From 5b44d6a29a6ffc2b0ab46b73034d90a6bbbda946 Mon Sep 17 00:00:00 2001
From: maralvira <maralvira>
Date: Tue, 6 Jul 2010 13:39:34 +0000
Subject: [PATCH] properly drop characters when buffer is full

fix by David Kopf
---
 cpu/mc1322x/lib/uart1.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/cpu/mc1322x/lib/uart1.c b/cpu/mc1322x/lib/uart1.c
index cc64fa743..31b772dd2 100644
--- a/cpu/mc1322x/lib/uart1.c
+++ b/cpu/mc1322x/lib/uart1.c
@@ -30,7 +30,7 @@
  * This file is part of libmc1322x: see http://mc1322x.devl.org
  * for details. 
  *
- * $Id: uart1.c,v 1.1 2010/06/10 14:55:39 maralvira Exp $
+ * $Id: uart1.c,v 1.2 2010/07/06 13:39:34 maralvira Exp $
  */
 
 #include <mc1322x.h>
@@ -65,8 +65,9 @@ void uart1_putc(char c) {
 		u1_head += 1;
 		if (u1_head >= sizeof(u1_tx_buf))
 			u1_head = 0;
-		if (u1_head == u1_tail) /* drop chars when no room */
-			return;
+		if (u1_head == u1_tail) { /* drop chars when no room */
+			if (u1_head) { u1_head -=1; } else { u1_head = sizeof(u1_tx_buf); }
+		}
 		enable_irq(UART1);
 	}
 }