From 3e58b1940f1449f36f1b6a99a7335313a725fcf3 Mon Sep 17 00:00:00 2001
From: "bernard.xiong" <bernard.xiong@gmail.com>
Date: Thu, 20 Aug 2009 05:45:18 +0000
Subject: [PATCH] fix the returned value of rt_serial_getc function which is
 reported by macroz.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@24 bbd45198-f89e-11dd-88c7-29a3b14d5316
---
 libcpu/arm/stm32/serial.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libcpu/arm/stm32/serial.c b/libcpu/arm/stm32/serial.c
index 41f8e74a90..3140a8446a 100644
--- a/libcpu/arm/stm32/serial.c
+++ b/libcpu/arm/stm32/serial.c
@@ -27,10 +27,10 @@ static void rt_serial_enable_dma(DMA_Channel_TypeDef* dma_channel,
  *
  * @return the read char
  */
-char rt_serial_getc(struct stm32_serial_device* uart)
+int rt_serial_getc(struct stm32_serial_device* uart)
 {
 	rt_base_t level;
-	char ch = 0;
+	int ch = -1;
 	
 	/* disable interrupt */
 	level = rt_hw_interrupt_disable();