commit
13e5dd45b2
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#############################################
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# CPU type
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MCU = atmega328p
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# CPU frequency [Hz]
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F_CPU = 16000000
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# Fuses (refer to datasheet)
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LFUSE = 0xFF
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HFUSE = 0xDE
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EFUSE = 0x05
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# Avrdude settings
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PROG_TYPE = arduino
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PROG_ARGS = -b 57600 -P /dev/ttyUSB0
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#############################################
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# Main file
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BINARY = main
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# Obj files to be built <- add .o for any .c files you add!
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OBJS = $(BINARY).o
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OBJS += lib/usart.o
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OBJS += lib/iopins.o
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# Dirs with header files
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INCL_DIRS = . lib/
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# Pre-defined macros
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DEFS = -DF_CPU=$(F_CPU)UL
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#############################################
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# C flags
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CFLAGS = -std=gnu99 -mmcu=$(MCU) $(DEFS) $(INCL_DIRS:%=-I%)
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CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -ffreestanding
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CFLAGS += -Wall -Wno-main -Wno-strict-prototypes -Wno-comment
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CFLAGS += -g2 -Wextra -Wfatal-errors -Wno-unused-but-set-variable
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CFLAGS += -ffunction-sections -fdata-sections -Os
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LDFLAGS = -Wl,--gc-sections -Wl,--relax -lm
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#LD_FLAGS += -Wl,-u,vfprintf -lprintf_flt -lm ## for floating-point printf
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#LD_FLAGS += -Wl,-u,vfprintf -lprintf_min ## for smaller printf
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#############################################
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## Defined programs / locations
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CC = avr-gcc
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OBJCOPY = avr-objcopy
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OBJDUMP = avr-objdump
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AVRSIZE = avr-size
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AVRDUDE = avrdude
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JUNK = *.o *.d *.elf *.bin *.hex *.srec *.list *.lst *.map *.dis *.disasm *.eep *.eeprom *.lss
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.SUFFIXES: .elf .bin .hex .lst .map .eeprom .pre |
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.SECONDEXPANSION: |
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.SECONDARY: |
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.PHONY: all elf bin hex lst pre ee eeprom dis size clean flash flashe shell fuses show_fuses set_default_fuses |
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all: hex size |
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elf: $(BINARY).elf |
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bin: $(BINARY).bin |
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hex: $(BINARY).hex |
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lst: $(BINARY).lst |
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pre: $(BINARY).pre |
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ee: $(BINARY).eeprom |
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eeprom: $(BINARY).eeprom |
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dis: lst |
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# Show how big the resulting program is
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size: elf |
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$(AVRSIZE) -C --mcu=$(MCU) $(BINARY).elf
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# --- Magic build targets ----------------
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%.hex: %.elf |
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$(OBJCOPY) -R .eeprom -O ihex $< $@
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%.elf %.map: $(OBJS) |
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$(CC) $(CFLAGS) $(LDFLAGS) $(OBJS) -o $(*).elf
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%.pre: %.c |
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$(CC) $(CFLAGS) -E $(*).c --output $@
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%.eeprom: %.elf |
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$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@
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%.lst: %.elf |
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$(Q)$(OBJDUMP) -S $(*).elf > $(*).lst
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%.o: %.c |
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$(CC) $(CFLAGS) -o $(*).o -c $(*).c
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%.o: %.s |
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$(CC) $(CFLAGS) -o $(*).o -c $(*).s
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# Clean all produced trash
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clean: |
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rm -f $(JUNK)
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cd lib && rm -f $(JUNK)
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## === avrdude ===
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flash: $(BINARY).hex |
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$(AVRDUDE) -c $(PROG_TYPE) -p $(MCU) $(PROG_ARGS) -U flash:w:$<
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flashe: $(BINARY).eeprom |
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$(AVRDUDE) -c $(PROG_TYPE) -p $(MCU) $(PROG_ARGS) -U eeprom:w:$<
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shell: |
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$(AVRDUDE) -c $(PROG_TYPE) -p $(MCU) $(PROG_ARGS) -nt
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# === fuses ===
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FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m
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fuses: |
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$(AVRDUDE) -c $(PROG_TYPE) -p $(MCU) $(PROG_ARGS) $(FUSE_STRING)
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show_fuses: |
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$(AVRDUDE) -c $(PROG_TYPE) -p $(MCU) $(PROG_ARGS) -nv
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set_default_fuses: FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m |
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set_default_fuses: fuses |
@ -0,0 +1,89 @@ |
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#pragma once |
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//
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// Bit and byte manipulation utilities
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//
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#include <stdint.h> |
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// --- Increment in range ---
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// when overflown, wraps within range. Lower bound < upper bound.
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// ..., upper bound excluded
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#define inc_wrap(var, min, max) { if ((var) >= (max - 1)) { (var) = (min); } else { (var)++; } } |
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// ..., upper bound included
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#define inc_wrapi(var, min, max) inc_wrap((var), (min), (max) + 1) |
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// --- Decrement in range ---
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// when underflown, wraps within range. Lower bound < upper bound.
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// ..., upper bound excluded
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#define dec_wrap(var, min, max) { if ((var) <= (min)) { (var) = (max) - 1; } else { (var)--; } } |
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// ..., upper bound included
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#define dec_wrapi(var, min, max) dec_wrap((var), (min), (max) + 1) |
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// --- Bit manipulation --
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// Set bit
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#define sbi(reg, bit) { (reg) |= (1 << (uint8_t)(bit)); } |
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// Clear bit
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#define cbi(reg, bit) { (reg) &= ~(1 << (uint8_t)(bit)); } |
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// Get n-th bit
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#define get_bit(reg, bit) (((reg) >> (uint8_t)(bit)) & 0x1) |
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// Test n-th bit (Can't use bit_is_set, as it's redefined in sfr_def.h)
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#define bit_is_high(reg, bit) get_bit(reg, bit) |
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#define bit_is_low(reg, bit) (!get_bit(reg, bit)) |
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// Write value to n-th bit
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#define set_bit(reg, bit, value) { (reg) = ((reg) & ~(1 << (uint8_t)(bit))) | (((uint8_t)(value) & 0x1) << (uint8_t)(bit)); } |
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// Invert n-th bit
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#define toggle_bit(reg, bit) { (reg) ^= (1 << (uint8_t)(bit)); } |
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// --- Bit manipulation with pointer to variable ---
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// Set n-th bit in pointee
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#define sbi_p(reg_p, bit) { (*(reg_p)) |= (1 << (uint8_t)(bit)); } |
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// Clear n-th bit in pointee
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#define cbi_p(reg_p, bit) { (*(reg_p)) &= ~(1 << (uint8_t)(bit)); } |
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// Get n-th bit in pointee
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#define get_bit_p(reg_p, bit) ((*(reg_p) >> (uint8_t)(bit)) & 0x1) |
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// Test n-th bit in pointee (Can't use bit_is_set, as it's redefined in sfr_def.h)
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#define bit_is_high_p(reg_p, bit) get_bit_p(reg_p, bit) |
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#define bit_is_low_p(reg_p, bit) (!get_bit_p(reg_p, bit)) |
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// Write value to a bit in pointee
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#define set_bit_p(reg_p, bit, value) { *(reg_p) = (*(reg_p) & ~(1 << ((uint8_t)(bit) & 0x1))) | (((uint8_t)(value) & 0x1) << (uint8_t)(bit)); } |
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#define toggle_bit_p(reg_p, bit) { *(reg_p) ^= (1 << (uint8_t)(bit)); } |
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// --- Nibble manipulation ---
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// Replace nibble in a byte
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#define set_low_nibble(reg, value) { (reg) = ((reg) & 0xF0) | ((uint8_t)(value) & 0xF); } |
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#define set_high_nibble(reg, value) { (reg) = ((reg) & 0x0F) | (((uint8_t)(value) & 0xF) << 4); } |
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#define set_low_nibble_p(reg_p, value) { *(reg_p) = (*(reg_p) & 0xF0) | ((uint8_t)(value) & 0xF); } |
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#define set_high_nibble_p(reg_p, value) { *(reg_p) = (*(reg_p) & 0x0F) | (((uint8_t)(value) & 0xF) << 4); } |
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#define low_nibble(x) ((uint8_t)(x) & 0xF) |
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#define high_nibble(x) (((uint8_t)(x) & 0xF0) >> 4) |
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// --- Range tests ---
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// Test if X is within low..high, regardless of bounds order
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#define in_range(x, low, high) ((((low) < (high)) && ((x) >= (low) && (x) < (high))) || (((low) > (high)) && ((x) >= (high) && (x) < (low)))) |
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// ..., include greater bound
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#define in_rangei(x, low, high) ((((low) <= (high)) && ((x) >= (low) && (x) <= (high))) || (((low) > (high)) && ((x) >= (high) && (x) <= (low)))) |
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// Test if X in low..high, wrap around ends if needed.
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#define in_range_wrap(x, low, high) ((((low) < (high)) && ((x) >= (low) && (x) < (high))) || (((low) > (high)) && ((x) >= (low) || (x) < (high)))) |
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// ..., include upper bound
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#define in_range_wrapi(x, low, high) ((((low) <= (high)) && ((x) >= (low) && (x) <= (high))) || (((low) > (high)) && ((x) >= (low) || (x) <= (high)))) |
@ -0,0 +1,277 @@ |
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#include <avr/io.h> |
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#include <stdbool.h> |
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#include <stdint.h> |
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#include "calc.h" |
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#include "iopins.h" |
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void set_dir_n(uint8_t pin, uint8_t d) |
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{ |
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switch(pin) { |
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case 0: set_dir(0, d); return; |
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case 1: set_dir(1, d); return; |
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case 2: set_dir(2, d); return; |
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case 3: set_dir(3, d); return; |
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case 4: set_dir(4, d); return; |
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case 5: set_dir(5, d); return; |
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case 6: set_dir(6, d); return; |
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case 7: set_dir(7, d); return; |
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case 8: set_dir(8, d); return; |
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case 9: set_dir(9, d); return; |
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case 10: set_dir(10, d); return; |
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case 11: set_dir(11, d); return; |
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case 12: set_dir(12, d); return; |
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case 13: set_dir(13, d); return; |
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case 14: set_dir(14, d); return; |
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case 15: set_dir(15, d); return; |
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case 16: set_dir(16, d); return; |
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case 17: set_dir(17, d); return; |
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case 18: set_dir(18, d); return; |
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case 19: set_dir(19, d); return; |
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case 20: set_dir(20, d); return; |
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case 21: set_dir(21, d); return; |
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} |
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} |
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void as_input_n(uint8_t pin) |
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{ |
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switch(pin) { |
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case 0: as_input(0); return; |
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case 1: as_input(1); return; |
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case 2: as_input(2); return; |
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case 3: as_input(3); return; |
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case 4: as_input(4); return; |
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case 5: as_input(5); return; |
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case 6: as_input(6); return; |
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case 7: as_input(7); return; |
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case 8: as_input(8); return; |
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case 9: as_input(9); return; |
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case 10: as_input(10); return; |
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case 11: as_input(11); return; |
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case 12: as_input(12); return; |
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case 13: as_input(13); return; |
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case 14: as_input(14); return; |
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case 15: as_input(15); return; |
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case 16: as_input(16); return; |
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case 17: as_input(17); return; |
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case 18: as_input(18); return; |
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case 19: as_input(19); return; |
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case 20: as_input(20); return; |
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case 21: as_input(21); return; |
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} |
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} |
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void as_input_pu_n(uint8_t pin) |
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{ |
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switch(pin) { |
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case 0: as_input_pu(0); return; |
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case 1: as_input_pu(1); return; |
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case 2: as_input_pu(2); return; |
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case 3: as_input_pu(3); return; |
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case 4: as_input_pu(4); return; |
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case 5: as_input_pu(5); return; |
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case 6: as_input_pu(6); return; |
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case 7: as_input_pu(7); return; |
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case 8: as_input_pu(8); return; |
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case 9: as_input_pu(9); return; |
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case 10: as_input_pu(10); return; |
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case 11: as_input_pu(11); return; |
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case 12: as_input_pu(12); return; |
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case 13: as_input_pu(13); return; |
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case 14: as_input_pu(14); return; |
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case 15: as_input_pu(15); return; |
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case 16: as_input_pu(16); return; |
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case 17: as_input_pu(17); return; |
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case 18: as_input_pu(18); return; |
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case 19: as_input_pu(19); return; |
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case 20: as_input_pu(20); return; |
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case 21: as_input_pu(21); return; |
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} |
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} |
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void as_output_n(uint8_t pin) |
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{ |
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switch(pin) { |
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case 0: as_output(0); return; |
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case 1: as_output(1); return; |
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case 2: as_output(2); return; |
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case 3: as_output(3); return; |
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case 4: as_output(4); return; |
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case 5: as_output(5); return; |
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case 6: as_output(6); return; |
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case 7: as_output(7); return; |
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case 8: as_output(8); return; |
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case 9: as_output(9); return; |
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case 10: as_output(10); return; |
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case 11: as_output(11); return; |
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case 12: as_output(12); return; |
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case 13: as_output(13); return; |
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case 14: as_output(14); return; |
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case 15: as_output(15); return; |
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case 16: as_output(16); return; |
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case 17: as_output(17); return; |
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case 18: as_output(18); return; |
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case 19: as_output(19); return; |
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case 20: as_output(20); return; |
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case 21: as_output(21); return; |
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} |
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} |
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void pin_set_n(uint8_t pin, uint8_t v) |
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{ |
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switch(pin) { |
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case 0: pin_set(0, v); return; |
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case 1: pin_set(1, v); return; |
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case 2: pin_set(2, v); return; |
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case 3: pin_set(3, v); return; |
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case 4: pin_set(4, v); return; |
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case 5: pin_set(5, v); return; |
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case 6: pin_set(6, v); return; |
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case 7: pin_set(7, v); return; |
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case 8: pin_set(8, v); return; |
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case 9: pin_set(9, v); return; |
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case 10: pin_set(10, v); return; |
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case 11: pin_set(11, v); return; |
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case 12: pin_set(12, v); return; |
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case 13: pin_set(13, v); return; |
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case 14: pin_set(14, v); return; |
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case 15: pin_set(15, v); return; |
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case 16: pin_set(16, v); return; |
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case 17: pin_set(17, v); return; |
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case 18: pin_set(18, v); return; |
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case 19: pin_set(19, v); return; |
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case 20: pin_set(20, v); return; |
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case 21: pin_set(21, v); return; |
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} |
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} |
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void pin_down_n(uint8_t pin) |
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{ |
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switch(pin) { |
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case 0: pin_down(0); return; |
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case 1: pin_down(1); return; |
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case 2: pin_down(2); return; |
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case 3: pin_down(3); return; |
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case 4: pin_down(4); return; |
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case 5: pin_down(5); return; |
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case 6: pin_down(6); return; |
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case 7: pin_down(7); return; |
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case 8: pin_down(8); return; |
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case 9: pin_down(9); return; |
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case 10: pin_down(10); return; |
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case 11: pin_down(11); return; |
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case 12: pin_down(12); return; |
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case 13: pin_down(13); return; |
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case 14: pin_down(14); return; |
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case 15: pin_down(15); return; |
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case 16: pin_down(16); return; |
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case 17: pin_down(17); return; |
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case 18: pin_down(18); return; |
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case 19: pin_down(19); return; |
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case 20: pin_down(20); return; |
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case 21: pin_down(21); return; |
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} |
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} |
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void pin_up_n(uint8_t pin) |
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{ |
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switch(pin) { |
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case 0: pin_up(0); return; |
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case 1: pin_up(1); return; |
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case 2: pin_up(2); return; |
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case 3: pin_up(3); return; |
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case 4: pin_up(4); return; |
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case 5: pin_up(5); return; |
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case 6: pin_up(6); return; |
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case 7: pin_up(7); return; |
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case 8: pin_up(8); return; |
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case 9: pin_up(9); return; |
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case 10: pin_up(10); return; |
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case 11: pin_up(11); return; |
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case 12: pin_up(12); return; |
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case 13: pin_up(13); return; |
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case 14: pin_up(14); return; |
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case 15: pin_up(15); return; |
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case 16: pin_up(16); return; |
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case 17: pin_up(17); return; |
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case 18: pin_up(18); return; |
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case 19: pin_up(19); return; |
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case 20: pin_up(20); return; |
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case 21: pin_up(21); return; |
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} |
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} |
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void pin_toggle_n(uint8_t pin) |
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{ |
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switch(pin) { |
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case 0: pin_toggle(0); return; |
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case 1: pin_toggle(1); return; |
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case 2: pin_toggle(2); return; |
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case 3: pin_toggle(3); return; |
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case 4: pin_toggle(4); return; |
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case 5: pin_toggle(5); return; |
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case 6: pin_toggle(6); return; |
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case 7: pin_toggle(7); return; |
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case 8: pin_toggle(8); return; |
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case 9: pin_toggle(9); return; |
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case 10: pin_toggle(10); return; |
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case 11: pin_toggle(11); return; |
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case 12: pin_toggle(12); return; |
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case 13: pin_toggle(13); return; |
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case 14: pin_toggle(14); return; |
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case 15: pin_toggle(15); return; |
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case 16: pin_toggle(16); return; |
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case 17: pin_toggle(17); return; |
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case 18: pin_toggle(18); return; |
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case 19: pin_toggle(19); return; |
||||
case 20: pin_toggle(20); return; |
||||
case 21: pin_toggle(21); return; |
||||
} |
||||
} |
||||
|
||||
|
||||
bool pin_read_n(uint8_t pin) |
||||
{ |
||||
switch(pin) { |
||||
case 0: return pin_read(0); |
||||
case 1: return pin_read(1); |
||||
case 2: return pin_read(2); |
||||
case 3: return pin_read(3); |
||||
case 4: return pin_read(4); |
||||
case 5: return pin_read(5); |
||||
case 6: return pin_read(6); |
||||
case 7: return pin_read(7); |
||||
case 8: return pin_read(8); |
||||
case 9: return pin_read(9); |
||||
case 10: return pin_read(10); |
||||
case 11: return pin_read(11); |
||||
case 12: return pin_read(12); |
||||
case 13: return pin_read(13); |
||||
case 14: return pin_read(14); |
||||
case 15: return pin_read(15); |
||||
case 16: return pin_read(16); |
||||
case 17: return pin_read(17); |
||||
case 18: return pin_read(18); |
||||
case 19: return pin_read(19); |
||||
case 20: return pin_read(20); |
||||
case 21: return pin_read(21); |
||||
} |
||||
return false; |
||||
} |
||||
|
||||
|
||||
bool pin_is_low_n(uint8_t pin) |
||||
{ |
||||
return !pin_read_n(pin); |
||||
} |
||||
|
||||
|
||||
bool pin_is_high_n(uint8_t pin) |
||||
{ |
||||
return pin_read_n(pin); |
||||
} |
@ -0,0 +1,213 @@ |
||||
#pragma once |
||||
|
||||
//
|
||||
// * Utilities for pin aliasing / numbering. *
|
||||
//
|
||||
// Designed for Arduino.
|
||||
//
|
||||
// If you know the pin number beforehand, you can use the macros.
|
||||
//
|
||||
// If you need to use a variable for pin number, use the `_n` functions.
|
||||
// They are much slower, so always check if you really need them
|
||||
// - and they aren't fit for things where precise timing is required.
|
||||
//
|
||||
|
||||
#include <avr/io.h> |
||||
#include <stdbool.h> |
||||
#include <stdint.h> |
||||
|
||||
#include "calc.h" |
||||
|
||||
|
||||
// type: pointer to port
|
||||
typedef volatile uint8_t* PORT_P; |
||||
|
||||
|
||||
/** Pin numbering reference */ |
||||
#define D0 0 |
||||
#define D1 1 |
||||
#define D2 2 |
||||
#define D3 3 |
||||
#define D4 4 |
||||
#define D5 5 |
||||
#define D6 6 |
||||
#define D7 7 |
||||
#define D8 8 |
||||
#define D9 9 |
||||
#define D10 10 |
||||
#define D11 11 |
||||
#define D12 12 |
||||
#define D13 13 |
||||
#define D14 14 |
||||
#define D15 15 |
||||
#define D16 16 |
||||
#define D17 17 |
||||
#define D18 18 |
||||
#define D19 19 |
||||
#define D20 20 |
||||
#define D21 21 |
||||
#define A0 14 |
||||
#define A1 15 |
||||
#define A2 16 |
||||
#define A3 17 |
||||
#define A4 18 |
||||
#define A5 19 |
||||
#define A6 20 |
||||
#define A7 21 |
||||
|
||||
|
||||
#define _ddr(pin) _DDR_##pin |
||||
#define _pin(pin) _PIN_##pin |
||||
#define _pn(pin) _PN_##pin |
||||
#define _port(pin) _PORT_##pin |
||||
|
||||
|
||||
/** Set pin direction */ |
||||
#define set_dir(pin, d) set_bit( _ddr(pin), _pn(pin), d ) |
||||
void set_dir_n(const uint8_t pin, const uint8_t d); |
||||
|
||||
|
||||
/** Configure pin as input */ |
||||
#define as_input(pin) cbi( _ddr(pin), _pn(pin) ) |
||||
void as_input_n(const uint8_t pin); |
||||
|
||||
|
||||
/** Configure pin as input, with pull-up enabled */ |
||||
#define as_input_pu(pin) { as_input(pin); pin_up(pin); } |
||||
void as_input_pu_n(const uint8_t pin); |
||||
|
||||
|
||||
/** Configure pin as output */ |
||||
#define as_output(pin) sbi( _ddr(pin), _pn(pin) ) |
||||
void as_output_n(const uint8_t pin); |
||||
|
||||
|
||||
/** Write value to a pin */ |
||||
#define pin_set(pin, v) set_bit( _port(pin), _pn(pin), v ) |
||||
void pin_set_n(const uint8_t pin, const uint8_t v); |
||||
|
||||
|
||||
/** Write 0 to a pin */ |
||||
#define pin_down(pin) cbi( _port(pin), _pn(pin) ) |
||||
void pin_down_n(const uint8_t pin); |
||||
|
||||
|
||||
/** Write 1 to a pin */ |
||||
#define pin_up(pin) sbi( _port(pin), _pn(pin) ) |
||||
void pin_up_n(uint8_t pin); |
||||
|
||||
|
||||
/** Toggle a pin state */ |
||||
#define pin_toggle(pin) sbi( _pin(pin), _pn(pin) ) |
||||
void pin_toggle_n(uint8_t pin); |
||||
|
||||
|
||||
/** Read a pin value */ |
||||
#define pin_read(pin) get_bit( _pin(pin), _pn(pin) ) |
||||
bool pin_read_n(uint8_t pin); |
||||
|
||||
|
||||
/** CHeck if pin is low */ |
||||
#define pin_is_low(pin) (get_pin(pin) == 0) |
||||
bool pin_is_low_n(uint8_t pin); |
||||
|
||||
|
||||
/** CHeck if pin is high */ |
||||
#define pin_is_high(pin) (get_pin(pin) != 0) |
||||
bool pin_is_high_n(uint8_t pin); |
||||
|
||||
|
||||
|
||||
// Helper macros
|
||||
|
||||
#define _PORT_0 PORTD |
||||
#define _PORT_1 PORTD |
||||
#define _PORT_2 PORTD |
||||
#define _PORT_3 PORTD |
||||
#define _PORT_4 PORTD |
||||
#define _PORT_5 PORTD |
||||
#define _PORT_6 PORTD |
||||
#define _PORT_7 PORTD |
||||
#define _PORT_8 PORTB |
||||
#define _PORT_9 PORTB |
||||
#define _PORT_10 PORTB |
||||
#define _PORT_11 PORTB |
||||
#define _PORT_12 PORTB |
||||
#define _PORT_13 PORTB |
||||
#define _PORT_14 PORTC |
||||
#define _PORT_15 PORTC |
||||
#define _PORT_16 PORTC |
||||
#define _PORT_17 PORTC |
||||
#define _PORT_18 PORTC |
||||
#define _PORT_19 PORTC |
||||
#define _PORT_20 PORTC |
||||
#define _PORT_21 PORTC |
||||
|
||||
#define _PIN_0 PIND |
||||
#define _PIN_1 PIND |
||||
#define _PIN_2 PIND |
||||
#define _PIN_3 PIND |
||||
#define _PIN_4 PIND |
||||
#define _PIN_5 PIND |
||||
#define _PIN_6 PIND |
||||
#define _PIN_7 PIND |
||||
#define _PIN_8 PINB |
||||
#define _PIN_9 PINB |
||||
#define _PIN_10 PINB |
||||
#define _PIN_11 PINB |
||||
#define _PIN_12 PINB |
||||
#define _PIN_13 PINB |
||||
#define _PIN_14 PINC |
||||
#define _PIN_15 PINC |
||||
#define _PIN_16 PINC |
||||
#define _PIN_17 PINC |
||||
#define _PIN_18 PINC |
||||
#define _PIN_19 PINC |
||||
#define _PIN_20 PINC |
||||
#define _PIN_21 PINC |
||||
|
||||
#define _DDR_0 DDRD |
||||
#define _DDR_1 DDRD |
||||
#define _DDR_2 DDRD |
||||
#define _DDR_3 DDRD |
||||
#define _DDR_4 DDRD |
||||
#define _DDR_5 DDRD |
||||
#define _DDR_6 DDRD |
||||
#define _DDR_7 DDRD |
||||
#define _DDR_8 DDRB |
||||
#define _DDR_9 DDRB |
||||
#define _DDR_10 DDRB |
||||
#define _DDR_11 DDRB |
||||
#define _DDR_12 DDRB |
||||
#define _DDR_13 DDRB |
||||
#define _DDR_14 DDRC |
||||
#define _DDR_15 DDRC |
||||
#define _DDR_16 DDRC |
||||
#define _DDR_17 DDRC |
||||
#define _DDR_18 DDRC |
||||
#define _DDR_19 DDRC |
||||
#define _DDR_20 DDRC |
||||
#define _DDR_21 DDRC |
||||
|
||||
#define _PN_0 0 |
||||
#define _PN_1 1 |
||||
#define _PN_2 2 |
||||
#define _PN_3 3 |
||||
#define _PN_4 4 |
||||
#define _PN_5 5 |
||||
#define _PN_6 6 |
||||
#define _PN_7 7 |
||||
#define _PN_8 0 |
||||
#define _PN_9 1 |
||||
#define _PN_10 2 |
||||
#define _PN_11 3 |
||||
#define _PN_12 4 |
||||
#define _PN_13 5 |
||||
#define _PN_14 0 |
||||
#define _PN_15 1 |
||||
#define _PN_16 2 |
||||
#define _PN_17 3 |
||||
#define _PN_18 4 |
||||
#define _PN_19 5 |
||||
#define _PN_20 6 |
||||
#define _PN_21 7 |
@ -0,0 +1,21 @@ |
||||
#pragma once |
||||
|
||||
//
|
||||
// Functions for precise delays (nanoseconds / cycles)
|
||||
//
|
||||
|
||||
#include <avr/io.h> |
||||
#include <util/delay_basic.h> |
||||
#include <stdint.h> |
||||
|
||||
/* Convert nanoseconds to cycle count */ |
||||
#define ns2cycles(ns) ( (ns) / (1000000000L / (signed long) F_CPU) ) |
||||
|
||||
/** Wait c cycles */ |
||||
#define delay_c(c) (((c) > 0) ? __builtin_avr_delay_cycles(c) : __builtin_avr_delay_cycles(0)) |
||||
|
||||
/** Wait n nanoseconds, plus c cycles */ |
||||
#define delay_ns_c(ns, c) delay_c(ns2cycles(ns) + (c)) |
||||
|
||||
/** Wait n nanoseconds */ |
||||
#define delay_ns(ns) delay_c(ns2cycles(ns)) |
@ -0,0 +1,56 @@ |
||||
#include <avr/io.h> |
||||
#include <avr/pgmspace.h> |
||||
#include <util/delay.h> |
||||
|
||||
#include <stdbool.h> |
||||
#include <stdint.h> |
||||
#include <stdlib.h> |
||||
|
||||
#include "calc.h" |
||||
#include "usart.h" |
||||
|
||||
|
||||
void usart_init(uint16_t ubrr) |
||||
{ |
||||
/*Set baud rate */ |
||||
UBRR0H = (uint8_t)(ubrr >> 8); |
||||
UBRR0L = (uint8_t) ubrr; |
||||
|
||||
// Enable Rx and Tx
|
||||
UCSR0B = (1 << RXEN0) | (1 << TXEN0); |
||||
|
||||
// 8-bit data, 1 stop bit
|
||||
UCSR0C = (0b11 << UCSZ00); |
||||
} |
||||
|
||||
|
||||
/** Send string over USART */ |
||||
void usart_puts(const char* str) |
||||
{ |
||||
while (*str) |
||||
{ |
||||
usart_tx(*str++); |
||||
} |
||||
} |
||||
|
||||
|
||||
/** Send progmem string over USART */ |
||||
void usart_puts_P(const char* str) |
||||
{ |
||||
char c; |
||||
while ((c = pgm_read_byte(str++))) |
||||
{ |
||||
usart_tx(c); |
||||
} |
||||
} |
||||
|
||||
|
||||
/** Clear receive buffer */ |
||||
void usart_clear_rx() |
||||
{ |
||||
uint8_t dummy; |
||||
while (bit_is_high(UCSR0A, RXC0)) |
||||
{ |
||||
dummy = UDR0; |
||||
} |
||||
} |
@ -0,0 +1,88 @@ |
||||
#pragma once |
||||
|
||||
//
|
||||
// Utilities for UART communication.
|
||||
//
|
||||
// First, init uart with usart_init().
|
||||
// Then enable interrupts you want with usart_XXX_isr_enable().
|
||||
//
|
||||
|
||||
#include <avr/io.h> |
||||
#include <avr/pgmspace.h> |
||||
#include <util/delay.h> |
||||
|
||||
#include <stdbool.h> |
||||
#include <stdint.h> |
||||
|
||||
/** Init UART with a UBRR value */ |
||||
void usart_init(uint16_t ubrr); |
||||
|
||||
// this is an alternative method of init:
|
||||
/** Init UART for given baudrate (works only for low values like 9600) */ |
||||
#define usart_init_baud(baud) usart_init(F_CPU / 16 / (baud) - 1) |
||||
|
||||
/** Check if there's a byte in the RX register */ |
||||
#define usart_rx_ready() (0 != (UCSR0A & (1 << RXC0))) |
||||
|
||||
/** Check if transmission of everything is done */ |
||||
#define usart_tx_ready() (0 != (UCSR0A & (1 << UDRE0))) |
||||
|
||||
|
||||
|
||||
|
||||
// ---- Enable UART interrupts ------------
|
||||
|
||||
/** Enable or disable RX ISR */ |
||||
inline void usart_rx_isr_enable(bool yes) |
||||
{ |
||||
set_bit(UCSR0B, RXCIE0, yes); |
||||
} |
||||
|
||||
/** Enable or disable TX ISR (1 byte is sent) */ |
||||
inline void usart_tx_isr_enable(bool yes) |
||||
{ |
||||
set_bit(UCSR0B, TXCIE0, yes); |
||||
} |
||||
|
||||
/** Enable or disable DRE ISR (all is sent) */ |
||||
inline void usart_dre_isr_enable(bool yes) |
||||
{ |
||||
set_bit(UCSR0B, UDRIE0, yes); |
||||
} |
||||
|
||||
|
||||
// ---- Basic IO --------------------------
|
||||
|
||||
/** Send byte over USART */ |
||||
inline void usart_tx(uint8_t data) |
||||
{ |
||||
// Wait for transmit buffer
|
||||
while (!usart_tx_ready()); |
||||
// send it
|
||||
UDR0 = data; |
||||
} |
||||
|
||||
|
||||
/** Receive one byte over USART */ |
||||
inline uint8_t usart_rx(void) |
||||
{ |
||||
// Wait for data to be received
|
||||
while (!usart_rx_ready()); |
||||
// Get and return received data from buffer
|
||||
return UDR0; |
||||
} |
||||
|
||||
/** Send byte over UART */ |
||||
#define usart_putc(data) usart_tx((data)) |
||||
|
||||
/** Clear receive buffer */ |
||||
void usart_clear_rx(); |
||||
|
||||
|
||||
// ---- Strings ---------------------------
|
||||
|
||||
/** Send string over UART */ |
||||
void usart_puts(const char* str); |
||||
|
||||
/** Send progmem string over UART */ |
||||
void usart_puts_P(const char* str); |
@ -0,0 +1,53 @@ |
||||
#include <avr/io.h> // register definitions |
||||
#include <avr/pgmspace.h> // storing data in program memory |
||||
#include <avr/interrupt.h> // interrupt vectors |
||||
#include <util/delay.h> // delay functions |
||||
|
||||
#include <stdint.h> // C header for int types like uint8_t |
||||
#include <stdbool.h> // C header for the bool type |
||||
|
||||
// Include stuff from the library
|
||||
#include "lib/iopins.h" |
||||
#include "lib/usart.h" |
||||
|
||||
void main() __attribute__ ((noreturn)); |
||||
|
||||
// Pins
|
||||
#define LED 13 |
||||
|
||||
|
||||
// UART receive handler
|
||||
ISR(USART_RX_vect) |
||||
{ |
||||
uint8_t b = usart_rx(); |
||||
usart_tx(b); // send back
|
||||
} |
||||
|
||||
|
||||
void main() |
||||
{ |
||||
usart_init(8); // set usart @ 115200 (8 is a UBRR value)
|
||||
usart_rx_isr_enable(true); // enable RX interrupt handler
|
||||
|
||||
// configure pins
|
||||
as_output(LED); |
||||
|
||||
// globally enable interrupts (for the USART_RX handler)
|
||||
sei(); |
||||
|
||||
while (1) { |
||||
// This string is in the program memory
|
||||
// PSTR is a special macro that puts it there.
|
||||
// That means it does not waste ram space, but
|
||||
// needs special treatment when being read.
|
||||
// (avr-gcc is a bit dumb in this)
|
||||
usart_puts_P( PSTR("Hello World\r\n") ); // Print a string to USART
|
||||
|
||||
// This one is copied to RAM before being printed = bad.
|
||||
usart_puts("Wastin' RAM!\r\n"); |
||||
|
||||
pin_toggle(13); |
||||
|
||||
_delay_ms(500); |
||||
} |
||||
} |
Loading…
Reference in new issue