diff --git a/cores/arduino/HardwareSerial.cpp b/cores/arduino/HardwareSerial.cpp
index 9f24275905..6177980390 100644
--- a/cores/arduino/HardwareSerial.cpp
+++ b/cores/arduino/HardwareSerial.cpp
@@ -182,6 +182,16 @@ void HardwareSerial::init(void)
   _serial.tx_tail = 0;
 }
 
+void HardwareSerial::configForLowPower(void)
+{
+#if defined(HAL_PWR_MODULE_ENABLED) && defined(UART_IT_WUF)
+  // Reconfigure properly Serial instance to use HSI as clock source
+  end();
+  uart_config_lowpower(&_serial);
+  begin(_serial.baudrate, _config);
+#endif
+}
+
 // Actual interrupt handlers //////////////////////////////////////////////////////////////
 
 void HardwareSerial::_rx_complete_irq(serial_t* obj)
@@ -226,6 +236,7 @@ void HardwareSerial::begin(unsigned long baud, byte config)
   uint32_t databits = 0;
 
   _serial.baudrate = (uint32_t)baud;
+  _config = config;
 
   // Manage databits
   switch(config & 0x07) {
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index 81a48add5f..dff7163745 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -125,11 +125,15 @@ class HardwareSerial : public Stream
     void setRx(PinName _rx);
     void setTx(PinName _tx);
 
+    friend class STM32LowPower;
+
     // Interrupt handlers
     static void _rx_complete_irq(serial_t* obj);
     static int _tx_complete_irq(serial_t* obj);
   private:
+    uint8_t _config;
     void init(void);
+    void configForLowPower(void);
 };
 
 extern HardwareSerial Serial1;
diff --git a/cores/arduino/board.h b/cores/arduino/board.h
index 3ca81179e2..00e207e62a 100644
--- a/cores/arduino/board.h
+++ b/cores/arduino/board.h
@@ -14,6 +14,7 @@ extern "C"{
 #include "digital_io.h"
 #include "hal_uart_emul.h"
 #include "hw_config.h"
+#include "low_power.h"
 #include "rtc.h"
 #include "spi_com.h"
 #include "stm32_eeprom.h"
diff --git a/cores/arduino/stm32/PinNames.h b/cores/arduino/stm32/PinNames.h
index e1ed2e7dd4..d860db33a5 100644
--- a/cores/arduino/stm32/PinNames.h
+++ b/cores/arduino/stm32/PinNames.h
@@ -9,7 +9,10 @@ extern "C" {
 #endif
 
 typedef enum {
+    // Not connected
+    NC = (int)0xFFFFFFFF,
 
+    // Pin name definition
     PA_0  = (PortA << 4) + 0x00,
     PA_1  = (PortA << 4) + 0x01,
     PA_2  = (PortA << 4) + 0x02,
@@ -205,8 +208,11 @@ typedef enum {
     PK_14 = (PortK << 4) + 0x0E,
     PK_15 = (PortK << 4) + 0x0F,
 #endif
-    // Not connected
-    NC = (int)0xFFFFFFFF
+// Specific pin name define in the variant
+#if __has_include("PinNamesVar.h")
+#include "PinNamesVar.h"
+#endif
+    P_END = NC
 } PinName;
 
 #ifdef __cplusplus
diff --git a/cores/arduino/stm32/low_power.c b/cores/arduino/stm32/low_power.c
new file mode 100644
index 0000000000..1b47663068
--- /dev/null
+++ b/cores/arduino/stm32/low_power.c
@@ -0,0 +1,332 @@
+/**
+  ******************************************************************************
+  * @file    LowPower.c
+  * @author  WI6LABS
+  * @version V1.0.0
+  * @date    17 - November -2017
+  * @brief   Provides a Low Power interface
+  *
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+#include "Arduino.h"
+#include "low_power.h"
+
+#ifdef HAL_PWR_MODULE_ENABLED
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#ifdef UART_IT_WUF
+/* Save UART handler for callback */
+static UART_HandleTypeDef* WakeUpUart = NULL;
+#endif
+/* Save callback pointer */
+static void (*WakeUpUartCb)( void ) = NULL;
+
+/**
+  * @brief  Initialize low power mode
+  * @param  None
+  * @retval None
+  */
+void LowPower_init(){
+  /* Enable Power Clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+  /* Allow access to Backup domain */
+  HAL_PWR_EnableBkUpAccess();
+
+  /* Reset RTC Domain */
+  __HAL_RCC_BACKUPRESET_FORCE();
+  __HAL_RCC_BACKUPRESET_RELEASE();
+
+#ifdef __HAL_RCC_WAKEUPSTOP_CLK_CONFIG
+  /* Ensure that HSI is wake-up system clock */
+  __HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_STOP_WAKEUPCLOCK_HSI);
+#endif
+  /* Check if the system was resumed from StandBy mode */
+  if (__HAL_PWR_GET_FLAG(PWR_FLAG_SB) != RESET)
+  {
+    /* Clear Standby flag */
+    __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);
+  }
+
+  /* Clear all related wakeup flags */
+  __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
+}
+
+/**
+  * @brief  Configure a pin as wakeup source if compatible.
+  * @param  pin: pin to configure
+  * @param  mode: pin mode (edge or state). The configuration have to be compatible.
+  * @retval None
+  */
+void LowPower_EnableWakeUpPin(uint32_t pin, uint32_t mode) {
+#if !defined(PWR_WAKEUP_PIN1_HIGH)
+  UNUSED(mode);
+#endif
+  uint32_t wkup_pin;
+  PinName p = digitalPinToPinName(pin);
+  if (p != NC) {
+    switch (p) {
+      default :
+#ifdef PWR_WAKEUP_PIN1
+      case SYS_WKUP1 :
+        wkup_pin = PWR_WAKEUP_PIN1;
+#ifdef PWR_WAKEUP_PIN1_HIGH
+        if (mode != RISING) {
+          wkup_pin = PWR_WAKEUP_PIN1_LOW;
+        }
+#endif
+        break;
+#endif /* PWR_WAKEUP_PIN1 */
+#ifdef PWR_WAKEUP_PIN2
+      case SYS_WKUP2 :
+        wkup_pin = PWR_WAKEUP_PIN2;
+#ifdef PWR_WAKEUP_PIN2_HIGH
+        if (mode != RISING) {
+          wkup_pin = PWR_WAKEUP_PIN2_LOW;
+        }
+#endif
+        break;
+#endif /* PWR_WAKEUP_PIN2 */
+#ifdef PWR_WAKEUP_PIN3
+      case SYS_WKUP3 :
+        wkup_pin = PWR_WAKEUP_PIN3;
+#ifdef PWR_WAKEUP_PIN3_HIGH
+        if (mode != RISING) {
+          wkup_pin = PWR_WAKEUP_PIN3_LOW;
+        }
+#endif
+        break;
+#endif /* PWR_WAKEUP_PIN3 */
+#ifdef PWR_WAKEUP_PIN4
+      case SYS_WKUP4 :
+        wkup_pin = PWR_WAKEUP_PIN4;
+#ifdef PWR_WAKEUP_PIN4_HIGH
+        if (mode != RISING) {
+          wkup_pin = PWR_WAKEUP_PIN4_LOW;
+        }
+#endif
+        break;
+#endif /* PWR_WAKEUP_PIN4 */
+#ifdef PWR_WAKEUP_PIN5
+      case SYS_WKUP5 :
+        wkup_pin = PWR_WAKEUP_PIN5;
+#ifdef PWR_WAKEUP_PIN5_HIGH
+        if (mode != RISING) {
+          wkup_pin = PWR_WAKEUP_PIN5_LOW;
+        }
+#endif
+        break;
+#endif /* PWR_WAKEUP_PIN5 */
+#ifdef PWR_WAKEUP_PIN6
+      case SYS_WKUP6 :
+        wkup_pin = PWR_WAKEUP_PIN6;
+#ifdef PWR_WAKEUP_PIN6_HIGH
+        if (mode != RISING) {
+          wkup_pin = PWR_WAKEUP_PIN6_LOW;
+        }
+#endif
+        break;
+#endif /* PWR_WAKEUP_PIN6 */
+#ifdef PWR_WAKEUP_PIN7
+      case SYS_WKUP7 :
+        wkup_pin = PWR_WAKEUP_PIN7;
+        break;
+#endif /* PWR_WAKEUP_PIN7 */
+#ifdef PWR_WAKEUP_PIN8
+      case SYS_WKUP8 :
+        wkup_pin = PWR_WAKEUP_PIN8;
+        break;
+#endif /* PWR_WAKEUP_PIN8 */
+    }
+    HAL_PWR_EnableWakeUpPin(wkup_pin);
+  }
+}
+
+/**
+  * @brief  Enable the sleep mode.
+  * @param  None
+  * @retval None
+  */
+void LowPower_sleep(uint32_t regulator){
+  /*
+   * Suspend Tick increment to prevent wakeup by Systick interrupt.
+   * Otherwise the Systick interrupt will wake up the device within
+   * 1ms (HAL time base)
+   */
+  HAL_SuspendTick();
+
+  /* Enter Sleep Mode , wake up is done once User push-button is pressed */
+  HAL_PWR_EnterSLEEPMode(regulator, PWR_SLEEPENTRY_WFI);
+
+  /* Resume Tick interrupt if disabled prior to SLEEP mode entry */
+  HAL_ResumeTick();
+
+  if (WakeUpUartCb != NULL) {
+    WakeUpUartCb();
+  }
+}
+
+/**
+  * @brief  Enable the stop mode.
+  * @param  obj : pointer to serial_t structure
+  * @retval None
+  */
+void LowPower_stop(serial_t *obj){
+  __disable_irq();
+
+#ifdef UART_IT_WUF
+  if (WakeUpUart != NULL) {
+    HAL_UARTEx_EnableStopMode(WakeUpUart);
+  }
+#endif
+
+#if defined(STM32L0xx) || defined(STM32L1xx)
+  /* Enable Ultra low power mode */
+  HAL_PWREx_EnableUltraLowPower();
+
+  /* Enable the fast wake up from Ultra low power mode */
+  HAL_PWREx_EnableFastWakeUp();
+#endif
+#ifdef __HAL_RCC_WAKEUPSTOP_CLK_CONFIG
+  /* Select HSI as system clock source after Wake Up from Stop mode */
+  __HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_STOP_WAKEUPCLOCK_HSI);
+#endif
+
+  /* Enter Stop mode */
+  HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
+
+  /* Exit Stop mode reset clocks */
+  SystemClock_Config();
+#ifdef UART_IT_WUF
+  if (WakeUpUart != NULL) {
+    /* In case of WakeUp from UART, reset its clock source to HSI */
+    uart_config_lowpower(obj);
+    HAL_UARTEx_DisableStopMode(WakeUpUart);
+  }
+#else
+  UNUSED(obj);
+#endif
+  __enable_irq();
+
+  HAL_Delay(10);
+
+  if (WakeUpUartCb != NULL) {
+    WakeUpUartCb();
+  }
+}
+
+/**
+  * @brief  Enable the standby mode. The board reset when leaves this mode.
+  * @param  None
+  * @retval None
+  */
+void LowPower_standby(){
+  __disable_irq();
+
+#if defined(STM32L0xx) || defined(STM32L1xx)
+  /* Enable Ultra low power mode */
+  HAL_PWREx_EnableUltraLowPower();
+
+  /* Enable the fast wake up from Ultra low power mode */
+  HAL_PWREx_EnableFastWakeUp();
+#endif
+
+  HAL_PWR_EnterSTANDBYMode();
+}
+
+/**
+  * @brief  Enable the shutdown mode.The board reset when leaves this mode.
+  *         If shutdown mode not available, use standby mode instead.
+  * @param  None
+  * @retval None
+  */
+void LowPower_shutdown(){
+  __disable_irq();
+#ifdef STM32L4xx
+  /* LSE must be on to use shutdown mode */
+  if(__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) == SET) {
+    HAL_PWREx_EnterSHUTDOWNMode();
+  } else
+#endif
+  {
+    LowPower_standby();
+  }
+}
+
+/**
+  * @brief  Configure the UART as a wakeup source. A callback can be called when
+  *         the chip leaves the low power mode. See board datasheet to check
+  *         with which low power mode the UART is compatible.
+  * Warning This function will change UART clock source to HSI
+  * @param  serial: pointer to serial
+  * @param  FuncPtr: pointer to callback
+  * @retval None
+  */
+void LowPower_EnableWakeUpUart(serial_t* serial, void (*FuncPtr)( void ) ) {
+#ifdef UART_IT_WUF
+  UART_WakeUpTypeDef WakeUpSelection;
+  if(serial == NULL) {
+    return;
+  }
+  /* Save Uart handler and Serial object */
+  WakeUpUart = &(serial->handle);
+
+  /* make sure that no UART transfer is on-going */
+  while(__HAL_UART_GET_FLAG(WakeUpUart, USART_ISR_BUSY) == SET);
+  /* make sure that UART is ready to receive
+   * (test carried out again later in HAL_UARTEx_StopModeWakeUpSourceConfig) */
+  while(__HAL_UART_GET_FLAG(WakeUpUart, USART_ISR_REACK) == RESET);
+
+  /* set the wake-up event:
+   * specify wake-up on RXNE flag
+   */
+  WakeUpSelection.WakeUpEvent = UART_WAKEUP_ON_READDATA_NONEMPTY;
+  HAL_UARTEx_StopModeWakeUpSourceConfig(WakeUpUart, WakeUpSelection);
+
+  /* Enable the UART Wake UP from STOP1 mode Interrupt */
+  __HAL_UART_ENABLE_IT(WakeUpUart, UART_IT_WUF);
+#else
+  UNUSED(serial);
+#endif
+  /* Save callback */
+  WakeUpUartCb = FuncPtr;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/cores/arduino/stm32/low_power.h b/cores/arduino/stm32/low_power.h
new file mode 100644
index 0000000000..81d5baf136
--- /dev/null
+++ b/cores/arduino/stm32/low_power.h
@@ -0,0 +1,71 @@
+/**
+  ******************************************************************************
+  * @file    LowPower.h
+  * @author  WI6LABS
+  * @version V1.0.0
+  * @date    17 - November -2017
+  * @brief   Header for Low Power module
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __LOW_POWER_H
+#define __LOW_POWER_H
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32_def.h"
+#include "uart.h"
+
+#ifdef HAL_PWR_MODULE_ENABLED
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+/* Exported macro ------------------------------------------------------------*/
+/* Exported functions ------------------------------------------------------- */
+
+void LowPower_init();
+void LowPower_EnableWakeUpPin(uint32_t pin, uint32_t mode);
+void LowPower_EnableWakeUpUart(serial_t* serial, void (*FuncPtr)( void ) );
+void LowPower_sleep(uint32_t regulator);
+void LowPower_stop(serial_t *obj);
+void LowPower_standby();
+void LowPower_shutdown();
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* HAL_PWR_MODULE_ENABLED */
+
+#endif /* __LOW_POWER_H */
diff --git a/cores/arduino/stm32/rtc.c b/cores/arduino/stm32/rtc.c
index 562d09110e..7e7d2fabcc 100644
--- a/cores/arduino/stm32/rtc.c
+++ b/cores/arduino/stm32/rtc.c
@@ -314,6 +314,19 @@ void RTC_init(hourFormat_t format, sourceClock_t source)
 {
   initFormat = format;
 
+  /* Enable Power Clock */
+  __HAL_RCC_PWR_CLK_ENABLE();
+
+#ifdef HAL_PWR_MODULE_ENABLED
+  /* Allow access to Backup domain */
+  HAL_PWR_EnableBkUpAccess();
+#endif
+  /* Reset RTC Domain */
+  if(source != LSE_CLOCK) {
+    __HAL_RCC_BACKUPRESET_FORCE();
+    __HAL_RCC_BACKUPRESET_RELEASE();
+  }
+
   /* Init RTC clock */
   RTC_initClock(source);
 
diff --git a/cores/arduino/stm32/uart.c b/cores/arduino/stm32/uart.c
index af72dd5fa1..dc054c758b 100644
--- a/cores/arduino/stm32/uart.c
+++ b/cores/arduino/stm32/uart.c
@@ -125,6 +125,7 @@ void uart_init(serial_t *obj)
     printf("ERROR: UART pins mismatch\n");
     return;
   }
+
   // Enable USART clock
 #if defined(USART1_BASE)
   else if(obj->uart == USART1) {
@@ -288,6 +289,10 @@ void uart_init(serial_t *obj)
   huart->Init.Mode         = UART_MODE_TX_RX;
   huart->Init.HwFlowCtl    = UART_HWCONTROL_NONE;
   huart->Init.OverSampling = UART_OVERSAMPLING_16;
+#if !defined(STM32F1xx) && !defined(STM32F2xx) && !defined(STM32F4xx)\
+ && !defined(STM32L1xx)
+  huart->AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
+#endif
   // huart->Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
 
   if(HAL_UART_Init(huart) != HAL_OK) {
@@ -403,6 +408,69 @@ void uart_deinit(serial_t *obj)
   HAL_UART_DeInit(uart_handlers[obj->index]);
 }
 
+#if defined(HAL_PWR_MODULE_ENABLED) && defined(UART_IT_WUF)
+/**
+  * @brief  Function called to configure the uart interface for low power
+  * @param  obj : pointer to serial_t structure
+  * @retval None
+  */
+void uart_config_lowpower(serial_t *obj)
+{
+  if(obj == NULL) {
+    return;
+  }
+  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+  /* Ensure HSI clock is enable */
+  if(__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) == RESET) {
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
+    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
+    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK) {
+      Error_Handler();
+    }
+  }
+  /* Configure HSI as source clock for low power wakeup clock */
+  switch (obj->index) {
+#if defined(USART1_BASE)
+    case 0:
+      if (__HAL_RCC_GET_USART1_SOURCE() != RCC_USART1CLKSOURCE_HSI) {
+        __HAL_RCC_USART1_CONFIG(RCC_USART1CLKSOURCE_HSI);
+      }
+      break;
+#endif
+#if defined(USART2_BASE) && defined(__HAL_RCC_USART2_CONFIG)
+    case 1:
+      if (__HAL_RCC_GET_USART2_SOURCE() != RCC_USART2CLKSOURCE_HSI) {
+        __HAL_RCC_USART2_CONFIG(RCC_USART2CLKSOURCE_HSI);
+      }
+      break;
+#endif
+#if defined(USART3_BASE) && defined(__HAL_RCC_USART3_CONFIG)
+    case 2:
+      if (__HAL_RCC_GET_USART3_SOURCE() != RCC_USART3CLKSOURCE_HSI) {
+        __HAL_RCC_USART3_CONFIG(RCC_USART3CLKSOURCE_HSI);
+      }
+      break;
+#endif
+#if defined(UART4_BASE) && defined(__HAL_RCC_UART4_CONFIG)
+    case 3:
+      if (__HAL_RCC_GET_UART4_SOURCE() != RCC_UART4CLKSOURCE_HSI) {
+        __HAL_RCC_UART4_CONFIG(RCC_UART4CLKSOURCE_HSI);
+      }
+      break;
+#endif
+#if defined(UART5_BASE) && defined(__HAL_RCC_UART5_CONFIG)
+    case 4:
+      if (__HAL_RCC_GET_UART5_SOURCE() != RCC_UART5CLKSOURCE_HSI) {
+        __HAL_RCC_UART5_CONFIG(RCC_UART5CLKSOURCE_HSI);
+      }
+      break;
+#endif
+  }
+}
+#endif
+
 /**
   * @brief  write the data on the uart
   * @param  obj : pointer to serial_t structure
@@ -866,6 +934,19 @@ void UART10_IRQHandler(void)
 }
 #endif
 
+/**
+  * @brief  HAL UART Call Back
+  * @param  UART handler
+  * @retval None
+  */
+void HAL_UARTEx_WakeupCallback(UART_HandleTypeDef *huart)
+{
+  uint8_t index = uart_index(huart);
+  serial_t *obj = rx_callback_obj[index];
+
+  HAL_UART_Receive_IT(huart,  &(obj->recv), 1);
+}
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/cores/arduino/stm32/uart.h b/cores/arduino/stm32/uart.h
index 66cd5162a9..97707c80fe 100644
--- a/cores/arduino/stm32/uart.h
+++ b/cores/arduino/stm32/uart.h
@@ -279,6 +279,9 @@ struct serial_s {
 /* Exported functions ------------------------------------------------------- */
 void uart_init(serial_t *obj);
 void uart_deinit(serial_t *obj);
+#if defined(HAL_PWR_MODULE_ENABLED) && defined(UART_IT_WUF)
+void uart_config_lowpower(serial_t *obj);
+#endif
 size_t uart_write(serial_t *obj, uint8_t data, uint16_t size);
 int uart_getc(serial_t *obj, unsigned char* c);
 void uart_attach_rx_callback(serial_t *obj, void (*callback)(serial_t*));
diff --git a/variants/BLUEPILL_F103C8/PinNamesVar.h b/variants/BLUEPILL_F103C8/PinNamesVar.h
new file mode 100644
index 0000000000..b65ff1991e
--- /dev/null
+++ b/variants/BLUEPILL_F103C8/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/BLUEPILL_F103C8/stm32f1xx_hal_conf.h b/variants/BLUEPILL_F103C8/stm32f1xx_hal_conf.h
index 9369936ed5..b466615b2f 100644
--- a/variants/BLUEPILL_F103C8/stm32f1xx_hal_conf.h
+++ b/variants/BLUEPILL_F103C8/stm32f1xx_hal_conf.h
@@ -70,7 +70,7 @@
 /*#define HAL_NOR_MODULE_ENABLED*/
 /*#define HAL_PCCARD_MODULE_ENABLED*/
 /*#define HAL_PCD_MODULE_ENABLED*/
-/*#define HAL_PWR_MODULE_ENABLED*/
+#define HAL_PWR_MODULE_ENABLED
 #define HAL_RCC_MODULE_ENABLED
 #define HAL_RTC_MODULE_ENABLED
 /*#define HAL_SD_MODULE_ENABLED*/
diff --git a/variants/DISCO_F100RB/PinNamesVar.h b/variants/DISCO_F100RB/PinNamesVar.h
new file mode 100644
index 0000000000..b65ff1991e
--- /dev/null
+++ b/variants/DISCO_F100RB/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/DISCO_F100RB/stm32f1xx_hal_conf.h b/variants/DISCO_F100RB/stm32f1xx_hal_conf.h
index 78f5c5cf4d..36a5689a7f 100644
--- a/variants/DISCO_F100RB/stm32f1xx_hal_conf.h
+++ b/variants/DISCO_F100RB/stm32f1xx_hal_conf.h
@@ -70,7 +70,7 @@
 /*#define HAL_NOR_MODULE_ENABLED*/
 /*#define HAL_PCCARD_MODULE_ENABLED*/
 /*#define HAL_PCD_MODULE_ENABLED*/
-/*#define HAL_PWR_MODULE_ENABLED*/
+#define HAL_PWR_MODULE_ENABLED
 #define HAL_RCC_MODULE_ENABLED
 #define HAL_RTC_MODULE_ENABLED
 /*#define HAL_SD_MODULE_ENABLED*/
diff --git a/variants/DISCO_F407VG/PinNamesVar.h b/variants/DISCO_F407VG/PinNamesVar.h
new file mode 100644
index 0000000000..b65ff1991e
--- /dev/null
+++ b/variants/DISCO_F407VG/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/DISCO_F746NG/PinNamesVar.h b/variants/DISCO_F746NG/PinNamesVar.h
new file mode 100644
index 0000000000..8ec2fab4aa
--- /dev/null
+++ b/variants/DISCO_F746NG/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PA_2,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = PC_1,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = PC_13,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = PI_8,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = PI_11,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/DISCO_L072CZ_LRWAN1/PinNamesVar.h b/variants/DISCO_L072CZ_LRWAN1/PinNamesVar.h
new file mode 100644
index 0000000000..0b7fa5cc33
--- /dev/null
+++ b/variants/DISCO_L072CZ_LRWAN1/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PC_13,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/DISCO_L475VG_IOT/PinNamesVar.h b/variants/DISCO_L475VG_IOT/PinNamesVar.h
new file mode 100644
index 0000000000..c4331ecd62
--- /dev/null
+++ b/variants/DISCO_L475VG_IOT/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PC_13,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = PE_6,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = PA_2,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = PC_5,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/MAPLEMINI_F103CB/PinNamesVar.h b/variants/MAPLEMINI_F103CB/PinNamesVar.h
new file mode 100644
index 0000000000..b65ff1991e
--- /dev/null
+++ b/variants/MAPLEMINI_F103CB/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/MAPLEMINI_F103CB/stm32f1xx_hal_conf.h b/variants/MAPLEMINI_F103CB/stm32f1xx_hal_conf.h
index 9369936ed5..b466615b2f 100644
--- a/variants/MAPLEMINI_F103CB/stm32f1xx_hal_conf.h
+++ b/variants/MAPLEMINI_F103CB/stm32f1xx_hal_conf.h
@@ -70,7 +70,7 @@
 /*#define HAL_NOR_MODULE_ENABLED*/
 /*#define HAL_PCCARD_MODULE_ENABLED*/
 /*#define HAL_PCD_MODULE_ENABLED*/
-/*#define HAL_PWR_MODULE_ENABLED*/
+#define HAL_PWR_MODULE_ENABLED
 #define HAL_RCC_MODULE_ENABLED
 #define HAL_RTC_MODULE_ENABLED
 /*#define HAL_SD_MODULE_ENABLED*/
diff --git a/variants/NUCLEO_F030R8/PinNamesVar.h b/variants/NUCLEO_F030R8/PinNamesVar.h
new file mode 100644
index 0000000000..0b7fa5cc33
--- /dev/null
+++ b/variants/NUCLEO_F030R8/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PC_13,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_F030R8/stm32f0xx_hal_conf.h b/variants/NUCLEO_F030R8/stm32f0xx_hal_conf.h
index d455dc3986..31cbb5dc00 100644
--- a/variants/NUCLEO_F030R8/stm32f0xx_hal_conf.h
+++ b/variants/NUCLEO_F030R8/stm32f0xx_hal_conf.h
@@ -66,7 +66,7 @@
 //#define HAL_IRDA_MODULE_ENABLED
 //#define HAL_IWDG_MODULE_ENABLED
 //#define HAL_PCD_MODULE_ENABLED
-//#define HAL_PWR_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
 #define HAL_RCC_MODULE_ENABLED
 #define HAL_RTC_MODULE_ENABLED
 //#define HAL_SMARTCARD_MODULE_ENABLED
diff --git a/variants/NUCLEO_F091RC/PinNamesVar.h b/variants/NUCLEO_F091RC/PinNamesVar.h
new file mode 100644
index 0000000000..ec995a0089
--- /dev/null
+++ b/variants/NUCLEO_F091RC/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PC_13,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = PE_6, /* manually updated */
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = PA_2,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = PC_5,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = PB_5,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = PB_15,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = PF_2, /* manually updated */
+#endif
diff --git a/variants/NUCLEO_F091RC/stm32f0xx_hal_conf.h b/variants/NUCLEO_F091RC/stm32f0xx_hal_conf.h
index c7c47dcb91..45a08eabe7 100644
--- a/variants/NUCLEO_F091RC/stm32f0xx_hal_conf.h
+++ b/variants/NUCLEO_F091RC/stm32f0xx_hal_conf.h
@@ -66,7 +66,7 @@
 //#define HAL_IRDA_MODULE_ENABLED
 //#define HAL_IWDG_MODULE_ENABLED
 //#define HAL_PCD_MODULE_ENABLED
-//#define HAL_PWR_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
 #define HAL_RCC_MODULE_ENABLED
 #define HAL_RTC_MODULE_ENABLED
 //#define HAL_SMARTCARD_MODULE_ENABLED
diff --git a/variants/NUCLEO_F103RB/PinNamesVar.h b/variants/NUCLEO_F103RB/PinNamesVar.h
new file mode 100644
index 0000000000..b65ff1991e
--- /dev/null
+++ b/variants/NUCLEO_F103RB/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_F103RB/stm32f1xx_hal_conf.h b/variants/NUCLEO_F103RB/stm32f1xx_hal_conf.h
index 9369936ed5..b466615b2f 100644
--- a/variants/NUCLEO_F103RB/stm32f1xx_hal_conf.h
+++ b/variants/NUCLEO_F103RB/stm32f1xx_hal_conf.h
@@ -70,7 +70,7 @@
 /*#define HAL_NOR_MODULE_ENABLED*/
 /*#define HAL_PCCARD_MODULE_ENABLED*/
 /*#define HAL_PCD_MODULE_ENABLED*/
-/*#define HAL_PWR_MODULE_ENABLED*/
+#define HAL_PWR_MODULE_ENABLED
 #define HAL_RCC_MODULE_ENABLED
 #define HAL_RTC_MODULE_ENABLED
 /*#define HAL_SD_MODULE_ENABLED*/
diff --git a/variants/NUCLEO_F207ZG/PinNamesVar.h b/variants/NUCLEO_F207ZG/PinNamesVar.h
new file mode 100644
index 0000000000..b65ff1991e
--- /dev/null
+++ b/variants/NUCLEO_F207ZG/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_F302R8/PinNamesVar.h b/variants/NUCLEO_F302R8/PinNamesVar.h
new file mode 100644
index 0000000000..0b7fa5cc33
--- /dev/null
+++ b/variants/NUCLEO_F302R8/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PC_13,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_F302R8/stm32f3xx_hal_conf.h b/variants/NUCLEO_F302R8/stm32f3xx_hal_conf.h
index 9585e0e819..39ab432930 100644
--- a/variants/NUCLEO_F302R8/stm32f3xx_hal_conf.h
+++ b/variants/NUCLEO_F302R8/stm32f3xx_hal_conf.h
@@ -72,7 +72,7 @@
 // #define HAL_IWDG_MODULE_ENABLED
 // #define HAL_OPAMP_MODULE_ENABLED
 // #define HAL_PCD_MODULE_ENABLED
-// #define HAL_PWR_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
 #define HAL_RCC_MODULE_ENABLED
 #define HAL_RTC_MODULE_ENABLED
 // #define HAL_SDADC_MODULE_ENABLED
diff --git a/variants/NUCLEO_F303K8/PinNamesVar.h b/variants/NUCLEO_F303K8/PinNamesVar.h
new file mode 100644
index 0000000000..51e79ef6a5
--- /dev/null
+++ b/variants/NUCLEO_F303K8/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PC_13, /* manually updated */
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_F303RE/PinNamesVar.h b/variants/NUCLEO_F303RE/PinNamesVar.h
new file mode 100644
index 0000000000..45099dfe6c
--- /dev/null
+++ b/variants/NUCLEO_F303RE/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PC_13,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = PE_6, /* manually updated */
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_F303RE/stm32f3xx_hal_conf.h b/variants/NUCLEO_F303RE/stm32f3xx_hal_conf.h
index 3a09bb6299..ecb7c07a8d 100644
--- a/variants/NUCLEO_F303RE/stm32f3xx_hal_conf.h
+++ b/variants/NUCLEO_F303RE/stm32f3xx_hal_conf.h
@@ -72,7 +72,7 @@
 // #define HAL_IWDG_MODULE_ENABLED
 // #define HAL_OPAMP_MODULE_ENABLED
 // #define HAL_PCD_MODULE_ENABLED
-// #define HAL_PWR_MODULE_ENABLED
+#define HAL_PWR_MODULE_ENABLED
 #define HAL_RCC_MODULE_ENABLED
 #define HAL_RTC_MODULE_ENABLED
 // #define HAL_SDADC_MODULE_ENABLED
diff --git a/variants/NUCLEO_F401RE/PinNamesVar.h b/variants/NUCLEO_F401RE/PinNamesVar.h
new file mode 100644
index 0000000000..b65ff1991e
--- /dev/null
+++ b/variants/NUCLEO_F401RE/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_F411RE/PinNamesVar.h b/variants/NUCLEO_F411RE/PinNamesVar.h
new file mode 100644
index 0000000000..b65ff1991e
--- /dev/null
+++ b/variants/NUCLEO_F411RE/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_F429ZI/PinNamesVar.h b/variants/NUCLEO_F429ZI/PinNamesVar.h
new file mode 100644
index 0000000000..b65ff1991e
--- /dev/null
+++ b/variants/NUCLEO_F429ZI/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_F446RE/PinNamesVar.h b/variants/NUCLEO_F446RE/PinNamesVar.h
new file mode 100644
index 0000000000..3acc637167
--- /dev/null
+++ b/variants/NUCLEO_F446RE/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0, /* SYS_WKUP0 */
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PC_13, /* SYS_WKUP1 */
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_L031K6/PinNamesVar.h b/variants/NUCLEO_L031K6/PinNamesVar.h
new file mode 100644
index 0000000000..43ae409097
--- /dev/null
+++ b/variants/NUCLEO_L031K6/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = PA_2,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_L053R8/PinNamesVar.h b/variants/NUCLEO_L053R8/PinNamesVar.h
new file mode 100644
index 0000000000..0b7fa5cc33
--- /dev/null
+++ b/variants/NUCLEO_L053R8/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PC_13,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_L152RE/PinNamesVar.h b/variants/NUCLEO_L152RE/PinNamesVar.h
new file mode 100644
index 0000000000..0b7fa5cc33
--- /dev/null
+++ b/variants/NUCLEO_L152RE/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PC_13,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_L432KC/PinNamesVar.h b/variants/NUCLEO_L432KC/PinNamesVar.h
new file mode 100644
index 0000000000..43ca21646a
--- /dev/null
+++ b/variants/NUCLEO_L432KC/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PC_13, /* manually updated */
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = PA_2,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = PC_5, /* manually updated */
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif
diff --git a/variants/NUCLEO_L476RG/PinNamesVar.h b/variants/NUCLEO_L476RG/PinNamesVar.h
new file mode 100644
index 0000000000..f712d8ac24
--- /dev/null
+++ b/variants/NUCLEO_L476RG/PinNamesVar.h
@@ -0,0 +1,25 @@
+    /* SYS_WKUP */
+#ifdef PWR_WAKEUP_PIN1
+    SYS_WKUP1 = PA_0,
+#endif
+#ifdef PWR_WAKEUP_PIN2
+    SYS_WKUP2 = PC_13,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = PE_6, /* manually updated */
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = PA_2,
+#endif
+#ifdef PWR_WAKEUP_PIN5
+    SYS_WKUP5 = PC_5,
+#endif
+#ifdef PWR_WAKEUP_PIN6
+    SYS_WKUP6 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN7
+    SYS_WKUP7 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN8
+    SYS_WKUP8 = NC,
+#endif