MSPM0G3507: I2C NACK Controller Hangs

Baskar R

Part Number: MSPM0G3507

Tool/software:

Once put the data in the "DL_I2C_startControllerTransfer" process and I2C got NACK set due to slave has not responded. So, the I2C controller getting hanged further not able to re-transmit the data.

while (DL_I2C_getControllerStatus(I2C_0_INST) &
    DL_I2C_CONTROLLER_STATUS_ERROR) {
   
}

Once Error occurred these ERR,ADRACK,ARBLST and IDLE flags all are set.

How to clear those errors flags and continue I2C master data re-transmission again.

8 months ago

0 Bruce McKenney 8 months ago

Guru 100835 points

DL_I2C_startControllerTransfer() sets STOP, so the I2C unit has issued a Stop and the transaction is over. You can go ahead and start it again.

I recommend:

1) Wait until IDLE is set since that doesn't happen immediately [observed behavior]

2) Empty the TX and/or RX FIFOs (as appropriate) before restarting, since that doesn't happen automatically.

+1 Sal Ye 8 months ago

TI__Mastermind 26715 points

Hi Baskar,

If you call the "DL_I2C_startControllerTransfer", it will automatically generate the STOP signal.

And normally we do not poll the error status to track, see what the sdk example do:

    /* Poll until the Controller writes all bytes */
    while (DL_I2C_getControllerStatus(I2C_INST) &
           DL_I2C_CONTROLLER_STATUS_BUSY_BUS)
        ;

    /* 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))
        ;

You can find the example below:

i2c_controller_rw_multibyte_fifo_poll.c

B.R.

Sal

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MSPM0G3507: I2C NACK Controller Hangs