From ce16a16f73a267a5ca6dd0fdd9ccd1d584fff00e Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Sat, 11 Jun 2011 14:31:13 -0300
Subject: [PATCH] atusb/fw/atusb.c (main): sleep (idle mode) while waiting for
 interrupts

This saves about 2 mA, leaving about 8 mA when idle. The transceiver
should consume 0.5 mA in TRX_OFF, CLKM up to 4 mA, and the idle MCU
core 1 mA. USB current is unknown.
---
 atusb/fw/atusb.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/atusb/fw/atusb.c b/atusb/fw/atusb.c
index 0244713..6264d7c 100644
--- a/atusb/fw/atusb.c
+++ b/atusb/fw/atusb.c
@@ -14,6 +14,7 @@
 #include <stdint.h>
 
 #include <avr/io.h>
+#include <avr/sleep.h>
 #include <avr/interrupt.h>
 
 #include "usb.h"
@@ -43,5 +44,6 @@ int main(void)
 
 	sei();
 
-	while (1);
+	while (1)
+		sleep_mode();
 }