register,
+#define GPIOA_ODR           MMIO32(GPIOA + 0x14)              // GPIOA output data register,
+#define GPIOA_BSRR          MMIO32(GPIOA + 0x18)              // GPIOA bit set/reset register,
+#define GPIOA_LCKR          MMIO32(GPIOA + 0x1C)              // GPIOA configuration lock register,
+#define GPIOA_AFR           MMIO64(GPIOA + 0x20)               // GPIOA alternate function register,
+#define GPIOA_BRR           MMIO32(GPIOA + 0x28)              // GPIOA bit reset register,
+
+#define GPIOB_MODER         MMIO32(GPIOB + 0x00)              // GPIOB pin mode register,
+#define GPIOB_OTYPER        MMIO32(GPIOB + 0x04)              // GPIOB output type register,
+#define GPIOB_OSPEEDR       MMIO32(GPIOB + 0x08)              // GPIOB output speed register,
+#define GPIOB_PUPDR         MMIO32(GPIOB + 0x0C)              // GPIOB pull-up/pull-down register,
+#define GPIOB_IDR           MMIO32(GPIOB + 0x10)              // GPIOB input data register,
+#define GPIOB_ODR           MMIO32(GPIOB + 0x14)              // GPIOB output data register,
+#define GPIOB_BSRR          MMIO32(GPIOB + 0x18)              // GPIOB bit set/reset register,
+#define GPIOB_LCKR          MMIO32(GPIOB + 0x1C)              // GPIOB configuration lock register,
+#define GPIOB_AFR           MMIO64(GPIOB + 0x20)              // GPIOB alternate function low register,
+#define GPIOB_BRR           MMIO32(GPIOB + 0x28)              // GPIOB bit reset register,
+
+#define GPIOC_MODER         MMIO32(GPIOC + 0x00)              // GPIOC pin mode register,
+#define GPIOC_OTYPER        MMIO32(GPIOC + 0x04)              // GPIOC output type register,
+#define GPIOC_OSPEEDR       MMIO32(GPIOC + 0x08)              // GPIOC output speed register,
+#define GPIOC_PUPDR         MMIO32(GPIOC + 0x0C)              // GPIOC pull-up/pull-down register,
+#define GPIOC_IDR           MMIO32(GPIOC + 0x10)              // GPIOC input data register,
+#define GPIOC_ODR           MMIO32(GPIOC + 0x14)              // GPIOC output data register,
+#define GPIOC_BSRR          MMIO32(GPIOC + 0x18)              // GPIOC bit set/reset register,
+#define GPIOC_LCKR          MMIO32(GPIOC + 0x1C)              // GPIOC configuration lock register,
+#define GPIOC_AFR           MMIO64(GPIOC + 0x20)              // GPIOC alternate function low register,
+#define GPIOC_BRR           MMIO32(GPIOC + 0x28)              // GPIOC bit reset register,
+
+#define GPIOD_MODER         MMIO32(GPIOD + 0x00)              // GPIOD pin mode register,
+#define GPIOD_OTYPER        MMIO32(GPIOD + 0x04)              // GPIOD output type register,
+#define GPIOD_OSPEEDR       MMIO32(GPIOD + 0x08)              // GPIOD output speed register,
+#define GPIOD_PUPDR         MMIO32(GPIOD + 0x0C)              // GPIOD pull-up/pull-down register,
+#define GPIOD_IDR           MMIO32(GPIOD + 0x10)              // GPIOD input data register,
+#define GPIOD_ODR           MMIO32(GPIOD + 0x14)              // GPIOD output data register,
+#define GPIOD_BSRR          MMIO32(GPIOD + 0x18)              // GPIOD bit set/reset register,
+#define GPIOD_LCKR          MMIO32(GPIOD + 0x1C)              // GPIOD configuration lock register,
+#define GPIOD_AFR           MMIO64(GPIOD + 0x20)              // GPIOD alternate function low register,
+#define GPIOD_BRR           MMIO32(GPIOD + 0x28)              // GPIOD bit reset register,
+
+#define GPIOE_MODER         MMIO32(GPIOE + 0x00)              // GPIOE pin mode register,
+#define GPIOE_OTYPER        MMIO32(GPIOE + 0x04)              // GPIOE output type register,
+#define GPIOE_OSPEEDR       MMIO32(GPIOE + 0x08)              // GPIOE output speed register,
+#define GPIOE_PUPDR         MMIO32(GPIOE + 0x0C)              // GPIOE pull-up/pull-down register,
+#define GPIOE_IDR           MMIO32(GPIOE + 0x10)              // GPIOE input data register,
+#define GPIOE_ODR           MMIO32(GPIOE + 0x14)              // GPIOE output data register,
+#define GPIOE_BSRR          MMIO32(GPIOE + 0x18)              // GPIOE bit set/reset register,
+#define GPIOE_LCKR          MMIO32(GPIOE + 0x1C)              // GPIOE configuration lock register,
+#define GPIOE_AFR           MMIO64(GPIOE + 0x20)              // GPIOE alternate function low register,
+#define GPIOE_BRR           MMIO32(GPIOE + 0x28)              // GPIOE bit reset register,
+
+#define GPIOF_MODER         MMIO32(GPIOF + 0x00)              // GPIOF pin mode register,
+#define GPIOF_OTYPER        MMIO32(GPIOF + 0x04)              // GPIOF output type register,
+#define GPIOF_OSPEEDR       MMIO32(GPIOF + 0x08)              // GPIOF output speed register,
+#define GPIOF_PUPDR         MMIO32(GPIOF + 0x0C)              // GPIOF pull-up/pull-down register,
+#define GPIOF_IDR           MMIO32(GPIOF + 0x10)              // GPIOF input data register,
+#define GPIOF_ODR           MMIO32(GPIOF + 0x14)              // GPIOF output data register,
+#define GPIOF_BSRR          MMIO32(GPIOF + 0x18)              // GPIOF bit set/reset register,
+#define GPIOF_LCKR          MMIO32(GPIOF + 0x1C)              // GPIOF configuration lock register,
+#define GPIOF_AFR           MMIO64(GPIOF + 0x20)              // GPIOF alternate function low register,
+#define GPIOF_BRR           MMIO32(GPIOF + 0x28)              // GPIOF bit reset register,
+
+#define GPIOG_MODER         MMIO32(GPIOG + 0x00)              // GPIOG pin mode register,
+#define GPIOG_OTYPER        MMIO32(GPIOG + 0x04)              // GPIOG output type register,
+#define GPIOG_OSPEEDR       MMIO32(GPIOG + 0x08)              // GPIOG output speed register,
+#define GPIOG_PUPDR         MMIO32(GPIOG + 0x0C)              // GPIOG pull-up/pull-down register,
+#define GPIOG_IDR           MMIO32(GPIOG + 0x10)              // GPIOG input data register,
+#define GPIOG_ODR           MMIO32(GPIOG + 0x14)              // GPIOG output data register,
+#define GPIOG_BSRR          MMIO32(GPIOG + 0x18)              // GPIOG bit set/reset register,
+#define GPIOG_LCKR          MMIO32(GPIOG + 0x1C)              // GPIOG configuration lock register,
+#define GPIOG_AFR           MMIO64(GPIOG + 0x20)              // GPIOG alternate function low register,
+#define GPIOG_BRR           MMIO32(GPIOG + 0x28)              // GPIOG bit reset register,
+
+#define GPIOH_MODER         MMIO32(GPIOH + 0x00)              // GPIOH pin mode register,
+#define GPIOH_OTYPER        MMIO32(GPIOH + 0x04)              // GPIOH output type register,
+#define GPIOH_OSPEEDR       MMIO32(GPIOH + 0x08)              // GPIOH output speed register,
+#define GPIOH_PUPDR         MMIO32(GPIOH + 0x0C)              // GPIOH pull-up/pull-down register,
+#define GPIOH_IDR           MMIO32(GPIOH + 0x10)              // GPIOH input data register,
+#define GPIOH_ODR           MMIO32(GPIOH + 0x14)              // GPIOH output data register,
+#define GPIOH_BSRR          MMIO32(GPIOH + 0x18)              // GPIOH bit set/reset register,
+#define GPIOH_LCKR          MMIO32(GPIOH + 0x1C)              // GPIOH configuration lock register,
+#define GPIOH_AFR           MMIO64(GPIOH + 0x20)              // GPIOH alternate function low register,
+#define GPIOH_BRR           MMIO32(GPIOH + 0x28)              // GPIOH bit reset register,
--- a/lib/defs_rcc.h
+++ b/lib/defs_rcc.h
@ -0,0 +1,373 @@
+#pragma once
+
+#include "common.h"
+
+// RCC registers
+
+#define RCC_CR              MMIO32(_RCC + 0x00) // RCC clock control register,
+#define RCC_ICSCR           MMIO32(_RCC + 0x04) // RCC Internal clock sources calibration register,
+#define RCC_CFGR            MMIO32(_RCC + 0x08) // RCC Clock configuration register,
+#define RCC_CIR             MMIO32(_RCC + 0x0C) // RCC Clock interrupt register,
+#define RCC_AHBRSTR         MMIO32(_RCC + 0x10) // RCC AHB peripheral reset register,
+#define RCC_APB2RSTR        MMIO32(_RCC + 0x14) // RCC APB2 peripheral reset register,
+#define RCC_APB1RSTR        MMIO32(_RCC + 0x18) // RCC APB1 peripheral reset register,
+#define RCC_AHBENR          MMIO32(_RCC + 0x1C) // RCC AHB peripheral clock enable register,
+#define RCC_APB2ENR         MMIO32(_RCC + 0x20) // RCC APB2 peripheral clock enable register,
+#define RCC_APB1ENR         MMIO32(_RCC + 0x24) // RCC APB1 peripheral clock enable register,
+#define RCC_AHBLPENR        MMIO32(_RCC + 0x28) // RCC AHB peripheral clock enable in low power mode register,
+#define RCC_APB2LPENR       MMIO32(_RCC + 0x2C) // RCC APB2 peripheral clock enable in low power mode register,
+#define RCC_APB1LPENR       MMIO32(_RCC + 0x30) // RCC APB1 peripheral clock enable in low power mode register,
+#define RCC_CSR             MMIO32(_RCC + 0x34) // RCC Control/status register,
+
+
+
+//****************************************************************************
+//*
+//*                       BIT MASKS AND DEFINITIONS
+//*
+//****************************************************************************
+
+
+//*******************  Bit definition for RCC_CR register  *******************
+#define RCC_CR_HSION                        0x00000001        // Internal High Speed clock enable
+#define RCC_CR_HSIRDY                       0x00000002        // Internal High Speed clock ready flag
+
+#define RCC_CR_MSION                        0x00000100        // Internal Multi Speed clock enable
+#define RCC_CR_MSIRDY                       0x00000200        // Internal Multi Speed clock ready flag
+
+#define RCC_CR_HSEON                        0x00010000        // External High Speed clock enable
+#define RCC_CR_HSERDY                       0x00020000        // External High Speed clock ready flag
+#define RCC_CR_HSEBYP                       0x00040000        // External High Speed clock Bypass
+
+#define RCC_CR_PLLON                        0x01000000        // PLL enable
+#define RCC_CR_PLLRDY                       0x02000000        // PLL clock ready flag
+#define RCC_CR_CSSON                        0x10000000        // Clock Security System enable
+
+#define RCC_CR_RTCPRE                       0x60000000        // RTC/LCD Prescaler
+
+// prescaler levels
+#define RCC_CR_RTCPRE_DIV2                     0x00000000
+#define RCC_CR_RTCPRE_DIV4                     0x20000000
+#define RCC_CR_RTCPRE_DIV8                     0x40000000
+#define RCC_CR_RTCPRE_DIV16                    0x60000000
+
+//*******************  Bit definition for RCC_ICSCR register  ****************
+#define RCC_ICSCR_HSICAL                    0x000000FF        // Internal High Speed clock Calibration
+#define RCC_ICSCR_HSITRIM                   0x00001F00        // Internal High Speed clock trimming
+
+#define RCC_ICSCR_MSIRANGE                  0x0000E000        // Internal Multi Speed clock Range
+#define RCC_ICSCR_MSIRANGE_0                0x00000000        // Internal Multi Speed clock Range 65.536 KHz
+#define RCC_ICSCR_MSIRANGE_1                0x00002000        // Internal Multi Speed clock Range 131.072 KHz
+#define RCC_ICSCR_MSIRANGE_2                0x00004000        // Internal Multi Speed clock Range 262.144 KHz
+#define RCC_ICSCR_MSIRANGE_3                0x00006000        // Internal Multi Speed clock Range 524.288 KHz
+#define RCC_ICSCR_MSIRANGE_4                0x00008000        // Internal Multi Speed clock Range 1.048 MHz
+#define RCC_ICSCR_MSIRANGE_5                0x0000A000        // Internal Multi Speed clock Range 2.097 MHz
+#define RCC_ICSCR_MSIRANGE_6                0x0000C000        // Internal Multi Speed clock Range 4.194 MHz
+#define RCC_ICSCR_MSICAL                    0x00FF0000        // Internal Multi Speed clock Calibration
+#define RCC_ICSCR_MSITRIM                   0xFF000000        // Internal Multi Speed clock trimming
+
+//*******************  Bit definition for RCC_CFGR register  *****************
+#define RCC_CFGR_SW                         0x00000003        // SW[1:0] bits (System clock Switch)
+
+// SW configuration
+#define RCC_CFGR_SW_MSI                     0x00000000        // MSI selected as system clock
+#define RCC_CFGR_SW_HSI                     0x00000001        // HSI selected as system clock
+#define RCC_CFGR_SW_HSE                     0x00000002        // HSE selected as system clock
+#define RCC_CFGR_SW_PLL                     0x00000003        // PLL selected as system clock
+
+#define RCC_CFGR_SWS                        0x0000000C        // SWS[1:0] bits (System Clock Switch Status)
+
+// SWS configuration
+#define RCC_CFGR_SWS_MSI                    0x00000000        // MSI oscillator used as system clock
+#define RCC_CFGR_SWS_HSI                    0x00000004        // HSI oscillator used as system clock
+#define RCC_CFGR_SWS_HSE                    0x00000008        // HSE oscillator used as system clock
+#define RCC_CFGR_SWS_PLL                    0x0000000C        // PLL used as system clock
+
+#define RCC_CFGR_HPRE                       0x000000F0        // HPRE[3:0] bits (AHB prescaler)
+
+// HPRE configuration
+#define RCC_CFGR_HPRE_DIV1                  0x00000000        // SYSCLK not divided
+#define RCC_CFGR_HPRE_DIV2                  0x00000080        // SYSCLK divided by 2
+#define RCC_CFGR_HPRE_DIV4                  0x00000090        // SYSCLK divided by 4
+#define RCC_CFGR_HPRE_DIV8                  0x000000A0        // SYSCLK divided by 8
+#define RCC_CFGR_HPRE_DIV16                 0x000000B0        // SYSCLK divided by 16
+#define RCC_CFGR_HPRE_DIV64                 0x000000C0        // SYSCLK divided by 64
+#define RCC_CFGR_HPRE_DIV128                0x000000D0        // SYSCLK divided by 128
+#define RCC_CFGR_HPRE_DIV256                0x000000E0        // SYSCLK divided by 256
+#define RCC_CFGR_HPRE_DIV512                0x000000F0        // SYSCLK divided by 512
+
+#define RCC_CFGR_PPRE1                      0x00000700        // PRE1[2:0] bits (APB1 prescaler)
+
+// PPRE1 configuration
+#define RCC_CFGR_PPRE1_DIV1                 0x00000000        // HCLK not divided
+#define RCC_CFGR_PPRE1_DIV2                 0x00000400        // HCLK divided by 2
+#define RCC_CFGR_PPRE1_DIV4                 0x00000500        // HCLK divided by 4
+#define RCC_CFGR_PPRE1_DIV8                 0x00000600        // HCLK divided by 8
+#define RCC_CFGR_PPRE1_DIV16                0x00000700        // HCLK divided by 16
+
+#define RCC_CFGR_PPRE2                      0x00003800        // PRE2[2:0] bits (APB2 prescaler)
+
+// PPRE2 configuration
+#define RCC_CFGR_PPRE2_DIV1                 0x00000000        // HCLK not divided
+#define RCC_CFGR_PPRE2_DIV2                 0x00002000        // HCLK divided by 2
+#define RCC_CFGR_PPRE2_DIV4                 0x00002800        // HCLK divided by 4
+#define RCC_CFGR_PPRE2_DIV8                 0x00003000        // HCLK divided by 8
+#define RCC_CFGR_PPRE2_DIV16                0x00003800        // HCLK divided by 16
+
+// PLL entry clock source
+#define RCC_CFGR_PLLSRC                     0x00010000        // PLL entry clock source
+
+#define RCC_CFGR_PLLSRC_HSI                 0x00000000        // HSI as PLL entry clock source
+#define RCC_CFGR_PLLSRC_HSE                 0x00010000        // HSE as PLL entry clock source
+
+
+#define RCC_CFGR_PLLMUL                     0x003C0000        // PLLMUL[3:0] bits (PLL multiplication factor)
+
+// PLLMUL configuration
+#define RCC_CFGR_PLLMUL3                    0x00000000        // PLL input clock * 3
+#define RCC_CFGR_PLLMUL4                    0x00040000        // PLL input clock * 4
+#define RCC_CFGR_PLLMUL6                    0x00080000        // PLL input clock * 6
+#define RCC_CFGR_PLLMUL8                    0x000C0000        // PLL input clock * 8
+#define RCC_CFGR_PLLMUL12                   0x00100000        // PLL input clock * 12
+#define RCC_CFGR_PLLMUL16                   0x00140000        // PLL input clock * 16
+#define RCC_CFGR_PLLMUL24                   0x00180000        // PLL input clock * 24
+#define RCC_CFGR_PLLMUL32                   0x001C0000        // PLL input clock * 32
+#define RCC_CFGR_PLLMUL48                   0x00200000        // PLL input clock * 48
+
+// PLLDIV configuration
+#define RCC_CFGR_PLLDIV                     0x00C00000        // PLLDIV[1:0] bits (PLL Output Division)
+
+// PLLDIV configuration
+#define RCC_CFGR_PLLDIV1                    0x00000000        // PLL clock output = CKVCO / 1
+#define RCC_CFGR_PLLDIV2                    0x00400000        // PLL clock output = CKVCO / 2
+#define RCC_CFGR_PLLDIV3                    0x00800000        // PLL clock output = CKVCO / 3
+#define RCC_CFGR_PLLDIV4                    0x00C00000        // PLL clock output = CKVCO / 4
+
+
+#define RCC_CFGR_MCOSEL                     0x07000000        // MCO[2:0] bits (Microcontroller Clock Output)
+
+// MCO configuration
+#define RCC_CFGR_MCO_NOCLOCK                0x00000000        // No clock
+#define RCC_CFGR_MCO_SYSCLK                 0x01000000        // System clock selected
+#define RCC_CFGR_MCO_HSI                    0x02000000        // Internal 16 MHz RC oscillator clock selected
+#define RCC_CFGR_MCO_MSI                    0x03000000        // Internal Medium Speed RC oscillator clock selected
+#define RCC_CFGR_MCO_HSE                    0x04000000        // External 1-25 MHz oscillator clock selected
+#define RCC_CFGR_MCO_PLL                    0x05000000        // PLL clock divided
+#define RCC_CFGR_MCO_LSI                    0x06000000        // LSI selected
+#define RCC_CFGR_MCO_LSE                    0x07000000        // LSE selected
+
+#define RCC_CFGR_MCOPRE                     0x70000000        // MCOPRE[2:0] bits (Microcontroller Clock Output Prescaler)
+
+// MCO Prescaler configuration
+#define RCC_CFGR_MCO_DIV1                   0x00000000        // MCO Clock divided by 1
+#define RCC_CFGR_MCO_DIV2                   0x10000000        // MCO Clock divided by 2
+#define RCC_CFGR_MCO_DIV4                   0x20000000        // MCO Clock divided by 4
+#define RCC_CFGR_MCO_DIV8                   0x30000000        // MCO Clock divided by 8
+#define RCC_CFGR_MCO_DIV16                  0x40000000        // MCO Clock divided by 16
+
+// ******************  Bit definition for RCC_CIR register  *******************
+#define RCC_CIR_LSIRDYF                     0x00000001        // LSI Ready Interrupt flag
+#define RCC_CIR_LSERDYF                     0x00000002        // LSE Ready Interrupt flag
+#define RCC_CIR_HSIRDYF                     0x00000004        // HSI Ready Interrupt flag
+#define RCC_CIR_HSERDYF                     0x00000008        // HSE Ready Interrupt flag
+#define RCC_CIR_PLLRDYF                     0x00000010        // PLL Ready Interrupt flag
+#define RCC_CIR_MSIRDYF                     0x00000020        // MSI Ready Interrupt flag
+#define RCC_CIR_LSECSS                      0x00000040        // LSE CSS Interrupt flag
+#define RCC_CIR_CSSF                        0x00000080        // Clock Security System Interrupt flag
+
+#define RCC_CIR_LSIRDYIE                    0x00000100        // LSI Ready Interrupt Enable
+#define RCC_CIR_LSERDYIE                    0x00000200        // LSE Ready Interrupt Enable
+#define RCC_CIR_HSIRDYIE                    0x00000400        // HSI Ready Interrupt Enable
+#define RCC_CIR_HSERDYIE                    0x00000800        // HSE Ready Interrupt Enable
+#define RCC_CIR_PLLRDYIE                    0x00001000        // PLL Ready Interrupt Enable
+#define RCC_CIR_MSIRDYIE                    0x00002000        // MSI Ready Interrupt Enable
+#define RCC_CIR_LSECSSIE                    0x00004000        // LSE CSS Interrupt Enable
+
+#define RCC_CIR_LSIRDYC                     0x00010000        // LSI Ready Interrupt Clear
+#define RCC_CIR_LSERDYC                     0x00020000        // LSE Ready Interrupt Clear
+#define RCC_CIR_HSIRDYC                     0x00040000        // HSI Ready Interrupt Clear
+#define RCC_CIR_HSERDYC                     0x00080000        // HSE Ready Interrupt Clear
+#define RCC_CIR_PLLRDYC                     0x00100000        // PLL Ready Interrupt Clear
+#define RCC_CIR_MSIRDYC                     0x00200000        // MSI Ready Interrupt Clear
+#define RCC_CIR_LSECSSC                     0x00400000        // LSE CSS Interrupt Clear
+#define RCC_CIR_CSSC                        0x00800000        // Clock Security System Interrupt Clear
+
+
+//****************  Bit definition for RCC_AHBRSTR register  *****************
+#define RCC_AHBRSTR_GPIOARST                0x00000001        // GPIO port A reset
+#define RCC_AHBRSTR_GPIOBRST                0x00000002        // GPIO port B reset
+#define RCC_AHBRSTR_GPIOCRST                0x00000004        // GPIO port C reset
+#define RCC_AHBRSTR_GPIODRST                0x00000008        // GPIO port D reset
+#define RCC_AHBRSTR_GPIOERST                0x00000010        // GPIO port E reset
+#define RCC_AHBRSTR_GPIOHRST                0x00000020        // GPIO port H reset
+#define RCC_AHBRSTR_GPIOFRST                0x00000040        // GPIO port F reset
+#define RCC_AHBRSTR_GPIOGRST                0x00000080        // GPIO port G reset
+#define RCC_AHBRSTR_CRCRST                  0x00001000        // CRC reset
+#define RCC_AHBRSTR_FLITFRST                0x00008000        // FLITF reset
+#define RCC_AHBRSTR_DMA1RST                 0x01000000        // DMA1 reset
+#define RCC_AHBRSTR_DMA2RST                 0x02000000        // DMA2 reset
+#define RCC_AHBRSTR_AESRST                  0x08000000        // AES reset
+#define RCC_AHBRSTR_FSMCRST                 0x40000000        // FSMC reset
+
+//****************  Bit definition for RCC_APB2RSTR register  ****************
+#define RCC_APB2RSTR_SYSCFGRST              0x00000001        // System Configuration SYSCFG reset
+#define RCC_APB2RSTR_TIM9RST                0x00000004        // TIM9 reset
+#define RCC_APB2RSTR_TIM10RST               0x00000008        // TIM10 reset
+#define RCC_APB2RSTR_TIM11RST               0x00000010        // TIM11 reset
+#define RCC_APB2RSTR_ADC1RST                0x00000200        // ADC1 reset
+#define RCC_APB2RSTR_SDIORST                0x00000800        // SDIO reset
+#define RCC_APB2RSTR_SPI1RST                0x00001000        // SPI1 reset
+#define RCC_APB2RSTR_USART1RST              0x00004000        // USART1 reset
+
+//****************  Bit definition for RCC_APB1RSTR register  ****************
+#define RCC_APB1RSTR_TIM2RST                0x00000001        // Timer 2 reset
+#define RCC_APB1RSTR_TIM3RST                0x00000002        // Timer 3 reset
+#define RCC_APB1RSTR_TIM4RST                0x00000004        // Timer 4 reset
+#define RCC_APB1RSTR_TIM5RST                0x00000008        // Timer 5 reset
+#define RCC_APB1RSTR_TIM6RST                0x00000010        // Timer 6 reset
+#define RCC_APB1RSTR_TIM7RST                0x00000020        // Timer 7 reset
+#define RCC_APB1RSTR_LCDRST                 0x00000200        // LCD reset
+#define RCC_APB1RSTR_WWDGRST                0x00000800        // Window Watchdog reset
+#define RCC_APB1RSTR_SPI2RST                0x00004000        // SPI 2 reset
+#define RCC_APB1RSTR_SPI3RST                0x00008000        // SPI 3 reset
+#define RCC_APB1RSTR_USART2RST              0x00020000        // USART 2 reset
+#define RCC_APB1RSTR_USART3RST              0x00040000        // USART 3 reset
+#define RCC_APB1RSTR_UART4RST               0x00080000        // UART 4 reset
+#define RCC_APB1RSTR_UART5RST               0x00100000        // UART 5 reset
+#define RCC_APB1RSTR_I2C1RST                0x00200000        // I2C 1 reset
+#define RCC_APB1RSTR_I2C2RST                0x00400000        // I2C 2 reset
+#define RCC_APB1RSTR_USBRST                 0x00800000        // USB reset
+#define RCC_APB1RSTR_PWRRST                 0x10000000        // Power interface reset
+#define RCC_APB1RSTR_DACRST                 0x20000000        // DAC interface reset
+#define RCC_APB1RSTR_COMPRST                0x80000000        // Comparator interface reset
+
+//*****************  Bit definition for RCC_AHBENR register  *****************
+#define RCC_AHBENR_GPIOAEN                  0x00000001        // GPIO port A clock enable
+#define RCC_AHBENR_GPIOBEN                  0x00000002        // GPIO port B clock enable
+#define RCC_AHBENR_GPIOCEN                  0x00000004        // GPIO port C clock enable
+#define RCC_AHBENR_GPIODEN                  0x00000008        // GPIO port D clock enable
+#define RCC_AHBENR_GPIOEEN                  0x00000010        // GPIO port E clock enable
+#define RCC_AHBENR_GPIOHEN                  0x00000020        // GPIO port H clock enable
+#define RCC_AHBENR_GPIOFEN                  0x00000040        // GPIO port F clock enable
+#define RCC_AHBENR_GPIOGEN                  0x00000080        // GPIO port G clock enable
+#define RCC_AHBENR_CRCEN                    0x00001000        // CRC clock enable
+#define RCC_AHBENR_FLITFEN                  0x00008000        // FLITF clock enable (has effect only when the Flash memory is in power down mode)
+#define RCC_AHBENR_DMA1EN                   0x01000000        // DMA1 clock enable
+#define RCC_AHBENR_DMA2EN                   0x02000000        // DMA2 clock enable
+#define RCC_AHBENR_AESEN                    0x08000000        // AES clock enable
+#define RCC_AHBENR_FSMCEN                   0x40000000        // FSMC clock enable
+
+
+//*****************  Bit definition for RCC_APB2ENR register  ****************
+#define RCC_APB2ENR_SYSCFGEN                0x00000001         // System Configuration SYSCFG clock enable
+#define RCC_APB2ENR_TIM9EN                  0x00000004         // TIM9 interface clock enable
+#define RCC_APB2ENR_TIM10EN                 0x00000008         // TIM10 interface clock enable
+#define RCC_APB2ENR_TIM11EN                 0x00000010         // TIM11 Timer clock enable
+#define RCC_APB2ENR_ADC1EN                  0x00000200         // ADC1 clock enable
+#define RCC_APB2ENR_SDIOEN                  0x00000800         // SDIO clock enable
+#define RCC_APB2ENR_SPI1EN                  0x00001000         // SPI1 clock enable
+#define RCC_APB2ENR_USART1EN                0x00004000         // USART1 clock enable
+
+
+//****************  Bit definition for RCC_APB1ENR register  *****************
+#define RCC_APB1ENR_TIM2EN                  0x00000001        // Timer 2 clock enabled
+#define RCC_APB1ENR_TIM3EN                  0x00000002        // Timer 3 clock enable
+#define RCC_APB1ENR_TIM4EN                  0x00000004        // Timer 4 clock enable
+#define RCC_APB1ENR_TIM5EN                  0x00000008        // Timer 5 clock enable
+#define RCC_APB1ENR_TIM6EN                  0x00000010        // Timer 6 clock enable
+#define RCC_APB1ENR_TIM7EN                  0x00000020        // Timer 7 clock enable
+#define RCC_APB1ENR_LCDEN                   0x00000200        // LCD clock enable
+#define RCC_APB1ENR_WWDGEN                  0x00000800        // Window Watchdog clock enable
+#define RCC_APB1ENR_SPI2EN                  0x00004000        // SPI 2 clock enable
+#define RCC_APB1ENR_SPI3EN                  0x00008000        // SPI 3 clock enable
+#define RCC_APB1ENR_USART2EN                0x00020000        // USART 2 clock enable
+#define RCC_APB1ENR_USART3EN                0x00040000        // USART 3 clock enable
+#define RCC_APB1ENR_UART4EN                 0x00080000        // UART 4 clock enable
+#define RCC_APB1ENR_UART5EN                 0x00100000        // UART 5 clock enable
+#define RCC_APB1ENR_I2C1EN                  0x00200000        // I2C 1 clock enable
+#define RCC_APB1ENR_I2C2EN                  0x00400000        // I2C 2 clock enable
+#define RCC_APB1ENR_USBEN                   0x00800000        // USB clock enable
+#define RCC_APB1ENR_PWREN                   0x10000000        // Power interface clock enable
+#define RCC_APB1ENR_DACEN                   0x20000000        // DAC interface clock enable
+#define RCC_APB1ENR_COMPEN                  0x80000000        // Comparator interface clock enable
+
+//*****************  Bit definition for RCC_AHBLPENR register  ***************
+#define RCC_AHBLPENR_GPIOALPEN              0x00000001        // GPIO port A clock enabled in sleep mode
+#define RCC_AHBLPENR_GPIOBLPEN              0x00000002        // GPIO port B clock enabled in sleep mode
+#define RCC_AHBLPENR_GPIOCLPEN              0x00000004        // GPIO port C clock enabled in sleep mode
+#define RCC_AHBLPENR_GPIODLPEN              0x00000008        // GPIO port D clock enabled in sleep mode
+#define RCC_AHBLPENR_GPIOELPEN              0x00000010        // GPIO port E clock enabled in sleep mode
+#define RCC_AHBLPENR_GPIOHLPEN              0x00000020        // GPIO port H clock enabled in sleep mode
+#define RCC_AHBLPENR_GPIOFLPEN              0x00000040        // GPIO port F clock enabled in sleep mode
+#define RCC_AHBLPENR_GPIOGLPEN              0x00000080        // GPIO port G clock enabled in sleep mode
+#define RCC_AHBLPENR_CRCLPEN                0x00001000        // CRC clock enabled in sleep mode
+#define RCC_AHBLPENR_FLITFLPEN              0x00008000        // Flash Interface clock enabled in sleep mode (has effect only when the Flash memory is in power down mode)
+#define RCC_AHBLPENR_SRAMLPEN               0x00010000        // SRAM clock enabled in sleep mode
+#define RCC_AHBLPENR_DMA1LPEN               0x01000000        // DMA1 clock enabled in sleep mode
+#define RCC_AHBLPENR_DMA2LPEN               0x02000000        // DMA2 clock enabled in sleep mode
+#define RCC_AHBLPENR_AESLPEN                0x08000000        // AES clock enabled in sleep mode
+#define RCC_AHBLPENR_FSMCLPEN               0x40000000        // FSMC clock enabled in sleep mode
+
+//*****************  Bit definition for RCC_APB2LPENR register  **************
+#define RCC_APB2LPENR_SYSCFGLPEN            0x00000001         // System Configuration SYSCFG clock enabled in sleep mode
+#define RCC_APB2LPENR_TIM9LPEN              0x00000004         // TIM9 interface clock enabled in sleep mode
+#define RCC_APB2LPENR_TIM10LPEN             0x00000008         // TIM10 interface clock enabled in sleep mode
+#define RCC_APB2LPENR_TIM11LPEN             0x00000010         // TIM11 Timer clock enabled in sleep mode
+#define RCC_APB2LPENR_ADC1LPEN              0x00000200         // ADC1 clock enabled in sleep mode
+#define RCC_APB2LPENR_SDIOLPEN              0x00000800         // SDIO clock enabled in sleep mode
+#define RCC_APB2LPENR_SPI1LPEN              0x00001000         // SPI1 clock enabled in sleep mode
+#define RCC_APB2LPENR_USART1LPEN            0x00004000         // USART1 clock enabled in sleep mode
+
+//****************  Bit definition for RCC_APB1LPENR register  ***************
+#define RCC_APB1LPENR_TIM2LPEN              0x00000001        // Timer 2 clock enabled in sleep mode
+#define RCC_APB1LPENR_TIM3LPEN              0x00000002        // Timer 3 clock enabled in sleep mode
+#define RCC_APB1LPENR_TIM4LPEN              0x00000004        // Timer 4 clock enabled in sleep mode
+#define RCC_APB1LPENR_TIM5LPEN              0x00000008        // Timer 5 clock enabled in sleep mode
+#define RCC_APB1LPENR_TIM6LPEN              0x00000010        // Timer 6 clock enabled in sleep mode
+#define RCC_APB1LPENR_TIM7LPEN              0x00000020        // Timer 7 clock enabled in sleep mode
+#define RCC_APB1LPENR_LCDLPEN               0x00000200        // LCD clock enabled in sleep mode
+#define RCC_APB1LPENR_WWDGLPEN              0x00000800        // Window Watchdog clock enabled in sleep mode
+#define RCC_APB1LPENR_SPI2LPEN              0x00004000        // SPI 2 clock enabled in sleep mode
+#define RCC_APB1LPENR_SPI3LPEN              0x00008000        // SPI 3 clock enabled in sleep mode
+#define RCC_APB1LPENR_USART2LPEN            0x00020000        // USART 2 clock enabled in sleep mode
+#define RCC_APB1LPENR_USART3LPEN            0x00040000        // USART 3 clock enabled in sleep mode
+#define RCC_APB1LPENR_UART4LPEN             0x00080000        // UART 4 clock enabled in sleep mode
+#define RCC_APB1LPENR_UART5LPEN             0x00100000        // UART 5 clock enabled in sleep mode
+#define RCC_APB1LPENR_I2C1LPEN              0x00200000        // I2C 1 clock enabled in sleep mode
+#define RCC_APB1LPENR_I2C2LPEN              0x00400000        // I2C 2 clock enabled in sleep mode
+#define RCC_APB1LPENR_USBLPEN               0x00800000        // USB clock enabled in sleep mode
+#define RCC_APB1LPENR_PWRLPEN               0x10000000        // Power interface clock enabled in sleep mode
+#define RCC_APB1LPENR_DACLPEN               0x20000000        // DAC interface clock enabled in sleep mode
+#define RCC_APB1LPENR_COMPLPEN              0x80000000        // Comparator interface clock enabled in sleep mode
+
+//******************  Bit definition for RCC_CSR register  *******************
+#define RCC_CSR_LSION                      0x00000001        // Internal Low Speed oscillator enable
+#define RCC_CSR_LSIRDY                     0x00000002        // Internal Low Speed oscillator Ready
+
+#define RCC_CSR_LSEON                      0x00000100        // External Low Speed oscillator enable
+#define RCC_CSR_LSERDY                     0x00000200        // External Low Speed oscillator Ready
+#define RCC_CSR_LSEBYP                     0x00000400        // External Low Speed oscillator Bypass
+#define RCC_CSR_LSECSSON                   0x00000800        // External Low Speed oscillator CSS Enable
+#define RCC_CSR_LSECSSD                    0x00001000        // External Low Speed oscillator CSS Detected
+
+#define RCC_CSR_RTCSEL                     0x00030000        // RTCSEL[1:0] bits (RTC clock source selection)
+#define RCC_CSR_RTCSEL_0                   0x00010000        // Bit 0
+#define RCC_CSR_RTCSEL_1                   0x00020000        // Bit 1
+
+// RTC congiguration
+#define RCC_CSR_RTCSEL_NOCLOCK             0x00000000        // No clock
+#define RCC_CSR_RTCSEL_LSE                 0x00010000        // LSE oscillator clock used as RTC clock
+#define RCC_CSR_RTCSEL_LSI                 0x00020000        // LSI oscillator clock used as RTC clock
+#define RCC_CSR_RTCSEL_HSE                 0x00030000        // HSE oscillator clock divided by 2, 4, 8 or 16 by RTCPRE used as RTC clock
+
+#define RCC_CSR_RTCEN                      0x00400000        // RTC clock enable
+#define RCC_CSR_RTCRST                     0x00800000        // RTC reset
+
+#define RCC_CSR_RMVF                       0x01000000        // Remove reset flag
+#define RCC_CSR_OBLRSTF                    0x02000000        // Option Bytes Loader reset flag
+#define RCC_CSR_PINRSTF                    0x04000000        // PIN reset flag
+#define RCC_CSR_PORRSTF                    0x08000000        // POR/PDR reset flag
+#define RCC_CSR_SFTRSTF                    0x10000000        // Software Reset flag
+#define RCC_CSR_IWDGRSTF                   0x20000000        // Independent Watchdog reset flag
+#define RCC_CSR_WWDGRSTF                   0x40000000        // Window watchdog reset flag
+#define RCC_CSR_LPWRRSTF                   0x80000000        // Low-Power reset flag
--- a/lib/defs_systick.h
+++ b/lib/defs_systick.h
@ -0,0 +1,57 @@
+#pragma once
+
+#include "common.h"
+
+// AUTHOR : Ondrej Hruska
+// DATE   : 12/2015
+// DESCR  : Control registers and bit masks for SysTick
+
+
+//****************************************************************************
+//*
+//*                               REGISTERS
+//*
+//****************************************************************************
+
+
+#define SysTick_CSR           MMIO32(_SCS_BASE + 0x010)        // (R/W) SysTick Control and Status Register
+#define SysTick_RELOAD        MMIO32(_SCS_BASE + 0x014)        // (R/W) SysTick Reload Value Register
+#define SysTick_VAL           MMIO32(_SCS_BASE + 0x018)        // (R/W) SysTick Current Value Register
+#define SysTick_CALIB         MMIO32(_SCS_BASE + 0x01C)        // (R/ ) SysTick Calibration Value Register
+
+
+
+//****************************************************************************
+//*
+//*                       BIT MASKS AND DEFINITIONS
+//*
+//****************************************************************************
+
+
+//****************  Bit definition for SysTick_CSR register  ****************
+
+#define SysTick_CSR_ENABLE                 0x00000001    // Counter enable
+#define SysTick_CSR_TICKINT                0x00000002    // Enable interrupt when counter reaches zero
+#define SysTick_CSR_CLKSOURCE              0x00000004    // Clock source (0 - external, 1 - core clock)
+
+#define SysTick_CSR_CLKSOURCE_CORE         0x00000004    // Clock source - core clock
+#define SysTick_CSR_CLKSOURCE_DIV8         0x00000000    // Clock source - core clock / 8
+
+#define SysTick_CSR_COUNTFLAG              0x00010000    // Count Flag (only if interrupt is disabled)
+
+
+//****************  Bit definition for SysTick_LOAD register  ****************
+
+#define SysTick_RELOAD_MASK                0x00FFFFFF    // Reload value used when the counter reaches 0
+
+
+//****************  Bit definition for SysTick_VAL register  *****************
+
+#define SysTick_VAL_MASK                   0x00FFFFFF    // Current value at the time the register is accessed
+
+
+//****************  Bit definition for SysTick_CALIB register  ***************
+
+#define SysTick_CALIB_TENMS                0x00FFFFFF    // Reload value to use for 10ms timing
+#define SysTick_CALIB_SKEW                 0x40000000    // Calibration value is not exactly 10 ms
+#define SysTick_CALIB_NOREF                0x80000000    // The reference clock is not provided
--- a/lib/defs_usart.h
+++ b/lib/defs_usart.h
@ -0,0 +1,149 @@
+// AUTHOR : Ondrej Hruska
+// DATE   : 12/2015
+// DESCR  : Control registers and bit masks for USART
+//
+//      Universal Synchronous Asynchronous Receiver Transmitter (USART)
+
+
+//****************************************************************************
+//*
+//*                               REGISTERS
+//*
+//****************************************************************************
+
+// USART 1
+
+#define USART1_SR           MMIO32(_USART1 + 0x00) // USART1 Status register,
+#define USART1_DR           MMIO32(_USART1 + 0x04) // USART1 Data register,
+#define USART1_BRR          MMIO32(_USART1 + 0x08) // USART1 Baud rate register,
+#define USART1_CR1          MMIO32(_USART1 + 0x0C) // USART1 Control register 1,
+#define USART1_CR2          MMIO32(_USART1 + 0x10) // USART1 Control register 2,
+#define USART1_CR3          MMIO32(_USART1 + 0x14) // USART1 Control register 3,
+#define USART1_GTPR         MMIO32(_USART1 + 0x18) // USART1 Guard time and prescaler register,
+
+// USART 2
+
+#define USART2_SR         MMIO32(_USART2 + 0x00) // USART2 Status register,
+#define USART2_DR         MMIO32(_USART2 + 0x04) // USART2 Data register,
+#define USART2_BRR        MMIO32(_USART2 + 0x08) // USART2 Baud rate register,
+#define USART2_CR1        MMIO32(_USART2 + 0x0C) // USART2 Control register 1,
+#define USART2_CR2        MMIO32(_USART2 + 0x10) // USART2 Control register 2,
+#define USART2_CR3        MMIO32(_USART2 + 0x14) // USART2 Control register 3,
+#define USART2_GTPR       MMIO32(_USART2 + 0x18) // USART2 Guard time and prescaler register,
+
+// USART 3
+
+#define USART3_SR         MMIO32(_USART3 + 0x00) // USART3 Status register,
+#define USART3_DR         MMIO32(_USART3 + 0x04) // USART3 Data register,
+#define USART3_BRR        MMIO32(_USART3 + 0x08) // USART3 Baud rate register,
+#define USART3_CR1        MMIO32(_USART3 + 0x0C) // USART3 Control register 1,
+#define USART3_CR2        MMIO32(_USART3 + 0x10) // USART3 Control register 2,
+#define USART3_CR3        MMIO32(_USART3 + 0x14) // USART3 Control register 3,
+#define USART3_GTPR       MMIO32(_USART3 + 0x18) // USART3 Guard time and prescaler register,
+
+// USART 4
+
+#define UART4_SR          MMIO32(_UART4 + 0x00) // UART4 Status register,
+#define UART4_DR          MMIO32(_UART4 + 0x04) // UART4 Data register,
+#define UART4_BRR         MMIO32(_UART4 + 0x08) // UART4 Baud rate register,
+#define UART4_CR1         MMIO32(_UART4 + 0x0C) // UART4 Control register 1,
+#define UART4_CR2         MMIO32(_UART4 + 0x10) // UART4 Control register 2,
+#define UART4_CR3         MMIO32(_UART4 + 0x14) // UART4 Control register 3,
+#define UART4_GTPR        MMIO32(_UART4 + 0x18) // UART4 Guard time and prescaler register,
+
+// USART 5
+
+#define UART5_SR          MMIO32(_UART5 + 0x00) // UART5 Status register,
+#define UART5_DR          MMIO32(_UART5 + 0x04) // UART5 Data register,
+#define UART5_BRR         MMIO32(_UART5 + 0x08) // UART5 Baud rate register,
+#define UART5_CR1         MMIO32(_UART5 + 0x0C) // UART5 Control register 1,
+#define UART5_CR2         MMIO32(_UART5 + 0x10) // UART5 Control register 2,
+#define UART5_CR3         MMIO32(_UART5 + 0x14) // UART5 Control register 3,
+#define UART5_GTPR        MMIO32(_UART5 + 0x18) // UART5 Guard time and prescaler register,
+
+
+
+//****************************************************************************
+//*
+//*                       BIT MASKS AND DEFINITIONS
+//*
+//****************************************************************************
+
+
+//******************  Bit definition for USART_SR register  ******************
+#define USART_SR_PE                         0x0001            // Parity Error
+#define USART_SR_FE                         0x0002            // Framing Error
+#define USART_SR_NE                         0x0004            // Noise Error Flag
+#define USART_SR_ORE                        0x0008            // OverRun Error
+#define USART_SR_IDLE                       0x0010            // IDLE line detected
+#define USART_SR_RXNE                       0x0020            // Read Data Register Not Empty
+#define USART_SR_TC                         0x0040            // Transmission Complete
+#define USART_SR_TXE                        0x0080            // Transmit Data Register Empty
+#define USART_SR_LBD                        0x0100            // LIN Break Detection Flag
+#define USART_SR_CTS                        0x0200            // CTS Flag
+
+//******************  Bit definition for USART_DR register  ******************
+#define USART_DR_DR                         0x01FF            // Data value
+
+//*****************  Bit definition for USART_BRR register  ******************
+#define USART_BRR_DIV_FRACTION              0x000F            // Fraction of USARTDIV
+#define USART_BRR_DIV_MANTISSA              0xFFF0            // Mantissa of USARTDIV
+
+//*****************  Bit definition for USART_CR1 register  ******************
+#define USART_CR1_SBK                       0x0001            // Send Break
+#define USART_CR1_RWU                       0x0002            // Receiver wakeup
+#define USART_CR1_RE                        0x0004            // Receiver Enable
+#define USART_CR1_TE                        0x0008            // Transmitter Enable
+#define USART_CR1_IDLEIE                    0x0010            // IDLE Interrupt Enable
+#define USART_CR1_RXNEIE                    0x0020            // RXNE Interrupt Enable
+#define USART_CR1_TCIE                      0x0040            // Transmission Complete Interrupt Enable
+#define USART_CR1_TXEIE                     0x0080            // PE Interrupt Enable
+#define USART_CR1_PEIE                      0x0100            // PE Interrupt Enable
+#define USART_CR1_PS                        0x0200            // Parity Selection
+#define USART_CR1_PCE                       0x0400            // Parity Control Enable
+#define USART_CR1_WAKE                      0x0800            // Wakeup method
+#define USART_CR1_M                         0x1000            // Word length
+#define USART_CR1_UE                        0x2000            // USART Enable
+#define USART_CR1_OVER8                     0x8000            // Oversampling by 8-bit mode
+
+//*****************  Bit definition for USART_CR2 register  ******************
+#define USART_CR2_ADD                       0x000F            // Address of the USART node
+#define USART_CR2_LBDL                      0x0020            // LIN Break Detection Length
+#define USART_CR2_LBDIE                     0x0040            // LIN Break Detection Interrupt Enable
+#define USART_CR2_LBCL                      0x0100            // Last Bit Clock pulse
+#define USART_CR2_CPHA                      0x0200            // Clock Phase
+#define USART_CR2_CPOL                      0x0400            // Clock Polarity
+#define USART_CR2_CLKEN                     0x0800            // Clock Enable
+
+#define USART_CR2_STOP                      0x3000            // STOP[1:0] bits (STOP bits)
+#define USART_CR2_STOP_0                    0x1000            // Bit 0
+#define USART_CR2_STOP_1                    0x2000            // Bit 1
+
+#define USART_CR2_LINEN                     0x4000            // LIN mode enable
+
+//*****************  Bit definition for USART_CR3 register  ******************
+#define USART_CR3_EIE                       0x0001            // Error Interrupt Enable
+#define USART_CR3_IREN                      0x0002            // IrDA mode Enable
+#define USART_CR3_IRLP                      0x0004            // IrDA Low-Power
+#define USART_CR3_HDSEL                     0x0008            // Half-Duplex Selection
+#define USART_CR3_NACK                      0x0010            // Smartcard NACK enable
+#define USART_CR3_SCEN                      0x0020            // Smartcard mode enable
+#define USART_CR3_DMAR                      0x0040            // DMA Enable Receiver
+#define USART_CR3_DMAT                      0x0080            // DMA Enable Transmitter
+#define USART_CR3_RTSE                      0x0100            // RTS Enable
+#define USART_CR3_CTSE                      0x0200            // CTS Enable
+#define USART_CR3_CTSIE                     0x0400            // CTS Interrupt Enable
+#define USART_CR3_ONEBIT                    0x0800            // One sample bit method enable
+
+//*****************  Bit definition for USART_GTPR register  *****************
+#define USART_GTPR_PSC                      0x00FF            // PSC[7:0] bits (Prescaler value)
+#define USART_GTPR_PSC_0                    0x0001            // Bit 0
+#define USART_GTPR_PSC_1                    0x0002            // Bit 1
+#define USART_GTPR_PSC_2                    0x0004            // Bit 2
+#define USART_GTPR_PSC_3                    0x0008            // Bit 3
+#define USART_GTPR_PSC_4                    0x0010            // Bit 4
+#define USART_GTPR_PSC_5                    0x0020            // Bit 5
+#define USART_GTPR_PSC_6                    0x0040            // Bit 6
+#define USART_GTPR_PSC_7                    0x0080            // Bit 7
+
+#define USART_GTPR_GT                       0xFF00            // Guard time value
--- a/lib/gpio.c
+++ b/lib/gpio.c
@ -0,0 +1,61 @@
+#include "common.h"
+#include "gpio.h"
+
+static uint32_t rcc_gpio_mask(uint32_t gpio)
+{
+	switch (gpio) {
+		case GPIOA: return RCC_AHBENR_GPIOAEN;
+		case GPIOB: return RCC_AHBENR_GPIOBEN;
+		case GPIOC: return RCC_AHBENR_GPIOCEN;
+		case GPIOD: return RCC_AHBENR_GPIODEN;
+		case GPIOE: return RCC_AHBENR_GPIOEEN;
+		case GPIOF: return RCC_AHBENR_GPIOFEN;
+		case GPIOG: return RCC_AHBENR_GPIOGEN;
+		case GPIOH: return RCC_AHBENR_GPIOHEN;
+		default: return 0;
+	}
+}
+
+
+void gpio_enable(uint32_t gpio)
+{
+	RCC_AHBENR |= rcc_gpio_mask(gpio);
+}
+
+
+void gpio_disable(uint32_t gpio)
+{
+	RCC_AHBENR &= ~rcc_gpio_mask(gpio);
+}
+
+
+void gpio_set_af(uint32_t gpio, uint32_t pins, enum GPIO_AF af)
+{
+	gpio_enable(gpio);
+
+	volatile uint32_t *moder = (uint32_t *) gpio + GPIO_MODER_offs;
+	volatile uint64_t *afr = (uint64_t *) gpio + GPIO_AFR_offs;
+
+	BitFieldLoop(i, m, 16) {
+		if (pins & m) {
+			*moder &= ~(0b11 << i * 2);
+			*moder |= 0b10 << i * 2;
+
+			*afr &= ~(0xF << i * 4);
+			*afr |= af << i * 4;
+		}
+	};
+}
+
+
+void gpio_set_mode(uint32_t gpio, uint32_t pins, enum GPIO_MODE mode)
+{
+	volatile uint32_t *moder = (uint32_t *) gpio + GPIO_MODER_offs;
+
+	BitFieldLoop(i, m, 16) {
+		if (pins & m) {
+			*moder &= ~(0b11 << i * 2);
+			*moder |= mode << i * 2;
+		}
+	};
+}
--- a/lib/gpio.h
+++ b/lib/gpio.h
@ -0,0 +1,60 @@
+#pragma once
+
+#include "common.h"
+
+enum GPIO_MODE {
+	MODER_INPUT = 0,
+	MODER_OUTPUT = 1,
+	MODER_AF = 2,
+	MODER_ANALOG = 3,
+};
+
+enum GPIO_AF {
+	AF0 = 0,
+	AF1 = 1,
+	AF2 = 2,
+	AF3 = 3,
+	AF4 = 4,
+	AF5 = 5,
+	AF6 = 6,
+	AF7 = 7,
+	AF8 = 8,
+	AF9 = 9,
+	AF10 = 10,
+	AF11 = 11,
+	AF12 = 12,
+	AF13 = 13,
+	AF14 = 14,
+	AF15 = 15,
+};
+
+
+/**
+ * Enable GPIO in RCC
+ * @param gpio GPIO base
+ */
+void gpio_enable(uint32_t gpio);
+
+/**
+ * Disable GPIO in RCC
+ * @param gpio GPIO base
+ */
+void gpio_disable(uint32_t gpio);
+
+/**
+ * Set GPIO AF (writes MODER and AFR).
+ * Also enables the port if disabled in RCC.
+ * @param gpio GPIO base
+ * @param pins pins bitmask
+ * @param af alternate function 0..15
+ */
+void gpio_set_af(uint32_t gpio, uint32_t pins, enum GPIO_AF af);
+
+
+/**
+ * Set pins mode (writes MODER)
+ * @param gpio GPIO base
+ * @param pins pins bitmask
+ * @param mode mode to set
+ */
+void gpio_set_mode(uint32_t gpio, uint32_t pins, enum GPIO_MODE mode);
--- a/lib/systick.c
+++ b/lib/systick.c
@ -0,0 +1,20 @@
+#include "systick.h"
+
+void systick_setup(uint32_t prescaller)
+{
+	SysTick_CSR = (SysTick_CSR & ~SysTick_CSR_CLKSOURCE) | SysTick_CSR_CLKSOURCE_CORE;
+	SysTick_RELOAD = prescaller;
+	SysTick_CSR |= SysTick_CSR_TICKINT | SysTick_CSR_ENABLE;
+}
+
+
+void systick_enable(void)
+{
+	SysTick_CSR |= SysTick_CSR_ENABLE;
+}
+
+
+void systick_disable(void)
+{
+	SysTick_CSR &= ~SysTick_CSR_ENABLE;
+}
--- a/lib/systick.h
+++ b/lib/systick.h
@ -0,0 +1,20 @@
+#pragma once
+#include "common.h"
+
+// don't forget to implement the handler:
+// void SysTick_Handler(void)
+
+
+/**
+ * Set up and start systick
+ * @param prescaller divider (eg. for 1ms @ 16MHz: 16000)
+ */
+void systick_setup(uint32_t prescaller);
+
+
+/** Enable (start) systick */
+void systick_enable(void);
+
+
+/** Disable (stop) systick */
+void systick_disable(void);
--- a/main.c
+++ b/main.c
@ -0,0 +1,89 @@
+#include <common.h>
+#include <gpio.h>
+#include <systick.h>
+
+
+static void init_gpios(void)
+{
+	gpio_enable(GPIOA);
+	gpio_enable(GPIOB);
+	gpio_enable(GPIOC);
+
+	gpio_set_mode(GPIOC, BIT8 | BIT9, MODER_OUTPUT);
+}
+
+
+static void init_clock(void)
+{
+	// Flash timing - 64-bit access, pre-fetch, latency = 1
+	FLASH_ACR |= FLASH_ACR_ACC64; // Cannot write both at once
+	FLASH_ACR |= FLASH_ACR_PRFTEN | FLASH_ACR_LATENCY;
+
+	// Power on HSI (runs from MSI on start)
+	RCC_CR |= RCC_CR_HSION;
+
+	// Wait for HSIRDY
+	while (!(RCC_CR & RCC_CR_HSIRDY));
+
+	// Select HSI as the core clock source
+	RCC_CFGR &= ~RCC_CFGR_SW;
+	RCC_CFGR |= RCC_CFGR_SW_HSI;
+}
+
+
+static void init_usart(void)
+{
+	gpio_set_af(GPIOC, BIT10 | BIT11, AF7);
+
+	// USART at C11, C12
+	RCC_APB1ENR |= RCC_APB1ENR_USART3EN;
+
+	// RATE 9600Bd 104.1875 (see datasheet for reference)8.6875
+	// 0x00683 ... 9600
+	USART3_BRR = 0x0008A;  // 115200
+
+	// USART enable
+	USART3_CR1 = USART_CR1_UE | USART_CR1_RE | USART_CR1_TE;
+}
+
+
+/** Called before main() */
+void SystemInit(void)
+{
+	init_clock();
+	systick_setup(16000);
+	init_gpios();
+	init_usart();
+}
+
+
+
+static uint32_t time = 0;
+
+/** IRQ */
+void SysTick_Handler(void)
+{
+	time++;
+	if (time == 500) {
+		time = 0;
+		GPIOC_ODR ^= BIT9;
+	}
+}
+
+
+
+void delay(void)
+{
+	for (int i = 0; i < 100000; i++) {
+		__asm__("nop");
+	}
+}
+
+
+int main(void)
+{
+	while (1) {
+		delay();
+		GPIOC_ODR ^= BIT8;
+	}
+}
--- a/proj.pro
+++ b/proj.pro
@ -0,0 +1,34 @@
+TEMPLATE = app
+CONFIG += console
+CONFIG -= app_bundle
+CONFIG -= qt
+
+INCLUDEPATH += \
+	lib \
+	/usr/arm-none-eabi/include
+
+DEFINES += STM32F3 __ARM_ARCH_7M__ ARM_MATH_CM4
+
+
+DISTFILES += \
+	Makefile \
+    style.astylerc \
+    startup_stm32l100xc.s \
+    stm32l100rc.ld
+
+SOURCES += \
+    main.c \
+    lib/gpio.c \
+    lib/systick.c
+
+HEADERS += \
+    lib/common.h \
+    lib/defs_base.h \
+    lib/defs_flash.h \
+    lib/defs_gpio.h \
+    lib/defs_rcc.h \
+    lib/gpio.h \
+    lib/defs_systick.h \
+    lib/systick.h \
+    lib/defs_usart.h
+
--- a/startup_stm32l100xc.s
+++ b/startup_stm32l100xc.s
@ -0,0 +1,418 @@
+/**
+  ******************************************************************************
+  * @file      startup_stm32l100xc.s
+  * @author    MCD Application Team
+  * @version   V2.1.2
+  * @date      09-October-2015
+  * @brief     STM32L100XC Devices vector table for 
+  *            Atollic toolchain.
+  *            This module performs:
+  *                - Set the initial SP
+  *                - Set the initial PC == Reset_Handler,
+  *                - Set the vector table entries with the exceptions ISR address
+  *                - Configure the clock system
+  *                - Branches to main in the C library (which eventually
+  *                  calls main()).
+  *            After Reset the Cortex-M3 processor is in Thread mode,
+  *            priority is Privileged, and the Stack is set to Main.
+  ******************************************************************************
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+  .syntax unified
+  .cpu cortex-m3
+  .fpu softvfp
+  .thumb
+
+.global g_pfnVectors
+.global Default_Handler
+
+/* start address for the initialization values of the .data section.
+defined in linker script */
+.word _sidata
+/* start address for the .data section. defined in linker script */
+.word _sdata
+/* end address for the .data section. defined in linker script */
+.word _edata
+/* start address for the .bss section. defined in linker script */
+.word _sbss
+/* end address for the .bss section. defined in linker script */
+.word _ebss
+
+.equ  BootRAM, 0xF108F85F
+/**
+ * @brief  This is the code that gets called when the processor first
+ *          starts execution following a reset event. Only the absolutely
+ *          necessary set is performed, after which the application
+ *          supplied main() routine is called.
+ * @param  None
+ * @retval : None
+*/
+
+  .section .text.Reset_Handler
+  .weak Reset_Handler
+  .type Reset_Handler, %function
+Reset_Handler:
+
+/* Copy the data segment initializers from flash to SRAM */
+  movs r1, #0
+  b LoopCopyDataInit
+
+CopyDataInit:
+  ldr r3, =_sidata
+  ldr r3, [r3, r1]
+  str r3, [r0, r1]
+  adds r1, r1, #4
+
+LoopCopyDataInit:
+  ldr r0, =_sdata
+  ldr r3, =_edata
+  adds r2, r0, r1
+  cmp r2, r3
+  bcc CopyDataInit
+  ldr r2, =_sbss
+  b LoopFillZerobss
+/* Zero fill the bss segment. */
+FillZerobss:
+  movs r3, #0
+  str r3, [r2], #4
+
+LoopFillZerobss:
+  ldr r3, = _ebss
+  cmp r2, r3
+  bcc FillZerobss
+
+/* Call the clock system intitialization function.*/
+    bl  SystemInit
+/* Call static constructors */
+    bl __libc_init_array
+/* Call the application's entry point.*/
+  bl main
+  bx lr
+.size Reset_Handler, .-Reset_Handler
+
+/**
+ * @brief  This is the code that gets called when the processor receives an
+ *         unexpected interrupt.  This simply enters an infinite loop, preserving
+ *         the system state for examination by a debugger.
+ *
+ * @param  None
+ * @retval : None
+*/
+    .section .text.Default_Handler,"ax",%progbits
+Default_Handler:
+Infinite_Loop:
+  b Infinite_Loop
+  .size Default_Handler, .-Default_Handler
+/******************************************************************************
+*
+* The minimal vector table for a Cortex M3.  Note that the proper constructs
+* must be placed on this to ensure that it ends up at physical address
+* 0x0000.0000.
+*
+******************************************************************************/
+   .section .isr_vector,"a",%progbits
+  .type g_pfnVectors, %object
+  .size g_pfnVectors, .-g_pfnVectors
+
+
+g_pfnVectors:
+  .word _estack
+  .word Reset_Handler
+  .word NMI_Handler
+  .word HardFault_Handler
+  .word MemManage_Handler
+  .word BusFault_Handler
+  .word UsageFault_Handler
+  .word 0
+  .word 0
+  .word 0
+  .word 0
+  .word SVC_Handler
+  .word DebugMon_Handler
+  .word 0
+  .word PendSV_Handler
+  .word SysTick_Handler
+  .word WWDG_IRQHandler
+  .word PVD_IRQHandler
+  .word TAMPER_STAMP_IRQHandler
+  .word RTC_WKUP_IRQHandler
+  .word FLASH_IRQHandler
+  .word RCC_IRQHandler
+  .word EXTI0_IRQHandler
+  .word EXTI1_IRQHandler
+  .word EXTI2_IRQHandler
+  .word EXTI3_IRQHandler
+  .word EXTI4_IRQHandler
+  .word DMA1_Channel1_IRQHandler
+  .word DMA1_Channel2_IRQHandler
+  .word DMA1_Channel3_IRQHandler
+  .word DMA1_Channel4_IRQHandler
+  .word DMA1_Channel5_IRQHandler
+  .word DMA1_Channel6_IRQHandler
+  .word DMA1_Channel7_IRQHandler
+  .word ADC1_IRQHandler
+  .word USB_HP_IRQHandler
+  .word USB_LP_IRQHandler
+  .word DAC_IRQHandler
+  .word COMP_IRQHandler
+  .word EXTI9_5_IRQHandler
+  .word LCD_IRQHandler
+  .word TIM9_IRQHandler
+  .word TIM10_IRQHandler
+  .word TIM11_IRQHandler
+  .word TIM2_IRQHandler
+  .word TIM3_IRQHandler
+  .word TIM4_IRQHandler
+  .word I2C1_EV_IRQHandler
+  .word I2C1_ER_IRQHandler
+  .word I2C2_EV_IRQHandler
+  .word I2C2_ER_IRQHandler
+  .word SPI1_IRQHandler
+  .word SPI2_IRQHandler
+  .word USART1_IRQHandler
+  .word USART2_IRQHandler
+  .word USART3_IRQHandler
+  .word EXTI15_10_IRQHandler
+  .word RTC_Alarm_IRQHandler
+  .word USB_FS_WKUP_IRQHandler
+  .word TIM6_IRQHandler
+  .word TIM7_IRQHandler
+  .word 0
+  .word 0
+  .word SPI3_IRQHandler
+  .word 0
+  .word 0
+  .word DMA2_Channel1_IRQHandler
+  .word DMA2_Channel2_IRQHandler
+  .word DMA2_Channel3_IRQHandler
+  .word DMA2_Channel4_IRQHandler
+  .word DMA2_Channel5_IRQHandler
+  .word 0
+  .word COMP_ACQ_IRQHandler
+  .word 0
+  .word 0
+  .word 0
+  .word 0
+  .word 0
+  .word BootRAM          /* @0x108. This is for boot in RAM mode for 
+                            STM32L100XC devices. */
+
+/*******************************************************************************
+*
+* Provide weak aliases for each Exception handler to the Default_Handler.
+* As they are weak aliases, any function with the same name will override
+* this definition.
+*
+*******************************************************************************/
+
+  .weak NMI_Handler
+  .thumb_set NMI_Handler,Default_Handler
+
+  .weak HardFault_Handler
+  .thumb_set HardFault_Handler,Default_Handler
+
+  .weak MemManage_Handler
+  .thumb_set MemManage_Handler,Default_Handler
+
+  .weak BusFault_Handler
+  .thumb_set BusFault_Handler,Default_Handler
+
+  .weak UsageFault_Handler
+  .thumb_set UsageFault_Handler,Default_Handler
+
+  .weak SVC_Handler
+  .thumb_set SVC_Handler,Default_Handler
+
+  .weak DebugMon_Handler
+  .thumb_set DebugMon_Handler,Default_Handler
+
+  .weak PendSV_Handler
+  .thumb_set PendSV_Handler,Default_Handler
+
+  .weak SysTick_Handler
+  .thumb_set SysTick_Handler,Default_Handler
+
+  .weak WWDG_IRQHandler
+  .thumb_set WWDG_IRQHandler,Default_Handler
+
+  .weak PVD_IRQHandler
+  .thumb_set PVD_IRQHandler,Default_Handler
+
+  .weak TAMPER_STAMP_IRQHandler
+  .thumb_set TAMPER_STAMP_IRQHandler,Default_Handler
+
+  .weak RTC_WKUP_IRQHandler
+  .thumb_set RTC_WKUP_IRQHandler,Default_Handler
+
+  .weak FLASH_IRQHandler
+  .thumb_set FLASH_IRQHandler,Default_Handler
+
+  .weak RCC_IRQHandler
+  .thumb_set RCC_IRQHandler,Default_Handler
+
+  .weak EXTI0_IRQHandler
+  .thumb_set EXTI0_IRQHandler,Default_Handler
+
+  .weak EXTI1_IRQHandler
+  .thumb_set EXTI1_IRQHandler,Default_Handler
+
+  .weak EXTI2_IRQHandler
+  .thumb_set EXTI2_IRQHandler,Default_Handler
+
+  .weak EXTI3_IRQHandler
+  .thumb_set EXTI3_IRQHandler,Default_Handler
+
+  .weak EXTI4_IRQHandler
+  .thumb_set EXTI4_IRQHandler,Default_Handler
+
+  .weak DMA1_Channel1_IRQHandler
+  .thumb_set DMA1_Channel1_IRQHandler,Default_Handler
+
+  .weak DMA1_Channel2_IRQHandler
+  .thumb_set DMA1_Channel2_IRQHandler,Default_Handler
+
+  .weak DMA1_Channel3_IRQHandler
+  .thumb_set DMA1_Channel3_IRQHandler,Default_Handler
+
+  .weak DMA1_Channel4_IRQHandler
+  .thumb_set DMA1_Channel4_IRQHandler,Default_Handler
+
+  .weak DMA1_Channel5_IRQHandler
+  .thumb_set DMA1_Channel5_IRQHandler,Default_Handler
+
+  .weak DMA1_Channel6_IRQHandler
+  .thumb_set DMA1_Channel6_IRQHandler,Default_Handler
+
+  .weak DMA1_Channel7_IRQHandler
+  .thumb_set DMA1_Channel7_IRQHandler,Default_Handler
+
+  .weak ADC1_IRQHandler
+  .thumb_set ADC1_IRQHandler,Default_Handler
+
+  .weak USB_HP_IRQHandler
+  .thumb_set USB_HP_IRQHandler,Default_Handler
+
+  .weak USB_LP_IRQHandler
+  .thumb_set USB_LP_IRQHandler,Default_Handler
+
+  .weak DAC_IRQHandler
+  .thumb_set DAC_IRQHandler,Default_Handler
+
+  .weak COMP_IRQHandler
+  .thumb_set COMP_IRQHandler,Default_Handler
+
+  .weak EXTI9_5_IRQHandler
+  .thumb_set EXTI9_5_IRQHandler,Default_Handler
+
+  .weak LCD_IRQHandler
+  .thumb_set LCD_IRQHandler,Default_Handler
+
+  .weak TIM9_IRQHandler
+  .thumb_set TIM9_IRQHandler,Default_Handler
+
+  .weak TIM10_IRQHandler
+  .thumb_set TIM10_IRQHandler,Default_Handler
+
+  .weak TIM11_IRQHandler
+  .thumb_set TIM11_IRQHandler,Default_Handler
+
+  .weak TIM2_IRQHandler
+  .thumb_set TIM2_IRQHandler,Default_Handler
+
+  .weak TIM3_IRQHandler
+  .thumb_set TIM3_IRQHandler,Default_Handler
+
+  .weak TIM4_IRQHandler
+  .thumb_set TIM4_IRQHandler,Default_Handler
+
+  .weak I2C1_EV_IRQHandler
+  .thumb_set I2C1_EV_IRQHandler,Default_Handler
+
+  .weak I2C1_ER_IRQHandler
+  .thumb_set I2C1_ER_IRQHandler,Default_Handler
+
+  .weak I2C2_EV_IRQHandler
+  .thumb_set I2C2_EV_IRQHandler,Default_Handler
+
+  .weak I2C2_ER_IRQHandler
+  .thumb_set I2C2_ER_IRQHandler,Default_Handler
+
+  .weak SPI1_IRQHandler
+  .thumb_set SPI1_IRQHandler,Default_Handler
+
+  .weak SPI2_IRQHandler
+  .thumb_set SPI2_IRQHandler,Default_Handler
+
+  .weak USART1_IRQHandler
+  .thumb_set USART1_IRQHandler,Default_Handler
+
+  .weak USART2_IRQHandler
+  .thumb_set USART2_IRQHandler,Default_Handler
+
+  .weak USART3_IRQHandler
+  .thumb_set USART3_IRQHandler,Default_Handler
+
+  .weak EXTI15_10_IRQHandler
+  .thumb_set EXTI15_10_IRQHandler,Default_Handler
+
+  .weak RTC_Alarm_IRQHandler
+  .thumb_set RTC_Alarm_IRQHandler,Default_Handler
+
+  .weak USB_FS_WKUP_IRQHandler
+  .thumb_set USB_FS_WKUP_IRQHandler,Default_Handler
+
+  .weak TIM6_IRQHandler
+  .thumb_set TIM6_IRQHandler,Default_Handler
+
+  .weak TIM7_IRQHandler
+  .thumb_set TIM7_IRQHandler,Default_Handler
+
+  .weak SPI3_IRQHandler
+  .thumb_set SPI3_IRQHandler,Default_Handler
+
+  .weak DMA2_Channel1_IRQHandler
+  .thumb_set DMA2_Channel1_IRQHandler,Default_Handler
+
+  .weak DMA2_Channel2_IRQHandler
+  .thumb_set DMA2_Channel2_IRQHandler,Default_Handler
+
+  .weak DMA2_Channel3_IRQHandler
+  .thumb_set DMA2_Channel3_IRQHandler,Default_Handler
+
+  .weak DMA2_Channel4_IRQHandler
+  .thumb_set DMA2_Channel4_IRQHandler,Default_Handler
+
+  .weak DMA2_Channel5_IRQHandler
+  .thumb_set DMA2_Channel5_IRQHandler,Default_Handler
+
+  .weak COMP_ACQ_IRQHandler
+   .thumb_set COMP_ACQ_IRQHandler,Default_Handler
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+
--- a/stm32l100rc.ld
+++ b/stm32l100rc.ld
@ -0,0 +1,167 @@
+/*
+*****************************************************************************
+**
+**  File        : stm32_flash.ld
+**
+**  Abstract    : Linker script for STM32L100RC Device with
+**                256KByte FLASH, 16KByte RAM
+**
+**                Set heap size, stack size and stack location according
+**                to application requirements.
+**
+**                Set memory bank area and size if external memory is used.
+**
+**  Target      : STMicroelectronics STM32
+**
+**  Environment : Atollic TrueSTUDIO(R)
+**
+**  Distribution: The file is distributed as is, without any warranty
+**                of any kind.
+**
+**  (c)Copyright Atollic AB.
+**  You may use this file as-is or modify it according to the needs of your
+**  project. This file may only be built (assembled or compiled and linked)
+**  using the Atollic TrueSTUDIO(R) product. The use of this file together
+**  with other tools than Atollic TrueSTUDIO(R) is not permitted.
+**
+*****************************************************************************
+*/
+
+/* Entry Point */
+ENTRY(Reset_Handler)
+
+/* Highest address of the user mode stack */
+_estack = 0x20003FFF;    /* end of RAM */
+
+/* Generate a link error if heap and stack don't fit into RAM */
+_Min_Heap_Size = 0x1000;      /* required amount of heap  */
+_Min_Stack_Size = 0x400; /* required amount of stack */
+
+/* Specify the memory areas */
+MEMORY
+{
+  FLASH (rx) : ORIGIN = 0x8000000, LENGTH = 256K
+  RAM (xrw)  : ORIGIN = 0x20000000, LENGTH = 16K
+  EEP (r)    : ORIGIN = 0x08080000, LENGTH = 4K
+}
+
+/* Define output sections */
+SECTIONS
+{
+  /* The startup code goes first into FLASH */
+  .isr_vector :
+  {
+    . = ALIGN(4);
+    KEEP(*(.isr_vector)) /* Startup code */
+    . = ALIGN(4);
+  } >FLASH
+
+  /* The program code and other data goes into FLASH */
+  .text :
+  {
+    . = ALIGN(4);
+    *(.text)           /* .text sections (code) */
+    *(.text*)          /* .text* sections (code) */
+    *(.glue_7)         /* glue arm to thumb code */
+    *(.glue_7t)        /* glue thumb to arm code */
+    *(.eh_frame)
+
+    KEEP (*(.init))
+    KEEP (*(.fini))
+
+    . = ALIGN(4);
+    _etext = .;        /* define a global symbols at end of code */
+  } >FLASH
+
+  /* Constant data goes into FLASH */
+  .rodata :
+  {
+    . = ALIGN(4);
+    *(.rodata)         /* .rodata sections (constants, strings, etc.) */
+    *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
+    . = ALIGN(4);
+  } >FLASH
+
+  .ARM.extab   : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH
+  .ARM : {
+    __exidx_start = .;
+    *(.ARM.exidx*)
+    __exidx_end = .;
+  } >FLASH
+
+  .preinit_array     :
+  {
+    PROVIDE_HIDDEN (__preinit_array_start = .);
+    KEEP (*(.preinit_array*))
+    PROVIDE_HIDDEN (__preinit_array_end = .);
+  } >FLASH
+  .init_array :
+  {
+    PROVIDE_HIDDEN (__init_array_start = .);
+    KEEP (*(SORT(.init_array.*)))
+    KEEP (*(.init_array*))
+    PROVIDE_HIDDEN (__init_array_end = .);
+  } >FLASH
+  .fini_array :
+  {
+    PROVIDE_HIDDEN (__fini_array_start = .);
+    KEEP (*(SORT(.fini_array.*)))
+    KEEP (*(.fini_array*))
+    PROVIDE_HIDDEN (__fini_array_end = .);
+  } >FLASH
+
+  /* used by the startup to initialize data */
+  _sidata = LOADADDR(.data);
+
+  /* Initialized data sections goes into RAM, load LMA copy after code */
+  .data :
+  {
+    . = ALIGN(4);
+    _sdata = .;        /* create a global symbol at data start */
+    *(.data)           /* .data sections */
+    *(.data*)          /* .data* sections */
+
+    . = ALIGN(4);
+    _edata = .;        /* define a global symbol at data end */
+  } >RAM AT> FLASH
+
+
+  /* Uninitialized data section */
+  . = ALIGN(4);
+  .bss :
+  {
+    /* This is used by the startup in order to initialize the .bss secion */
+    _sbss = .;         /* define a global symbol at bss start */
+    __bss_start__ = _sbss;
+    *(.bss)
+    *(.bss*)
+    *(COMMON)
+
+    . = ALIGN(4);
+    _ebss = .;         /* define a global symbol at bss end */
+    __bss_end__ = _ebss;
+  } >RAM
+
+  /* User_heap_stack section, used to check that there is enough RAM left */
+  ._user_heap_stack :
+  {
+    . = ALIGN(4);
+    PROVIDE ( end = . );
+    PROVIDE ( _end = . );
+    . = . + _Min_Heap_Size;
+    . = . + _Min_Stack_Size;
+    . = ALIGN(4);
+  } >RAM
+
+
+
+  /* Remove information from the standard libraries */
+  /DISCARD/ :
+  {
+    libc.a ( * )
+    libm.a ( * )
+    libgcc.a ( * )
+  }
+
+  .ARM.attributes 0 : { *(.ARM.attributes) }
+}
--- a/style.astylerc
+++ b/style.astylerc
@ -0,0 +1,13 @@
+style=kr
+indent=tab
+max-instatement-indent=60
+
+convert-tabs
+
+indent-switches
+
+pad-oper
+unpad-paren
+pad-header
+
+verbose