RTCv1. Fixed possible false detect of loaded prescaler (bug 3595489)

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/stable_2.4.x@4910 35acf78f-673a-0410-8e92-d51de3d6d3f4

os/hal/platforms/STM32F1xx/hal_lld.c

@@ -80,11 +80,11 @@ static void hal_lld_backup_domain_init(void) {
     /* Selects clock source.*/
     RCC->BDCR |= STM32_RTCSEL;
 
-    /* RTC clock enabled.*/
-    RCC->BDCR |= RCC_BDCR_RTCEN;
-
     /* Prescaler value loaded in registers.*/
     rtc_lld_set_prescaler();
+
+    /* RTC clock enabled.*/
+    RCC->BDCR |= RCC_BDCR_RTCEN;
   }
 #endif /* STM32_RTCSEL != STM32_RTCSEL_NOCLOCK */
 #endif /* HAL_USE_RTC */

readme.txt

@@ -79,6 +79,8 @@
 *****************************************************************************
 
 *** 2.4.3 ***
+- FIX: Possible false detect of loaded prescaler in RTCv1 driver (bug 
+  3595489) 
 - FIX: Unneded RTC initialization when HAL_USE_RTC disabled (bug 3594620).
 - FIX: Compilation issue with HAL_USE_RTC disabled (bug 3594083).
 - FIX: Wasting of BKP registers in RTCv1 driver (bug 3594005).