MSP430FR5994: I2C Master Communication Issue

Two things:

1) Use the "Insert: Code" feature of the editor for your code.

2) How doesn't it work? Fails to start? Slave doesn't respond? Data isn't read? Written?

2) How doesn't it work? Fails to start? Slave doesn't respond? Data isn't read? Written?

1) Use the "Insert: Code" feature of the editor for your code.
As per my understanding you are asking to include the driver code during project creation, if yes then we have done the same while creating the project

void EUSCI_B_I2C_INIT(uint16_t u16_i2cBase, uint32_t u32_dataRate)
{
    EUSCI_B_I2C_initMasterParam i2cParam = {0};

    // i2c parameters
    i2cParam.selectClockSource = EUSCI_B_I2C_CLOCKSOURCE_SMCLK;
    i2cParam.i2cClk = CS_getSMCLK();
    i2cParam.dataRate = u32_dataRate;
    i2cParam.byteCounterThreshold = 0;
    i2cParam.autoSTOPGeneration = EUSCI_B_I2C_NO_AUTO_STOP;

    // Initializing Master
    EUSCI_B_I2C_initMaster(u16_i2cBase, &i2cParam);

    // Enable I2C module
    EUSCI_B_I2C_enable(u16_i2cBase);

    EUSCI_B_I2C_setMode(u16_i2cBase, EUSCI_B_I2C_TRANSMIT_MODE);

    return;
}


void i2cReadByte(uint16_t u16_i2cBase,
                uint8_t u8_slaveId, uint8_t u8_regAddr,
                uint8_t *pu8_data
                )
{
    // Set slave id in i2c bus
    EUSCI_B_I2C_setSlaveAddress(u16_i2cBase, u8_slaveId);

    // Switch to transmit mode
    EUSCI_B_I2C_setMode(u16_i2cBase, EUSCI_B_I2C_TRANSMIT_MODE);

    // Send register address first
    EUSCI_B_I2C_masterSendSingleByte(u16_i2cBase, u8_regAddr);
    while(EUSCI_B_I2C_isBusBusy(u16_i2cBase));

    // Receive data
    *pu8_data = EUSCI_B_I2C_masterReceiveSingleByte(u16_i2cBase);
    while(EUSCI_B_I2C_isBusBusy(u16_i2cBase));

    return;
}


void i2cReadBytes(uint16_t u16_i2cBase,
                  uint8_t u8_slaveId, uint8_t u8_regAddr,
                  uint8_t *pu8_data, uint16_t u16_length
                  )
{
    uint16_t u16_index = 0;

    // Set slave id in i2c bus
    EUSCI_B_I2C_setSlaveAddress(u16_i2cBase, u8_slaveId);

    // Switch to transmit mode
    EUSCI_B_I2C_setMode(u16_i2cBase, EUSCI_B_I2C_TRANSMIT_MODE);

    // Send register address first
    EUSCI_B_I2C_masterSendSingleByte(u16_i2cBase, u8_regAddr);
    while(EUSCI_B_I2C_isBusBusy(u16_i2cBase));

    // Master receive begin
    EUSCI_B_I2C_masterReceiveStart(u16_i2cBase);

    // Receive data
    for(u16_index = 0; u16_index < u16_length - 1; ++u16_index)
    {
        while(!EUSCI_B_I2C_getInterruptStatus(u16_i2cBase, EUSCI_B_I2C_RECEIVE_INTERRUPT0));
        pu8_data[u16_index] = EUSCI_B_I2C_masterReceiveMultiByteNext(u16_i2cBase);
    }

    // Receive last byte
    pu8_data[u16_index] = EUSCI_B_I2C_masterReceiveMultiByteFinish(u16_i2cBase);

    return;
}


void i2cWriteByte(uint16_t u16_i2cBase,
                uint8_t u8_slaveId, uint8_t u8_regAddr,
                uint8_t *pu8_data
                )
{
    // Set slave id in i2c bus
    EUSCI_B_I2C_setSlaveAddress(u16_i2cBase, u8_slaveId);

    // Switch to transmit mode
    EUSCI_B_I2C_setMode(u16_i2cBase, EUSCI_B_I2C_TRANSMIT_MODE);

    EUSCI_B_I2C_masterSendMultiByteStart(u16_i2cBase, u8_regAddr);

    while(!EUSCI_B_I2C_getInterruptStatus(u16_i2cBase, EUSCI_B_I2C_TRANSMIT_INTERRUPT0));

    // Send data
    EUSCI_B_I2C_masterSendMultiByteFinish(u16_i2cBase, pu8_data[0]);

    return;
}


void i2cWriteBytes(uint16_t u16_i2cBase,
                  uint8_t u8_slaveId, uint8_t u8_regAddr,
                  uint8_t *pu8_data, uint16_t u16_length
                  )
{
    uint8_t u8_index = 0;

    // Set slave id in i2c bus
    EUSCI_B_I2C_setSlaveAddress(u16_i2cBase, u8_slaveId);

    // Switch to transmit mode
    EUSCI_B_I2C_setMode(u16_i2cBase, EUSCI_B_I2C_TRANSMIT_MODE);

    // Send register address first
    EUSCI_B_I2C_masterSendMultiByteStart(u16_i2cBase, u8_regAddr);

    // Transmit data
    for(u8_index = 0; u8_index < (u16_length - 1); ++u8_index)
    {
        while (!EUSCI_B_I2C_getInterruptStatus(u16_i2cBase, EUSCI_B_I2C_TRANSMIT_INTERRUPT0));
        EUSCI_B_I2C_masterSendMultiByteNext(u16_i2cBase, pu8_data[u8_index]);
    }

    // Transmit last byte
    EUSCI_B_I2C_masterSendMultiByteFinish(u16_i2cBase, pu8_data[u8_index]);

    return;
}

So you don't know where it fails and haven't even tried stepping through the code with the debugger.

I2C initialization is successful (on successful initialization LED gets ON as per program)

.

All library function's return type is void, there is no success / fail indication

-> In write operation, the exact data is being written

-> In read operation, read data is different

The reason behind unable to decide where exactly it is getting wrong because of

-> The maintained sequence in read/write operation

(As per my understanding it looks correct)

-> Any other function which should be included but it's missed from our side

So I shared code, h/w side everything is fine

Connected devices are DS3231 (RTC) and counter

(Both the devices are working fine with TI-RTOS package without fail)

.

As per the latest observation,

- > Read operation is working fine, default values are coming without any problem

-> But the moment we are performing write operation, read values are becoming random