[SPI] Fix spurious HW SS assignment

Fixes arduino-libraries/WiFiNINA#60

Author: facchinm

libraries/SPI/src/SPI.cpp

@@ -44,12 +44,11 @@ void SPIClass::begin()
 
   PORTMUX.TWISPIROUTEA |= _uc_mux;
 
-  // We don't need HW SS since salve/master mode is selected via registers, so make it simply INPUT
-  pinMode(_uc_pinSS, INPUT);
   pinMode(_uc_pinMosi, OUTPUT);
   pinMode(_uc_pinSCK, OUTPUT);
   // MISO is set to input by the controller
 
+  // We don't need HW SS since salve/master mode is selected via registers
   SPI0.CTRLB |= (SPI_SSD_bm);
   SPI0.CTRLA |= (SPI_ENABLE_bm | SPI_MASTER_bm);
 

variants/nona4809/pins_arduino.h

@@ -44,7 +44,7 @@
 #define PIN_SPI_MISO  (12)
 #define PIN_SPI_SCK   (13)
 #define PIN_SPI_MOSI  (11)
-#define PIN_SPI_SS    (10)
+#define PIN_SPI_SS    (8)
 
 static const uint8_t SS   = PIN_SPI_SS;
 static const uint8_t MOSI = PIN_SPI_MOSI;

variants/uno2018/pins_arduino.h

@@ -45,7 +45,7 @@
 #define PIN_SPI_MISO  (33)
 #define PIN_SPI_SCK   (34)
 #define PIN_SPI_MOSI  (32)
-#define PIN_SPI_SS    (10)
+#define PIN_SPI_SS    (22)
 
 static const uint8_t SS   = PIN_SPI_SS;
 static const uint8_t MOSI = PIN_SPI_MOSI;