usci_b_i2c_ex2_slaveRxMultiple.c

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#include "driverlib.h"
//*****************************************************************************
//
//*****************************************************************************
//*****************************************************************************
//
//Set the address for slave module. This is a 7-bit address sent in the
//following format:
//[A6:A5:A4:A3:A2:A1:A0:RS]
//
//A zero in the "RS" position of the first byte means that the master
//transmits (sends) data to the selected slave, and a one in this position
//means that the master receives data from the slave.
//
//*****************************************************************************
#define SLAVE_ADDRESS 0x48
 
 
uint8_t store[40] = { 9, 10, 11, 12, 13, 14, 15, 16, 17, 18};
uint8_t * receivedDataPointer;
 
void main ()
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
 
    //Assign I2C pins to USCI_B0
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_P3,
        GPIO_PIN1 + GPIO_PIN2
        );
 
    //Initialize I2C as a slave device
    USCI_B_I2C_initSlave(USCI_B0_BASE,
        SLAVE_ADDRESS
        );
 
    receivedDataPointer = store;
 
    //Specify transmit mode
    USCI_B_I2C_setMode(USCI_B0_BASE,
        USCI_B_I2C_RECEIVE_MODE
        );
 
    //Enable I2C Module to start operations
    USCI_B_I2C_enable(USCI_B0_BASE);
 
    //Enable interrupts
    USCI_B_I2C_clearInterrupt(USCI_B0_BASE,
        USCI_B_I2C_RECEIVE_INTERRUPT +
        USCI_B_I2C_STOP_INTERRUPT
        );
    USCI_B_I2C_enableInterrupt(USCI_B0_BASE,
        USCI_B_I2C_RECEIVE_INTERRUPT +
        USCI_B_I2C_STOP_INTERRUPT
        );
 
    while (1)
    {
        //Enter low power mode 0 with interrupts enabled.
        __bis_SR_register(LPM0_bits + GIE);
        __no_operation();
        receivedDataPointer = store;
    }
}
 
//******************************************************************************
//
//This is the USCI_B0 interrupt vector service routine.
//
//******************************************************************************
#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 USCI_B0_ISR (void)
{
    switch (__even_in_range(UCB0IV,12)){
        case USCI_I2C_UCRXIFG:
            //receive data
            *receivedDataPointer++ = USCI_B_I2C_slaveGetData(
            USCI_B0_BASE);
            break;
 
        case USCI_I2C_UCSTPIFG:
            __bic_SR_register_on_exit(LPM0_bits);
            break;
    }
}