static void i2c_slave_callback(I2C_Type *base, volatile i2c_slave_transfer_t *xfer, void *userData)
{
    callback_message_t *cb_msg = (callback_message_t *)userData;
    BaseType_t reschedule      = 0;

    switch (xfer->event)
    {
        /*  Transmit request */
        case kI2C_SlaveTransmitEvent:
            /*  Update information for transmit process */
            xfer->txData = g_slave_return_buff;
            xfer->txSize = I2C_DATA_LENGTH;
            break;

        /*  Receive request */
        case kI2C_SlaveReceiveEvent:
            /*  Update information for received process */
            xfer->rxData = g_slave_buff;
            xfer->rxSize = I2C_DATA_LENGTH;
            break;

        /*  Transfer done */
        case kI2C_SlaveCompletionEvent:
            cb_msg->async_status = xfer->completionStatus;
            xSemaphoreGiveFromISR(cb_msg->sem, &reschedule);
            portYIELD_FROM_ISR(reschedule);
            break;
        default:
            break;
    }
}