Initial commit.

.gitignore

@@ -0,0 +1,5 @@
+.cache/
+*.hex
+*.elf
+*.o
+compile_commands.json

Makefile

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+PREFIX := avr-
+CFLAGS_COMMON := -I/usr/avr/include/
+CFLAGS_CPU := -DF_CPU=20000000UL -mmcu=atmega328p -Os
+CFLAGS := $(CFLAGS_COMMON) $(CFLAGS_CPU)
+LDFLAGS_COMMON := -I/usr/avr/include/
+LDFLAGS_CPU := -mmcu=atmega328p
+LDFLAGS := $(LDFLAGS_COMMON) $(LDFLAGS_CPU)
+CC := $(PREFIX)gcc
+
+build: main.hex
+
+flash: main.hex
+	sudo avrdude -FV -c arduino -p ATmega328p -P /dev/ttyUSB0 -b 57600 -U flash:w:$<
+
+clean:
+	$(RM) *.hex *.elf *.o
+
+bear: compile_commands.json
+
+compile_commands.json: clean
+	bear -- make build
+
+main.hex: main.elf
+	$(PREFIX)objcopy -O ihex -R .eeprom $< $@
+
+main.elf: main.o
+	$(CC) -w $(LDFLAGS) -o $@ $<
+
+%.o: %.c %.h
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+.PHONY: build flash clean bear

main.c

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+#include <avr/io.h>
+#include <util/delay.h>
+
+int main(void) {
+  DDRD = 255;
+
+  while (1) {
+    PORTD = 0b00001000;
+    _delay_ms(100);
+    PORTD = 0;
+    _delay_ms(100);
+  }
+  return 0;
+}