usci_b_i2c_ex1_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 transmitData;
 
void main (void)
{
    //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
        );
    //Enable I2C Module to start operations
    USCI_B_I2C_enable(USCI_B0_BASE);
 
    //Set in transmit mode
    USCI_B_I2C_setMode(USCI_B0_BASE,
        USCI_B_I2C_TRANSMIT_MODE
        );
    //Initialize transmit data buffer
    transmitData = 0xAB;
 
    while(1)
    {
 
      // Poll for start
      while(0x00 == USCI_B_I2C_getInterruptStatus(USCI_B0_BASE, USCI_B_I2C_START_INTERRUPT));
 
      // Poll for transmit flag
      while(0x00 == USCI_B_I2C_getInterruptStatus(USCI_B0_BASE, USCI_B_I2C_TRANSMIT_INTERRUPT));
 
       //Transmit data
      USCI_B_I2C_slavePutData(USCI_B0_BASE,
      transmitData
      );
      // Increment TXData
      transmitData++;
 
      // Poll will STOP is received
       while(0x00 == USCI_B_I2C_getInterruptStatus(USCI_B0_BASE, USCI_B_I2C_STOP_INTERRUPT));
    }
}