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digistump-sam/libraries/Wire/Wire.cpp

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+/*
+ * TwoWire.h - TWI/I2C library for Arduino Due
+ * Copyright (c) 2011 Cristian Maglie <c.maglie@bug.st>.
+ * All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+extern "C" {
+#include <string.h>
+}
+
+#include "Wire.h"
+
+static inline bool TWI_FailedAcknowledge(Twi *pTwi) {
+	return pTwi->TWI_SR & TWI_SR_NACK;
+}
+
+static inline bool TWI_WaitTransferComplete(Twi *_twi, uint32_t _timeout) {
+	while (!TWI_TransferComplete(_twi)) {
+		if (TWI_FailedAcknowledge(_twi))
+			return false;
+		if (--_timeout == 0)
+			return false;
+	}
+	return true;
+}
+
+static inline bool TWI_WaitByteSent(Twi *_twi, uint32_t _timeout) {
+	while (!TWI_ByteSent(_twi)) {
+		if (TWI_FailedAcknowledge(_twi))
+			return false;
+		if (--_timeout == 0)
+			return false;
+	}
+	return true;
+}
+
+static inline bool TWI_WaitByteReceived(Twi *_twi, uint32_t _timeout) {
+	while (!TWI_ByteReceived(_twi)) {
+		if (TWI_FailedAcknowledge(_twi))
+			return false;
+		if (--_timeout == 0)
+			return false;
+	}
+	return true;
+}
+
+static inline bool TWI_STATUS_SVREAD(uint32_t status) {
+	return (status & TWI_SR_SVREAD) == TWI_SR_SVREAD;
+}
+
+static inline bool TWI_STATUS_SVACC(uint32_t status) {
+	return (status & TWI_SR_SVACC) == TWI_SR_SVACC;
+}
+
+static inline bool TWI_STATUS_GACC(uint32_t status) {
+	return (status & TWI_SR_GACC) == TWI_SR_GACC;
+}
+
+static inline bool TWI_STATUS_EOSACC(uint32_t status) {
+	return (status & TWI_SR_EOSACC) == TWI_SR_EOSACC;
+}
+
+static inline bool TWI_STATUS_NACK(uint32_t status) {
+	return (status & TWI_SR_NACK) == TWI_SR_NACK;
+}
+
+TwoWire::TwoWire(Twi *_twi, void(*_beginCb)(void)) :
+	twi(_twi), rxBufferIndex(0), rxBufferLength(0), txAddress(0),
+			txBufferLength(0), srvBufferIndex(0), srvBufferLength(0), status(
+					UNINITIALIZED), onBeginCallback(_beginCb) {
+	// Empty
+}
+
+void TwoWire::begin(void) {
+	if (onBeginCallback)
+		onBeginCallback();
+
+	// Disable PDC channel
+	twi->TWI_PTCR = UART_PTCR_RXTDIS | UART_PTCR_TXTDIS;
+
+	TWI_ConfigureMaster(twi, TWI_CLOCK, VARIANT_MCK);
+	status = MASTER_IDLE;
+}
+
+void TwoWire::begin(uint8_t address) {
+	if (onBeginCallback)
+		onBeginCallback();
+
+	// Disable PDC channel
+	twi->TWI_PTCR = UART_PTCR_RXTDIS | UART_PTCR_TXTDIS;
+
+	TWI_ConfigureSlave(twi, address);
+	status = SLAVE_IDLE;
+	TWI_EnableIt(twi, TWI_IER_SVACC);
+	//| TWI_IER_RXRDY | TWI_IER_TXRDY	| TWI_IER_TXCOMP);
+}
+
+void TwoWire::begin(int address) {
+	begin((uint8_t) address);
+}
+
+uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop) {
+	if (quantity > BUFFER_LENGTH)
+		quantity = BUFFER_LENGTH;
+
+	// perform blocking read into buffer
+	int readed = 0;
+	TWI_StartRead(twi, address, 0, 0);
+	do {
+		// Stop condition must be set during the reception of last byte
+		if (readed + 1 == quantity)
+			TWI_SendSTOPCondition( twi);
+
+		TWI_WaitByteReceived(twi, RECV_TIMEOUT);
+		rxBuffer[readed++] = TWI_ReadByte(twi);
+	} while (readed < quantity);
+	TWI_WaitTransferComplete(twi, RECV_TIMEOUT);
+
+	// set rx buffer iterator vars
+	rxBufferIndex = 0;
+	rxBufferLength = readed;
+
+	return readed;
+}
+
+uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity) {
+	return requestFrom((uint8_t) address, (uint8_t) quantity, (uint8_t) true);
+}
+
+uint8_t TwoWire::requestFrom(int address, int quantity) {
+	return requestFrom((uint8_t) address, (uint8_t) quantity, (uint8_t) true);
+}
+
+uint8_t TwoWire::requestFrom(int address, int quantity, int sendStop) {
+	return requestFrom((uint8_t) address, (uint8_t) quantity, (uint8_t) sendStop);
+}
+
+void TwoWire::beginTransmission(uint8_t address) {
+	status = MASTER_SEND;
+
+	// save address of target and empty buffer
+	txAddress = address;
+	txBufferLength = 0;
+}
+
+void TwoWire::beginTransmission(int address) {
+	beginTransmission((uint8_t) address);
+}
+
+//
+//	Originally, 'endTransmission' was an f(void) function.
+//	It has been modified to take one parameter indicating
+//	whether or not a STOP should be performed on the bus.
+//	Calling endTransmission(false) allows a sketch to
+//	perform a repeated start.
+//
+//	WARNING: Nothing in the library keeps track of whether
+//	the bus tenure has been properly ended with a STOP. It
+//	is very possible to leave the bus in a hung state if
+//	no call to endTransmission(true) is made. Some I2C
+//	devices will behave oddly if they do not see a STOP.
+//
+uint8_t TwoWire::endTransmission(uint8_t sendStop) {
+	// transmit buffer (blocking)
+	TWI_StartWrite(twi, txAddress, 0, 0, txBuffer[0]);
+	TWI_WaitByteSent(twi, XMIT_TIMEOUT);
+	int sent = 1;
+	while (sent < txBufferLength) {
+		TWI_WriteByte(twi, txBuffer[sent++]);
+		TWI_WaitByteSent(twi, XMIT_TIMEOUT);
+	}
+	TWI_Stop( twi);
+	TWI_WaitTransferComplete(twi, XMIT_TIMEOUT);
+
+	// empty buffer
+	txBufferLength = 0;
+
+	status = MASTER_IDLE;
+	return sent;
+}
+
+//	This provides backwards compatibility with the original
+//	definition, and expected behaviour, of endTransmission
+//
+uint8_t TwoWire::endTransmission(void)
+{
+	return endTransmission(true);
+}
+
+size_t TwoWire::write(uint8_t data) {
+	if (status == MASTER_SEND) {
+		if (txBufferLength >= BUFFER_LENGTH)
+			return 0;
+		txBuffer[txBufferLength++] = data;
+		return 1;
+	} else {
+		if (srvBufferLength >= BUFFER_LENGTH)
+			return 0;
+		srvBuffer[srvBufferLength++] = data;
+		return 1;
+	}
+}
+
+size_t TwoWire::write(const uint8_t *data, size_t quantity) {
+	if (status == MASTER_SEND) {
+		for (size_t i = 0; i < quantity; ++i) {
+			if (txBufferLength >= BUFFER_LENGTH)
+				return i;
+			txBuffer[txBufferLength++] = data[i];
+		}
+	} else {
+		for (size_t i = 0; i < quantity; ++i) {
+			if (srvBufferLength >= BUFFER_LENGTH)
+				return i;
+			srvBuffer[srvBufferLength++] = data[i];
+		}
+	}
+	return quantity;
+}
+
+int TwoWire::available(void) {
+	return rxBufferLength - rxBufferIndex;
+}
+
+int TwoWire::read(void) {
+	if (rxBufferIndex < rxBufferLength)
+		return rxBuffer[rxBufferIndex++];
+	return -1;
+}
+
+int TwoWire::peek(void) {
+	if (rxBufferIndex < rxBufferLength)
+		return rxBuffer[rxBufferIndex];
+	return -1;
+}
+
+void TwoWire::flush(void) {
+	// Do nothing, use endTransmission(..) to force
+	// data transfer.
+}
+
+void TwoWire::onReceive(void(*function)(int)) {
+	onReceiveCallback = function;
+}
+
+void TwoWire::onRequest(void(*function)(void)) {
+	onRequestCallback = function;
+}
+
+void TwoWire::onService(void) {
+	// Retrieve interrupt status
+	uint32_t sr = TWI_GetStatus(twi);
+
+	if (status == SLAVE_IDLE && TWI_STATUS_SVACC(sr)) {
+		TWI_DisableIt(twi, TWI_IDR_SVACC);
+		TWI_EnableIt(twi, TWI_IER_RXRDY | TWI_IER_GACC | TWI_IER_NACK
+				| TWI_IER_EOSACC | TWI_IER_SCL_WS | TWI_IER_TXCOMP);
+
+		srvBufferLength = 0;
+		srvBufferIndex = 0;
+
+		// Detect if we should go into RECV or SEND status
+		// SVREAD==1 means *master* reading -> SLAVE_SEND
+		if (!TWI_STATUS_SVREAD(sr)) {
+			status = SLAVE_RECV;
+		} else {
+			status = SLAVE_SEND;
+
+			// Alert calling program to generate a response ASAP
+			if (onRequestCallback)
+				onRequestCallback();
+			else
+				// create a default 1-byte response
+				write((uint8_t) 0);
+		}
+	}
+
+	if (status != SLAVE_IDLE) {
+		if (TWI_STATUS_TXCOMP(sr) && TWI_STATUS_EOSACC(sr)) {
+			if (status == SLAVE_RECV && onReceiveCallback) {
+				// Copy data into rxBuffer
+				// (allows to receive another packet while the
+				// user program reads actual data)
+				for (uint8_t i = 0; i < srvBufferLength; ++i)
+					rxBuffer[i] = srvBuffer[i];
+				rxBufferIndex = 0;
+				rxBufferLength = srvBufferLength;
+
+				// Alert calling program
+				onReceiveCallback( rxBufferLength);
+			}
+
+			// Transfer completed
+			TWI_EnableIt(twi, TWI_SR_SVACC);
+			TWI_DisableIt(twi, TWI_IDR_RXRDY | TWI_IDR_GACC | TWI_IDR_NACK
+					| TWI_IDR_EOSACC | TWI_IDR_SCL_WS | TWI_IER_TXCOMP);
+			status = SLAVE_IDLE;
+		}
+	}
+
+	if (status == SLAVE_RECV) {
+		if (TWI_STATUS_RXRDY(sr)) {
+			if (srvBufferLength < BUFFER_LENGTH)
+				srvBuffer[srvBufferLength++] = TWI_ReadByte(twi);
+		}
+	}
+
+	if (status == SLAVE_SEND) {
+		if (TWI_STATUS_TXRDY(sr) && !TWI_STATUS_NACK(sr)) {
+			uint8_t c = 'x';
+			if (srvBufferIndex < srvBufferLength)
+				c = srvBuffer[srvBufferIndex++];
+			TWI_WriteByte(twi, c);
+		}
+	}
+}
+
+#if WIRE_INTERFACES_COUNT > 0
+static void Wire_Init(void) {
+	pmc_enable_periph_clk(WIRE_INTERFACE_ID);
+	PIO_Configure(
+			g_APinDescription[PIN_WIRE_SDA].pPort,
+			g_APinDescription[PIN_WIRE_SDA].ulPinType,
+			g_APinDescription[PIN_WIRE_SDA].ulPin,
+			g_APinDescription[PIN_WIRE_SDA].ulPinConfiguration);
+	PIO_Configure(
+			g_APinDescription[PIN_WIRE_SCL].pPort,
+			g_APinDescription[PIN_WIRE_SCL].ulPinType,
+			g_APinDescription[PIN_WIRE_SCL].ulPin,
+			g_APinDescription[PIN_WIRE_SCL].ulPinConfiguration);
+
+	NVIC_DisableIRQ(TWI1_IRQn);
+	NVIC_ClearPendingIRQ(TWI1_IRQn);
+	NVIC_SetPriority(TWI1_IRQn, 0);
+	NVIC_EnableIRQ(TWI1_IRQn);
+}
+
+TwoWire Wire = TwoWire(WIRE_INTERFACE, Wire_Init);
+
+void WIRE_ISR_HANDLER(void) {
+	Wire.onService();
+}
+#endif
+
+#if WIRE_INTERFACES_COUNT > 1
+static void Wire1_Init(void) {
+	pmc_enable_periph_clk(WIRE1_INTERFACE_ID);
+	PIO_Configure(
+			g_APinDescription[PIN_WIRE1_SDA].pPort,
+			g_APinDescription[PIN_WIRE1_SDA].ulPinType,
+			g_APinDescription[PIN_WIRE1_SDA].ulPin,
+			g_APinDescription[PIN_WIRE1_SDA].ulPinConfiguration);
+	PIO_Configure(
+			g_APinDescription[PIN_WIRE1_SCL].pPort,
+			g_APinDescription[PIN_WIRE1_SCL].ulPinType,
+			g_APinDescription[PIN_WIRE1_SCL].ulPin,
+			g_APinDescription[PIN_WIRE1_SCL].ulPinConfiguration);
+
+	NVIC_DisableIRQ(TWI0_IRQn);
+	NVIC_ClearPendingIRQ(TWI0_IRQn);
+	NVIC_SetPriority(TWI0_IRQn, 0);
+	NVIC_EnableIRQ(TWI0_IRQn);
+}
+
+TwoWire Wire1 = TwoWire(WIRE1_INTERFACE, Wire1_Init);
+
+void WIRE1_ISR_HANDLER(void) {
+	Wire1.onService();
+}
+#endif

digistump-sam/libraries/Wire/Wire.h

@@ -0,0 +1,117 @@
+/*
+ * TwoWire.h - TWI/I2C library for Arduino Due
+ * Copyright (c) 2011 Cristian Maglie <c.maglie@bug.st>.
+ * All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef TwoWire_h
+#define TwoWire_h
+
+// Include Atmel CMSIS driver
+#include <include/twi.h>
+
+#include "Stream.h"
+#include "variant.h"
+
+#define BUFFER_LENGTH 32
+
+class TwoWire : public Stream {
+public:
+	TwoWire(Twi *twi, void(*begin_cb)(void));
+	void begin();
+	void begin(uint8_t);
+	void begin(int);
+	void beginTransmission(uint8_t);
+	void beginTransmission(int);
+	uint8_t endTransmission(void);
+    uint8_t endTransmission(uint8_t);
+	uint8_t requestFrom(uint8_t, uint8_t);
+    uint8_t requestFrom(uint8_t, uint8_t, uint8_t);
+	uint8_t requestFrom(int, int);
+    uint8_t requestFrom(int, int, int);
+	virtual size_t write(uint8_t);
+	virtual size_t write(const uint8_t *, size_t);
+	virtual int available(void);
+	virtual int read(void);
+	virtual int peek(void);
+	virtual void flush(void);
+	void onReceive(void(*)(int));
+	void onRequest(void(*)(void));
+
+    inline size_t write(unsigned long n) { return write((uint8_t)n); }
+    inline size_t write(long n) { return write((uint8_t)n); }
+    inline size_t write(unsigned int n) { return write((uint8_t)n); }
+    inline size_t write(int n) { return write((uint8_t)n); }
+    using Print::write;
+
+	void onService(void);
+
+private:
+	// RX Buffer
+	uint8_t rxBuffer[BUFFER_LENGTH];
+	uint8_t rxBufferIndex;
+	uint8_t rxBufferLength;
+
+	// TX Buffer
+	uint8_t txAddress;
+	uint8_t txBuffer[BUFFER_LENGTH];
+	uint8_t txBufferLength;
+
+	// Service buffer
+	uint8_t srvBuffer[BUFFER_LENGTH];
+	uint8_t srvBufferIndex;
+	uint8_t srvBufferLength;
+
+	// Callback user functions
+	void (*onRequestCallback)(void);
+	void (*onReceiveCallback)(int);
+
+	// Called before initialization
+	void (*onBeginCallback)(void);
+
+	// TWI instance
+	Twi *twi;
+
+	// TWI state
+	enum TwoWireStatus {
+		UNINITIALIZED,
+		MASTER_IDLE,
+		MASTER_SEND,
+		MASTER_RECV,
+		SLAVE_IDLE,
+		SLAVE_RECV,
+		SLAVE_SEND
+	};
+	TwoWireStatus status;
+
+	// TWI clock frequency
+	static const uint32_t TWI_CLOCK = 100000;
+
+	// Timeouts (
+	static const uint32_t RECV_TIMEOUT = 100000;
+	static const uint32_t XMIT_TIMEOUT = 100000;
+};
+
+#if WIRE_INTERFACES_COUNT > 0
+extern TwoWire Wire;
+#endif
+#if WIRE_INTERFACES_COUNT > 1
+extern TwoWire Wire1;
+#endif
+
+#endif
+

digistump-sam/libraries/Wire/examples/SFRRanger_reader/SFRRanger_reader.pde

@@ -0,0 +1,87 @@
+// I2C SRF10 or SRF08 Devantech Ultrasonic Ranger Finder 
+// by Nicholas Zambetti <http://www.zambetti.com>
+// and James Tichenor <http://www.jamestichenor.net> 
+
+// Demonstrates use of the Wire library reading data from the 
+// Devantech Utrasonic Rangers SFR08 and SFR10
+
+// Created 29 April 2006
+
+// This example code is in the public domain.
+
+
+#include <Wire.h>
+
+void setup()
+{
+  Wire.begin();                // join i2c bus (address optional for master)
+  Serial.begin(9600);          // start serial communication at 9600bps
+}
+
+int reading = 0;
+
+void loop()
+{
+  // step 1: instruct sensor to read echoes
+  Wire.beginTransmission(112); // transmit to device #112 (0x70)
+                               // the address specified in the datasheet is 224 (0xE0)
+                               // but i2c adressing uses the high 7 bits so it's 112
+  Wire.write(byte(0x00));      // sets register pointer to the command register (0x00)  
+  Wire.write(byte(0x50));      // command sensor to measure in "inches" (0x50) 
+                               // use 0x51 for centimeters
+                               // use 0x52 for ping microseconds
+  Wire.endTransmission();      // stop transmitting
+
+  // step 2: wait for readings to happen
+  delay(70);                   // datasheet suggests at least 65 milliseconds
+
+  // step 3: instruct sensor to return a particular echo reading
+  Wire.beginTransmission(112); // transmit to device #112
+  Wire.write(byte(0x02));      // sets register pointer to echo #1 register (0x02)
+  Wire.endTransmission();      // stop transmitting
+
+  // step 4: request reading from sensor
+  Wire.requestFrom(112, 2);    // request 2 bytes from slave device #112
+
+  // step 5: receive reading from sensor
+  if(2 <= Wire.available())    // if two bytes were received
+  {
+    reading = Wire.read();  // receive high byte (overwrites previous reading)
+    reading = reading << 8;    // shift high byte to be high 8 bits
+    reading |= Wire.read(); // receive low byte as lower 8 bits
+    Serial.println(reading);   // print the reading
+  }
+
+  delay(250);                  // wait a bit since people have to read the output :)
+}
+
+
+/*
+
+// The following code changes the address of a Devantech Ultrasonic Range Finder (SRF10 or SRF08)
+// usage: changeAddress(0x70, 0xE6);
+
+void changeAddress(byte oldAddress, byte newAddress)
+{
+  Wire.beginTransmission(oldAddress);
+  Wire.write(byte(0x00));
+  Wire.write(byte(0xA0));
+  Wire.endTransmission();
+
+  Wire.beginTransmission(oldAddress);
+  Wire.write(byte(0x00));
+  Wire.write(byte(0xAA));
+  Wire.endTransmission();
+
+  Wire.beginTransmission(oldAddress);
+  Wire.write(byte(0x00));
+  Wire.write(byte(0xA5));
+  Wire.endTransmission();
+
+  Wire.beginTransmission(oldAddress);
+  Wire.write(byte(0x00));
+  Wire.write(newAddress);
+  Wire.endTransmission();
+}
+
+*/

digistump-sam/libraries/Wire/examples/digital_potentiometer/digital_potentiometer.pde

@@ -0,0 +1,39 @@
+// I2C Digital Potentiometer
+// by Nicholas Zambetti <http://www.zambetti.com>
+// and Shawn Bonkowski <http://people.interaction-ivrea.it/s.bonkowski/>
+
+// Demonstrates use of the Wire library
+// Controls AD5171 digital potentiometer via I2C/TWI
+
+// Created 31 March 2006
+
+// This example code is in the public domain.
+
+// This example code is in the public domain.
+
+
+#include <Wire.h>
+
+void setup()
+{
+  Wire.begin(); // join i2c bus (address optional for master)
+}
+
+byte val = 0;
+
+void loop()
+{
+  Wire.beginTransmission(44); // transmit to device #44 (0x2c)
+                              // device address is specified in datasheet
+  Wire.write(byte(0x00));            // sends instruction byte  
+  Wire.write(val);             // sends potentiometer value byte  
+  Wire.endTransmission();     // stop transmitting
+
+  val++;        // increment value
+  if(val == 64) // if reached 64th position (max)
+  {
+    val = 0;    // start over from lowest value
+  }
+  delay(500);
+}
+

digistump-sam/libraries/Wire/examples/master_reader/master_reader.pde

@@ -0,0 +1,32 @@
+// Wire Master Reader
+// by Nicholas Zambetti <http://www.zambetti.com>
+
+// Demonstrates use of the Wire library
+// Reads data from an I2C/TWI slave device
+// Refer to the "Wire Slave Sender" example for use with this
+
+// Created 29 March 2006
+
+// This example code is in the public domain.
+
+
+#include <Wire.h>
+
+void setup()
+{
+  Wire.begin();        // join i2c bus (address optional for master)
+  Serial.begin(9600);  // start serial for output
+}
+
+void loop()
+{
+  Wire.requestFrom(2, 6);    // request 6 bytes from slave device #2
+
+  while(Wire.available())    // slave may send less than requested
+  { 
+    char c = Wire.read(); // receive a byte as character
+    Serial.print(c);         // print the character
+  }
+
+  delay(500);
+}

digistump-sam/libraries/Wire/examples/master_writer/master_writer.pde

@@ -0,0 +1,31 @@
+// Wire Master Writer
+// by Nicholas Zambetti <http://www.zambetti.com>
+
+// Demonstrates use of the Wire library
+// Writes data to an I2C/TWI slave device
+// Refer to the "Wire Slave Receiver" example for use with this
+
+// Created 29 March 2006
+
+// This example code is in the public domain.
+
+
+#include <Wire.h>
+
+void setup()
+{
+  Wire.begin(); // join i2c bus (address optional for master)
+}
+
+byte x = 0;
+
+void loop()
+{
+  Wire.beginTransmission(4); // transmit to device #4
+  Wire.write("x is ");        // sends five bytes
+  Wire.write(x);              // sends one byte  
+  Wire.endTransmission();    // stop transmitting
+
+  x++;
+  delay(500);
+}

digistump-sam/libraries/Wire/examples/slave_receiver/slave_receiver.pde

@@ -0,0 +1,38 @@
+// Wire Slave Receiver
+// by Nicholas Zambetti <http://www.zambetti.com>
+
+// Demonstrates use of the Wire library
+// Receives data as an I2C/TWI slave device
+// Refer to the "Wire Master Writer" example for use with this
+
+// Created 29 March 2006
+
+// This example code is in the public domain.
+
+
+#include <Wire.h>
+
+void setup()
+{
+  Wire.begin(4);                // join i2c bus with address #4
+  Wire.onReceive(receiveEvent); // register event
+  Serial.begin(9600);           // start serial for output
+}
+
+void loop()
+{
+  delay(100);
+}
+
+// function that executes whenever data is received from master
+// this function is registered as an event, see setup()
+void receiveEvent(int howMany)
+{
+  while(1 < Wire.available()) // loop through all but the last
+  {
+    char c = Wire.read(); // receive byte as a character
+    Serial.print(c);         // print the character
+  }
+  int x = Wire.read();    // receive byte as an integer
+  Serial.println(x);         // print the integer
+}

digistump-sam/libraries/Wire/examples/slave_sender/slave_sender.pde

@@ -0,0 +1,32 @@
+// Wire Slave Sender
+// by Nicholas Zambetti <http://www.zambetti.com>
+
+// Demonstrates use of the Wire library
+// Sends data as an I2C/TWI slave device
+// Refer to the "Wire Master Reader" example for use with this
+
+// Created 29 March 2006
+
+// This example code is in the public domain.
+
+
+#include <Wire.h>
+
+void setup()
+{
+  Wire.begin(2);                // join i2c bus with address #2
+  Wire.onRequest(requestEvent); // register event
+}
+
+void loop()
+{
+  delay(100);
+}
+
+// function that executes whenever data is requested by master
+// this function is registered as an event, see setup()
+void requestEvent()
+{
+  Wire.write("hello "); // respond with message of 6 bytes
+                       // as expected by master
+}

digistump-sam/libraries/Wire/keywords.txt

@@ -0,0 +1,32 @@
+#######################################
+# Syntax Coloring Map For Wire
+#######################################
+
+#######################################
+# Datatypes (KEYWORD1)
+#######################################
+
+#######################################
+# Methods and Functions (KEYWORD2)
+#######################################
+
+begin	KEYWORD2
+beginTransmission	KEYWORD2
+endTransmission	KEYWORD2
+requestFrom	KEYWORD2
+send	KEYWORD2
+receive	KEYWORD2
+onReceive	KEYWORD2
+onRequest	KEYWORD2
+
+#######################################
+# Instances (KEYWORD2)
+#######################################
+
+Wire	KEYWORD2
+Wire1	KEYWORD2
+
+#######################################
+# Constants (LITERAL1)
+#######################################
+