[L5] support the stm32L5 soc with low power modes

Signed-off-by: Francois Ramu <francois.ramu@st.com>

Author: FRASTM

src/STM32LowPower.cpp

@@ -188,8 +188,8 @@ void STM32LowPower::programRtcWakeUp(uint32_t ms, LP_Mode lp_mode)
       break;
     default:
     case SHUTDOWN_MODE:
-#ifdef STM32L4xx
-      // For shutdown mode LSE have to be used (STM32L4 series only)
+#if defined(STM32L4xx) || defined(STM32L5xx)
+      // For shutdown mode LSE have to be used (STM32L4 or STM32L5 series only)
       clkSrc = STM32RTC::LSE_CLOCK;
 #else
       // LSE or LSI

src/low_power.c

@@ -231,7 +231,7 @@ void LowPower_stop(serial_t *obj)
 #endif
 
   /* Enter Stop mode */
-#if defined(STM32L4xx)
+#if defined(STM32L4xx) || defined(STM32L5xx)
   if ((WakeUpUart == NULL) || (WakeUpUart->Instance == (USART_TypeDef *)LPUART1_BASE)) {
     // STM32L4xx supports STOP2 mode which halves consumption
     HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);
@@ -290,7 +290,7 @@ void LowPower_standby()
 void LowPower_shutdown()
 {
   __disable_irq();
-#ifdef STM32L4xx
+#if defined(STM32L4xx) || defined(STM32L5xx)
   /* LSE must be on to use shutdown mode */
   if (__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) == SET) {
     HAL_PWREx_EnterSHUTDOWNMode();