Added support for generic Stream class

Author: petrkr

src/Adafruit_GPS.cpp

@@ -202,6 +202,17 @@ Adafruit_GPS::Adafruit_GPS(HardwareSerial *ser) {
   gpsHwSerial = ser; // ...override gpsHwSerial with value passed.
 }
 
+/**************************************************************************/
+/*!
+    @brief Constructor when using Stream
+    @param data Pointer to a Stream object
+*/
+/**************************************************************************/
+Adafruit_GPS::Adafruit_GPS(Stream *data) {
+  common_init();     // Set everything to common state, then...
+  gpsStream = data;  // ...override gpsStream with value passed.
+}
+
 /**************************************************************************/
 /*!
     @brief Constructor when using I2C
@@ -246,6 +257,7 @@ void Adafruit_GPS::common_init(void) {
   gpsSwSerial = NULL; // Set both to NULL, then override correct
 #endif
   gpsHwSerial = NULL; // port pointer in corresponding constructor
+  gpsStream = NULL;   // port pointer in corresponding constructor
   gpsI2C = NULL;
   gpsSPI = NULL;
   recvdflag = false;
@@ -298,6 +310,9 @@ size_t Adafruit_GPS::available(void) {
   if (gpsHwSerial) {
     return gpsHwSerial->available();
   }
+  if (gpsStream) {
+    return gpsStream->available();
+  }
   if (gpsI2C || gpsSPI) {
     return 1; // I2C/SPI doesnt have 'availability' so always has a byte at
               // least to read!
@@ -322,6 +337,9 @@ size_t Adafruit_GPS::write(uint8_t c) {
   if (gpsHwSerial) {
     return gpsHwSerial->write(c);
   }
+  if (gpsStream) {
+    return gpsStream->write(c);
+  }
   if (gpsI2C) {
     gpsI2C->beginTransmission(_i2caddr);
     if (gpsI2C->write(c) != 1) {
@@ -379,6 +397,11 @@ char Adafruit_GPS::read(void) {
       return c;
     c = gpsHwSerial->read();
   }
+  if (gpsStream) {
+    if (!gpsStream->available())
+      return c;
+    c = gpsStream->read();
+  }
   if (gpsI2C) {
     if (_buff_idx <= _buff_max) {
       c = _i2cbuffer[_buff_idx];

src/Adafruit_GPS.h

@@ -87,6 +87,7 @@ class Adafruit_GPS : public Print {
   Adafruit_GPS(SoftwareSerial *ser); // Constructor when using SoftwareSerial
 #endif
   Adafruit_GPS(HardwareSerial *ser); // Constructor when using HardwareSerial
+  Adafruit_GPS(Stream *data);        // Constructor when using Stream
   Adafruit_GPS(TwoWire *theWire);    // Constructor when using I2C
   Adafruit_GPS(SPIClass *theSPI, int8_t cspin); // Constructor when using SPI
   Adafruit_GPS(); // Constructor for no communications, just data storage
@@ -286,6 +287,7 @@ class Adafruit_GPS : public Print {
 #endif
   bool noComms = false;
   HardwareSerial *gpsHwSerial;
+  Stream *gpsStream;
   TwoWire *gpsI2C;
   SPIClass *gpsSPI;
   int8_t gpsSPI_cs = -1;