use avr-gcc for compilation

.gitignore

@@ -0,0 +1,3 @@
+*.elf
+*.o
+*.hex

Dockerfile

@@ -1,7 +1,7 @@
 FROM ubuntu
 MAINTAINER Kelvin Abrokwa ([email protected])
 RUN apt-get update
-RUN apt-get install -y --force-yes build-essential arduino arduino-core
+RUN apt-get install -y --force-yes gcc-avr binutils-avr avr-libc
 RUN mkdir /build
 ADD ./ /build
 WORKDIR /build

Makefile

@@ -1,6 +1,11 @@
 all:
-	arduino blink.uno
+	avr-gcc -g -Os -mmcu=atmega32 -c blink.c
+	avr-gcc -g -mmcu=atmega32 -o blink.elf blink.o
+	avr-objcopy -j .text -j .data -O ihex blink.elf blink.hex
 
 docker-build:
 	docker build -t firmware-builder .
 	docker run -it firmware-builder
+
+clean:
+	rm -f *.o *.elf *.hex

blink.c

@@ -0,0 +1,21 @@
+#ifndef F_CPU
+#define F_CPU 16000000UL // or whatever may be your frequency
+#endif
+
+#include <avr/io.h>
+#include <util/delay.h>                // for _delay_ms()
+
+int main(void)
+{
+    DDRC = 0x01;                       // initialize port C
+    while(1)
+    {
+        // LED on
+        PORTC = 0b00000001;            // PC0 = High = Vcc
+        _delay_ms(500);                // wait 500 milliseconds
+
+        //LED off
+        PORTC = 0b00000000;            // PC0 = Low = 0v
+        _delay_ms(500);                // wait 500 milliseconds
+    }
+}