diff --git a/uart/fw/Makefile b/uart/fw/Makefile
new file mode 100644
index 0000000..1e9f50c
--- /dev/null
+++ b/uart/fw/Makefile
@@ -0,0 +1,25 @@
+CFLAGS = -g -Wall -Wshadow -Werror \
+	 -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations
+
+CHIP=atmega48
+
+AVR_PREFIX = $(BIN_PATH) avr-
+CC = $(AVR_PREFIX)gcc
+OBJCOPY = $(AVR_PREFIX)objcopy
+#OBJDUMP = $(AVR_PREFIX)objdump
+
+.PHONY:	all upload prog
+
+all:	uart.bin
+
+%.elf:	%.c
+	$(CC) -mmcu=$(CHIP) -Os -o $@ $<
+
+%.bin:	%.elf
+	$(OBJCOPY) -j .text -j .data -O binary $< $@
+
+upload:	uart.bin
+	scp uart.bin jlime:
+
+prog:
+	ssh jlime avrdude -p atmega48 -c nanonote_uart -e -U flash:w:uart.bin:r
diff --git a/uart/fw/uart.c b/uart/fw/uart.c
new file mode 100644
index 0000000..7ea119f
--- /dev/null
+++ b/uart/fw/uart.c
@@ -0,0 +1,19 @@
+#include <stdint.h>
+
+#include <avr/io.h>
+
+#define	F_CPU	1000000UL
+#include <util/delay.h>
+
+
+#define	LED	2	/* PD2 */
+
+
+int main(void)
+{
+	DDRD = 1 << LED;
+	while (1) {
+		PORTD ^= 1 << LED;
+		_delay_ms(50);
+	}
+}