diff options
| -rw-r--r-- | .gitignore | 9 | ||||
| -rw-r--r-- | Makefile | 41 | ||||
| -rw-r--r-- | main.c | 25 |
3 files changed, 75 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..596a14b --- /dev/null +++ b/.gitignore @@ -0,0 +1,9 @@ +# C +**/*.o +**/*.elf +**/*.hex +**/*.out + +# Vim +*.swp +*.core diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..27092b1 --- /dev/null +++ b/Makefile @@ -0,0 +1,41 @@ +CC = avr-gcc +MCU = atmega328p +TARGET = blink + +SRC = main.c +OBJ = $(SRC:.c=.o) + +CFLAGS = -std=gnu99 +CFLAGS += -Os +CFLAGS+= -Wall +CFLAGS+= -mmcu=$(MCU) +CFLAGS+= -DF_CPU=16000000UL +CFLAGS+= -ffunction-sections -fdata-sections + +LDFLAGS = -mmcu=$(MCU) +LDFLAGS += -Wl,--gc-sections + +HEX_FLAGS = -O ihex +HEX_FLAGS += -j .text -j .data + +AVRDUDE_FLAGS = -p $(MCU) +AVRDUDE_FLAGS += -c arduino +AVRDUDE_FLAGS += -P /dev/cuaU0 +AVRDUDE_FLAGS += -D -U + +%.o: %.c + $(CC) $(CFLAGS) -c -o $@ $< + +elf: $(OBJ) + $(CC) $(LDFLAGS) $(OBJ) -o $(TARGET).elf + +hex: elf + avr-objcopy $(HEX_FLAGS) $(TARGET).elf $(TARGET).hex + +upload: hex + avrdude $(AVRDUDE_FLAGS) flash:w:$(TARGET).hex:i + +.PHONY: clean + +clean: + rm *.o *.elf *.hex @@ -0,0 +1,25 @@ +#include <avr/io.h> +#include <avr/interrupt.h> + +int main(void) +{ + DDRB |= (1 << DDB5); + + TCCR1A = 0; + TCNT1 = 65535 - (F_CPU / 1024); + TCCR1B = (1 << CS10) | (1 << CS12); + TIMSK1 = (1 << TOIE1); + + sei(); + + for (;;) + ; + + return 0; +} + +ISR(TIMER1_OVF_vect) +{ + PORTB ^= (1 << 5); + TCNT1 = 65535 - (F_CPU / 1024); +} |