From 6ac8185c0885dc09b39cb8dc75b5d35eecdf7f8f Mon Sep 17 00:00:00 2001
From: Matthijs Kooijman <matthijs@stdin.nl>
Date: Sun, 1 Dec 2013 19:18:31 +0100
Subject: [PATCH] Define a _NOP() macro

Recent avr-libc releases define one, but this allows using it also on
older avr-libc releases.
---
 hardware/arduino/avr/cores/arduino/Arduino.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hardware/arduino/avr/cores/arduino/Arduino.h b/hardware/arduino/avr/cores/arduino/Arduino.h
index 7bf51193a..8502e4484 100644
--- a/hardware/arduino/avr/cores/arduino/Arduino.h
+++ b/hardware/arduino/avr/cores/arduino/Arduino.h
@@ -88,6 +88,10 @@ void yield(void);
 #define bitClear(value, bit) ((value) &= ~(1UL << (bit)))
 #define bitWrite(value, bit, bitvalue) (bitvalue ? bitSet(value, bit) : bitClear(value, bit))
 
+// avr-libc defines _NOP() since 1.6.2
+#ifndef _NOP
+#define _NOP() do { __asm__ volatile ("nop"); } while (0)
+#endif
 
 typedef unsigned int word;