[X9D] Buffer overflow in BMP code

[X9D] External clock for RTC

src/x9d/rtc_driver.cpp

@@ -72,7 +72,7 @@ void rtc_init()
 	RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
 	PWR_BackupAccessCmd(ENABLE);
 	
-	RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
+	RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
 	RCC_RTCCLKCmd(ENABLE);
 	
 	RTC_InitStruct.RTC_HourFormat = RTC_HourFormat_24;