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TMS570LS1227: Watchdog timer stops the MCU but does not restart

Nesli
Prodigy 115 points
Part Number: TMS570LS1227
Other Parts Discussed in Thread: HALCOGEN

Hello, 

I am trying to implement a simple watchdog timer in my code and I want my code to reset and restart from the beginning if I don't "pet" the watchdog, but it just stops working all together and doesn't restart. 

I am using FreeRTOS and configure all settings in Halcogen. As a consequence of the OS, there is no RTI settings page so I have to access its registers manually in my CCS code. 

I need to implement a watchdog timer, but not a windowed one. I am assuming "Digital Windowed Watchdog Reaction Control Register" (RTIWWDRXNCTRL) controls the reaction to non-windowed watchdog timer as well.

  • 0
    TI__Guru**** 198546 points

    Hello,

    We don't have an example of using DWD in freeRTOS. Did you make the DWD work without freeRTOS? 

    You can use the DWWD example in HALCoGen. When the window size is 100%, it acts as DWD time-out-only watchdog.

  • 0 in reply to QJ Wang
    Prodigy 115 points

    To be able to use that example, I need the rti.h file that would be generated by halcogen but enabling the rti driver isn't not an option because of the freeRTOS. So instead I access the registers directly in my code with these functions:

    void S0G1_WDT_Init(uint16 preload)
{
  /* T_exp = (PRELOAD + 1) x 2^13 / RTICLK1 */
  wdtREG->WWDRXNCTRL = 0x05; /* Reset after expiration */
  wdtREG->WDSTATUS = 0xFF;	/* Clear status register */
  wdtREG->DWDPRLD = preload; /* Set expiration time */
}

void S0G1_WDT_Start(void)
{
  wdtREG->DWDCTRL = 0xA98559DA;
}

void S0G1_WDT_Reset(void)
{
  wdtREG->WDKEY = 0x0000E51A;
  wdtREG->WDKEY = 0x0000A35C;
}

    I think the watchdog is really enabled (I can't debug the code - there is no jtag) since it stops my program if not petted, but doesn't restart it. Any suggestions?

  • 0 in reply to Nesli
    Prodigy 115 points

    An update:

    I want to try to generate an NMI when the watchdog timer reaches zero instead of generating a system reset. However I cannot find the interrupt number generated by watchdog neither in the user manual nor in halcogen. 

    Can you give some information about the NMI generated by the watchdog?

  • 0 in reply to Nesli
    TI__Guru**** 198546 points

    The interrupt from the Windowed Watchdog is mapped to ESM group 2 channel 24. You need to configure the windowed watchdog (DWWD) reaction to be an interrupt instead of a system reset on any watchdog violation. The ESM group2 flag will then generate a non-maskable interrupt to the CPU via the VIM interrupt channel 0 (mapped to ESM high-priority interrupt).