void initChip(){
CLKDIVbits.RCDIV = 0;
AD1PCFG = 0x9FFE;
I2C2CON = 0;
TRISBbits.TRISB3 = 0;
TRISBbits.TRISB2 = 0;
I2C2BRG = 157;
I2C2CONbits.I2CEN = 1;
_MI2C2IF = 0;
}

void chipWrite(char reg, char data){
//Start bit
I2C2CONbits.SEN = 1;
while(I2C2CONbits.SEN);
IFS3bits.MI2C2IF = 0;

//Slave address bit
I2C2TRN = 0b01010000;
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF = 0;

//Register address
I2C2TRN = reg;
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF = 0;

//Data
I2C2TRN = data;
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF = 0;

//Stop bit
I2C2CONbits.PEN = 1;
IFS3bits.MI2C2IF = 0;
while(I2C2CONbits.PEN);
}

unsigned char chipRead(char reg){
unsigned char msb = 0;

/*configure i2c to send ACK*/
I2C2CONbits.ACKDT = 0;

  /*start*/
I2C2CONbits.SEN = 1;
while(I2C2CONbits.SEN);

/*sensor address*/
I2C2TRN = 0b01010000;
while(I2C2STATbits.TBF);
while(I2C2STATbits.TRSTAT);
while(I2C2STATbits.ACKSTAT);

 /*sensor command*/
I2C2TRN = 0b11111101;
while(I2C2STATbits.TBF);
while(I2C2STATbits.TRSTAT);
while(I2C2STATbits.ACKSTAT);

 /*repeated start*/
I2C2CONbits.RSEN = 1;
while(I2C2CONbits.RSEN);

/*address for reading*/
I2C2TRN = reg;
while(I2C2STATbits.TBF);
while(I2C2STATbits.TRSTAT);
while(I2C2STATbits.ACKSTAT);

 /*receiver enabled*/
I2C2CONbits.RCEN = 1;

/*read first byte data*/
while(!I2C2STATbits.RBF);
msb = I2C2RCV;

/*configure i2c to send nack*/
I2C2CONbits.ACKDT = 1;
/*send nack*/
I2C2CONbits.ACKEN = 1;
while(I2C1CONbits.ACKEN);

/*send stop*/
I2C2CONbits.PEN = 1;
while(I2C2CONbits.PEN);
I2C2CONbits.I2CEN = 0;

return msb;
}

int main(void) {
initChip();
char key = 0b00000000;
chipWrite(0x72,0x00);
chipWrite(0x74, 0xFF);

while(1){
    key = chipRead(0xFD);
    asm("nop");
    if(key == 0b01010000){
        asm("nop");
    }
}

return 0;
}