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#1) Include the following.
 
#include <sim.h>
#include <pins.h>
#include <i2cmaster.h>
#define YOUR_CHIP_ADDRESS		(0x48)			// Manufacturer Address 


#2) First figure out what peripheral pins you are using for I2C. 
For me i am using I2c Channel 0. Maybe different for the MOD54415

	// Set up pins for I2C channel 0
	Pins[27].function(PIN_27_I2C0_SCL);
	Pins[29].function(PIN_29_I2C0_SDA);

#2) Initialize the I2C

	// Init the I2C
	// NOTE: the default is for I2C0 if you need it on another port,
	// Your going to have to dig into the code and change it.
        // The parameter is the speed
	I2CInit(0x3f);


Then you can write or read. 


// Here is a write 8bit example. 

	BYTE i2cStatus;

	i2cStatus =   I2CStart( YOUR_CHIP_ADDRESS , I2C_START_WRITE );
	i2cStatus += I2CSend( data );
	i2cStatus += I2CStop();


// Now a write 16bits Example. 

	BYTE i2cStatus;

	i2cStatus = I2CStart( YOUR_CHIP_ADDRESS , I2C_START_WRITE );
	i2cStatus += I2CSend( register_loc );
	i2cStatus += I2CSend( data );
	i2cStatus += I2CStop();


// Now read 16bits back Example. 

	BYTE i2cStatus;
	BYTE data[2];


	i2cStatus =I2CStart( YOUR_CHIP_ADDRESS , I2C_START_WRITE );
	i2cStatus +=I2CSend( 0x00 );
   	i2cStatus +=I2CRestart( YOUR_CHIP_ADDRESS, I2C_START_READ );
	// true also adds the stop bit
	// Some chips need it and some do not, for you to check.
	i2cStatus +=I2CReadBuf(YOUR_CHIP_ADDRESS, data, 2,true);		


        //Now your results will be in data. 
        // if you want to make it into a WORD then do this
	// again the device may spit out LSB or MSB first so you need to check that. 

       WORD result;

       result = (WORD)data[0] << 8;
       result += (WORD)data[1];