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Sample code and its Makefile for Arduino Uno using the AVR library
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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <stdint.h> | |
| #include <avr/io.h> | |
| #include <util/delay.h> | |
| #define LED_DDR DDRB | |
| #define LED_PIN PINB | |
| #define LED PB5 | |
| int main(void) | |
| { | |
| LED_DDR |= _BV(LED); | |
| while (1) | |
| { | |
| LED_PIN |= _BV(LED); | |
| _delay_ms(50); | |
| } | |
| return(0); | |
| } |
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| MCU = atmega328p | |
| TARGET_ARCH = -mmcu=$(MCU) | |
| TARGET = main | |
| CC = avr-gcc | |
| CPPFLAGS = -mmcu=$(MCU) | |
| CFLAGS = -Os -g -Wall -I. -DF_CPU=16000000 | |
| LDFLAGS = -g -mmcu=$(MCU) -lm -Wl,--gc-sections -Os | |
| PGMER = -c arduino -b 115200 -P /dev/ttyACM0 | |
| PGMERISP = -c avrispv2 -P /dev/ttyACM0 | |
| DUDE = /usr/bin/avrdude -V -p $(MCU) | |
| C_SRCS = $(wildcard *.c) | |
| OBJ_FILES = $(C_SRCS:.c=.o) | |
| all: $(TARGET).hex | |
| clean: | |
| rm -f $(TARGET).elf *.o *.hex | |
| %.o: %.c | |
| $(CC) -c $(CPPFLAGS) $(CFLAGS) $< -o $@ | |
| $(TARGET).elf: $(OBJ_FILES) | |
| $(CC) $(LDFLAGS) -o $@ $(OBJ_FILES) | |
| $(TARGET).hex: $(TARGET).elf | |
| avr-objcopy -j .text -j .data -O ihex $(TARGET).elf $(TARGET).hex | |
| avr-objcopy -j .eeprom --set-section-flags=.eeprom="alloc,load" --change-section-lma .eeprom=0 -O ihex main.elf eeprom.hex | |
| upload: $(TARGET).hex | |
| $(DUDE) $(PGMER) -U flash:w:main.hex | |
| size: main.elf | |
| avr-size --format=avr --mcu=$(MCU) main.elf |
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