add IS_PIN_SPI(p) to Boards.h

Author: ntruchsess

Boards.h

@@ -143,6 +143,7 @@ writePort(port, value, bitmask):  Write an 8 bit port.
 #define IS_PIN_PWM(p)           digitalPinHasPWM(p)
 #define IS_PIN_SERVO(p)         (IS_PIN_DIGITAL(p) && (p) - 2 < MAX_SERVOS)
 #define IS_PIN_I2C(p)           ((p) == 18 || (p) == 19)
+#define IS_PIN_SPI(p)           ((p) == SS || (p) == MOSI || (p) == MISO || (p) == SCK)
 #define PIN_TO_DIGITAL(p)       (p)
 #define PIN_TO_ANALOG(p)        ((p) - 14)
 #define PIN_TO_PWM(p)           PIN_TO_DIGITAL(p)
@@ -191,6 +192,7 @@ writePort(port, value, bitmask):  Write an 8 bit port.
 #define IS_PIN_PWM(p)           digitalPinHasPWM(p)
 #define IS_PIN_SERVO(p)         ((p) >= 2 && (p) - 2 < MAX_SERVOS)
 #define IS_PIN_I2C(p)           ((p) == 20 || (p) == 21)
+#define IS_PIN_SPI(p)           ((p) == SS || (p) == MOSI || (p) == MISO || (p) == SCK)
 #define PIN_TO_DIGITAL(p)       (p)
 #define PIN_TO_ANALOG(p)        ((p) - 54)
 #define PIN_TO_PWM(p)           PIN_TO_DIGITAL(p)
@@ -255,6 +257,7 @@ writePort(port, value, bitmask):  Write an 8 bit port.
 #define IS_PIN_PWM(p)           ((p) == 3 || (p) == 5 || (p) == 6 || (p) == 9 || (p) == 10 || (p) == 11 || (p) == 13)
 #define IS_PIN_SERVO(p)         ((p) >= 0 && (p) < MAX_SERVOS)
 #define IS_PIN_I2C(p)           ((p) == 2 || (p) == 3)
+#define IS_PIN_SPI(p)           ((p) == SS || (p) == MOSI || (p) == MISO || (p) == SCK)
 #define PIN_TO_DIGITAL(p)       (p)
 #define PIN_TO_ANALOG(p)        (p) - 18
 #define PIN_TO_PWM(p)           PIN_TO_DIGITAL(p)
@@ -298,6 +301,10 @@ writePort(port, value, bitmask):  Write an 8 bit port.
 #error "Please edit Boards.h with a hardware abstraction for this board"
 #endif
 
+// as long this is not defined for all boards:
+#ifndef IS_PIN_SPI(p)
+#define IS_PIN_SPI(p)           0
+#endif
 
 /*==============================================================================
  * readPort() - Read an 8 bit port