Merge pull request #3984 from mysterywolf/pr4

[bsp][stm32][bluepill] support RTC

bsp/stm32/stm32f103-blue-pill/board/CubeMX_Config/Inc/stm32f1xx_hal_conf.h

@@ -71,7 +71,7 @@
 /*#define HAL_HCD_MODULE_ENABLED   */
 /*#define HAL_PWR_MODULE_ENABLED   */
 /*#define HAL_RCC_MODULE_ENABLED   */
-/*#define HAL_RTC_MODULE_ENABLED   */
+#define HAL_RTC_MODULE_ENABLED
 /*#define HAL_SD_MODULE_ENABLED   */
 /*#define HAL_MMC_MODULE_ENABLED   */
 /*#define HAL_SDRAM_MODULE_ENABLED   */

bsp/stm32/stm32f103-blue-pill/board/Kconfig

@@ -38,7 +38,25 @@ menu "On-chip Peripheral Drivers"
                 depends on BSP_USING_UART1 && RT_SERIAL_USING_DMA
                 default n
         endif
+        
+    menuconfig BSP_USING_ONCHIP_RTC
+        bool "Enable RTC"
+        select RT_USING_RTC
+        select RT_USING_LIBC
+        default n
+        if BSP_USING_ONCHIP_RTC
+            choice
+                prompt "Select clock source"
+                default BSP_RTC_USING_LSE
+
+                config BSP_RTC_USING_LSE
+                    bool "RTC USING LSE"
 
+                config BSP_RTC_USING_LSI
+                    bool "RTC USING LSI"
+            endchoice
+        endif
+        
     menuconfig BSP_USING_SPI
         bool "Enable SPI BUS"
         default n