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MSPM0G1106: I2C STAND LOOP

burak benderlioglu
Prodigy 115 points

Part Number: MSPM0G1106

Tool/software:

In the code line below, I can read the DS1307 time chip without any problems, but in case of any hangup or sudden processor reset, while (DL_I2C_isControllerRXFIFOEmpty(I2C_INST)); It is waiting within the function, which stops my system. In this case, what software scenario would you recommend?

uint8_t readDS1307Register(uint8_t regAddr) {
    uint8_t data;


    DL_I2C_fillControllerTXFIFO(I2C_INST, &regAddr, 1);

       /* Wait for I2C to be Idle */
       while (!(
           DL_I2C_getControllerStatus(I2C_INST) & DL_I2C_CONTROLLER_STATUS_IDLE))
           ;

       /* Send the packet to the controller.
        * This function will send Start + Stop automatically.
        */
       DL_I2C_startControllerTransfer(I2C_INST, DS1307_ADDRESS,
           DL_I2C_CONTROLLER_DIRECTION_TX, 1);

       /* Trap if there was an error */
       if (DL_I2C_getControllerStatus(I2C_INST) &
           DL_I2C_CONTROLLER_STATUS_ERROR) {
           /* LED will remain high if there is an error */
           __BKPT(0);
       }

       /* Wait for I2C to be Idle */
       while (!(
           DL_I2C_getControllerStatus(I2C_INST) & DL_I2C_CONTROLLER_STATUS_IDLE))
           ;

       /* Add delay between transfers */
       delay_cycles(100);

       /* Send a read request to Target */
       DL_I2C_startControllerTransfer(I2C_INST, DS1307_ADDRESS,
           DL_I2C_CONTROLLER_DIRECTION_RX, 1);




    while (DL_I2C_isControllerRXFIFOEmpty(I2C_INST));
    data = DL_I2C_receiveControllerData(I2C_INST);


    if (DL_I2C_getControllerStatus(I2C_INST) & DL_I2C_CONTROLLER_STATUS_ERROR) {
        printf("I2C Okuma Hatasi!\n");
    }

    return bcdToDec(data);
}

  • 0
    TI__Genius 10705 points

    Hi,

    1. A system reset may interrupt the i2c write command transferring progress, which causes i2c target device could not respond to i2c controller. 

    2. To avoid program blocking in the  while (DL_I2C_isControllerRXFIFOEmpty(I2C_INST)); , a timeout parameter could be used in this problem. Here is a example for reference:

    int i2c_read(I2C_Regs *i2c, uint32_t targetAddr, uint8_t *buffer, uint16_t length, uint32_t timeOut)
{
    /* Wait for I2C to be Idle */
    while (!(
        DL_I2C_getControllerStatus(i2c) & DL_I2C_CONTROLLER_STATUS_IDLE))
        ;

    /* Send a read request to Target */
    DL_I2C_startControllerTransfer(i2c, targetAddr,
        DL_I2C_CONTROLLER_DIRECTION_RX, length);

    /*
     * Receive all bytes from target. LED will remain high if not all bytes
     * are received
     */
    for (uint8_t i = 0; i < length; i++) {
        uint32_t tmpCnt = timeOut;
        while (DL_I2C_isControllerRXFIFOEmpty(i2c)){
            tmpCnt --;
            /* Receiving time out */
            if (tmpCnt == 0)
                return -1;
        }
        buffer[i] = DL_I2C_receiveControllerData(i2c);
    }

    return 0;
}

    Regards,

    Pengfei