Esp32-C6 API for disabling RTC watchdog (IDFGH-11913)

[txf-]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

As per the C6 feature support thread, I am now posting this as a general issue and whilst in my case it applies to C6, I think it may also be a problem on anything other than the ESP32 and S2.

On menuconfig, there is is option to allow disabling the watchdog in user code. I can't actually find any documentation related to this for anything other than the above mentioned microcontrollers.

As far as I can tell there rtc_wdt_disable() and rtc_wdt_feed(), do not apply to anything but the ESP32 and ESP32-S2 as those functions seem to be guarded by ifdefs for those devices.

Do equivalent functions exist for other devices?

I am currently using the 5.2 release branch

[KonstantinKondrashov]

Hi @txf-!
Thanks for noticing that.
Yes, these functions do exist only for ESP32 and S2. The API is obsolete so you need to use a new one (wdt_hal) which is available for all chips.

    if(CONFIG_IDF_TARGET_ESP32 OR CONFIG_IDF_TARGET_ESP32S2)
        list(APPEND srcs "rtc_wdt.c")
    endif()

I will update the Kconfig description to mention to use these APIs instead.

wdt_hal_context_t rtc_wdt_ctx = RWDT_HAL_CONTEXT_DEFAULT();
wdt_hal_write_protect_disable(&rtc_wdt_ctx);
wdt_hal_disable(&rtc_wdt_ctx);
wdt_hal_write_protect_enable(&rtc_wdt_ctx);

There is a comment about this option in the doc - https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/bootloader.html#watchdog

[txf-]

Thanks, comment in the doc also needs to be changed, because it is talking about the same functions as the Kconfig.

Also in the docs , the section in System API -> watchdogs. Has no mention of this API, it doesn't really talk about the RTC watchdog.