TLIN1431-Q1: -

Hi Halappa,

I would recommend to add print statements or debugging outputs to help verify which states are being entered during execution I.e., tracing if the watchdog service case is reached. See below hints, thanks.

• Not ensuring that the watchdog timeout is correctly set per the timing of servicing aligning with your application's loop frequency.
• Not ensuring the SPI is set up correctly before sending commands I.e., clock polarity, phase, etc. are consistent.
• Not ensuring that the device goes through a proper initialization sequence after a power cycle, if any dependencies that may mot be initialized correctly after power on.
• If feasible, verify and test with a minimal version of your code that only initializes the watchdog and SPI so as to help isolate the issue

Per Your code:

• Watchdog service handling: Ensure this line is executed at a frequency that meets the watchdog timeout requirements, I.e., If this state is not reached often enough, the watchdog could cause an unintended reset.

case SBC_SERVICE_WATCHDOG:

    SBC_WRITE(REGS_MD_INPUT_TRIG, 0xFF);

    break;

• State transition management: Verify how SbcTl1431_State transitions into SBC_SERVICE_WATCHDOG. If there are logic issues preventing the transition, the watchdog may not be serviced in time.
• Closed window handling: This code seem to guarantee a transition to SBC_SERVICE_WATCHDOG every time SBC_CLOSED_WINDOW_IDLE is entered, since closedWindowStayIdle is always set to 0 here. Confirm whether this is intentional, or if closedWindowStayIdle should be conditionally assigned elsewhere.

case SBC_CLOSED_WINDOW_IDLE:

    closedWindowStayIdle = 0u;

    if (closedWindowStayIdle == 0) {

        SbcTl1431_State = SBC_SERVICE_WATCHDOG;

    }

Best Regards,

Michael.

Hi Halappa,

Yes, if you are using the window, the watchdog expects servicing within a valid window and triggering too early can count as a violation causing a reset.

I would recommend to wait after 25 ms before servicing the first time I.e., you may delay your first window to about 30 ms or later by adding a safety delay after MCU reset, thanks.

DelayMs(30); // waiting for watchdog window to open

    SBC_WRITE(REGS_MD_INPUT_TRIG, 0xFF); // services watchdog

Best Regards,

Michael.