MSP432E411Y: I2CMSP432E4 driver does not recover after communication failure

Dear experts,

I was using a patched version of the I2CMSP432E4 driver for a while, see related post .

Now I thought it is on the time to upgrade to SimpleLink 4.10. But I have trouble with the new driver and need help.

We have a HDC1080 connected to the MSP432E411Y via a connector. This connection might get disconnected and connected again. The I2C communication should recover after reconnection and it did with the patched driver. With the new driver I get a strange behavior:

1. Start uC with Sensor connected -> transmission status 0 -> OK
2. disconnect sensor -> transmission status -1
3. reconnect  sensor -> transmission status -8

I can repeat steps 2 and 3 multiple times and status is reproducible, but not OK.

Then I set a break point in line 963 of I2CMSP432E4 .c. (I copied I2C.c and I2CMSP432E4 .c into my project to get debugging information.)

I step trough the code while the sensor is connected (key F6). The return value and transmission status become 0 -> OK.

I let the program run again. Now it works fine:

1. disconnect sensor -> transmission status -5
2. reconnect  sensor -> transmission status 0

I can repeat steps 1 and 2 multiple times and status is reproducible and OK.

I use the following code to open the dirver:

    I2C_Params i2cParams;
    I2C_Params_init(&i2cParams);
    i2cParams.transferMode = I2C_MODE_BLOCKING;
    i2cParams.bitRate = I2C_100kHz;

    /* check I2C for being open already -
     * I2C already might got opened by another HAL module, e.g.
     * BOARD_LHC04_I2C8 by expansion board or MAC address storage driver
     */
    I2C_SENSOR_ASSERT(i2cIdx < I2C_count);
    I2CMSP432E4_Object *i2cObjPtr = I2C_config[i2cIdx].object;
    if (i2cObjPtr->isOpen)
    {
        objPtr->i2cHandle = (I2C_Handle)&(I2C_config[i2cIdx]);
        /* check for right settings */
        I2C_SENSOR_ASSERT(i2cObjPtr->transferMode == i2cParams.transferMode);
        I2C_SENSOR_ASSERT(i2cObjPtr->bitRate == i2cParams.bitRate);
    }
    else
    {
        // I2C_open clears AMSEL bit via GPIOPadConfigSet(), thus no more ADC input
        objPtr->i2cHandle = I2C_open(i2cIdx, &i2cParams);
    }
    I2C_SENSOR_ASSERT(objPtr->i2cHandle != NULL);

The code to transmit data:

static bool HDC1080config(I2C_SensorObject *self)
{
    /* configure HDC1080 for combined temperature and humidity measurement, 14bit resolution each */
    uint8_t writeBuffer[] =
    {
        HDC_CONFIG, // write to HDC1080 configuration register (setting of pointer register)
        0x10, 0x00  // MSB first, bit 12 = 1 only: combined temperature and humidity measurement, high precision
    };
//    I2C_Transaction i2cTransaction;
//    i2cTransaction.slaveAddress = I2C_ADR_HDC1080;
//    i2cTransaction.writeBuf = writeBuffer;
//    i2cTransaction.writeCount = sizeof(writeBuffer);
//    i2cTransaction.readBuf = NULL;
//    i2cTransaction.readCount = 0;
//    return (I2C_transfer(self->i2cHandle, &i2cTransaction));
    self->i2cTransaction.slaveAddress = I2C_ADR_HDC1080;
    self->i2cTransaction.writeBuf = writeBuffer;
    self->i2cTransaction.writeCount = sizeof(writeBuffer);
    self->i2cTransaction.readBuf = NULL;
    self->i2cTransaction.readCount = 0;
    self->i2cTransaction.status = I2C_STATUS_SUCCESS;
    return (I2C_transfer(self->i2cHandle, &(self->i2cTransaction)));
}

Could you try to reproduce the issue and solve it?