///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

slave msp430G2553  


////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////



#include <msp430.h>
#include <stdbool.h>

#include <math.h>
#include <float.h>
#include <stdlib.h>
/*
 * main.c
 */

const unsigned char TxData[] =              // Table of data to transmit
{
  0x11,
  0x22,
  0x33,
  0x44,
  0x55
};

#define CRC_KEY 7
#define DELAY_LIMIT 0xffff

void ClockInitialise()
{
	DCOCTL = 0xE0;	//DCO = 7, MOD = 0

	BCSCTL1 &= 0x8F;  //RSEL = 0, DCOR = 0, 20MHz Clock

	BCSCTL2 = 0x0;

	BCSCTL3 = 0;
}

void I2CInitialise()
{
	P1SEL |= BIT6 + BIT7;                     // Assign I2C pins to USCI_B0, P1.6 for SCL and P1.7 for SDA
	P1SEL2|= BIT6 + BIT7;                     // Assign I2C pins to USCI_B0, P1.6 for SCL and P1.7 for SDA



	UCB0CTL1 |= UCSWRST;                      // Enable SW reset, hold USCI logic in reset state
	UCB0CTL0 = UCMODE_3 + UCSYNC;			//set to I2C mode, sync=1
    UCB0CTL1 |= UCSSEL_2;                       // Use SMCLK

	UCB0BR0 = 4;                        // fSCL = SMCLK/12 = ~100kHz  10 for 100KHz 4 for 400KHz
	UCB0BR1 = 0;


	UCB0I2CIE = 0;
    IE2 &= ~(UCB0TXIE + UCB0RXIE);	//disable interrupts

   // UCB0CTL1 |= UCSSEL_2;
    UCB0CTL1 &= ~UCSWRST;
}

int I2CSendByte(unsigned char I2CSlaveAddress, unsigned char data)
{
	unsigned long int DelayCounter = 0;

	UCB0CTL0 = UCMODE_3 + UCSYNC;             // I2C Slave, synchronous mode
	UCB0I2COA = I2CSlaveAddress;

	 UCB0CTL1 |= UCTR; //data in transmit direction
	 UCB0CTL1 |= UCTXSTT; //Generate Start Condition
	 	 	 	 	 	  //Send Start Byte

	 while(!(IFG2 & UCB0TXIFG))  //if UCB0TXIFG != 0, wait here
	 {
		 DelayCounter ++;
		 if (DelayCounter >= DELAY_LIMIT)
			 break;
	 }

	 if (DelayCounter >= DELAY_LIMIT)
		 return -1;

	 UCB0TXBUF = data;				// send the data

	 DelayCounter = 0;

	 while(DelayCounter < DELAY_LIMIT && !(IFG2 & UCB0TXIFG))
	 {
		 DelayCounter++;
	 }

	 if (DelayCounter >= DELAY_LIMIT)
		 return -1;

	 UCB0CTL1 |= UCTXSTP;			//send stop bit

	 DelayCounter = 0;

	/* while(DelayCounter < DELAY_LIMIT && (UCB0CTL1 & UCTXSTP))
	 {
		 DelayCounter++;
	 }*/

	 if (DelayCounter >= DELAY_LIMIT)	//check if NACK condition occurred
		 return -1;
	 else
		 return 0;

}

int I2CSendBytes(unsigned char I2CSlaveAddress, unsigned char *DataBuffer, unsigned int ByteCount, unsigned int *SentByte)
{
	unsigned long int DelayCounter = 0;
    unsigned int NumberOfBytesSent = 0;
    unsigned char *DataPointer;

    UCB0CTL0 = UCMODE_3 + UCSYNC;             // I2C Slave, synchronous mode
	UCB0I2COA = I2CSlaveAddress;

     DataPointer = DataBuffer;

	 UCB0CTL1 |= UCTR; //data in transmit direction
	 UCB0CTL1 |= UCTXSTT; //Generate Start Condition
	 	 	 	 	 	  //Send Start Byte

	 while(!(IFG2 & UCB0TXIFG))  //if UCTXSTT != 0, wait here
	 {
		 DelayCounter ++;
		 if (DelayCounter > DELAY_LIMIT)
			 break;
	 }

	 if (DelayCounter >= DELAY_LIMIT)   //check if NACK condition occurred
	 {
		 *SentByte = NumberOfBytesSent;
		 UCB0CTL1 |= UCTXSTP;
		 return -1;
	 }

	 for(NumberOfBytesSent = 0; NumberOfBytesSent < ByteCount; NumberOfBytesSent++)
	 {
		 UCB0TXBUF= *DataPointer;

		 DelayCounter = 0;

		 while(DelayCounter < DELAY_LIMIT && (!(IFG2 & UCB0TXIFG) || (UCB0CTL1 & UCTXSTT)))	//check if the byte has been sent
		 {
			 DelayCounter++;
		 }

		 if (DelayCounter >= DELAY_LIMIT)	//check if NACK condition occurred
		 {
			 *SentByte = NumberOfBytesSent;
			 UCB0CTL1 |= UCTXSTP;				//send stop condition
			 return -1;
		 }

		 DataPointer++;
	 }

	 IFG2 &= ~UCB0TXIFG;
	 UCB0CTL1 |= UCTXSTP;		//send stop bit

	 DelayCounter = 0;

	 while(DelayCounter < DELAY_LIMIT && ((UCB0CTL1 & UCTXSTP)))
	 {
		 DelayCounter++;
	 }

	 *SentByte =  NumberOfBytesSent;

	 if (DelayCounter >= DELAY_LIMIT)	//check if NACK condition occurred
	 {
		 UCB0CTL1 |= UCSWRST;
		 return -1;
	 }
	 else
		 return 0;
}

int I2CWriteRegisterByte(unsigned char I2CSlaveAddress, unsigned char Register, unsigned char Data)
{
	unsigned char DataBuffer[2];
	unsigned int SentByte = 0;


	DataBuffer[0] = Register;
	DataBuffer[1] = Data;

	return(I2CSendBytes(I2CSlaveAddress, DataBuffer, 2, &SentByte));
}

int I2CWriteRegisterByteWithCRC(unsigned char I2CSlaveAddress, unsigned char Register, unsigned char Data)
{
	unsigned char DataBuffer[4];
	unsigned int SentByte = 0;

    DataBuffer[0] = I2CSlaveAddress << 1;
	DataBuffer[1] = Register;
	DataBuffer[2] = Data;
	DataBuffer[3] = CRC8(DataBuffer, 3, CRC_KEY);

	return(I2CSendBytes(I2CSlaveAddress, DataBuffer + 1, 3, &SentByte));
}

int I2CWriteRegisterWordWithCRC(unsigned char I2CSlaveAddress, unsigned char Register, unsigned int Data)
{
	unsigned char DataBuffer[6];
	unsigned int SentByte = 0;

    DataBuffer[0] = I2CSlaveAddress << 1;
	DataBuffer[1] = Register;
	DataBuffer[2] = LOW_BYTE(Data);
	DataBuffer[3] = CRC8(DataBuffer, 3, CRC_KEY);
	DataBuffer[4] = HIGH_BYTE(Data);
	DataBuffer[5] = CRC8(DataBuffer + 4, 1, CRC_KEY);

	return(I2CSendBytes(I2CSlaveAddress, DataBuffer + 1, 5, &SentByte));
}

int I2CWriteBlockWithCRC(unsigned char I2CSlaveAddress, unsigned char StartAddress, unsigned char *Buffer, unsigned char Length)
{
	unsigned char *BufferCRC, *Pointer;
	int i;
	unsigned int SentByte = 0;
	int result;

	BufferCRC = (unsigned char*)malloc(2*Length + 2);
	if (NULL == BufferCRC)
		return -1;

	Pointer = BufferCRC;
	*Pointer = I2CSlaveAddress << 1;
	Pointer++;
	*Pointer = StartAddress;
	Pointer++;
	*Pointer = *Buffer;
	Pointer++;
	*Pointer = CRC8(BufferCRC, 3, CRC_KEY);

	for(i = 1; i < Length; i++)
	{
        Pointer++;
        Buffer++;
        *Pointer = *Buffer;
		*(Pointer + 1) = CRC8(Pointer, 1, CRC_KEY);
		Pointer++;
	}

	result = I2CSendBytes(I2CSlaveAddress, BufferCRC + 1, 2*Length + 1, &SentByte);

	free(BufferCRC);
	BufferCRC = NULL;

	return result;
}

int I2CWriteRegisterWord(unsigned char I2CSlaveAddress, unsigned char Register, unsigned int Data)
{
	unsigned char DataBuffer[3];
	unsigned int SentByte = 0;

	DataBuffer[0] = Register;
	DataBuffer[1] = LOWBYTE(Data);
	DataBuffer[2] = HIGHBYTE(Data);

	return(I2CSendBytes(I2CSlaveAddress, DataBuffer, 3, &SentByte));
}

int I2CReadBytes(unsigned char I2CSlaveAddress, unsigned char *DataBuffer, unsigned int ExpectedByteNumber, unsigned int *NumberOfReceivedBytes)
{
	unsigned long int DelayCounter = 0;
    unsigned char *DataPointer;
    unsigned int *NumberOfReceivedBytesPointer;

    NumberOfReceivedBytesPointer = NumberOfReceivedBytes;
    *NumberOfReceivedBytesPointer = 0;

    UCB0CTL0 = UCMODE_3 + UCSYNC;             // I2C Slave, synchronous mode

    DataPointer = DataBuffer;
    UCB0I2COA = I2CSlaveAddress;

	UCB0CTL1 &= ~(UCTR); //data in receive direction

	UCB0CTL1 |= UCTXSTT; //Generate Start Condition

	 while((UCB0CTL1 & UCTXSTT)
			 )  //if UCTXSTT != 0, wait here
	 {
		 DelayCounter ++;
		 if (DelayCounter >= DELAY_LIMIT)
			 break;
	 }

	 if (DelayCounter >= DELAY_LIMIT || UCB0STAT & UCNACKIFG)   //check if NACK condition occurred
		 return -1;

	 for(*NumberOfReceivedBytesPointer = 0; *NumberOfReceivedBytesPointer < ExpectedByteNumber; (*NumberOfReceivedBytesPointer)++)
	 {
		 if(*NumberOfReceivedBytesPointer + 1 == ExpectedByteNumber)
			 UCB0CTL1 |= UCTXSTP;

		 DelayCounter = 0;

		 while(DelayCounter < DELAY_LIMIT && !(IFG2 & UCB0RXIFG))
		 {
			 DelayCounter++;
		 }

		 if(DelayCounter == DELAY_LIMIT)
		 {
			 UCB0CTL1 |= UCSWRST;   //if I2C overtime condition occurred, reset I2C engine
			 return -1;
		 }

		 *DataPointer = UCB0RXBUF;

		 DataPointer++;
	 }

	 DelayCounter = 0;
	 while(DelayCounter < DELAY_LIMIT && (UCB0CTL1 & UCTXSTP))
	 {
		 DelayCounter++;
	 }

	 if(DelayCounter >= DELAY_LIMIT)
	 {
		 UCB0CTL1 |= UCSWRST;
		 return -1;
	 }

	 return 0;

}

int I2CReadRegisterByte(unsigned char I2CSlaveAddress, unsigned char Register, unsigned char *Data)
{
	unsigned char TargetRegister = Register;
	unsigned int SentByte = 0;
	unsigned int ReadDataCount = 0;
    int ReadStatus = 0;
    int WriteStatus = 0;

	WriteStatus = I2CSendBytes(I2CSlaveAddress, &TargetRegister, 1, &SentByte);

	ReadStatus = I2CReadBytes(I2CSlaveAddress, Data, 1, &ReadDataCount);

	if (ReadStatus != 0 || WriteStatus != 0)
	{
		return -1;
	}

	return 0;
}

int I2CReadBlock(unsigned char I2CSlaveAddress, unsigned char StartRegisterAddress, unsigned char *Buffer, unsigned int BlockSize, unsigned int *NumberOfBytes)
{
	unsigned char TargetRegister = StartRegisterAddress;
	unsigned int SentByte = 0;
	int ReadStatus = 0;
	int WriteStatus = 0;

	WriteStatus = I2CSendBytes(I2CSlaveAddress, &TargetRegister, 1, &SentByte);

	ReadStatus = I2CReadBytes(I2CSlaveAddress, Buffer, BlockSize, NumberOfBytes);

	if(ReadStatus != 0 || WriteStatus != 0)
	{
		return -1;
	}

	return 0;
}

unsigned char CRC8(unsigned char *ptr, unsigned char len,unsigned char key)
{
	unsigned char i;
	unsigned char crc=0;
	while(len--!=0)
	{
		for(i=0x80; i!=0; i/=2)
		{
			if((crc & 0x80) != 0)
			{
				crc *= 2;
				crc ^= key;
			}
			else
				crc *= 2;

			if((*ptr & i)!=0)
				crc ^= key;
		}
		ptr++;
	}
	return(crc);
}




int I2CReadRegisterByteWithCRC(unsigned char I2CSlaveAddress, unsigned char Register, unsigned char *Data)
{
	unsigned char TargetRegister = Register;
	unsigned int SentByte = 0;
	unsigned char ReadData[2];
	unsigned int ReadDataCount = 0;
	unsigned char CRCInput[2];
	unsigned char CRC = 0;
    int ReadStatus = 0;
    int WriteStatus = 0;

	WriteStatus = I2CSendBytes(I2CSlaveAddress, &TargetRegister, 1, &SentByte);

	ReadStatus = I2CReadBytes(I2CSlaveAddress, ReadData, 2, &ReadDataCount);

	if (ReadStatus != 0 || WriteStatus != 0)
	{
		return -1;
	}

	CRCInput[0] = (I2CSlaveAddress << 1) + 1;
	CRCInput[1] = ReadData[0];

	CRC = CRC8(CRCInput, 2, CRC_KEY);

	if (CRC != ReadData[1])
		return -1;

	*Data = ReadData[0];
	return 0;
}

int I2CReadRegisterWordWithCRC(unsigned char I2CSlaveAddress, unsigned char Register, unsigned int *Data)
{
	unsigned char TargetRegister = Register;
	unsigned int SentByte = 0;
	unsigned char ReadData[4];
	unsigned int ReadDataCount = 0;
	unsigned char CRCInput[2];
	unsigned char CRC = 0;
    int ReadStatus = 0;
    int WriteStatus = 0;

	WriteStatus = I2CSendBytes(I2CSlaveAddress, &TargetRegister, 1, &SentByte);

	ReadStatus = I2CReadBytes(I2CSlaveAddress, ReadData, 4, &ReadDataCount);

	if (ReadStatus != 0 || WriteStatus != 0)
	{
		return -1;
	}

	CRCInput[0] = (I2CSlaveAddress << 1) + 1;
	CRCInput[1] = ReadData[0];

	CRC = CRC8(CRCInput, 2, CRC_KEY);

	if (CRC != ReadData[1])
		return -1;

	CRC = CRC8(ReadData + 2, 1, CRC_KEY);

	if (CRC != ReadData[3])
		return -1;

	*Data = ReadData[0];

	*Data = (*Data << 8) + ReadData[2];

	return 0;
}

int I2CReadBlockWithCRC(unsigned char I2CSlaveAddress, unsigned char Register, unsigned char *Buffer, unsigned char Length)
{
	unsigned char TargetRegister = Register;
	unsigned int SentByte = 0;
	unsigned char *ReadData = NULL, *StartData = NULL;
	unsigned int ReadDataCount = 0;
	unsigned char CRCInput[2];
	unsigned char CRC = 0;
    int ReadStatus = 0;
    int WriteStatus = 0;
    int i;

    StartData = (unsigned char *)malloc(2 * Length);

    if (NULL == StartData)
    	return -1;

    ReadData = StartData;

	WriteStatus = I2CSendBytes(I2CSlaveAddress, &TargetRegister, 1, &SentByte);

	ReadStatus = I2CReadBytes(I2CSlaveAddress, ReadData, 2 * Length, &ReadDataCount);

	if (ReadStatus != 0 || WriteStatus != 0)
	{
		free(StartData);
		StartData = NULL;

		return -1;
	}

	CRCInput[0] = (I2CSlaveAddress << 1) + 1;
	CRCInput[1] = *ReadData;

	CRC = CRC8(CRCInput, 2, CRC_KEY);

	ReadData++;
	if (CRC != *ReadData)
	{
		free(StartData);
		StartData = NULL;
		return -1;
	}
	else
		*Buffer = *(ReadData - 1);

	for(i = 1; i < Length; i++)
	{
		ReadData++;
		CRC = CRC8(ReadData, 1, CRC_KEY);
		ReadData++;
		Buffer++;

		if (CRC != *ReadData)
		{
			free(StartData);
			StartData = NULL;

			return -1;
		}
		else
			*Buffer = *(ReadData - 1);
	}

	free(StartData);
	StartData = NULL;

	return 0;
}

int main(void)
{
	int Result;
int i,a;
    WDTCTL = WDTPW | WDTHOLD;	// Stop watchdog timer

   // DISABLE_INT;

   //ClockInitialise();


    I2CInitialise();

int count = 0;

    while(1)
    {
        for( i=0 ; i<5 ;i++)
        {

         //   I2CSendByte(0x48,TxData[i]);

           I2CWriteRegisterByteWithCRC(0x48, TxData[i],TxData[i]);

        }
      //  i=0;
        // I2CWriteRegisterByteWithCRC(0x48, 0x41, 0x42)


count++;

    }

	return Result;
}








///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

master tm4c1294ncpdt


////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////




#include <stdint.h>
#include <stdbool.h>
#include "driverlib/debug.h"
#include "inc/hw_types.h"
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "driverlib/gpio.h"
#include "driverlib/i2c.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"
#include "utils/uartstdio.h"

#define SLAVE_ADDRESS_EXT  0x48
//uint8_t Checksum;
#define NUM_OF_I2CBYTES   5    //RX_Bytes

uint8_t Command  =   0x03;       //TX_Command

//*****************************************************************************
//
// Enumerated Data Types for Master State Machine
//
//*****************************************************************************
enum I2C_MASTER_STATE
{
    I2C_OP_IDLE = 0,
    I2C_OP_RXDATA,
    I2C_OP_STOP,

};

//*****************************************************************************
//
// Global variable for Delay Count
//
//*****************************************************************************
volatile uint16_t data;
volatile uint8_t  g_ui8MasterTxData[1];
volatile uint16_t  g_ui8MasterRxData[NUM_OF_I2CBYTES];
volatile uint8_t  g_ui8MasterCurrState;
volatile uint8_t  g_ui8MasterPrevState;
volatile bool     g_bI2CRepeatedStart;
volatile uint8_t  g_ui8MasterBytes       = NUM_OF_I2CBYTES;
volatile uint8_t  g_ui8MasterBytesLength = NUM_OF_I2CBYTES;

uint32_t ui32I2CMasterInterruptStatus;

//*****************************************************************************
//
// Interrupt Handler for I2C Master Interface
//
//*****************************************************************************
void
I2C2IntHandler(void)
{

    //
    // Toggle PL4 High to Indicate Entry to ISR
    //
    GPIOPinWrite(GPIO_PORTL_BASE, GPIO_PIN_4, GPIO_PIN_4);

    //
    // Get the masked interrupt status and clear the flags
    //
    ui32I2CMasterInterruptStatus = I2CMasterIntStatusEx(I2C2_BASE, true);
    I2CMasterIntClearEx(I2C2_BASE, ui32I2CMasterInterruptStatus);


    //
    // Execute the State Machine
    //
    switch (g_ui8MasterCurrState) {
    case I2C_OP_IDLE:
        //
        // Move from IDLE to Transmit Address State
        //
        g_ui8MasterPrevState = g_ui8MasterCurrState;

        //
        // Write the upper bits of the page to the Slave
        //
        I2CMasterSlaveAddrSet(I2C2_BASE, SLAVE_ADDRESS_EXT, false);
        I2CMasterDataPut(I2C2_BASE, 0x01);
        I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_SINGLE_SEND);
        g_ui8MasterCurrState = I2C_OP_STOP;

        break;


    case I2C_OP_RXDATA:
        //
        // Move the current state to the previous state
        // Else continue with the transmission till last byte
        //
        g_ui8MasterPrevState = g_ui8MasterCurrState;


        //
        // If Address has been NAK'ed then go to stop state
        // If a Stop condition is seen due to number of bytes getting
        // done then move to STOP state and read the last data byte
        //
        if(ui32I2CMasterInterruptStatus & I2C_MASTER_INT_NACK)
        {
            g_ui8MasterCurrState = I2C_OP_STOP;
        }
        else if(ui32I2CMasterInterruptStatus & I2C_MASTER_INT_STOP)
        {
            g_ui8MasterCurrState = I2C_OP_STOP;
            g_ui8MasterRxData[g_ui8MasterBytes++] = I2CMasterDataGet(I2C2_BASE);
           // UARTprintf("Received--1: '%x'\n",g_ui8MasterRxData[g_ui8MasterBytes]);
        }
        else
        {
            //
            // If end then NAK the byte and put Stop. Else continue
            // with ACK of the current byte and receive the next byte
            //
            if(g_bI2CRepeatedStart)
            {
                //
                // Send the Slave Address with RnW as Receive. If only byte is
                // to be received then send START and STOP else send START
                //
                I2CMasterSlaveAddrSet(I2C2_BASE, SLAVE_ADDRESS_EXT, true);
                if(g_ui8MasterBytesLength == 1)
                {
                    I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_SINGLE_RECEIVE);
                }
                else
                {
                    I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START);
                }

                //
                // Change the Repeated Start Flag to false as the condition
                // is now to receive data
                //
                g_bI2CRepeatedStart = false;
            }
            else if(g_ui8MasterBytes == (g_ui8MasterBytesLength - 2))
            {
                //
                // Read the byte from I2C Buffer and decrement the number
                // of bytes counter to see if end has been reached or not
                //
                g_ui8MasterRxData[g_ui8MasterBytes++] = I2CMasterDataGet(I2C2_BASE);

              // UARTprintf("Received---2: '%x'\n",g_ui8MasterRxData[g_ui8MasterBytes]);
              // SysCtlDelay(120000);
               //
                // Put a STOP Condition on the bus
                //
                I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
            }
            else
            {
                //
                // Read the byte from I2C Buffer and decrement the number
                // of bytes counter to see if end has been reached or not
                //
                g_ui8MasterRxData[g_ui8MasterBytes++] = I2CMasterDataGet(I2C2_BASE);

                I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);
            }
        }

        break;
    case I2C_OP_STOP:
        //
        // Move the current state to the previous state
        // Else continue with the transmission till last byte
        //
        g_ui8MasterPrevState = g_ui8MasterCurrState;

        break;

    default:

        break;
    }



    //
    // Toggle PL4 Low to Indicate Exit from ISR
    //
    GPIOPinWrite(GPIO_PORTL_BASE, GPIO_PIN_4, 0x0);
}

//*****************************************************************************
//
// This function sets up UART0 to be used for a console to display information
// as the example is running.
//
//*****************************************************************************
void
InitConsole(void)
{

    //
    // Enable GPIO port A which is used for UART0 pins.
    // TODO: change this to whichever GPIO port you are using.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

    //
    // Configure the pin muxing for UART0 functions on port A0 and A1.
    // This step is not necessary if your part does not support pin muxing.
    // TODO: change this to select the port/pin you are using.
    //
    GPIOPinConfigure(GPIO_PA0_U0RX);
    GPIOPinConfigure(GPIO_PA1_U0TX);

    //
    // Enable UART0 so that we can configure the clock.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);

    //
    // Use the internal 16MHz oscillator as the UART clock source.
    //
    UARTClockSourceSet(UART0_BASE, UART_CLOCK_PIOSC);

    //
    // Select the alternate (UART) function for these pins.
    // TODO: change this to select the port/pin you are using.
    //
    GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

    //
    // Initialize the UART for console I/O.
    //
    UARTStdioConfig(0, 115200, 16000000);
}

//*****************************************************************************
//
// Main Program to Configure and Use the I2C Master
//
//*****************************************************************************
int
main(void)
{
    uint32_t ui32SysClock;
    uint8_t  ui8Count;
    bool     bError;

    //
     // Setup System Clock for 120MHz
     //
     ui32SysClock = SysCtlClockFreqSet((SYSCTL_OSC_MAIN | SYSCTL_USE_PLL | SYSCTL_XTAL_25MHZ |
                         SYSCTL_CFG_VCO_480), 120000000);

    //
    // Set up the serial console to use for displaying messages.  This is
    // just for this example program and is not needed for EPI operation.
    //
    InitConsole();

    initI2C(ui32SysClock);



    //
    // Initialize and Configure the Master Module State Machine
    //

    while(1)
    {

   //////////// for TX Command //////////////

/*

        g_ui8MasterCurrState = I2C_OP_IDLE;
        while(I2CMasterBusBusy(I2C2_BASE));
     //   g_ui8MasterBytes       = 0;

        //UARTprintf("Transmit %x bytes to external Slave...\n\n",Command);

        //
        // Trigger the Transfer using Software Interrupt
        //
        IntTrigger(INT_I2C2);
        while(g_ui8MasterCurrState != I2C_OP_STOP);



        SysCtlDelay(1000);

*/

     //////////// for RX Data //////////////

        g_ui8MasterCurrState = I2C_OP_RXDATA;
        g_bI2CRepeatedStart    = true;
        g_ui8MasterBytes       = 0;

        //
        // Trigger the Transfer using Software Interrupt
        //
        IntTrigger(INT_I2C2);
        while(g_ui8MasterCurrState != I2C_OP_STOP);
        g_ui8MasterCurrState = I2C_OP_IDLE;

        data = (g_ui8MasterRxData[0] + (g_ui8MasterRxData[1]<<8));
        //
        // Print Message before sending data
        //
        //UARTprintf("Receiving %d bytes from external Slave...\n\n",g_ui8MasterRxData[NUM_OF_I2CBYTES - 1]);

       // UARTprintf("Received--3: '%x'\n",g_ui8MasterRxData[g_ui8MasterBytes]);
        SysCtlDelay(12000);
        




    }
}


void initI2C(uint32_t ui32SysClock)
{
    //
       // Enable GPIO for Configuring the I2C Interface Pins
       //
       SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOL);

       //
       // Wait for the Peripheral to be ready for programming
       //
       while(!SysCtlPeripheralReady(SYSCTL_PERIPH_GPIOL));

       //
       // Configure Pins for I2C2 Master Interface
       //
       GPIOPinConfigure(GPIO_PL1_I2C2SCL);
       GPIOPinConfigure(GPIO_PL0_I2C2SDA);
       GPIOPinTypeI2C(GPIO_PORTL_BASE, GPIO_PIN_0);
       GPIOPinTypeI2CSCL(GPIO_PORTL_BASE, GPIO_PIN_1);

       //
       // Configure GPIO Pin PL4 for Interrupt Time Processing
       //
       GPIOPinTypeGPIOOutput(GPIO_PORTL_BASE, GPIO_PIN_4);
       GPIOPinWrite(GPIO_PORTL_BASE, GPIO_PIN_4, 0x0);


       //
       // Stop the Clock, Reset and Enable I2C Module
       // in Master Function
       //
       SysCtlPeripheralDisable(SYSCTL_PERIPH_I2C2);
       SysCtlPeripheralReset(SYSCTL_PERIPH_I2C2);
       SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C2);

       //
       // Wait for the Peripheral to be ready for programming
       //
       while(!SysCtlPeripheralReady(SYSCTL_PERIPH_I2C2));

       //
       // Initialize and Configure the Master Module
       //
       I2CMasterInitExpClk(I2C2_BASE, ui32SysClock, false);  // false = 100khz , true = 400khz

       //
       // Enable Interrupts for Arbitration Lost, Stop, NAK, Clock Low
       // Timeout and Data.
       //
       I2CMasterIntEnableEx(I2C2_BASE, (I2C_MASTER_INT_STOP | I2C_MASTER_INT_NACK | I2C_MASTER_INT_DATA));

       //
       // Enable the Interrupt in the NVIC from I2C Master
       //
       IntEnable(INT_I2C2);

       //
       // Enable the Glitch Filter. Writting a value 0 will
       // disable the glitch filter
       // I2C_MASTER_GLITCH_FILTER_DISABLED
       // I2C_MASTER_GLITCH_FILTER_1
       // I2C_MASTER_GLITCH_FILTER_2 : Ideal Value when in HS Mode
       //                              for 120MHz clock
       // I2C_MASTER_GLITCH_FILTER_4
       // I2C_MASTER_GLITCH_FILTER_8 : Ideal Value when in Std,
       //                              Fast, Fast+ for 120MHz clock
       // I2C_MASTER_GLITCH_FILTER_16
       // I2C_MASTER_GLITCH_FILTER_32
       //
       I2CMasterGlitchFilterConfigSet(I2C2_BASE, I2C_MASTER_GLITCH_FILTER_8);
}