Initial import

.gitignore

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+*.hex
+*.elf
+*.o
+

blink.c

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+#include <avr/io.h>
+
+#define F_CPU 20000000UL
+#include <util/delay.h>
+
+int main() {
+	DDRB |= 1;
+
+	while(1) {
+		PORTB |= 1;
+		_delay_ms(50);
+		PORTB &= ~1;
+		_delay_ms(950);
+	}
+
+	return 1;
+}

buildandupload.sh

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+#!/bin/bash
+
+# Cleanup
+rm -vf *.o *.elf *.hex
+
+# Compile
+/home/jpt/arduino-1.8.8/hardware/tools/avr/bin/avr-gcc -c -mmcu=atmega328p blink.c
+
+# Link
+/home/jpt/arduino-1.8.8/hardware/tools/avr/bin/avr-gcc -g -mmcu=atmega328p blink.o -o blink.elf
+
+# Convert hex
+/home/jpt/arduino-1.8.8/hardware/tools/avr/bin/avr-objcopy -j .text -j .data -O ihex blink.elf blink.hex
+
+# Upload
+avrdude -P /dev/ttyUSB0  -c arduino -p m328p -b 19200 -U flash:w:blink.hex