From 308b5c8f36f517f5c62cd037124982a45e7b5fa1 Mon Sep 17 00:00:00 2001
From: Marti Bolivar <mbolivar@leaflabs.com>
Date: Thu, 7 Apr 2011 23:10:50 -0400
Subject: USART fixups.

* usart_enable(): Doxygen comment bugfix.

* usart_disable(): previously, usart_disable() would nuke the
  entire CR1 register just to clear the UE bit.
---
 libmaple/usart.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'libmaple')

diff --git a/libmaple/usart.c b/libmaple/usart.c
index df5e2c5..de808a7 100644
--- a/libmaple/usart.c
+++ b/libmaple/usart.c
@@ -120,7 +120,7 @@ void usart_set_baud_rate(usart_dev *dev, uint32 clock_speed, uint32 baud) {
  * @brief Enable a serial port.
  *
  * USART is enabled in single buffer transmission mode, multibuffer
- * receiver mode, at the given baud rate, 8n1.
+ * receiver mode, 8n1.
  *
  * Serial port must have a baud rate configured to work properly.
  *
@@ -146,7 +146,7 @@ void usart_disable(usart_dev *dev) {
         ;
 
     /* Disable UE */
-    regs->CR1 = 0;
+    regs->CR1 &= ~USART_CR1_UE;
 
     /* Clean up buffer */
     usart_reset_rx(dev);
-- 
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