Support for repeated starts added to SAM Wire library

Additional interface method ported to avr for compatibility
Fix issue arduino#2428.

Author: mattwlowe

libraries/Wire/Wire.cpp

@@ -131,13 +131,13 @@ void TwoWire::setClock(uint32_t frequency) {
 	TWI_SetClock(twi, twiClock, VARIANT_MCK);
 }
 
-uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop) {
+uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint32_t iaddress, uint8_t isize, uint8_t sendStop) {
 	if (quantity > BUFFER_LENGTH)
 		quantity = BUFFER_LENGTH;
 
 	// perform blocking read into buffer
 	int readed = 0;
-	TWI_StartRead(twi, address, 0, 0);
+	TWI_StartRead(twi, address, iaddress, isize);
 	do {
 		// Stop condition must be set during the reception of last byte
 		if (readed + 1 == quantity)
@@ -157,6 +157,10 @@ uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop
 	return readed;
 }
 
+uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop) {
+	return requestFrom((uint8_t) address, (uint8_t) quantity, (uint32_t) 0, (uint8_t) 0, (uint8_t) sendStop);
+}
+
 uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity) {
 	return requestFrom((uint8_t) address, (uint8_t) quantity, (uint8_t) true);
 }

libraries/Wire/Wire.h

@@ -42,6 +42,7 @@ class TwoWire : public Stream {
     uint8_t endTransmission(uint8_t);
 	uint8_t requestFrom(uint8_t, uint8_t);
     uint8_t requestFrom(uint8_t, uint8_t, uint8_t);
+	uint8_t requestFrom(uint8_t, uint8_t, uint32_t, uint8_t, uint8_t);
 	uint8_t requestFrom(int, int);
     uint8_t requestFrom(int, int, int);
 	virtual size_t write(uint8_t);