From 53055a4b73bdad4f7c0e8b0bfbe34fdffc70361e Mon Sep 17 00:00:00 2001
From: Rocco Marco Guglielmi <roccomarco.guglielmi@live.com>
Date: Wed, 6 Jul 2016 14:05:57 +0000
Subject: Fixed Bug #763.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@9684 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/hal/ports/STM32/STM32L4xx/hal_lld.c | 23 ++++++++++++++++++++++-
 readme.txt                             |  2 ++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/os/hal/ports/STM32/STM32L4xx/hal_lld.c b/os/hal/ports/STM32/STM32L4xx/hal_lld.c
index 4eea068c9..c4916b8af 100644
--- a/os/hal/ports/STM32/STM32L4xx/hal_lld.c
+++ b/os/hal/ports/STM32/STM32L4xx/hal_lld.c
@@ -48,7 +48,7 @@ uint32_t SystemCoreClock = STM32_HCLK;
 
 /**
  * @brief   Initializes the backup domain.
- * @note    WARNING! Changing clock source impossible without resetting
+ * @note    WARNING! Changing RTC clock source impossible without resetting
  *          of the whole BKP domain.
  */
 static void hal_lld_backup_domain_init(void) {
@@ -60,6 +60,27 @@ static void hal_lld_backup_domain_init(void) {
     RCC->BDCR = 0;
   }
 
+#if STM32_LSE_ENABLED
+  /* LSE activation.*/
+#if defined(STM32_LSE_BYPASS)
+  /* LSE Bypass.*/
+  RCC->BDCR |= STM32_LSEDRV | RCC_BDCR_LSEON | RCC_BDCR_LSEBYP;
+#else
+  /* No LSE Bypass.*/
+  RCC->BDCR |= STM32_LSEDRV | RCC_BDCR_LSEON;
+#endif
+  while ((RCC->BDCR & RCC_BDCR_LSERDY) == 0)
+    ;                                       /* Wait until LSE is stable.    */
+#endif
+
+#if STM32_MSIPLL_ENABLED
+  /* MSI PLL activation depends on LSE. Reactivating and checking for
+     MSI stability.*/
+  RCC->CR |= RCC_CR_MSIPLLEN;
+  while ((RCC->CR & RCC_CR_MSIRDY) == 0)
+    ;                                       /* Wait until MSI is stable.    */
+#endif
+  
 #if HAL_USE_RTC
   /* If the backup domain hasn't been initialized yet then proceed with
      initialization.*/
diff --git a/readme.txt b/readme.txt
index bea561828..e7570882c 100644
--- a/readme.txt
+++ b/readme.txt
@@ -120,6 +120,8 @@
 - RT:  Merged RT4.
 - NIL: Merged NIL2.
 - NIL: Added STM32F7 demo.
+- HAL: Fixed wrong backup domain reset in STM32L4xx\hal_lld (bug #763)
+       (backported to 16.1.6).
 - HAL: Fixed wrong PWR configurations in STM32L4xx\hal_lld (bug #761)
        (backported to 16.1.5).
 - HAL: Fixed wrong comment in STM32L4xx\hal_lld (bug #760)
-- 
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