Abstract debugSerial. Re-add unsafe getVal overloads. Better spiBuffer

Author: PaulZC

src/sfe_bus.h

@@ -116,4 +116,27 @@ namespace SparkFun_UBLOX_GNSS
     Stream *_serialPort;
   };
 
+  // The sfeStream device defines behavior for Serial diagnostic prints based around the Stream class.
+  // This is Arduino specific.
+  class SfeStream
+  {
+  public:
+    SfeStream(void) { _serialPort = nullptr; }
+
+    void init(Stream &serialPort) { _serialPort = &serialPort; }
+    void write(uint8_t c) { if (_serialPort != nullptr) _serialPort->write(c); }
+    void print(const char *c) { if (_serialPort != nullptr) _serialPort->print(c); }
+    void print(const __FlashStringHelper*c) { if (_serialPort != nullptr) _serialPort->print(c); }
+    void print(unsigned int c, int f) { if (_serialPort != nullptr) _serialPort->print(c, f); }
+    void print(uint16_t c) { if (_serialPort != nullptr) _serialPort->print(c); }
+    void println() { if (_serialPort != nullptr) _serialPort->println(); }
+    void println(const char *c) { if (_serialPort != nullptr) _serialPort->println(c); }
+    void println(const __FlashStringHelper*c) { if (_serialPort != nullptr) _serialPort->println(c); }
+    void println(size_t c) { if (_serialPort != nullptr) _serialPort->println(c); }
+    void println(uint8_t c, int f) { if (_serialPort != nullptr) _serialPort->println(c, f); }
+
+  private:
+    Stream *_serialPort;
+  };
+
 };