From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 13 May 2013 17:47:59 +0000 (+0300)
Subject: Fix an inline asm constraint
X-Git-Url: http://git.tdb.fi/?p=model-railway-devices.git;a=commitdiff_plain;h=39a8531ba664b0e39c781c94b0529d1f9431d4b6

Fix an inline asm constraint

The sbiw instruction is limited to certain word-capable registers, and the
compiler needs to be informed that such a register is needed.
---

diff --git a/common/delay.h b/common/delay.h
index 725d22b..9b81376 100644
--- a/common/delay.h
+++ b/common/delay.h
@@ -16,7 +16,7 @@ static inline void __attribute__((always_inline)) delay_loop16(uint16_t count)
 	__asm__ volatile (
 		"1: sbiw %0, 1" "\n\t"
 		"brne 1b"
-		: "=r" (count)
+		: "=w" (count)
 		: "0" (count)
 	);
 }