Fix https://github.com/arduino/ArduinoCore-samd/issues/83 by changing to 16 bits

cores/arduino/HardwareSerial.h

@@ -68,7 +68,7 @@ class HardwareSerial : public Stream
 {
   public:
     virtual void begin(unsigned long);
-    virtual void begin(unsigned long baudrate, uint8_t config);
+    virtual void begin(unsigned long baudrate, uint16_t config);
     virtual void end();
     virtual int available(void) = 0;
     virtual int peek(void) = 0;

cores/arduino/Uart.cpp

@@ -34,7 +34,7 @@ void Uart::begin(unsigned long baudrate)
   begin(baudrate, (uint8_t)SERIAL_8N1);
 }
 
-void Uart::begin(unsigned long baudrate, uint8_t config)
+void Uart::begin(unsigned long baudrate, uint16_t config)
 {
   pinPeripheral(uc_pinRX, g_APinDescription[uc_pinRX].ulPinType);
   pinPeripheral(uc_pinTX, g_APinDescription[uc_pinTX].ulPinType);
@@ -93,7 +93,7 @@ size_t Uart::write(const uint8_t data)
   return 1;
 }
 
-SercomNumberStopBit Uart::extractNbStopBit(uint8_t config)
+SercomNumberStopBit Uart::extractNbStopBit(uint16_t config)
 {
   switch(config & HARDSER_STOP_BIT_MASK)
   {
@@ -106,7 +106,7 @@ SercomNumberStopBit Uart::extractNbStopBit(uint8_t config)
   }
 }
 
-SercomUartCharSize Uart::extractCharSize(uint8_t config)
+SercomUartCharSize Uart::extractCharSize(uint16_t config)
 {
   switch(config & HARDSER_DATA_MASK)
   {
@@ -126,7 +126,7 @@ SercomUartCharSize Uart::extractCharSize(uint8_t config)
   }
 }
 
-SercomParityMode Uart::extractParity(uint8_t config)
+SercomParityMode Uart::extractParity(uint16_t config)
 {
   switch(config & HARDSER_PARITY_MASK)
   {

cores/arduino/Uart.h

@@ -29,7 +29,7 @@ class Uart : public HardwareSerial
   public:
     Uart(SERCOM *_s, uint8_t _pinRX, uint8_t _pinTX, SercomRXPad _padRX, SercomUartTXPad _padTX);
     void begin(unsigned long baudRate);
-    void begin(unsigned long baudrate, uint8_t config);
+    void begin(unsigned long baudrate, uint16_t config);
     void end();
     int available();
     int peek();
@@ -51,7 +51,7 @@ class Uart : public HardwareSerial
     SercomRXPad uc_padRX;
     SercomUartTXPad uc_padTX;
 
-    SercomNumberStopBit extractNbStopBit(uint8_t config);
-    SercomUartCharSize extractCharSize(uint8_t config);
-    SercomParityMode extractParity(uint8_t config);
+    SercomNumberStopBit extractNbStopBit(uint16_t config);
+    SercomUartCharSize extractCharSize(uint16_t config);
+    SercomParityMode extractParity(uint16_t config);
 };