File content as of revision 0:375ecd0ed73d:

#include "I2CR.h"

//Constructor
I2CR::I2CR() {

    //set pins to i2c1
    LPC_PINCON->PINSEL0 = LPC_PINCON->PINSEL0 | 0xF;
    //set to no pull up/down resistors
    LPC_PINCON->PINMODE0 = LPC_PINCON->PINMODE0 | 0xA;
    //set to open drain mode
    LPC_PINCON->PINMODE_OD0 = LPC_PINCON->PINMODE_OD0 | 0x3;

    //turn on power
    LPC_SC->PCONP = LPC_SC->PCONP | 0x00080000;

    //set clock to 100kHz
    LPC_I2C1->I2SCLL = 120;
    LPC_I2C1->I2SCLH = 120;

    //enable i2c1 i2en
    LPC_I2C1->I2CONSET = 0x40;
    //clear sta si and aa
    LPC_I2C1->I2CONCLR = 0x2C;


}

//Write function
int I2CR::write(int address, const char* data, int length) {
    //MASTER TRANSMITTER

    //send start condition
    LPC_I2C1->I2CONSET = 0x20;

    //block until interrupt
    while ((LPC_I2C1->I2CONSET & 0x8) != 0x8) {}

    //i2stat should be 0x08. could check
    if (LPC_I2C1->I2STAT != 0x08) {
        printf("START %x\r\n",LPC_I2C1->I2STAT);
        //stop if failed
        LPC_I2C1->I2CONSET = 0x10;
        return -1;
    }

    //clear start condition
    LPC_I2C1->I2CONCLR = 0x20;

    //load i2dat
    LPC_I2C1->I2DAT = address;

    //reset si
    LPC_I2C1->I2CONCLR = 0x08;

    //block until interrupt
    while ((LPC_I2C1->I2CONSET & 0x8) != 0x8) {}

    //i2stat should be ack received
    if (LPC_I2C1->I2STAT != 0x18) {
        printf("ADD %x\r\n",LPC_I2C1->I2STAT);
        //stop
        LPC_I2C1->I2CONSET = 0x10;
        return -1;
    }

    for (int i=0; i<length; i++) {
    
        //load i2dat
        LPC_I2C1->I2DAT = data[i];

        //reset si
        LPC_I2C1->I2CONCLR = 0x08;

        //block until interrupt
        while ((LPC_I2C1->I2CONSET & 0x8) != 0x8) {}

        //i2stat should be ack received
        if (LPC_I2C1->I2STAT != 0x28) {
            printf("DATA%d %x\r\n",i,LPC_I2C1->I2STAT);
            //stop
            LPC_I2C1->I2CONSET = 0x10;
            return -1;
        }
    }

    //stop
    LPC_I2C1->I2CONSET = 0x10;

    //reset si
    LPC_I2C1->I2CONCLR = 0x08;

    return 0;
}


int I2CR::read(int address, char* data, int length) {

    //MASTER RECEIVER

    //send start condition
    LPC_I2C1->I2CONSET = 0x20;

    //block until interrupt
    while ((LPC_I2C1->I2CONSET & 0x8) != 0x8) {}

    //i2stat should be 0x08. could check
    if (LPC_I2C1->I2STAT != 0x08) {
        printf("RSTART %x\r\n",LPC_I2C1->I2STAT);
        //stop if failed
        LPC_I2C1->I2CONSET = 0x10;
        return -1;
    }

    //clear start condition
    LPC_I2C1->I2CONCLR = 0x20;

    //load i2dat with read bit set
    LPC_I2C1->I2DAT = address | 0x1;

    //reset si
    LPC_I2C1->I2CONCLR = 0x08;

    //block until interrupt
    while ((LPC_I2C1->I2CONSET & 0x8) != 0x8) {}

    //i2stat should be 0x40 - ack received
    if (LPC_I2C1->I2STAT != 0x40) {
        printf("RADD %x\r\n",LPC_I2C1->I2STAT);
        //stop
        LPC_I2C1->I2CONSET = 0x10;
        return -1;
    }

    for (int i=0; i<length-1; i++) {

        //ack next byte
        LPC_I2C1->I2CONSET = 0x4;

        //reset si
        LPC_I2C1->I2CONCLR = 0x08;

        //block until interrupt
        while ((LPC_I2C1->I2CONSET & 0x8) != 0x8) {}

        //i2stat should be 0x50, byte received, ack sent
        if (LPC_I2C1->I2STAT != 0x50) {
            printf("rDATA%d %x\r\n",i,LPC_I2C1->I2STAT);
            //stop
            LPC_I2C1->I2CONSET = 0x10;
            return -1;
        }

        data[i] = LPC_I2C1->I2DAT;
    }

    //last byte
    //nack next byte
    LPC_I2C1->I2CONCLR = 0x4;

    //reset si
    LPC_I2C1->I2CONCLR = 0x08;

    //block until interrupt
    while ((LPC_I2C1->I2CONSET & 0x8) != 0x8) {}

    //i2stat should be 0x58, byte received, nack sent
    if (LPC_I2C1->I2STAT != 0x58) {
        printf("lastd %x\r\n",LPC_I2C1->I2STAT);
        //stop
        LPC_I2C1->I2CONSET = 0x10;
        return -1;
    }

    data[length-1] = LPC_I2C1->I2DAT;

    //stop
    LPC_I2C1->I2CONSET = 0x10;

    //reset si
    LPC_I2C1->I2CONCLR = 0x08;

    return 0;

}