Merge pull request stm32duino#255 from fpistm/pr183-review

Add Low Power driver (Rework of PR 183)

Author: fpistm

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) {

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;

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"

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