From dbe46a961b80ff6d37dfd4238c2bd75a087daaf6 Mon Sep 17 00:00:00 2001
From: arighi <arighi@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Fri, 23 Apr 2010 15:37:26 +0000
Subject: [PATCH] lm3s1968: add a busy wait sleep when enabling or disabling
 the UART peripheral.

This is an enforcement to be sure the peripheral is actually enabled or
disabled on return from lm3s_uartEnable()/lm3s_uartDisable().

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@3513 38d2e660-2303-0410-9eaa-f027e97ec537
---
 bertos/cpu/cortex-m3/drv/ser_lm3s.c | 1 -
 bertos/cpu/cortex-m3/drv/ser_lm3s.h | 3 +++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/bertos/cpu/cortex-m3/drv/ser_lm3s.c b/bertos/cpu/cortex-m3/drv/ser_lm3s.c
index 717ffa58..b326a058 100644
--- a/bertos/cpu/cortex-m3/drv/ser_lm3s.c
+++ b/bertos/cpu/cortex-m3/drv/ser_lm3s.c
@@ -36,7 +36,6 @@
  */
 
 #include <cfg/macros.h> /* for BV() */
-#include <drv/clock_lm3s.h> /* lm3s_busyWait() */
 #include <drv/gpio_lm3s.h>
 #include <drv/ser_p.h>
 #include <drv/ser.h>
diff --git a/bertos/cpu/cortex-m3/drv/ser_lm3s.h b/bertos/cpu/cortex-m3/drv/ser_lm3s.h
index 27da414b..9485b1f8 100644
--- a/bertos/cpu/cortex-m3/drv/ser_lm3s.h
+++ b/bertos/cpu/cortex-m3/drv/ser_lm3s.h
@@ -40,6 +40,7 @@
 
 #include <cfg/cfg_debug.h>
 #include <cpu/power.h> /* cpu_relax() */
+#include <drv/clock_lm3s.h> /* lm3s_busyWait() */
 #include <io/lm3s.h>
 
 /* Serial hardware numbers */
@@ -76,6 +77,7 @@ INLINE void lm3s_uartDisable(uint32_t base)
 	/* Disable the UART */
 	HWREG(base + UART_O_CTL) &=
 		~(UART_CTL_UARTEN | UART_CTL_TXE | UART_CTL_RXE);
+	lm3s_busyWait(512);
 }
 
 INLINE void lm3s_uartEnable(uint32_t base)
@@ -86,6 +88,7 @@ INLINE void lm3s_uartEnable(uint32_t base)
 	/* Enable RX, TX, and the UART */
 	HWREG(base + UART_O_CTL) |=
 			UART_CTL_UARTEN | UART_CTL_TXE | UART_CTL_RXE;
+	lm3s_busyWait(512);
 }
 
 INLINE bool lm3s_uartTxDone(uint32_t base)
-- 
2.25.1