Add pinIsMOSI(), pinIsMISO(), pinIsSCK()

SPI.cpp

 	return true;
 }
 
+bool SPIClass::pinIsMOSI(uint8_t pin)
+{
+	for (unsigned int i = 0; i < sizeof(hardware().mosi_pin); i++) {
+		if (pin == hardware().mosi_pin[i]) return true;
+	}
+	return false;
+}
+
+bool SPIClass::pinIsMISO(uint8_t pin)
+{
+	for (unsigned int i = 0; i < sizeof(hardware().miso_pin); i++) {
+		if (pin == hardware().miso_pin[i]) return true;
+	}
+	return false;
+}
+
+bool SPIClass::pinIsSCK(uint8_t pin)
+{
+	for (unsigned int i = 0; i < sizeof(hardware().sck_pin); i++) {
+		if (pin == hardware().sck_pin[i]) return true;
+	}
+	return false;
+}
+
 // setCS() is not intended for use from normal Arduino programs/sketches.
 uint8_t SPIClass::setCS(uint8_t pin)
 {
 	return 0;
 }
 
+bool SPIClass::pinIsMOSI(uint8_t pin)
+{
+	for (unsigned int i = 0; i < sizeof(hardware().mosi_pin); i++) {
+		if (pin == hardware().mosi_pin[i]) return true;
+	}
+	return false;
+}
+
+bool SPIClass::pinIsMISO(uint8_t pin)
+{
+	for (unsigned int i = 0; i < sizeof(hardware().miso_pin); i++) {
+		if (pin == hardware().miso_pin[i]) return true;
+	}
+	return false;
+}
+
+bool SPIClass::pinIsSCK(uint8_t pin)
+{
+	for (unsigned int i = 0; i < sizeof(hardware().sck_pin); i++) {
+		if (pin == hardware().sck_pin[i]) return true;
+	}
+	return false;
+}
+
 // setCS() is not intended for use from normal Arduino programs/sketches.
 uint8_t SPIClass::setCS(uint8_t pin)
 {

SPI.h

 
 	// return true if "pin" has special chip select capability
 	uint8_t pinIsChipSelect(uint8_t pin);
+	bool pinIsMOSI(uint8_t pin);
+	bool pinIsMISO(uint8_t pin);
+	bool pinIsSCK(uint8_t pin);
 	// return true if both pin1 and pin2 have independent chip select capability
 	bool pinIsChipSelect(uint8_t pin1, uint8_t pin2);
 	// configure a pin for chip select and return its SPI_MCR_PCSIS bitmask
 	void setSCK(uint8_t pin);
 	// return true if "pin" has special chip select capability
 	bool pinIsChipSelect(uint8_t pin);
+	bool pinIsMOSI(uint8_t pin);
+	bool pinIsMISO(uint8_t pin);
+	bool pinIsSCK(uint8_t pin);
 	// return true if both pin1 and pin2 have independent chip select capability
 	bool pinIsChipSelect(uint8_t pin1, uint8_t pin2) { return false; }
 	// configure a pin for chip select and return its SPI_MCR_PCSIS bitmask