RM57L843: Digital watchdog using FreeRTOS

Ravi Teja Darbha

Part Number: RM57L843
Other Parts Discussed in Thread: HALCOGEN

Tool/software:

Hi,

I am trying to use Digital watchdog in the freertos build generated by halcogen and have following issues.

1. , I dont see any RTI module api's for initializing and petting the watchdog generated by halcogen. Just wanted to check if it is unavailable for freertos builds or am I missing something here?

2. I created my own watchdog api's since I couldn't find the halcogen generated ones. I am calling watchdogInit from main before starting the freertos scheduler but not petting the watchdog..Once I connect to the debugger and it boots up for the first time, the watchdog resets the system after the expected timeout (since we are not petting the watchdog), After this system reset due to watchdog timeout and system comes up again and it seems to enter data abort. Could anyone help me figure this out?

void watchdogInit(void)
{
// Load the preload value
portRTI_DWDPRLD_REG = 0xFFF;

// Enable Digital Watchdgo
portRTI_DWDCTRL_REG = DWDCTRL_INIT_VALUE;
}

void watchdogPet(void)
{
portRTI_DWDKEY_REG = DWD_KEY1;
portRTI_DWDKEY_REG = DWD_KEY1;
}

Thanks,

Ravi

9 months ago

0 Ravi Teja Darbha 9 months ago

Intellectual 305 points

Can I get a response on this?

Thanks,

Ravi

0 jagadish gundavarapu 9 months ago in reply to Ravi Teja Darbha

TI__Guru 70391 points

Hi Ravi,

First i am suggesting you verify below two threads that i handled related to watchdog with FreeRTOS:

(+) TMS570LS3137: Watchdog errors TMS570LS3137 - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

(+) TMS570LS3137: how to migrate freertos - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

--
Thanks & regards,
Jagadish.

0 Ravi Teja Darbha 9 months ago in reply to jagadish gundavarapu

Intellectual 305 points

I checked the links you shared. However, in both of these links, they seem to use halcogen generated watchdog api's such as dwdReset etc. However, I don't see any such API's generated in my freertos project for RM57. Upon chekcing Halcogen settings, the RTI checkbox under Driver Enable" table is grayed out. So, I can't enable it. Could you advice me further on this?

Thanks,

Ravi

0 Ravi Teja Darbha 9 months ago in reply to Ravi Teja Darbha

Intellectual 305 points

Hi,

Can I get a response on this?

Could anyone tell me why RTI module has been grayed out in Halcogen?

Ravi

0 jagadish gundavarapu 9 months ago in reply to Ravi Teja Darbha

TI__Guru 70391 points

Hi Ravi,

My apologies for delayed response,

i was stuck with lot of other issues in this mean time.

Ravi Teja Darbha said:
Could anyone tell me why RTI module has been grayed out in Halcogen?

As RTI module will be used for OS timer function in FreeRTOS, so HALCoGen will not generating any other generic time functions using RTI.

If you want to use watchdog in FreeRTOS code, then you need to manually add the code related to the watchdog.

Thanks & regards,
Jagadish.

0 Ravi Teja Darbha 9 months ago in reply to jagadish gundavarapu

Intellectual 305 points

Okay Thanks!

I manualy added the watchdog code and it seems to be working fine for most part. However, when it hits UNDEF exception handler (which is an infinite while loop), the watchdog does not trigger. Upon closer inspection, I noticed that the watchdog is completely disabled. Is this one of the cases where watchdog is disabled? If so, could tell me other cases where watchdog is disabled?

Thanks,

Ravi

0 jagadish gundavarapu 8 months ago in reply to Ravi Teja Darbha

TI__Guru 70391 points

Hi Ravi,

Ravi Teja Darbha said:
However, when it hits UNDEF exception handler (which is an infinite while loop), the watchdog does not trigger. Upon closer inspection, I noticed that the watchdog is completely disabled. Is this one of the cases where watchdog is disabled?

I didn't test particularly for undef exception.

But when i tested for prefetch and data aborts i saw watchdog did reset the core.

--
Thanks & regards,
Jagadish.

0 Ravi Teja Darbha 8 months ago in reply to jagadish gundavarapu

Intellectual 305 points

Hi Jagadish,

Could you check with your hardware team and let me know if watchdog is supposed to be disabled when it hits undef, data and prefetch abort exceptions?

Also, all other cases where the watchdog is disabled would also be helpful

Thanks,

Ravi

0 jagadish gundavarapu 8 months ago in reply to Ravi Teja Darbha

TI__Guru 70391 points

Hi Ravi,

Ravi Teja Darbha said:
Could you check with your hardware team and let me know if watchdog is supposed to be disabled when it hits undef, data and prefetch abort exceptions?

Exceptions and Watchdog functionality they both are independent.

The watchdog functionality is to just reset the core if it doesn't feed with in the configured time, irrespective of where the code hung.

Is it possible to share your code to me for debugging this issue from my end.

--
Thanks & regards,
Jagadish.