Merge pull request #44 from KurtE/specify_which_spi

Allow code to specify which SPI buss to use

Author: ladyada

Adafruit_MAX31855.cpp

@@ -59,9 +59,11 @@ Adafruit_MAX31855::Adafruit_MAX31855(int8_t _sclk, int8_t _cs, int8_t _miso)
     @brief  Instantiates a new Adafruit_MAX31855 class using hardware SPI.
 
     @param _cs The pin to use for SPI Chip Select.
+    @param _spi which spi buss to use.
 */
 /**************************************************************************/
-Adafruit_MAX31855::Adafruit_MAX31855(int8_t _cs) : spi_dev(_cs, 1000000) {}
+Adafruit_MAX31855::Adafruit_MAX31855(int8_t _cs, SPIClass *_spi)
+    : spi_dev(_cs, 1000000, SPI_BITORDER_MSBFIRST, SPI_MODE0, _spi) {}
 
 /**************************************************************************/
 /*!

Adafruit_MAX31855.h

@@ -37,7 +37,7 @@
 class Adafruit_MAX31855 {
 public:
   Adafruit_MAX31855(int8_t _sclk, int8_t _cs, int8_t _miso);
-  Adafruit_MAX31855(int8_t _cs);
+  Adafruit_MAX31855(int8_t _cs, SPIClass *_spi = &SPI);
 
   bool begin(void);
   double readInternal(void);

examples/serialthermocouple/serialthermocouple.ino

@@ -34,6 +34,11 @@ Adafruit_MAX31855 thermocouple(MAXCLK, MAXCS, MAXDO);
 //#define MAXCS   10
 //Adafruit_MAX31855 thermocouple(MAXCS);
 
+// Example creating a thermocouple instance with hardware SPI
+// on SPI1 using specified CS pin.
+//#define MAXCS   10
+//Adafruit_MAX31855 thermocouple(MAXCS, SPI1);
+
 void setup() {
   Serial.begin(9600);