#include <driverlib.h>
#include <msp430.h>
#include <stdio.h>

    const uint16_t interrupts = EUSCI_B_I2C_RECEIVE_INTERRUPT0;
    volatile uint32_t i;
    volatile uint8_t Rxbuf[5];
    volatile uint8_t status;

int main(void){

    WDT_A_hold(WDT_A_BASE);                                                    // Stop watchdog timer

    GPIO_setAsOutputPin(GPIO_PORT_P1, GPIO_PIN0 + GPIO_PIN1);                  // Set P1.0 + 1.1 to output direction - LED1 + LED2
    GPIO_setAsOutputPin(GPIO_PORT_P1, GPIO_PIN6);                              // Set P1.6 to output - Standby1
    GPIO_setAsOutputPin(GPIO_PORT_P2, GPIO_PIN7);                              // Set P2.7 to output - Reset1
    GPIO_setAsOutputPin(GPIO_PORT_P2, GPIO_PIN6);                              // Set P2.6 to output - Standby2
    GPIO_setAsOutputPin(GPIO_PORT_P2, GPIO_PIN5);                              // Set P2.5 to output - Reset2
    GPIO_setOutputLowOnPin(GPIO_PORT_P1, GPIO_PIN0 + GPIO_PIN1);               // Set LEDs to low
    GPIO_setAsInputPinWithPullUpResistor(GPIO_PORT_P2, GPIO_PIN1);             // Set P2.1 to input  - Button
    // Set P1.2 to input  - i2c_SDA & P1.3 to input  - i2c_SCL
    GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1, GPIO_PIN2 + GPIO_PIN3, GPIO_PRIMARY_MODULE_FUNCTION);

    // Disable the GPIO power-on default high-impedance mode to activate previously configured port settings
    PMM_unlockLPM5();

    EUSCI_B_I2C_initSlaveParam initSlaveParam = {0};
    initSlaveParam.slaveAddress = 0x48;
    initSlaveParam.slaveAddressOffset = EUSCI_B_I2C_OWN_ADDRESS_OFFSET0;
    initSlaveParam.slaveOwnAddressEnable = EUSCI_B_I2C_OWN_ADDRESS_ENABLE;
    EUSCI_B_I2C_initSlave(EUSCI_B0_BASE, &initSlaveParam);

    EUSCI_B_I2C_setMode(EUSCI_B0_BASE, EUSCI_B_I2C_RECEIVE_MODE);

    EUSCI_B_I2C_enable(EUSCI_B0_BASE);

    EUSCI_B_I2C_clearInterrupt(EUSCI_B0_BASE, interrupts);

    EUSCI_B_I2C_enableInterrupt(EUSCI_B0_BASE, interrupts);                    // receive interrupt enable

    GPIO_setOutputLowOnPin(GPIO_PORT_P1, GPIO_PIN6);
    __delay_cycles(1000);
    GPIO_setOutputHighOnPin(GPIO_PORT_P1, GPIO_PIN6);                          // Standby board 1

    __delay_cycles(5000000);

    GPIO_setOutputLowOnPin(GPIO_PORT_P2, GPIO_PIN7);                           // Reset board 1
    GPIO_setOutputHighOnPin(GPIO_PORT_P2, GPIO_PIN7);

    __bis_SR_register(CPUOFF + GIE);
    __no_operation();

}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_B0_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(USCI_B0_VECTOR)))
#endif
void USCIB0_ISR(void)
{
    switch(__even_in_range(UCB0IV, USCI_I2C_UCBIT9IFG))
    {
        case USCI_NONE:             // No interrupts break;
            break;
        case USCI_I2C_UCALIFG:      // Arbitration lost
            break;
        case USCI_I2C_UCNACKIFG:    // NAK received (master only)
            break;
        case USCI_I2C_UCSTTIFG:     // START condition detected with own address (slave mode only)
            break;
        case USCI_I2C_UCSTPIFG:     // STOP condition detected (master & slave mode)
            break;
        case USCI_I2C_UCRXIFG3:     // RXIFG3
            break;
        case USCI_I2C_UCTXIFG3:     // TXIFG3
            break;
        case USCI_I2C_UCRXIFG2:     // RXIFG2
            break;
        case USCI_I2C_UCTXIFG2:     // TXIFG2
            break;
        case USCI_I2C_UCRXIFG1:     // RXIFG1
            break;
        case USCI_I2C_UCTXIFG1:     // TXIFG1
            break;
        case USCI_I2C_UCRXIFG0:     // RXIFG0
            Rxbuf[0] = UCB0RXBUF; //EUSCI_B_I2C_slaveGetData(EUSCI_B0_BASE);
            if(Rxbuf[0]){
                GPIO_setOutputHighOnPin(GPIO_PORT_P1, GPIO_PIN1);
            }
            break;
        case USCI_I2C_UCTXIFG0:     // TXIFG0
            break;
        case USCI_I2C_UCBCNTIFG:    // Byte count limit reached (UCBxTBCNT)
            break;
        case USCI_I2C_UCCLTOIFG:    // Clock low timeout - clock held low too long
            break;
        case USCI_I2C_UCBIT9IFG:    // Generated on 9th bit of a transmit (for debugging)
            break;
        default:
            break;
    }
}