stmhal: L4: Modify rtc.c to support L4 MCU.

stmhal/rtc.c

@@ -190,7 +190,11 @@ void rtc_init_finalise() {
 
     // fresh reset; configure RTC Calendar
     RTC_CalendarConfig();
+    #if defined(MCU_SERIES_L4)
+    if(__HAL_RCC_GET_FLAG(RCC_FLAG_BORRST) != RESET) {
+    #else
     if(__HAL_RCC_GET_FLAG(RCC_FLAG_PORRST) != RESET) {
+    #endif
         // power on reset occurred
         rtc_info |= 0x10000;
     }
@@ -223,7 +227,7 @@ STATIC HAL_StatusTypeDef PYB_RCC_OscConfig(RCC_OscInitTypeDef  *RCC_OscInitStruc
         HAL_PWR_EnableBkUpAccess();
         uint32_t tickstart = HAL_GetTick();
 
-        #if defined(MCU_SERIES_F7)
+        #if defined(MCU_SERIES_F7) || defined(MCU_SERIES_L4)
         //__HAL_RCC_PWR_CLK_ENABLE();
         // Enable write access to Backup domain
         //PWR->CR1 |= PWR_CR1_DBP;
@@ -293,7 +297,10 @@ STATIC HAL_StatusTypeDef PYB_RTC_Init(RTC_HandleTypeDef *hrtc) {
         // Exit Initialization mode
         hrtc->Instance->ISR &= (uint32_t)~RTC_ISR_INIT;
 
-        #if defined(MCU_SERIES_F7)
+        #if defined(MCU_SERIES_L4)
+        hrtc->Instance->OR &= (uint32_t)~RTC_OR_ALARMOUTTYPE;
+        hrtc->Instance->OR |= (uint32_t)(hrtc->Init.OutPutType);
+        #elif defined(MCU_SERIES_F7)
         hrtc->Instance->OR &= (uint32_t)~RTC_OR_ALARMTYPE;
         hrtc->Instance->OR |= (uint32_t)(hrtc->Init.OutPutType);
         #else
@@ -619,12 +626,21 @@ mp_obj_t pyb_rtc_wakeup(mp_uint_t n_args, const mp_obj_t *args) {
         RTC->WPR = 0xff;
 
         // enable external interrupts on line 22
+        #if defined(MCU_SERIES_L4)
+        EXTI->IMR1 |= 1 << 22;
+        EXTI->RTSR1 |= 1 << 22;
+        #else
         EXTI->IMR |= 1 << 22;
         EXTI->RTSR |= 1 << 22;
+        #endif
 
         // clear interrupt flags
         RTC->ISR &= ~(1 << 10);
+        #if defined(MCU_SERIES_L4)
+        EXTI->PR1 = 1 << 22;
+        #else
         EXTI->PR = 1 << 22;
+        #endif
 
         HAL_NVIC_SetPriority(RTC_WKUP_IRQn, IRQ_PRI_RTC_WKUP, IRQ_SUBPRI_RTC_WKUP);
         HAL_NVIC_EnableIRQ(RTC_WKUP_IRQn);
@@ -638,7 +654,11 @@ mp_obj_t pyb_rtc_wakeup(mp_uint_t n_args, const mp_obj_t *args) {
         RTC->WPR = 0xff;
 
         // disable external interrupts on line 22
+        #if defined(MCU_SERIES_L4)
+        EXTI->IMR1 &= ~(1 << 22);
+        #else
         EXTI->IMR &= ~(1 << 22);
+        #endif
     }
 
     return mp_const_none;