[First construction]

.gitignore

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

build.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/zsh
+avr-as -mmcu=atmega328p -o main.o main.s
+avr-ld -o main.elf main.o
+avr-objcopy -O ihex main.elf main.hex

flash.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/zsh
+DEVICE=/dev/ttyACM0
+sudo avrdude -p m328p -c arduino -P $DEVICE -U flash:w:main.hex

main.s

@@ -0,0 +1,38 @@
+.equ DDRB, 0x04
+.equ PORTB, 0x05
+
+.global main
+
+main:
+	ldi r16, 1
+	out DDRB, r16
+	ldi r16, 0
+	out PORTB, r16
+loop_start:
+	com r16
+	out PORTB, r16
+init_sleep:
+	ldi r18, 0xFF
+	ldi r19, 0xFF
+	ldi r20, 0xFF
+sleep_outer:
+	cpi r18, 0x00
+	breq loop_start
+	dec r18
+	rjmp sleep_inner1
+sleep_inner0:
+	cpi r19, 0
+	breq sleep_inner0_reset
+	dec r19
+	rjmp sleep_inner1
+sleep_inner0_reset:
+	ldi r19, 0xFF
+	rjmp sleep_outer
+sleep_inner1:
+	cpi r20, 0
+	breq sleep_inner1_reset
+	dec r20
+	rjmp sleep_inner1
+sleep_inner1_reset:
+	ldi r20, 0x1F
+	rjmp sleep_inner0

readme.md

@@ -0,0 +1,12 @@
+# ATMega328P Blinking LED Assembly
+
+Toggle a LED about every second with 20MHz.
+
+## Breadboard structure
+
+PIN8 > LED > 220Ohm Resistor > GND
+
+## Used packages (Linux)
+
+- avr-binutils
+- avrdude