From ad8290460d4f252fde3fcf435e525268ea0854df Mon Sep 17 00:00:00 2001
From: gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Thu, 3 May 2012 17:38:29 +0000
Subject: [PATCH] Added an HSE bypass option to the STM32 clock initialization.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@4157 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/hal/platforms/STM32F1xx/hal_lld.c | 4 ++++
 os/hal/platforms/STM32F2xx/hal_lld.c | 4 ++++
 os/hal/platforms/STM32F4xx/hal_lld.c | 4 ++++
 os/hal/platforms/STM32L1xx/hal_lld.c | 4 ++++
 readme.txt                           | 3 +++
 5 files changed, 19 insertions(+)

diff --git a/os/hal/platforms/STM32F1xx/hal_lld.c b/os/hal/platforms/STM32F1xx/hal_lld.c
index 53bafb1b5..9fda0b3e7 100644
--- a/os/hal/platforms/STM32F1xx/hal_lld.c
+++ b/os/hal/platforms/STM32F1xx/hal_lld.c
@@ -215,6 +215,10 @@ void stm32_clock_init(void) {
     ;                                       /* Wait until HSI is the source.*/
 
 #if STM32_HSE_ENABLED
+#if defined(STM32_HSE_BYPASS)
+  /* HSE Bypass.*/
+  RCC->CR |= RCC_CR_HSEBYP;
+#endif
   /* HSE activation.*/
   RCC->CR |= RCC_CR_HSEON;
   while (!(RCC->CR & RCC_CR_HSERDY))
diff --git a/os/hal/platforms/STM32F2xx/hal_lld.c b/os/hal/platforms/STM32F2xx/hal_lld.c
index 75d217c69..8cfad815c 100644
--- a/os/hal/platforms/STM32F2xx/hal_lld.c
+++ b/os/hal/platforms/STM32F2xx/hal_lld.c
@@ -149,6 +149,10 @@ void stm32_clock_init(void) {
     ;                           /* Waits until HSI is stable.               */
 
 #if STM32_HSE_ENABLED
+#if defined(STM32_HSE_BYPASS)
+  /* HSE Bypass.*/
+  RCC->CR |= RCC_CR_HSEBYP;
+#endif
   /* HSE activation.*/
   RCC->CR |= RCC_CR_HSEON;
   while ((RCC->CR & RCC_CR_HSERDY) == 0)
diff --git a/os/hal/platforms/STM32F4xx/hal_lld.c b/os/hal/platforms/STM32F4xx/hal_lld.c
index 44de90602..8982da7b9 100644
--- a/os/hal/platforms/STM32F4xx/hal_lld.c
+++ b/os/hal/platforms/STM32F4xx/hal_lld.c
@@ -151,6 +151,10 @@ void stm32_clock_init(void) {
     ;                           /* Waits until HSI is stable.               */
 
 #if STM32_HSE_ENABLED
+#if defined(STM32_HSE_BYPASS)
+  /* HSE Bypass.*/
+  RCC->CR |= RCC_CR_HSEBYP;
+#endif
   /* HSE activation.*/
   RCC->CR |= RCC_CR_HSEON;
   while ((RCC->CR & RCC_CR_HSERDY) == 0)
diff --git a/os/hal/platforms/STM32L1xx/hal_lld.c b/os/hal/platforms/STM32L1xx/hal_lld.c
index 1d28df62b..43ba6832d 100644
--- a/os/hal/platforms/STM32L1xx/hal_lld.c
+++ b/os/hal/platforms/STM32L1xx/hal_lld.c
@@ -165,6 +165,10 @@ void stm32_clock_init(void) {
 #endif
 
 #if STM32_HSE_ENABLED
+#if defined(STM32_HSE_BYPASS)
+  /* HSE Bypass.*/
+  RCC->CR |= RCC_CR_HSEBYP;
+#endif
   /* HSE activation.*/
   RCC->CR |= RCC_CR_HSEON;
   while ((RCC->CR & RCC_CR_HSERDY) == 0)
diff --git a/readme.txt b/readme.txt
index 1bfe7fcdb..fef1cac36 100644
--- a/readme.txt
+++ b/readme.txt
@@ -117,6 +117,9 @@
   3484947)(backported to 2.4.1).
 - FIX: Fixed various minor documentation errors (bug 3484942)(backported
   to 2.4.1).
+- NEW: Added HSE oscillator bypass capability to the STM32 clock
+  initialization, it is enabled by adding STM32_HSE_BYPASS to your
+  board.h file.
 - NEW: Updated the MSP port to work with the latest MSPGCC compiler (4.6.3
   LTS 20120406 unpatched), now the old MSPGCC 3.2.3 is no more supported
   (backported to 2.4.1).