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usart handler example + nvic code

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master
Ondřej Hruška 10 years ago
parent 6cc83d875c
commit 479b56bee7
11 changed files with 605 additions and 42 deletions
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  1. 2
      Makefile
  2. 8
      blink.c
  3. 4
      blink.h
  4. 31
      init.c
  5. 11
      lib/common.c
  6. 89
      lib/common.h
  7. 388
      lib/defs_nvic.h
  8. 18
      main.c
  9. 8
      proj.pro
  10. 64
      utils/nvic.c
  11. 24
      utils/nvic.h

2
Makefile
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@ -20,8 +20,10 @@ OBJS += utils/gpio.o
OBJS += utils/usart.o
OBJS += utils/timebase.o
OBJS += utils/debounce.o
OBJS += utils/nvic.o
OBJS += init.o
OBJS += blink.o
OBJS += lib/common.o
################################################################

8
blink.c
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@ -9,14 +9,14 @@ void blue_toggle(void) { GPIOC_ODR ^= BIT8; }
void blue_on(void) { GPIOC_ODR |= BIT8; }
void blue_off(void) { GPIOC_ODR &= ~BIT8; }
void blink_green(void)
void green_blink(void)
{
green_on();
schedule_task(green_off, 250);
schedule_task(green_off, 100);
}
void blink_blue(void)
void blue_blink(void)
{
blue_on();
schedule_task(blue_off, 250);
schedule_task(blue_off, 100);
}

4
blink.h
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@ -8,5 +8,5 @@ void blue_toggle(void);
void blue_on(void);
void blue_off(void);
void blink_green(void);
void blink_blue(void);
void green_blink(void);
void blue_blink(void);

31
init.c
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@ -2,6 +2,7 @@
#include "utils/gpio.h"
#include "utils/usart.h"
#include "utils/nvic.h"
void init_gpios(void)
@ -48,6 +49,10 @@ void init_usart(void)
// USART enable
USART3_CR1 = USART_CR1_UE | USART_CR1_RE | USART_CR1_TE;
// enable interrupt on data receive
nvic_enable_irq(NVIC_USART3_IRQ);
USART3_CR1 |= USART_CR1_RXNEIE;
}
@ -64,3 +69,29 @@ void init_adc(void)
{
// TODO
}

11
lib/common.c
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@ -0,0 +1,11 @@
#include "common.h"
__attribute__((always_inline))
inline uint32_t __RBIT(uint32_t value)
{
register uint32_t result;
__asm__ volatile("rbit %0, %1" : "=r"(result) : "r"(value));
return (result);
}

89
lib/common.h
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@ -6,10 +6,10 @@
#include <stdbool.h>
#include <stdlib.h>
// Memory mapped IO pointer types
typedef volatile uint8_t* io8_t;
typedef volatile uint16_t* io16_t;
typedef volatile uint32_t* io32_t ;
typedef volatile uint32_t* io32_t;
typedef volatile uint64_t* io64_t;
/* Generic memory-mapped I/O accessor functions */
@ -25,45 +25,65 @@ typedef volatile uint64_t* io64_t;
#define BBIO_PERIPH(addr, bit) \
MMIO32((((uint32_t)addr) & 0x0FFFFF) * 32 + 0x42000000 + (bit) * 4)
// intrinsics
#define wait_for_interrupt() __asm__("WFI")
#define __CLZ(div) __builtin_clz(div)
#define count_leading_zeros(div) __CLZ(div)
#define __REV(x) __builtin_bswap32(x)
#define reverse_bytes(x) __REV(x)
#define enable_interrupts() __asm__("CPSIE I")
#define disable_interrupts() __asm__("CPSID I");
#define enable_faults() __asm__("CPSIE F");
#define disable_faults() __asm__("CPSID F");
uint32_t __RBIT(uint32_t value); // defined in c file as inline asm
#define reverse_bits(v) __RBIT(v)
// 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++)
// get a peripheral register pointer
#define P_REG(periph_base, reg_offs) ((io32_t) ((periph_base) + (reg_offs)))
#define BIT(x) (1 << (x))
#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)
#define BIT0 BIT(0)
#define BIT1 BIT(1)
#define BIT2 BIT(2)
#define BIT3 BIT(3)
#define BIT4 BIT(4)
#define BIT5 BIT(5)
#define BIT6 BIT(6)
#define BIT7 BIT(7)
#define BIT8 BIT(8)
#define BIT9 BIT(9)
#define BIT10 BIT(10)
#define BIT11 BIT(11)
#define BIT12 BIT(12)
#define BIT13 BIT(13)
#define BIT14 BIT(14)
#define BIT15 BIT(15)
#define BIT16 BIT(16)
#define BIT17 BIT(17)
#define BIT18 BIT(18)
#define BIT19 BIT(19)
#define BIT20 BIT(20)
#define BIT21 BIT(21)
#define BIT22 BIT(22)
#define BIT23 BIT(23)
#define BIT24 BIT(24)
#define BIT25 BIT(25)
#define BIT26 BIT(26)
#define BIT27 BIT(27)
#define BIT28 BIT(28)
#define BIT29 BIT(29)
#define BIT30 BIT(30)
#define BIT31 BIT(31)
@ -79,3 +99,4 @@ typedef volatile uint64_t* io64_t;
#include "defs_i2c.h"
#include "defs_spi.h"
#include "defs_timers.h"
#include "defs_nvic.h"

388
lib/defs_nvic.h
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@ -0,0 +1,388 @@
#pragma once
#include "common.h"
// AUTHOR : Ondrej Hruska
// DATE : 12/2015
// DESCR : Control registers and bit masks for NVIC (interrupt vector controller)
//****************************************************************************
//*
//* REGISTERS
//*
//****************************************************************************
// system handler
#define SCS_SHPR(ipr_id) MMIO8(SCS_BASE + 0xD18 + ipr_id)
#define NVIC_NMI_IRQ -14
#define NVIC_HARD_FAULT_IRQ -13
#define NVIC_MEM_MANAGE_IRQ -12
#define NVIC_BUS_FAULT_IRQ -11
#define NVIC_USAGE_FAULT_IRQ -10
/* irq numbers -6 to -9 are reserved */
#define NVIC_SV_CALL_IRQ -5
#define DEBUG_MONITOR_IRQ -4
/* irq number -3 reserved */
#define NVIC_PENDSV_IRQ -2
#define NVIC_SYSTICK_IRQ -1
// NVIC
#define NVIC_ISER_BASE (NVIC + 0x000)
#define NVIC_ISER0 MMIO32(NVIC + 0x000) // (R/W) Interrupt Set Enable Register
#define NVIC_ISER1 MMIO32(NVIC + 0x004) // (R/W) Interrupt Set Enable Register
#define NVIC_ISER2 MMIO32(NVIC + 0x008) // (R/W) Interrupt Set Enable Register
#define NVIC_ISER3 MMIO32(NVIC + 0x00C) // (R/W) Interrupt Set Enable Register
#define NVIC_ISER4 MMIO32(NVIC + 0x010) // (R/W) Interrupt Set Enable Register
#define NVIC_ISER5 MMIO32(NVIC + 0x014) // (R/W) Interrupt Set Enable Register
#define NVIC_ISER6 MMIO32(NVIC + 0x018) // (R/W) Interrupt Set Enable Register
#define NVIC_ISER7 MMIO32(NVIC + 0x01C) // (R/W) Interrupt Set Enable Register
#define NVIC_ISER8 MMIO32(NVIC + 0x020) // (R/W) Interrupt Set Enable Register
#define NVIC_ICER_BASE (NVIC + 0x080)
#define NVIC_ICER0 MMIO32(NVIC + 0x080) // (R/W) Interrupt Clear Enable Register
#define NVIC_ICER1 MMIO32(NVIC + 0x084) // (R/W) Interrupt Clear Enable Register
#define NVIC_ICER2 MMIO32(NVIC + 0x088) // (R/W) Interrupt Clear Enable Register
#define NVIC_ICER3 MMIO32(NVIC + 0x08C) // (R/W) Interrupt Clear Enable Register
#define NVIC_ICER4 MMIO32(NVIC + 0x090) // (R/W) Interrupt Clear Enable Register
#define NVIC_ICER5 MMIO32(NVIC + 0x094) // (R/W) Interrupt Clear Enable Register
#define NVIC_ICER6 MMIO32(NVIC + 0x098) // (R/W) Interrupt Clear Enable Register
#define NVIC_ICER7 MMIO32(NVIC + 0x09C) // (R/W) Interrupt Clear Enable Register
#define NVIC_ISPR_BASE (NVIC + 0x100)
#define NVIC_ISPR0 MMIO32(NVIC + 0x100) // (R/W) Interrupt Set Pending Register
#define NVIC_ISPR1 MMIO32(NVIC + 0x104) // (R/W) Interrupt Set Pending Register
#define NVIC_ISPR2 MMIO32(NVIC + 0x108) // (R/W) Interrupt Set Pending Register
#define NVIC_ISPR3 MMIO32(NVIC + 0x10C) // (R/W) Interrupt Set Pending Register
#define NVIC_ISPR4 MMIO32(NVIC + 0x110) // (R/W) Interrupt Set Pending Register
#define NVIC_ISPR5 MMIO32(NVIC + 0x114) // (R/W) Interrupt Set Pending Register
#define NVIC_ISPR6 MMIO32(NVIC + 0x118) // (R/W) Interrupt Set Pending Register
#define NVIC_ISPR7 MMIO32(NVIC + 0x11C) // (R/W) Interrupt Set Pending Register
#define NVIC_ICPR_BASE (NVIC + 0x180)
#define NVIC_ICPR0 MMIO32(NVIC + 0x180) // (R/W) Interrupt Clear Pending Register
#define NVIC_ICPR1 MMIO32(NVIC + 0x184) // (R/W) Interrupt Clear Pending Register
#define NVIC_ICPR2 MMIO32(NVIC + 0x188) // (R/W) Interrupt Clear Pending Register
#define NVIC_ICPR3 MMIO32(NVIC + 0x18C) // (R/W) Interrupt Clear Pending Register
#define NVIC_ICPR4 MMIO32(NVIC + 0x190) // (R/W) Interrupt Clear Pending Register
#define NVIC_ICPR5 MMIO32(NVIC + 0x194) // (R/W) Interrupt Clear Pending Register
#define NVIC_ICPR6 MMIO32(NVIC + 0x198) // (R/W) Interrupt Clear Pending Register
#define NVIC_ICPR7 MMIO32(NVIC + 0x19C) // (R/W) Interrupt Clear Pending Register
#define NVIC_IABR_BASE (NVIC + 0x200)
#define NVIC_IABR0 MMIO32(NVIC + 0x200) // (R/W) Interrupt Active bit Register
#define NVIC_IABR1 MMIO32(NVIC + 0x204) // (R/W) Interrupt Active bit Register
#define NVIC_IABR2 MMIO32(NVIC + 0x208) // (R/W) Interrupt Active bit Register
#define NVIC_IABR3 MMIO32(NVIC + 0x20C) // (R/W) Interrupt Active bit Register
#define NVIC_IABR4 MMIO32(NVIC + 0x210) // (R/W) Interrupt Active bit Register
#define NVIC_IABR5 MMIO32(NVIC + 0x214) // (R/W) Interrupt Active bit Register
#define NVIC_IABR6 MMIO32(NVIC + 0x218) // (R/W) Interrupt Active bit Register
#define NVIC_IABR7 MMIO32(NVIC + 0x21C) // (R/W) Interrupt Active bit Register
#define NVIC_IPR_BASE (NVIC + 0x300) // (R/W) Interrupt Priority Register (8Bit wide) +240
#define NVIC_IPR(n) MMIO8(NVIC_IPR_BASE + (n))
#define NVIC_ISER(n) MMIO32(NVIC_ISER_BASE + (n*4))
#define NVIC_ICER(n) MMIO32(NVIC_ICER_BASE + (n*4))
#define NVIC_ISPR(n) MMIO32(NVIC_ISPR_BASE + (n*4))
#define NVIC_ICPR(n) MMIO32(NVIC_ICPR_BASE + (n*4))
#define NVIC_IABR(n) MMIO32(NVIC_IABR_BASE + (n*4))
#define NVIC_STIR MMIO32(NVIC + 0xE00) // ( /W) Software Trigger Interrupt Register
//****************************************************************************
//*
//* BIT MASKS AND DEFINITIONS
//*
//****************************************************************************
//***************** Bit definition for NVIC_ISER register ******************
#define NVIC_ISER_SETENA 0xFFFFFFFF // Interrupt set enable bits
#define NVIC_ISER_SETENA_0 0x00000001 // bit 0
#define NVIC_ISER_SETENA_1 0x00000002 // bit 1
#define NVIC_ISER_SETENA_2 0x00000004 // bit 2
#define NVIC_ISER_SETENA_3 0x00000008 // bit 3
#define NVIC_ISER_SETENA_4 0x00000010 // bit 4
#define NVIC_ISER_SETENA_5 0x00000020 // bit 5
#define NVIC_ISER_SETENA_6 0x00000040 // bit 6
#define NVIC_ISER_SETENA_7 0x00000080 // bit 7
#define NVIC_ISER_SETENA_8 0x00000100 // bit 8
#define NVIC_ISER_SETENA_9 0x00000200 // bit 9
#define NVIC_ISER_SETENA_10 0x00000400 // bit 10
#define NVIC_ISER_SETENA_11 0x00000800 // bit 11
#define NVIC_ISER_SETENA_12 0x00001000 // bit 12
#define NVIC_ISER_SETENA_13 0x00002000 // bit 13
#define NVIC_ISER_SETENA_14 0x00004000 // bit 14
#define NVIC_ISER_SETENA_15 0x00008000 // bit 15
#define NVIC_ISER_SETENA_16 0x00010000 // bit 16
#define NVIC_ISER_SETENA_17 0x00020000 // bit 17
#define NVIC_ISER_SETENA_18 0x00040000 // bit 18
#define NVIC_ISER_SETENA_19 0x00080000 // bit 19
#define NVIC_ISER_SETENA_20 0x00100000 // bit 20
#define NVIC_ISER_SETENA_21 0x00200000 // bit 21
#define NVIC_ISER_SETENA_22 0x00400000 // bit 22
#define NVIC_ISER_SETENA_23 0x00800000 // bit 23
#define NVIC_ISER_SETENA_24 0x01000000 // bit 24
#define NVIC_ISER_SETENA_25 0x02000000 // bit 25
#define NVIC_ISER_SETENA_26 0x04000000 // bit 26
#define NVIC_ISER_SETENA_27 0x08000000 // bit 27
#define NVIC_ISER_SETENA_28 0x10000000 // bit 28
#define NVIC_ISER_SETENA_29 0x20000000 // bit 29
#define NVIC_ISER_SETENA_30 0x40000000 // bit 30
#define NVIC_ISER_SETENA_31 0x80000000 // bit 31
//***************** Bit definition for NVIC_ICER register ******************
#define NVIC_ICER_CLRENA 0xFFFFFFFF // Interrupt clear-enable bits
#define NVIC_ICER_CLRENA_0 0x00000001 // bit 0
#define NVIC_ICER_CLRENA_1 0x00000002 // bit 1
#define NVIC_ICER_CLRENA_2 0x00000004 // bit 2
#define NVIC_ICER_CLRENA_3 0x00000008 // bit 3
#define NVIC_ICER_CLRENA_4 0x00000010 // bit 4
#define NVIC_ICER_CLRENA_5 0x00000020 // bit 5
#define NVIC_ICER_CLRENA_6 0x00000040 // bit 6
#define NVIC_ICER_CLRENA_7 0x00000080 // bit 7
#define NVIC_ICER_CLRENA_8 0x00000100 // bit 8
#define NVIC_ICER_CLRENA_9 0x00000200 // bit 9
#define NVIC_ICER_CLRENA_10 0x00000400 // bit 10
#define NVIC_ICER_CLRENA_11 0x00000800 // bit 11
#define NVIC_ICER_CLRENA_12 0x00001000 // bit 12
#define NVIC_ICER_CLRENA_13 0x00002000 // bit 13
#define NVIC_ICER_CLRENA_14 0x00004000 // bit 14
#define NVIC_ICER_CLRENA_15 0x00008000 // bit 15
#define NVIC_ICER_CLRENA_16 0x00010000 // bit 16
#define NVIC_ICER_CLRENA_17 0x00020000 // bit 17
#define NVIC_ICER_CLRENA_18 0x00040000 // bit 18
#define NVIC_ICER_CLRENA_19 0x00080000 // bit 19
#define NVIC_ICER_CLRENA_20 0x00100000 // bit 20
#define NVIC_ICER_CLRENA_21 0x00200000 // bit 21
#define NVIC_ICER_CLRENA_22 0x00400000 // bit 22
#define NVIC_ICER_CLRENA_23 0x00800000 // bit 23
#define NVIC_ICER_CLRENA_24 0x01000000 // bit 24
#define NVIC_ICER_CLRENA_25 0x02000000 // bit 25
#define NVIC_ICER_CLRENA_26 0x04000000 // bit 26
#define NVIC_ICER_CLRENA_27 0x08000000 // bit 27
#define NVIC_ICER_CLRENA_28 0x10000000 // bit 28
#define NVIC_ICER_CLRENA_29 0x20000000 // bit 29
#define NVIC_ICER_CLRENA_30 0x40000000 // bit 30
#define NVIC_ICER_CLRENA_31 0x80000000 // bit 31
//***************** Bit definition for NVIC_ISPR register ******************
#define NVIC_ISPR_SETPEND 0xFFFFFFFF // Interrupt set-pending bits
#define NVIC_ISPR_SETPEND_0 0x00000001 // bit 0
#define NVIC_ISPR_SETPEND_1 0x00000002 // bit 1
#define NVIC_ISPR_SETPEND_2 0x00000004 // bit 2
#define NVIC_ISPR_SETPEND_3 0x00000008 // bit 3
#define NVIC_ISPR_SETPEND_4 0x00000010 // bit 4
#define NVIC_ISPR_SETPEND_5 0x00000020 // bit 5
#define NVIC_ISPR_SETPEND_6 0x00000040 // bit 6
#define NVIC_ISPR_SETPEND_7 0x00000080 // bit 7
#define NVIC_ISPR_SETPEND_8 0x00000100 // bit 8
#define NVIC_ISPR_SETPEND_9 0x00000200 // bit 9
#define NVIC_ISPR_SETPEND_10 0x00000400 // bit 10
#define NVIC_ISPR_SETPEND_11 0x00000800 // bit 11
#define NVIC_ISPR_SETPEND_12 0x00001000 // bit 12
#define NVIC_ISPR_SETPEND_13 0x00002000 // bit 13
#define NVIC_ISPR_SETPEND_14 0x00004000 // bit 14
#define NVIC_ISPR_SETPEND_15 0x00008000 // bit 15
#define NVIC_ISPR_SETPEND_16 0x00010000 // bit 16
#define NVIC_ISPR_SETPEND_17 0x00020000 // bit 17
#define NVIC_ISPR_SETPEND_18 0x00040000 // bit 18
#define NVIC_ISPR_SETPEND_19 0x00080000 // bit 19
#define NVIC_ISPR_SETPEND_20 0x00100000 // bit 20
#define NVIC_ISPR_SETPEND_21 0x00200000 // bit 21
#define NVIC_ISPR_SETPEND_22 0x00400000 // bit 22
#define NVIC_ISPR_SETPEND_23 0x00800000 // bit 23
#define NVIC_ISPR_SETPEND_24 0x01000000 // bit 24
#define NVIC_ISPR_SETPEND_25 0x02000000 // bit 25
#define NVIC_ISPR_SETPEND_26 0x04000000 // bit 26
#define NVIC_ISPR_SETPEND_27 0x08000000 // bit 27
#define NVIC_ISPR_SETPEND_28 0x10000000 // bit 28
#define NVIC_ISPR_SETPEND_29 0x20000000 // bit 29
#define NVIC_ISPR_SETPEND_30 0x40000000 // bit 30
#define NVIC_ISPR_SETPEND_31 0x80000000 // bit 31
//***************** Bit definition for NVIC_ICPR register ******************
#define NVIC_ICPR_CLRPEND 0xFFFFFFFF // Interrupt clear-pending bits
#define NVIC_ICPR_CLRPEND_0 0x00000001 // bit 0
#define NVIC_ICPR_CLRPEND_1 0x00000002 // bit 1
#define NVIC_ICPR_CLRPEND_2 0x00000004 // bit 2
#define NVIC_ICPR_CLRPEND_3 0x00000008 // bit 3
#define NVIC_ICPR_CLRPEND_4 0x00000010 // bit 4
#define NVIC_ICPR_CLRPEND_5 0x00000020 // bit 5
#define NVIC_ICPR_CLRPEND_6 0x00000040 // bit 6
#define NVIC_ICPR_CLRPEND_7 0x00000080 // bit 7
#define NVIC_ICPR_CLRPEND_8 0x00000100 // bit 8
#define NVIC_ICPR_CLRPEND_9 0x00000200 // bit 9
#define NVIC_ICPR_CLRPEND_10 0x00000400 // bit 10
#define NVIC_ICPR_CLRPEND_11 0x00000800 // bit 11
#define NVIC_ICPR_CLRPEND_12 0x00001000 // bit 12
#define NVIC_ICPR_CLRPEND_13 0x00002000 // bit 13
#define NVIC_ICPR_CLRPEND_14 0x00004000 // bit 14
#define NVIC_ICPR_CLRPEND_15 0x00008000 // bit 15
#define NVIC_ICPR_CLRPEND_16 0x00010000 // bit 16
#define NVIC_ICPR_CLRPEND_17 0x00020000 // bit 17
#define NVIC_ICPR_CLRPEND_18 0x00040000 // bit 18
#define NVIC_ICPR_CLRPEND_19 0x00080000 // bit 19
#define NVIC_ICPR_CLRPEND_20 0x00100000 // bit 20
#define NVIC_ICPR_CLRPEND_21 0x00200000 // bit 21
#define NVIC_ICPR_CLRPEND_22 0x00400000 // bit 22
#define NVIC_ICPR_CLRPEND_23 0x00800000 // bit 23
#define NVIC_ICPR_CLRPEND_24 0x01000000 // bit 24
#define NVIC_ICPR_CLRPEND_25 0x02000000 // bit 25
#define NVIC_ICPR_CLRPEND_26 0x04000000 // bit 26
#define NVIC_ICPR_CLRPEND_27 0x08000000 // bit 27
#define NVIC_ICPR_CLRPEND_28 0x10000000 // bit 28
#define NVIC_ICPR_CLRPEND_29 0x20000000 // bit 29
#define NVIC_ICPR_CLRPEND_30 0x40000000 // bit 30
#define NVIC_ICPR_CLRPEND_31 0x80000000 // bit 31
//***************** Bit definition for NVIC_IABR register ******************
#define NVIC_IABR_ACTIVE 0xFFFFFFFF // Interrupt active flags
#define NVIC_IABR_ACTIVE_0 0x00000001 // bit 0
#define NVIC_IABR_ACTIVE_1 0x00000002 // bit 1
#define NVIC_IABR_ACTIVE_2 0x00000004 // bit 2
#define NVIC_IABR_ACTIVE_3 0x00000008 // bit 3
#define NVIC_IABR_ACTIVE_4 0x00000010 // bit 4
#define NVIC_IABR_ACTIVE_5 0x00000020 // bit 5
#define NVIC_IABR_ACTIVE_6 0x00000040 // bit 6
#define NVIC_IABR_ACTIVE_7 0x00000080 // bit 7
#define NVIC_IABR_ACTIVE_8 0x00000100 // bit 8
#define NVIC_IABR_ACTIVE_9 0x00000200 // bit 9
#define NVIC_IABR_ACTIVE_10 0x00000400 // bit 10
#define NVIC_IABR_ACTIVE_11 0x00000800 // bit 11
#define NVIC_IABR_ACTIVE_12 0x00001000 // bit 12
#define NVIC_IABR_ACTIVE_13 0x00002000 // bit 13
#define NVIC_IABR_ACTIVE_14 0x00004000 // bit 14
#define NVIC_IABR_ACTIVE_15 0x00008000 // bit 15
#define NVIC_IABR_ACTIVE_16 0x00010000 // bit 16
#define NVIC_IABR_ACTIVE_17 0x00020000 // bit 17
#define NVIC_IABR_ACTIVE_18 0x00040000 // bit 18
#define NVIC_IABR_ACTIVE_19 0x00080000 // bit 19
#define NVIC_IABR_ACTIVE_20 0x00100000 // bit 20
#define NVIC_IABR_ACTIVE_21 0x00200000 // bit 21
#define NVIC_IABR_ACTIVE_22 0x00400000 // bit 22
#define NVIC_IABR_ACTIVE_23 0x00800000 // bit 23
#define NVIC_IABR_ACTIVE_24 0x01000000 // bit 24
#define NVIC_IABR_ACTIVE_25 0x02000000 // bit 25
#define NVIC_IABR_ACTIVE_26 0x04000000 // bit 26
#define NVIC_IABR_ACTIVE_27 0x08000000 // bit 27
#define NVIC_IABR_ACTIVE_28 0x10000000 // bit 28
#define NVIC_IABR_ACTIVE_29 0x20000000 // bit 29
#define NVIC_IABR_ACTIVE_30 0x40000000 // bit 30
#define NVIC_IABR_ACTIVE_31 0x80000000 // bit 31
//***************** Bit definition for NVIC_PRI0 register ******************
#define NVIC_IPR0_PRI_0 0x000000FF // Priority of interrupt 0
#define NVIC_IPR0_PRI_1 0x0000FF00 // Priority of interrupt 1
#define NVIC_IPR0_PRI_2 0x00FF0000 // Priority of interrupt 2
#define NVIC_IPR0_PRI_3 0xFF000000 // Priority of interrupt 3
//***************** Bit definition for NVIC_PRI1 register ******************
#define NVIC_IPR1_PRI_4 0x000000FF // Priority of interrupt 4
#define NVIC_IPR1_PRI_5 0x0000FF00 // Priority of interrupt 5
#define NVIC_IPR1_PRI_6 0x00FF0000 // Priority of interrupt 6
#define NVIC_IPR1_PRI_7 0xFF000000 // Priority of interrupt 7
//***************** Bit definition for NVIC_PRI2 register ******************
#define NVIC_IPR2_PRI_8 0x000000FF // Priority of interrupt 8
#define NVIC_IPR2_PRI_9 0x0000FF00 // Priority of interrupt 9
#define NVIC_IPR2_PRI_10 0x00FF0000 // Priority of interrupt 10
#define NVIC_IPR2_PRI_11 0xFF000000 // Priority of interrupt 11
//***************** Bit definition for NVIC_PRI3 register ******************
#define NVIC_IPR3_PRI_12 0x000000FF // Priority of interrupt 12
#define NVIC_IPR3_PRI_13 0x0000FF00 // Priority of interrupt 13
#define NVIC_IPR3_PRI_14 0x00FF0000 // Priority of interrupt 14
#define NVIC_IPR3_PRI_15 0xFF000000 // Priority of interrupt 15
//***************** Bit definition for NVIC_PRI4 register ******************
#define NVIC_IPR4_PRI_16 0x000000FF // Priority of interrupt 16
#define NVIC_IPR4_PRI_17 0x0000FF00 // Priority of interrupt 17
#define NVIC_IPR4_PRI_18 0x00FF0000 // Priority of interrupt 18
#define NVIC_IPR4_PRI_19 0xFF000000 // Priority of interrupt 19
//***************** Bit definition for NVIC_PRI5 register ******************
#define NVIC_IPR5_PRI_20 0x000000FF // Priority of interrupt 20
#define NVIC_IPR5_PRI_21 0x0000FF00 // Priority of interrupt 21
#define NVIC_IPR5_PRI_22 0x00FF0000 // Priority of interrupt 22
#define NVIC_IPR5_PRI_23 0xFF000000 // Priority of interrupt 23
//***************** Bit definition for NVIC_PRI6 register ******************
#define NVIC_IPR6_PRI_24 0x000000FF // Priority of interrupt 24
#define NVIC_IPR6_PRI_25 0x0000FF00 // Priority of interrupt 25
#define NVIC_IPR6_PRI_26 0x00FF0000 // Priority of interrupt 26
#define NVIC_IPR6_PRI_27 0xFF000000 // Priority of interrupt 27
//***************** Bit definition for NVIC_PRI7 register ******************
#define NVIC_IPR7_PRI_28 0x000000FF // Priority of interrupt 28
#define NVIC_IPR7_PRI_29 0x0000FF00 // Priority of interrupt 29
#define NVIC_IPR7_PRI_30 0x00FF0000 // Priority of interrupt 30
#define NVIC_IPR7_PRI_31 0xFF000000 // Priority of interrupt 31
//---------- definitions for L100 ---------------
// copied from libopencm3
#define NVIC_WWDG_IRQ 0
#define NVIC_PVD_IRQ 1
#define NVIC_TAMPER_STAMP_IRQ 2
#define NVIC_RTC_WKUP_IRQ 3
#define NVIC_FLASH_IRQ 4
#define NVIC_RCC_IRQ 5
#define NVIC_EXTI0_IRQ 6
#define NVIC_EXTI1_IRQ 7
#define NVIC_EXTI2_IRQ 8
#define NVIC_EXTI3_IRQ 9
#define NVIC_EXTI4_IRQ 10
#define NVIC_DMA1_CHANNEL1_IRQ 11
#define NVIC_DMA1_CHANNEL2_IRQ 12
#define NVIC_DMA1_CHANNEL3_IRQ 13
#define NVIC_DMA1_CHANNEL4_IRQ 14
#define NVIC_DMA1_CHANNEL5_IRQ 15
#define NVIC_DMA1_CHANNEL6_IRQ 16
#define NVIC_DMA1_CHANNEL7_IRQ 17
#define NVIC_ADC1_IRQ 18
#define NVIC_USB_HP_IRQ 19
#define NVIC_USB_LP_IRQ 20
#define NVIC_DAC_IRQ 21
#define NVIC_COMP_IRQ 22
#define NVIC_EXTI9_5_IRQ 23
#define NVIC_LCD_IRQ 24
#define NVIC_TIM9_IRQ 25
#define NVIC_TIM10_IRQ 26
#define NVIC_TIM11_IRQ 27
#define NVIC_TIM2_IRQ 28
#define NVIC_TIM3_IRQ 29
#define NVIC_TIM4_IRQ 30
#define NVIC_I2C1_EV_IRQ 31
#define NVIC_I2C1_ER_IRQ 32
#define NVIC_I2C2_EV_IRQ 33
#define NVIC_I2C2_ER_IRQ 34
#define NVIC_SPI1_IRQ 35
#define NVIC_SPI2_IRQ 36
#define NVIC_USART1_IRQ 37
#define NVIC_USART2_IRQ 38
#define NVIC_USART3_IRQ 39
#define NVIC_EXTI15_10_IRQ 40
#define NVIC_RTC_ALARM_IRQ 41
#define NVIC_USB_FS_WAKEUP_IRQ 42
#define NVIC_TIM6_IRQ 43
#define NVIC_TIM7_IRQ 44
#define NVIC_SDIO_IRQ 45
#define NVIC_TIM5_IRQ 46
#define NVIC_SPI3_IRQ 47
#define NVIC_UART4_IRQ 48
#define NVIC_UART5_IRQ 49
#define NVIC_DMA2_CH1_IRQ 50
#define NVIC_DMA2_CH2_IRQ 51
#define NVIC_DMA2_CH3_IRQ 52
#define NVIC_DMA2_CH4_IRQ 53
#define NVIC_DMA2_CH5_IRQ 54
#define NVIC_AES_IRQ 55
#define NVIC_COMP_ACQ_IRQ 56
#define NVIC_IRQ_COUNT 57

18
main.c
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@ -13,6 +13,24 @@ void say_hello(void)
}
/** IRQ */
void USART3_IRQHandler(void)
{
if (USART3_SR & USART_SR_ORE) {
USART3_SR &= ~USART_SR_ORE;
return;
}
blue_blink();
char c = usart_rx_char(USART3);
usart_tx_char(USART3, c);
USART3_SR ^= USART_SR_RXNE;
}
/** Called by startup script, before main() */
void SystemInit(void)
{

8
proj.pro
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@ -29,7 +29,9 @@ SOURCES += \
utils/timebase.c \
utils/usart.c \
utils/debounce.c \
blink.c
blink.c \
lib/common.c \
utils/nvic.c
HEADERS += \
lib/common.h \
@ -54,5 +56,7 @@ HEADERS += \
lib/defs_dma.h \
lib/defs_i2c.h \
lib/defs_spi.h \
lib/defs_timers.h
lib/defs_timers.h \
lib/defs_nvic.h \
utils/nvic.h

64
utils/nvic.c
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@ -0,0 +1,64 @@
#include "nvic.h"
// implementation stolen from libopencm3, originally under LGPL
void nvic_enable_irq(uint8_t irqn)
{
NVIC_ISER(irqn / 32) = (1 << (irqn % 32));
}
void nvic_disable_irq(uint8_t irqn)
{
NVIC_ICER(irqn / 32) = (1 << (irqn % 32));
}
uint8_t nvic_get_pending_irq(uint8_t irqn)
{
return NVIC_ISPR(irqn / 32) & (1 << (irqn % 32)) ? 1 : 0;
}
void nvic_set_pending_irq(uint8_t irqn)
{
NVIC_ISPR(irqn / 32) = (1 << (irqn % 32));
}
void nvic_clear_pending_irq(uint8_t irqn)
{
NVIC_ICPR(irqn / 32) = (1 << (irqn % 32));
}
uint8_t nvic_get_irq_enabled(uint8_t irqn)
{
return NVIC_ISER(irqn / 32) & (1 << (irqn % 32)) ? 1 : 0;
}
void nvic_set_priority(uint8_t irqn, uint8_t priority)
{
NVIC_IPR(irqn) = priority;
}
void nvic_set_priority_arm(int8_t irqn, uint8_t priority)
{
SCS_SHPR((irqn & 0xF) - 4) = priority; // maybe wrong
}
uint8_t nvic_get_active_irq(uint8_t irqn)
{
return NVIC_IABR(irqn / 32) & (1 << (irqn % 32)) ? 1 : 0;
}
void nvic_generate_software_interrupt(uint16_t irqn)
{
if (irqn <= 239) {
NVIC_STIR |= irqn;
}
}

24
utils/nvic.h
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@ -0,0 +1,24 @@
#pragma once
#include "common.h"
// implementation stolen from libopencm3, originally under LGPL
void nvic_enable_irq(uint8_t irqn);
void nvic_disable_irq(uint8_t irqn);
uint8_t nvic_get_pending_irq(uint8_t irqn);
void nvic_set_pending_irq(uint8_t irqn);
void nvic_clear_pending_irq(uint8_t irqn);
uint8_t nvic_get_irq_enabled(uint8_t irqn);
void nvic_set_priority(uint8_t irqn, uint8_t priority);
void nvic_set_priority_arm(int8_t irqn, uint8_t priority); // negative numbers (ie SYSTICK)
uint8_t nvic_get_active_irq(uint8_t irqn);
void nvic_generate_software_interrupt(uint16_t irqn); // 0-239
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