3.5.35 Device ID register
This device ID register is a read-only register and contains the part ID for each
LPC111x/LPC11C1x part. This register is also read by the ISP/IAP commands

//================================================================================
====

void Init_I2C (){
    LPC_SYSCON->SYSAHBCLKCTRL |= (1<<5);            //Enables clock for I2C
    LPC_SYSCON->PRESETCTRL |= (1<<1);                //de-asserts I2C reset

    LPC_IOCON->PIO0_4 = 1;                            //Selects I2C function SCL (open-drain pin)
    LPC_IOCON->PIO0_5 = 1;                            //Selects I2C function SDA (open-drain pin)

    LPC_I2C->SCLH = 64000;
    LPC_I2C->SCLL = 64000;

    LPC_I2C->CONCLR = ((1<<2) | (1<<3) | (1<<5) | (1<<6));        //CON clear;
    NVIC_EnableIRQ(I2C_IRQn);                                    //I2C IRQ enable
    LPC_I2C->CONSET |= (1<<6);                                    //I2C enable

    test_i2c = LPC_I2C->STAT;

    I2C_State = CLEAR_BUS;
}

//================================================================================
====

void I2C_IRQHandler (){
    uint8_t StatValue = LPC_I2C->STAT;
    test_i2c = StatValue;
    switch(StatValue){
        case 0x08:                                        //START condition has been transmitted
            LPC_I2C->DAT = 0xA0;                        //Load SLA+W
            LPC_I2C->CONCLR |= ((1<<3) | (1<<5));        //Clear SIC, STA
            break;
        case 0x10:                                        //Repeated START condition has been transmitted
            LPC_I2C->DAT = 0xA0;                        //Load SLA+W
            LPC_I2C->CONCLR |= ((1<<3) | (1<<5));        //Clear STA
            break;
        case 0x18:                                        //SLA+W has been transmitted; ACK has been received
            LPC_I2C->DAT = 0xFF;
            LPC_I2C->CONSET |= (1<<4);
            break;
        case 0x20:                                        //SLA+W has been transmitted; NOT ACK has been received
            LPC_I2C->DAT = 0xFF;
            LPC_I2C->CONSET |= (1<<4);
            break;
        case 0x28:                                        //Data byte in DAT has been transmitted; ACK has been received
            break;
        case 0x30:                                        //Data byte in DAT has been transmitted; NOT ACK has been received
            break;
        case 0x38:                                        //Arbitration lost in SLA+R/W or Data bytes
            break;
        default:
            I2C_State = CLEAR_BUS;
            LPC_I2C->CONCLR |= (1<<3);
    }
    SW_1_TOG;
}

__inline short char2short (char *in)
{
return in[0] + (in[1] << 8);
}