init. works.

Makefile

@@ -0,0 +1,25 @@
+
+
+
+MMCU=atmega32u4
+MMCU_DUDE=m32u4
+.PHONY: all clean
+
+all: flash
+
+compile:
+	avr-gcc -g -Os -mmcu=$(MMCU) -c led.c
+
+link: compile
+	avr-gcc -g -mmcu=$(MMCU) -o led.elf led.o
+
+assemble: link
+	avr-objcopy -j .text -j .data -O ihex led.elf led.hex
+
+flash: assemble
+	avrdude -p $(MMCU_DUDE) -c stk500 -P /dev/cu.usbserial-1220 -U flash:w:led.hex:i
+
+clean:
+	rm *.o
+	rm *.elf
+	rm *.hex

README.md

@@ -1,2 +1,2 @@
-# 32u4-seq
+
 

led.c

@@ -0,0 +1,18 @@
+#ifndef F_CPU
+#define F_CPU 16000000UL // or whatever may be your frequency
+#endif
+
+#include <avr/io.h>
+//#include <avr/uart.h>
+#include <util/delay.h> // for _delay_ms()
+
+int main(void) {
+  DDRD = 0xff;
+  while (1) {
+    PORTD = 0xff;
+    _delay_ms(100);
+
+    PORTD = 0x00;
+    _delay_ms(100);
+  }
+}