From 3c720a33274170db6e6c99a612a936bb2e094484 Mon Sep 17 00:00:00 2001
From: Giovanni Di Sirio <gdisirio@gmail.com>
Date: Thu, 23 Feb 2017 10:06:45 +0000
Subject: LSE bypass implemented on STM32F1xx.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@10110 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/hal/ports/STM32/STM32F1xx/hal_lld.c | 6 ++++++
 os/hal/ports/STM32/STM32F1xx/hal_lld.h | 1 +
 2 files changed, 7 insertions(+)

(limited to 'os')

diff --git a/os/hal/ports/STM32/STM32F1xx/hal_lld.c b/os/hal/ports/STM32/STM32F1xx/hal_lld.c
index 950eb3b5a..3893d6e70 100644
--- a/os/hal/ports/STM32/STM32F1xx/hal_lld.c
+++ b/os/hal/ports/STM32/STM32F1xx/hal_lld.c
@@ -66,7 +66,13 @@ static void hal_lld_backup_domain_init(void) {
 
   /* If enabled then the LSE is started.*/
 #if STM32_LSE_ENABLED
+#if defined(STM32_LSE_BYPASS)
+  /* LSE Bypass.*/
+  RCC->BDCR |= RCC_BDCR_LSEON | RCC_BDCR_LSEBYP;
+#else
+  /* No LSE Bypass.*/
   RCC->BDCR |= RCC_BDCR_LSEON;
+#endif
   while ((RCC->BDCR & RCC_BDCR_LSERDY) == 0)
     ;                                     /* Waits until LSE is stable.   */
 #endif /* STM32_LSE_ENABLED */
diff --git a/os/hal/ports/STM32/STM32F1xx/hal_lld.h b/os/hal/ports/STM32/STM32F1xx/hal_lld.h
index fff3c607b..32a63c875 100644
--- a/os/hal/ports/STM32/STM32F1xx/hal_lld.h
+++ b/os/hal/ports/STM32/STM32F1xx/hal_lld.h
@@ -20,6 +20,7 @@
  * @pre     This module requires the following macros to be defined in the
  *          @p board.h file:
  *          - STM32_LSECLK.
+ *          - STM32_LSE_BYPASS (optionally).
  *          - STM32_HSECLK.
  *          - STM32_HSE_BYPASS (optionally).
  *          .
-- 
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