Prevent lockup on boot in case of 32kHz oscillator failure (fix #5294)

2017-11-08 13:02:32 +01:00
parent e2858dbb03
commit fdec738485
1 changed files with 9 additions and 1 deletions
@@ -64,7 +64,15 @@ void rtcInit()
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
  PWR_BackupAccessCmd(ENABLE);
  RCC_LSEConfig(RCC_LSE_ON);
-  while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET);
+  
+  // Prevent lockup in case of 32kHz oscillator failure
+  uint32_t i = 0;
+  while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
+  {
+    if ( ++i > 1000000 )
+      return;
+  }
+  
  RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
  RCC_RTCCLKCmd(ENABLE);
  RTC_WaitForSynchro();