From 1a56c168c89a578548afbcbb141265c00953f404 Mon Sep 17 00:00:00 2001
From: "Frederic.Pillon" <frederic.pillon@st.com>
Date: Fri, 11 May 2018 16:30:22 +0200
Subject: [PATCH 01/16] [DISCO_F746NG] Use HSE instead of HSE ByPass

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
---
 variants/DISCO_F746NG/variant.cpp | 30 ++++++++++++++----------------
 1 file changed, 14 insertions(+), 16 deletions(-)

diff --git a/variants/DISCO_F746NG/variant.cpp b/variants/DISCO_F746NG/variant.cpp
index 027661de9f..5f98190d2a 100644
--- a/variants/DISCO_F746NG/variant.cpp
+++ b/variants/DISCO_F746NG/variant.cpp
@@ -63,7 +63,7 @@ extern "C" {
 
 /**
   * @brief  System Clock Configuration
-  *         The system Clock is configured as follow : 
+  *         The system Clock is configured as follow :
   *            System Clock source            = PLL (HSE)
   *            SYSCLK(Hz)                     = 216000000
   *            HCLK(Hz)                       = 216000000
@@ -89,16 +89,14 @@ WEAK void SystemClock_Config(void)
   RCC_ClkInitTypeDef RCC_ClkInitStruct;
   RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
 
-    /**Configure the main internal regulator output voltage 
-    */
+  /* Configure the main internal regulator output voltage */
   __HAL_RCC_PWR_CLK_ENABLE();
 
   __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
 
-    /**Initializes the CPU, AHB and APB busses clocks 
-    */
+  /* Initializes the CPU, AHB and APB busses clocks */
   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
+  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
   RCC_OscInitStruct.PLL.PLLM = 25;
@@ -107,18 +105,16 @@ WEAK void SystemClock_Config(void)
   RCC_OscInitStruct.PLL.PLLQ = 9;
   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
   {
-    while(1) { ; }
+    _Error_Handler(__FILE__, __LINE__);
   }
 
-    /**Activate the Over-Drive mode 
-    */
+  /* Activate the Over-Drive mode */
   if (HAL_PWREx_EnableOverDrive() != HAL_OK)
   {
-    while(1) { ; }
+    _Error_Handler(__FILE__, __LINE__);
   }
 
-    /**Initializes the CPU, AHB and APB busses clocks 
-    */
+  /* Initializes the CPU, AHB and APB busses clocks */
   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                               |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
@@ -128,26 +124,28 @@ WEAK void SystemClock_Config(void)
 
   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7) != HAL_OK)
   {
-    while(1) { ; }
+    _Error_Handler(__FILE__, __LINE__);
   }
 
   PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LTDC|RCC_PERIPHCLK_USART1
                               |RCC_PERIPHCLK_CLK48;
   PeriphClkInitStruct.PLLSAI.PLLSAIN = 192;
-  PeriphClkInitStruct.PLLSAI.PLLSAIR = 2;
+  PeriphClkInitStruct.PLLSAI.PLLSAIR = 5;
   PeriphClkInitStruct.PLLSAI.PLLSAIQ = 2;
   PeriphClkInitStruct.PLLSAI.PLLSAIP = RCC_PLLSAIP_DIV4;
   PeriphClkInitStruct.PLLSAIDivQ = 1;
-  PeriphClkInitStruct.PLLSAIDivR = RCC_PLLSAIDIVR_2;
+  PeriphClkInitStruct.PLLSAIDivR = RCC_PLLSAIDIVR_4;
   PeriphClkInitStruct.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2;
   PeriphClkInitStruct.Clk48ClockSelection = RCC_CLK48SOURCE_PLLSAIP;
   if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
   {
-    while(1) { ; }
+    _Error_Handler(__FILE__, __LINE__);
   }
 
+  /* Configure the Systick interrupt time */
   HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
 
+  /* Configure the Systick */
   HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
 
   /* SysTick_IRQn interrupt configuration */

From 40a553a18f7be5902336067a245c9c34ae0c7f06 Mon Sep 17 00:00:00 2001
From: Frederic Pillon <frederic.pillon@st.com>
Date: Sat, 12 May 2018 17:47:59 +0200
Subject: [PATCH 02/16] [CM7] Enable I-Cache and D-Cache

To disable use of I-Cache, define 'I_CACHE_DISABLED'
To disable use of D-Cache, define 'D_CACHE_DISABLED'

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
---
 cores/arduino/main.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/cores/arduino/main.cpp b/cores/arduino/main.cpp
index 3bf32a6616..741f041d0a 100644
--- a/cores/arduino/main.cpp
+++ b/cores/arduino/main.cpp
@@ -33,6 +33,15 @@ void initVariant() { }
 // Required by FreeRTOS, see http://www.freertos.org/RTOS-Cortex-M3-M4.html
 #ifdef NVIC_PRIORITYGROUP_4
   HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
+#endif
+#if (__CORTEX_M == 0x07U)
+// Defined in CMSIS core_cm7.h
+#ifndef I_CACHE_DISABLED
+  SCB_EnableICache();
+#endif
+#ifndef D_CACHE_DISABLED
+  SCB_EnableDCache();
+#endif
 #endif
 
   init();

From cf54e13565a50c0c61740d7f10e9f8f3ec4ede77 Mon Sep 17 00:00:00 2001
From: "Frederic.Pillon" <frederic.pillon@st.com>
Date: Fri, 11 May 2018 17:24:20 +0200
Subject: [PATCH 03/16] [RTC] Make some arguments optional (part 2)

day and mask pointers arguments of RTC_GetAlarm() could be NULL

Fix unused variable warning

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
---
 cores/arduino/stm32/rtc.c | 50 ++++++++++++++++++++++++++-------------
 1 file changed, 34 insertions(+), 16 deletions(-)

diff --git a/cores/arduino/stm32/rtc.c b/cores/arduino/stm32/rtc.c
index a4350edf1d..562d09110e 100644
--- a/cores/arduino/stm32/rtc.c
+++ b/cores/arduino/stm32/rtc.c
@@ -443,7 +443,12 @@ void RTC_GetTime(uint8_t *hours, uint8_t *minutes, uint8_t *seconds, uint32_t *s
     if(subSeconds != NULL) {
       *subSeconds = RTC_TimeStruct.SubSeconds;
     }
+#else
+    UNUSED(subSeconds);
 #endif
+#else
+    UNUSED(period);
+    UNUSED(subSeconds);
 #endif /* !STM32F1xx */
   }
 }
@@ -581,19 +586,21 @@ void RTC_StopAlarm(void)
 
 /**
   * @brief Get RTC alarm
-  * @param day: 1-31 (day of the month)
-  * @param hours: 0-12 or 0-23 depends on the hours mode.
+  * @param day: 1-31 day of the month (optional could be NULL)
+  * @param hours: 0-12 or 0-23 depends on the hours mode
   * @param minutes: 0-59
   * @param seconds: 0-59
   * @param subSeconds: 0-999 (optional could be NULL)
   * @param period: AM or PM (optional could be NULL)
+  * @param mask: alarm behavior using alarmMask_t combination (optional could be NULL)
+  *              See AN4579 Table 5 for possible values
   * @retval None
   */
 void RTC_GetAlarm(uint8_t *day, uint8_t *hours, uint8_t *minutes, uint8_t *seconds, uint32_t *subSeconds, hourAM_PM_t *period, uint8_t *mask)
 {
   RTC_AlarmTypeDef RTC_AlarmStructure;
 
-  if((day != NULL) && (hours != NULL) && (minutes != NULL) && (seconds != NULL) && (mask != NULL)) {
+  if((hours != NULL) && (minutes != NULL) && (seconds != NULL)) {
     HAL_RTC_GetAlarm(&RtcHandle, &RTC_AlarmStructure, RTC_ALARM_A, RTC_FORMAT_BIN);
 
     *seconds = RTC_AlarmStructure.AlarmTime.Seconds;
@@ -601,7 +608,9 @@ void RTC_GetAlarm(uint8_t *day, uint8_t *hours, uint8_t *minutes, uint8_t *secon
     *hours = RTC_AlarmStructure.AlarmTime.Hours;
 
 #if !defined(STM32F1xx)
-    *day = RTC_AlarmStructure.AlarmDateWeekDay;
+    if (day != NULL) {
+      *day = RTC_AlarmStructure.AlarmDateWeekDay;
+    }
     if(period != NULL) {
       if(RTC_AlarmStructure.AlarmTime.TimeFormat == RTC_HOURFORMAT12_PM) {
         *period = PM;
@@ -613,20 +622,29 @@ void RTC_GetAlarm(uint8_t *day, uint8_t *hours, uint8_t *minutes, uint8_t *secon
     if(subSeconds != NULL) {
       *subSeconds = RTC_AlarmStructure.AlarmTime.SubSeconds;
     }
+#else
+    UNUSED(subSeconds);
 #endif /* !STM32F2xx && !STM32L1xx || STM32L1_ULPH */
-    *mask = OFF_MSK;
-    if(!(RTC_AlarmStructure.AlarmMask & RTC_ALARMMASK_SECONDS)) {
-      *mask |= SS_MSK;
-    }
-    if(!(RTC_AlarmStructure.AlarmMask & RTC_ALARMMASK_MINUTES)) {
-      *mask |= MM_MSK;
-    }
-    if(!(RTC_AlarmStructure.AlarmMask & RTC_ALARMMASK_HOURS)) {
-      *mask |= HH_MSK;
-    }
-    if(!(RTC_AlarmStructure.AlarmMask & RTC_ALARMMASK_DATEWEEKDAY)) {
-      *mask |= D_MSK;
+    if (mask != NULL) {
+      *mask = OFF_MSK;
+      if(!(RTC_AlarmStructure.AlarmMask & RTC_ALARMMASK_SECONDS)) {
+        *mask |= SS_MSK;
+      }
+      if(!(RTC_AlarmStructure.AlarmMask & RTC_ALARMMASK_MINUTES)) {
+        *mask |= MM_MSK;
+      }
+      if(!(RTC_AlarmStructure.AlarmMask & RTC_ALARMMASK_HOURS)) {
+        *mask |= HH_MSK;
+      }
+      if(!(RTC_AlarmStructure.AlarmMask & RTC_ALARMMASK_DATEWEEKDAY)) {
+        *mask |= D_MSK;
+      }
     }
+#else
+    UNUSED(day);
+    UNUSED(period);
+    UNUSED(subSeconds);
+    UNUSED(mask);
 #endif /* !STM32F1xx */
   }
 }

From d0022d7ac36a9fe437a0db81bc66ef1e6a4ea93e Mon Sep 17 00:00:00 2001
From: "Frederic.Pillon" <frederic.pillon@st.com>
Date: Fri, 18 May 2018 13:46:53 +0200
Subject: [PATCH 04/16] [Disco-L475VG] Fix SystemClock_Config

PLLM to 6 is not possible with PLLN set to 40.
Fix USB clock to have 48MHz instead of MSI one

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
---
 variants/DISCO_L475VG_IOT/variant.cpp | 35 ++++++++++++++++++---------
 1 file changed, 24 insertions(+), 11 deletions(-)

diff --git a/variants/DISCO_L475VG_IOT/variant.cpp b/variants/DISCO_L475VG_IOT/variant.cpp
index fdc4cf817b..5cb3111860 100644
--- a/variants/DISCO_L475VG_IOT/variant.cpp
+++ b/variants/DISCO_L475VG_IOT/variant.cpp
@@ -173,17 +173,17 @@ WEAK void SystemClock_Config(void)
   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
   RCC_OscInitStruct.MSIState = RCC_MSI_ON;
   RCC_OscInitStruct.MSICalibrationValue = 0;
-  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11;
+  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
-  RCC_OscInitStruct.PLL.PLLM            = 6;
+  RCC_OscInitStruct.PLL.PLLM            = 1;
   RCC_OscInitStruct.PLL.PLLN            = 40;
   RCC_OscInitStruct.PLL.PLLP            = 7;
-  RCC_OscInitStruct.PLL.PLLQ            = 4;
-  RCC_OscInitStruct.PLL.PLLR            = 4;
+  RCC_OscInitStruct.PLL.PLLQ            = 2;
+  RCC_OscInitStruct.PLL.PLLR            = 2;
   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
   {
-    while(1);
+    Error_Handler();
   }
 
   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
@@ -195,29 +195,42 @@ WEAK void SystemClock_Config(void)
 
   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
   {
-    while(1);
+    Error_Handler();
   }
 
-  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2|RCC_PERIPHCLK_UART4
-                              |RCC_PERIPHCLK_I2C1|RCC_PERIPHCLK_I2C2
+  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1|RCC_PERIPHCLK_USART2
+                              |RCC_PERIPHCLK_USART3|RCC_PERIPHCLK_UART4
+                              |RCC_PERIPHCLK_UART5|RCC_PERIPHCLK_I2C1
+                              |RCC_PERIPHCLK_I2C2|RCC_PERIPHCLK_DFSDM1
                               |RCC_PERIPHCLK_USB|RCC_PERIPHCLK_ADC;
+  PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2;
   PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
+  PeriphClkInit.Usart3ClockSelection = RCC_USART3CLKSOURCE_PCLK1;
   PeriphClkInit.Uart4ClockSelection = RCC_UART4CLKSOURCE_PCLK1;
+  PeriphClkInit.Uart5ClockSelection = RCC_UART5CLKSOURCE_PCLK1;
   PeriphClkInit.I2c1ClockSelection = RCC_I2C1CLKSOURCE_PCLK1;
   PeriphClkInit.I2c2ClockSelection = RCC_I2C2CLKSOURCE_PCLK1;
   PeriphClkInit.AdcClockSelection = RCC_ADCCLKSOURCE_SYSCLK;
-  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_MSI;
+  PeriphClkInit.Dfsdm1ClockSelection = RCC_DFSDM1CLKSOURCE_PCLK;
+  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLLSAI1;
+  PeriphClkInit.PLLSAI1.PLLSAI1Source = RCC_PLLSOURCE_MSI;
+  PeriphClkInit.PLLSAI1.PLLSAI1M = 1;
+  PeriphClkInit.PLLSAI1.PLLSAI1N = 24;
+  PeriphClkInit.PLLSAI1.PLLSAI1P = RCC_PLLP_DIV7;
+  PeriphClkInit.PLLSAI1.PLLSAI1Q = RCC_PLLQ_DIV2;
+  PeriphClkInit.PLLSAI1.PLLSAI1R = RCC_PLLR_DIV2;
+  PeriphClkInit.PLLSAI1.PLLSAI1ClockOut = RCC_PLLSAI1_48M2CLK;
 
   if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
   {
-    while(1);
+    Error_Handler();
   }
 
     /**Configure the main internal regulator output voltage
     */
   if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
   {
-    while(1);
+    Error_Handler();
   }
 
   /**Configure the Systick interrupt time

From 041c616e6943508cb016fa72a2c386651f7aa07d Mon Sep 17 00:00:00 2001
From: Frederic Pillon <frederic.pillon@st.com>
Date: Sat, 19 May 2018 20:02:02 +0200
Subject: [PATCH 05/16] Update wiring_private.h to include stdarg.h

va_start & va_end was not defined
To have them defined include wiring_private.h

Fix #240

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>
---
 cores/arduino/wiring_private.h | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/cores/arduino/wiring_private.h b/cores/arduino/wiring_private.h
index a9608cef04..cf411613c6 100644
--- a/cores/arduino/wiring_private.h
+++ b/cores/arduino/wiring_private.h
@@ -1,5 +1,8 @@
 /*
-  Copyright (c) 2011 Arduino.  All right reserved.
+  wiring_private.h - Internal header file.
+  Part of Arduino - http://www.arduino.cc/
+
+  Copyright (c) 2005-2006 David A. Mellis
 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
@@ -8,15 +11,19 @@
 
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
-  See the GNU Lesser General Public License for more details.
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
 
-  You should have received a copy of the GNU Lesser General Public
-  License along with this library; if not, write to the Free Software
-  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+  You should have received a copy of the GNU Lesser General
+  Public License along with this library; if not, write to the
+  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+  Boston, MA  02111-1307  USA
 */
 
 #ifndef WiringPrivate_h
 #define WiringPrivate_h
 
+#include <stdio.h>
+#include <stdarg.h>
+
 #endif

From 116da57a6f050128ccaa2a0f7a04010475e0d9af Mon Sep 17 00:00:00 2001
From: fpr <fabien.perroquin@wi6labs.com>
Date: Mon, 18 Dec 2017 11:57:50 +0100
Subject: [PATCH 06/16] Update HardwareSerial and uart driver for low power
 mode

Signed-off-by: fpr <fabien.perroquin@wi6labs.com>
---
 cores/arduino/HardwareSerial.cpp | 11 +++++
 cores/arduino/HardwareSerial.h   |  4 ++
 cores/arduino/stm32/uart.c       | 78 ++++++++++++++++++++++++++++++++
 cores/arduino/stm32/uart.h       |  3 ++
 4 files changed, 96 insertions(+)

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/stm32/uart.c b/cores/arduino/stm32/uart.c
index af72dd5fa1..f77b343694 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 +289,7 @@ 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;
+  huart->AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
   // huart->Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
 
   if(HAL_UART_Init(huart) != HAL_OK) {
@@ -403,6 +405,69 @@ 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 +931,19 @@ 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*));

From 60d89187025e869c6159ec1c9ec03a0cb504bf5c Mon Sep 17 00:00:00 2001
From: "Frederic.Pillon" <frederic.pillon@st.com>
Date: Wed, 23 May 2018 09:24:08 +0200
Subject: [PATCH 07/16] Add SYS_WAKUP pins list

List is generated in "PinNamesVar.h" thanks genpinmap script
and included in the PinName enumeration

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
---
 cores/arduino/stm32/PinNames.h             | 10 +++++++--
 variants/BLUEPILL_F103C8/PinNamesVar.h     | 25 ++++++++++++++++++++++
 variants/DISCO_F100RB/PinNamesVar.h        | 25 ++++++++++++++++++++++
 variants/DISCO_F407VG/PinNamesVar.h        | 25 ++++++++++++++++++++++
 variants/DISCO_F746NG/PinNamesVar.h        | 25 ++++++++++++++++++++++
 variants/DISCO_L072CZ_LRWAN1/PinNamesVar.h | 25 ++++++++++++++++++++++
 variants/DISCO_L475VG_IOT/PinNamesVar.h    | 25 ++++++++++++++++++++++
 variants/MAPLEMINI_F103CB/PinNamesVar.h    | 25 ++++++++++++++++++++++
 variants/NUCLEO_F030R8/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_F091RC/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_F103RB/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_F207ZG/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_F302R8/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_F303K8/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_F303RE/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_F401RE/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_F411RE/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_F429ZI/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_F446RE/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_L031K6/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_L053R8/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_L152RE/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_L432KC/PinNamesVar.h       | 25 ++++++++++++++++++++++
 variants/NUCLEO_L476RG/PinNamesVar.h       | 25 ++++++++++++++++++++++
 24 files changed, 583 insertions(+), 2 deletions(-)
 create mode 100644 variants/BLUEPILL_F103C8/PinNamesVar.h
 create mode 100644 variants/DISCO_F100RB/PinNamesVar.h
 create mode 100644 variants/DISCO_F407VG/PinNamesVar.h
 create mode 100644 variants/DISCO_F746NG/PinNamesVar.h
 create mode 100644 variants/DISCO_L072CZ_LRWAN1/PinNamesVar.h
 create mode 100644 variants/DISCO_L475VG_IOT/PinNamesVar.h
 create mode 100644 variants/MAPLEMINI_F103CB/PinNamesVar.h
 create mode 100644 variants/NUCLEO_F030R8/PinNamesVar.h
 create mode 100644 variants/NUCLEO_F091RC/PinNamesVar.h
 create mode 100644 variants/NUCLEO_F103RB/PinNamesVar.h
 create mode 100644 variants/NUCLEO_F207ZG/PinNamesVar.h
 create mode 100644 variants/NUCLEO_F302R8/PinNamesVar.h
 create mode 100644 variants/NUCLEO_F303K8/PinNamesVar.h
 create mode 100644 variants/NUCLEO_F303RE/PinNamesVar.h
 create mode 100644 variants/NUCLEO_F401RE/PinNamesVar.h
 create mode 100644 variants/NUCLEO_F411RE/PinNamesVar.h
 create mode 100644 variants/NUCLEO_F429ZI/PinNamesVar.h
 create mode 100644 variants/NUCLEO_F446RE/PinNamesVar.h
 create mode 100644 variants/NUCLEO_L031K6/PinNamesVar.h
 create mode 100644 variants/NUCLEO_L053R8/PinNamesVar.h
 create mode 100644 variants/NUCLEO_L152RE/PinNamesVar.h
 create mode 100644 variants/NUCLEO_L432KC/PinNamesVar.h
 create mode 100644 variants/NUCLEO_L476RG/PinNamesVar.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/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/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_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/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_F091RC/PinNamesVar.h b/variants/NUCLEO_F091RC/PinNamesVar.h
new file mode 100644
index 0000000000..b518e66b26
--- /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 = NC,
+#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 = NC,
+#endif
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_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_F303K8/PinNamesVar.h b/variants/NUCLEO_F303K8/PinNamesVar.h
new file mode 100644
index 0000000000..b65ff1991e
--- /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 = 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_F303RE/PinNamesVar.h b/variants/NUCLEO_F303RE/PinNamesVar.h
new file mode 100644
index 0000000000..0b7fa5cc33
--- /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 = 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_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..9cfcfcfe5f
--- /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 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN3
+    SYS_WKUP3 = NC,
+#endif
+#ifdef PWR_WAKEUP_PIN4
+    SYS_WKUP4 = PA_2,
+#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_L476RG/PinNamesVar.h b/variants/NUCLEO_L476RG/PinNamesVar.h
new file mode 100644
index 0000000000..3c49dd2997
--- /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 = NC,
+#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

From 47f9d9242ca4cd84b81d73a514333f65c489a5e4 Mon Sep 17 00:00:00 2001
From: "Frederic.Pillon" <frederic.pillon@st.com>
Date: Wed, 2 May 2018 16:49:16 +0200
Subject: [PATCH 08/16] Update manually some SYS_WKUPx

Some SYS_WKUP are not in the MCU xml file so it is sometime
required to update them manually in PinNamesVar.h
Refers to MCU datasheet.

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
---
 variants/NUCLEO_F091RC/PinNamesVar.h | 4 ++--
 variants/NUCLEO_F303K8/PinNamesVar.h | 2 +-
 variants/NUCLEO_F303RE/PinNamesVar.h | 2 +-
 variants/NUCLEO_L432KC/PinNamesVar.h | 4 ++--
 variants/NUCLEO_L476RG/PinNamesVar.h | 2 +-
 5 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/variants/NUCLEO_F091RC/PinNamesVar.h b/variants/NUCLEO_F091RC/PinNamesVar.h
index b518e66b26..ec995a0089 100644
--- a/variants/NUCLEO_F091RC/PinNamesVar.h
+++ b/variants/NUCLEO_F091RC/PinNamesVar.h
@@ -6,7 +6,7 @@
     SYS_WKUP2 = PC_13,
 #endif
 #ifdef PWR_WAKEUP_PIN3
-    SYS_WKUP3 = NC,
+    SYS_WKUP3 = PE_6, /* manually updated */
 #endif
 #ifdef PWR_WAKEUP_PIN4
     SYS_WKUP4 = PA_2,
@@ -21,5 +21,5 @@
     SYS_WKUP7 = PB_15,
 #endif
 #ifdef PWR_WAKEUP_PIN8
-    SYS_WKUP8 = NC,
+    SYS_WKUP8 = PF_2, /* manually updated */
 #endif
diff --git a/variants/NUCLEO_F303K8/PinNamesVar.h b/variants/NUCLEO_F303K8/PinNamesVar.h
index b65ff1991e..51e79ef6a5 100644
--- a/variants/NUCLEO_F303K8/PinNamesVar.h
+++ b/variants/NUCLEO_F303K8/PinNamesVar.h
@@ -3,7 +3,7 @@
     SYS_WKUP1 = PA_0,
 #endif
 #ifdef PWR_WAKEUP_PIN2
-    SYS_WKUP2 = NC,
+    SYS_WKUP2 = PC_13, /* manually updated */
 #endif
 #ifdef PWR_WAKEUP_PIN3
     SYS_WKUP3 = NC,
diff --git a/variants/NUCLEO_F303RE/PinNamesVar.h b/variants/NUCLEO_F303RE/PinNamesVar.h
index 0b7fa5cc33..45099dfe6c 100644
--- a/variants/NUCLEO_F303RE/PinNamesVar.h
+++ b/variants/NUCLEO_F303RE/PinNamesVar.h
@@ -6,7 +6,7 @@
     SYS_WKUP2 = PC_13,
 #endif
 #ifdef PWR_WAKEUP_PIN3
-    SYS_WKUP3 = NC,
+    SYS_WKUP3 = PE_6, /* manually updated */
 #endif
 #ifdef PWR_WAKEUP_PIN4
     SYS_WKUP4 = NC,
diff --git a/variants/NUCLEO_L432KC/PinNamesVar.h b/variants/NUCLEO_L432KC/PinNamesVar.h
index 9cfcfcfe5f..43ca21646a 100644
--- a/variants/NUCLEO_L432KC/PinNamesVar.h
+++ b/variants/NUCLEO_L432KC/PinNamesVar.h
@@ -3,7 +3,7 @@
     SYS_WKUP1 = PA_0,
 #endif
 #ifdef PWR_WAKEUP_PIN2
-    SYS_WKUP2 = NC,
+    SYS_WKUP2 = PC_13, /* manually updated */
 #endif
 #ifdef PWR_WAKEUP_PIN3
     SYS_WKUP3 = NC,
@@ -12,7 +12,7 @@
     SYS_WKUP4 = PA_2,
 #endif
 #ifdef PWR_WAKEUP_PIN5
-    SYS_WKUP5 = NC,
+    SYS_WKUP5 = PC_5, /* manually updated */
 #endif
 #ifdef PWR_WAKEUP_PIN6
     SYS_WKUP6 = NC,
diff --git a/variants/NUCLEO_L476RG/PinNamesVar.h b/variants/NUCLEO_L476RG/PinNamesVar.h
index 3c49dd2997..f712d8ac24 100644
--- a/variants/NUCLEO_L476RG/PinNamesVar.h
+++ b/variants/NUCLEO_L476RG/PinNamesVar.h
@@ -6,7 +6,7 @@
     SYS_WKUP2 = PC_13,
 #endif
 #ifdef PWR_WAKEUP_PIN3
-    SYS_WKUP3 = NC,
+    SYS_WKUP3 = PE_6, /* manually updated */
 #endif
 #ifdef PWR_WAKEUP_PIN4
     SYS_WKUP4 = PA_2,

From 861861041908fcb0382745a2e0dc2e989d894adf Mon Sep 17 00:00:00 2001
From: "Frederic.Pillon" <frederic.pillon@st.com>
Date: Thu, 26 Apr 2018 08:33:57 +0200
Subject: [PATCH 09/16] Add low power driver

Signed-off-by: fpr <fabien.perroquin@wi6labs.com>
---
 cores/arduino/board.h           |   1 +
 cores/arduino/stm32/low_power.c | 332 ++++++++++++++++++++++++++++++++
 cores/arduino/stm32/low_power.h |  71 +++++++
 cores/arduino/stm32/uart.c      |   3 +
 4 files changed, 407 insertions(+)
 create mode 100644 cores/arduino/stm32/low_power.c
 create mode 100644 cores/arduino/stm32/low_power.h

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/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/uart.c b/cores/arduino/stm32/uart.c
index f77b343694..dc054c758b 100644
--- a/cores/arduino/stm32/uart.c
+++ b/cores/arduino/stm32/uart.c
@@ -289,7 +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) {

From f1243f59af1f230ec70e19942ad687e7210de053 Mon Sep 17 00:00:00 2001
From: "Frederic.Pillon" <frederic.pillon@st.com>
Date: Fri, 27 Apr 2018 16:18:04 +0200
Subject: [PATCH 10/16] Enable PWR HAL for all variants

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
---
 variants/BLUEPILL_F103C8/stm32f1xx_hal_conf.h  | 2 +-
 variants/DISCO_F100RB/stm32f1xx_hal_conf.h     | 2 +-
 variants/MAPLEMINI_F103CB/stm32f1xx_hal_conf.h | 2 +-
 variants/NUCLEO_F030R8/stm32f0xx_hal_conf.h    | 2 +-
 variants/NUCLEO_F091RC/stm32f0xx_hal_conf.h    | 2 +-
 variants/NUCLEO_F103RB/stm32f1xx_hal_conf.h    | 2 +-
 variants/NUCLEO_F302R8/stm32f3xx_hal_conf.h    | 2 +-
 variants/NUCLEO_F303RE/stm32f3xx_hal_conf.h    | 2 +-
 8 files changed, 8 insertions(+), 8 deletions(-)

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/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/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/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/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/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_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_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

From dd3a59c8d57ddbbbf4e38a72a64746c5a61efe0e Mon Sep 17 00:00:00 2001
From: "Frederic.Pillon" <frederic.pillon@st.com>
Date: Thu, 24 May 2018 18:10:49 +0200
Subject: [PATCH 11/16] [RTC] Allow access to Backup domain

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
---
 cores/arduino/stm32/rtc.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

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);
 

From 9bb2a170a4403f27a8e01f84623754081ebb7121 Mon Sep 17 00:00:00 2001
From: Frederic Pillon <frederic.pillon@st.com>
Date: Mon, 28 May 2018 22:35:50 +0200
Subject: [PATCH 12/16] Fix issue when build path contains space

Issue and fix reported by @jmchiappa
Fix #256

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>
---
 platform.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/platform.txt b/platform.txt
index 8aec01d6d4..3b4f455509 100644
--- a/platform.txt
+++ b/platform.txt
@@ -29,7 +29,7 @@ compiler.c.elf.cmd=arm-none-eabi-gcc
 compiler.objcopy.cmd=arm-none-eabi-objcopy
 compiler.elf2hex.cmd=arm-none-eabi-objcopy
 
-compiler.extra_flags=-mcpu={build.mcu} -mthumb @{build.opt.path}
+compiler.extra_flags=-mcpu={build.mcu} -mthumb "@{build.opt.path}"
 
 compiler.S.flags={compiler.extra_flags} -c -x assembler-with-cpp {compiler.stm.extra_include}
 

From 9ccd60289e52cf21470c93befeebf1454619234a Mon Sep 17 00:00:00 2001
From: "Frederic.Pillon" <frederic.pillon@st.com>
Date: Tue, 29 May 2018 11:44:08 +0200
Subject: [PATCH 13/16] Fix Reset RTC Domain

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
---
 cores/arduino/stm32/low_power.c | 4 ----
 cores/arduino/stm32/rtc.c       | 6 ++----
 2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/cores/arduino/stm32/low_power.c b/cores/arduino/stm32/low_power.c
index 1b47663068..7f09544ab9 100644
--- a/cores/arduino/stm32/low_power.c
+++ b/cores/arduino/stm32/low_power.c
@@ -64,10 +64,6 @@ void LowPower_init(){
   /* 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);
diff --git a/cores/arduino/stm32/rtc.c b/cores/arduino/stm32/rtc.c
index 7e7d2fabcc..09ab2cc498 100644
--- a/cores/arduino/stm32/rtc.c
+++ b/cores/arduino/stm32/rtc.c
@@ -322,10 +322,8 @@ void RTC_init(hourFormat_t format, sourceClock_t source)
   HAL_PWR_EnableBkUpAccess();
 #endif
   /* Reset RTC Domain */
-  if(source != LSE_CLOCK) {
-    __HAL_RCC_BACKUPRESET_FORCE();
-    __HAL_RCC_BACKUPRESET_RELEASE();
-  }
+  __HAL_RCC_BACKUPRESET_FORCE();
+  __HAL_RCC_BACKUPRESET_RELEASE();
 
   /* Init RTC clock */
   RTC_initClock(source);

From 5ae76ace2daea836ce25269ad9374a15fcd9622d Mon Sep 17 00:00:00 2001
From: EvArk <arkalis.e@gmail.com>
Date: Fri, 27 Apr 2018 15:07:16 +0300
Subject: [PATCH 14/16] Add Blackmagic (BMP) support for Generic F103

Based and closes #238

Signed-off-by: EvArk <arkalis.e@gmail.com>
---
 boards.txt   | 4 ++++
 platform.txt | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/boards.txt b/boards.txt
index 8617e7d8f9..5ba845f919 100644
--- a/boards.txt
+++ b/boards.txt
@@ -418,6 +418,10 @@ GenF103.menu.upload_method.serialMethod=Serial
 GenF103.menu.upload_method.serialMethod.upload.protocol=maple_serial
 GenF103.menu.upload_method.serialMethod.upload.tool=serial_upload
 
+GenF103.menu.upload_method.bmpMethod=BMP (Black Magic Probe)
+GenF103.menu.upload_method.bmpMethod.upload.protocol=gdb_bmp
+GenF103.menu.upload_method.bmpMethod.upload.tool=bmp_upload
+
 ###############################
 # Maple
 Maple.name=Maple series
diff --git a/platform.txt b/platform.txt
index 3b4f455509..5425382cae 100644
--- a/platform.txt
+++ b/platform.txt
@@ -172,3 +172,11 @@ tools.serial_upload.path.linux64={runtime.hardware.path}/tools/linux64
 tools.serial_upload.upload.params.verbose=-d
 tools.serial_upload.upload.params.quiet=n
 tools.serial_upload.upload.pattern="{path}/{cmd}" {serial.port.file} {upload.altID} {upload.usbID} "{build.path}/{build.project_name}.bin"
+
+# blackmagic upload for generic STM32
+tools.bmp_upload.cmd=arm-none-eabi-gdb
+tools.bmp_upload.path={runtime.tools.arm-none-eabi-gcc.path}/bin/
+tools.bmp_upload.upload.speed=230400
+tools.bmp_upload.upload.params.verbose=-batch
+tools.bmp_upload.upload.params.quiet=--batch-silent
+tools.bmp_upload.upload.pattern="{path}{cmd}" -nx -b {upload.speed} {upload.verbose} -ex "set confirm off" -ex "target extended-remote {serial.port}" -ex "monitor swdp_scan" -ex "attach 1" -ex "load" -ex "compare-sections" -ex "kill" "{build.path}/{build.project_name}.elf"

From 96fb0d81f46dacbc264d01b901eea9946fd0a684 Mon Sep 17 00:00:00 2001
From: Frederic Pillon <frederic.pillon@st.com>
Date: Tue, 29 May 2018 22:19:14 +0200
Subject: [PATCH 15/16] Fix wrong SPI switch

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>
---
 cores/arduino/stm32/spi_com.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cores/arduino/stm32/spi_com.c b/cores/arduino/stm32/spi_com.c
index a7d55da439..eaca8c5a47 100644
--- a/cores/arduino/stm32/spi_com.c
+++ b/cores/arduino/stm32/spi_com.c
@@ -118,7 +118,7 @@ uint32_t spi_getClkFreqInst(SPI_TypeDef * spi_inst)
   if(spi_inst != NP) {
     /* Get source clock depending on SPI instance */
     switch ((uint32_t)spi_inst) {
-#if defined(SPI1_BASE) || defined(SPI4_BASE) || defined(SPI5_BASE) || defined(SPI16_BASE)
+#if defined(SPI1_BASE) || defined(SPI4_BASE) || defined(SPI5_BASE) || defined(SPI6_BASE)
       /* Some STM32's (eg. STM32F302x8) have no SPI1, but do have SPI2/3. */
 #if defined SPI1_BASE
       case (uint32_t)SPI1:

From 22290391347075c19152716efe0c95bda5e9c6ac Mon Sep 17 00:00:00 2001
From: "Frederic.Pillon" <frederic.pillon@st.com>
Date: Wed, 30 May 2018 10:56:41 +0200
Subject: [PATCH 16/16] [RTC] Fix issue with non STM32L1 ULPH

HAL_RTCEx_EnableBypassShadow is only available for STM32L1 ULPH

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>
---
 cores/arduino/stm32/rtc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cores/arduino/stm32/rtc.c b/cores/arduino/stm32/rtc.c
index 09ab2cc498..1f9398d4ad 100644
--- a/cores/arduino/stm32/rtc.c
+++ b/cores/arduino/stm32/rtc.c
@@ -358,7 +358,7 @@ void RTC_init(hourFormat_t format, sourceClock_t source)
   /*at 0:0:0*/
   RTC_SetTime(0,0,0,0,AM);
 
-#if !defined(STM32F1xx) && !defined(STM32F2xx)
+#if !defined(STM32F1xx) && !defined(STM32F2xx) && !defined(STM32L1xx) || defined(STM32L1_ULPH)
   /* Enable Direct Read of the calendar registers (not through Shadow) */
   HAL_RTCEx_EnableBypassShadow(&RtcHandle);
 #endif /* !STM32F1xx && !STM32F2xx */