Merge pull request #15034 from world-direct/feature/stm32f1_rtcHSE

add RTC using HSE to target STM32F1

Author: 0xc0170

targets/TARGET_STM/mbed_overrides.c

@@ -292,7 +292,11 @@ void mbed_sdk_init()
 #if (MBED_CONF_TARGET_RTC_CLOCK_SOURCE == USE_RTC_CLK_HSE)
     RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
     PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
+#if defined(RCC_RTCCLKSOURCE_HSE_DIVX)
     PeriphClkInitStruct.RTCClockSelection = (RCC_RTCCLKSOURCE_HSE_DIVX | RTC_HSE_DIV << 16);
+#else
+    PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_HSE_DIV128;
+#endif
     if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
         error("PeriphClkInitStruct RTC failed with HSE\n");
     }

targets/TARGET_STM/rtc_api.c

@@ -65,7 +65,11 @@ void rtc_init(void)
 #if (MBED_CONF_TARGET_RTC_CLOCK_SOURCE == USE_RTC_CLK_HSE)
     (void)RCC_OscInitStruct;
     PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
+#if defined(RCC_RTCCLKSOURCE_HSE_DIVX)
     PeriphClkInitStruct.RTCClockSelection = (RCC_RTCCLKSOURCE_HSE_DIVX | RTC_HSE_DIV << 16);
+#else
+    PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_HSE_DIV128;
+#endif
     if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
         error("PeriphClkInitStruct RTC failed with HSE\n");
     }

targets/TARGET_STM/rtc_api_hal.h

@@ -47,7 +47,7 @@ extern "C" {
 #error "RTC clock configuration is invalid!"
 #endif
 
-#if (MBED_CONF_TARGET_RTC_CLOCK_SOURCE == USE_RTC_CLK_HSE) && !(TARGET_STM32F2 || TARGET_STM32F4 || TARGET_STM32F7)
+#if (MBED_CONF_TARGET_RTC_CLOCK_SOURCE == USE_RTC_CLK_HSE) && !(TARGET_STM32F2 || TARGET_STM32F4 || TARGET_STM32F7 || TARGET_STM32F1)
 #error "RTC from HSE not supported for this target"
 #endif