From ece59fba75103c038d8bd79f90cd27ac56bf330c Mon Sep 17 00:00:00 2001
From: Rocco Marco Guglielmi <roccomarco.guglielmi@live.com>
Date: Wed, 6 Jul 2016 14:05:22 +0000
Subject: [PATCH] Fixed Bug #763.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/stable_16.1.x@9683 35acf78f-673a-0410-8e92-d51de3d6d3f4
---
 os/hal/ports/STM32/STM32L4xx/hal_lld.c | 21 +++++++++++++++++++++
 readme.txt                             |  3 ++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/os/hal/ports/STM32/STM32L4xx/hal_lld.c b/os/hal/ports/STM32/STM32L4xx/hal_lld.c
index 8277a8600..7ad91c7fe 100644
--- a/os/hal/ports/STM32/STM32L4xx/hal_lld.c
+++ b/os/hal/ports/STM32/STM32L4xx/hal_lld.c
@@ -59,6 +59,27 @@ static void hal_lld_backup_domain_init(void) {
     RCC->BDCR = RCC_BDCR_BDRST;
     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
diff --git a/readme.txt b/readme.txt
index f7f7735e5..2abe798c4 100644
--- a/readme.txt
+++ b/readme.txt
@@ -71,7 +71,8 @@
 *****************************************************************************
 *** Releases and Change Log                                               ***
 *****************************************************************************
-
+*** 16.1.6 ***
+- HAL: Fixed wrong backup domain reset in STM32L4xx\hal_lld (bug #763).
 *** 16.1.5 ***
 - NEW: Added support for more Nucleo and Discovery boards.
 - HAL: Board files regenerated using the latest version of the generator