eusci_b_i2c_ex2_slaveTxSingle.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 TXData = 0x00;
 
void main(void)
{
    WDT_A_hold(WDT_A_BASE);
 
    // Configure Pins for I2C
    //Set P1.6 and P1.7 as Secondary Module Function Input.
    /*
 
    * Select Port 1
    * Set Pin 6, 7 to input Secondary Module Function, (UCB0SIMO/UCB0SDA, UCB0SOMI/UCB0SCL).
    */
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_P1,
        GPIO_PIN6 + GPIO_PIN7,
        GPIO_SECONDARY_MODULE_FUNCTION
    );
 
    // eUSCI configuration
    EUSCI_B_I2C_initSlaveParam param = {0};
    param.slaveAddress = SLAVE_ADDRESS;
    param.slaveAddressOffset = EUSCI_B_I2C_OWN_ADDRESS_OFFSET0;
    param.slaveOwnAddressEnable = EUSCI_B_I2C_OWN_ADDRESS_ENABLE;
    EUSCI_B_I2C_initSlave(EUSCI_B0_BASE, &param);
 
    //Enable I2C Module to start operations
    EUSCI_B_I2C_enable(EUSCI_B0_BASE);
 
    EUSCI_B_I2C_clearInterrupt(EUSCI_B0_BASE,
                EUSCI_B_I2C_TRANSMIT_INTERRUPT0 +
                EUSCI_B_I2C_STOP_INTERRUPT
                );
 
    EUSCI_B_I2C_enableInterrupt(EUSCI_B0_BASE,
                EUSCI_B_I2C_TRANSMIT_INTERRUPT0 +
                EUSCI_B_I2C_STOP_INTERRUPT
              );
 
    __bis_SR_register(CPUOFF + GIE);        // Enter LPM0 w/ interrupts
    __no_operation();
}
 
//******************************************************************************
//
//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 USCIB0_ISR(void)
 
{
switch(__even_in_range(UCB0IV,0x1E))
    {
        case 0x00: break; // Vector 0: No interrupts break;
        case 0x02: break; // Vector 2: ALIFG
        case 0x04: break; // Vector 4: NACKIFG
        case 0x06: break; // Vector 6: STTIFG
        case 0x08:       // Vector 8: STPIFG
          TXData++;
        break;
        case 0x0a: break; // Vector 10: RXIFG3 break;
        case 0x0c: break; // Vector 14: TXIFG3 break;
        case 0x0e: break; // Vector 16: RXIFG2 break;
        case 0x10: break; // Vector 18: TXIFG2 break;
        case 0x12: break; // Vector 20: RXIFG1 break;
        case 0x14: break; // Vector 22: TXIFG1 break;
        case 0x16: break; // Vector 24: RXIFG0 break;
        case 0x18:
             EUSCI_B_I2C_slavePutData(EUSCI_B0_BASE,
                TXData
                );
           break; // Vector 26: TXIFG0 break;
        case 0x1a: break; // Vector 28: BCNTIFG break;
        case 0x1c: break; // Vector 30: clock low timeout break;
        case 0x1e: break; // Vector 32: 9th bit break;
        default: break;
 
    }
}