Simple I²C communication using driverlib

You can use this example for simple I²C communication

<source lang="c"> void I2Cinit(void) { // Enable periph for I²C SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C0); SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);

// Enable Port B of GPIO // SDA 0 Bit 3 Output // SCL 0 Bit 2 Output GPIOPinTypeI2C(GPIO_PORTB_BASE, GPIO_PIN_2 | GPIO_PIN_3);// Port B 2 y 3

// Initializes the I2C Master block with clock I2CMasterInitExpClk(I2C0_MASTER_BASE, SysCtlClockGet(), false); // true=400kbps / false=100kbps }

// Write one byte to slaveaddr // WARNING: SlaveAddr => whithout last write/read bit!!!! // return false if failed

tBoolean I2Cwrite(byte SlaveAddr, byte Data) { // Check I2C lines not busy while(I2CMasterBusy(I2C0_MASTER_BASE));

// Specify slave address I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SlaveAddr, false); // false = WRITE

// Place the character to be sent in the data register I2CMasterDataPut(I2C0_MASTER_BASE, Data);

// Initiate send of character from Master to Slave I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_SINGLE_SEND);

// Delay while busy while(I2CMasterBusy(I2C0_MASTER_BASE));

   // See if there was an error
   if(I2CMasterErr(I2C0_MASTER_BASE) == I2C_MASTER_ERR_NONE)
   {
       return false;
   }

else return true; }

byte I2Cread(byte SlaveAddr) { // Check I2C lines not busy while(I2CMasterBusy(I2C0_MASTER_BASE));

// Specify slave address I2CMasterSlaveAddrSet(I2C0_MASTER_BASE, SlaveAddr, true); // true = read

// Initiate read of character from Master to Slave I2CMasterControl(I2C0_MASTER_BASE, I2C_MASTER_CMD_SINGLE_RECEIVE);

// Delay while busy while(I2CMasterBusy(I2C0_MASTER_BASE));

   // See if there was an error
   if(I2CMasterErr(I2C0_MASTER_BASE) == I2C_MASTER_ERR_NONE)
   {
       return I2CMasterDataGet(I2C0_MASTER_BASE);
   }

else return 0x00; } </source>