Task "wifi" is overflowing its stack sometimes and when I just checked the high water mark, it was 48 bytes (i.e. very close to stack overflow!). I am using v4.0 stable IDF. I don't see a CONFIG parameter to increase the stack for wifi. Although many other system tasks have adjustable sizes. Am I mi...

I adapted the bleprph example into my application. After several rounds of testing, it seems to hit a limit related to NVS and CCCD storage. If I try to pair (same phone always) after it reports having 8 CCCD already, the BLE task seems to hang and I eventually get a Task WDT reset. After this probl...

Thanks for the responses. I think things make sense now and since I do use the IDF, I can count on 8M as fast clock source.

I thought I was looking at the latest, v4.1 from Nov 2019.
https://www.espressif.com/sites/default ... ual_en.pdf
In section 30.3.7 Low-Power Clocks
???

In esp32 tech reference manual, fig 166 RTC Low-Power Clocks, it shows that the default clock source for RTC fast clock is CK_40M_DIG* (div 4). However, everything else I read, and try, indicates that the ~8.5 MHz internal osc is the source. For example, in esp_clk_init(), it has hardcoded rtc_clk_f...

@boarchuz, you mention forcing RTC peripherals on. I notice in the online docs that the RTC PERIPH domain supposedly includes ULP. esp_sleep_pd_domain_t Power domains which can be powered down in sleep mode. ESP_PD_DOMAIN_RTC_PERIPH - RTC IO, sensors and ULP co-processor. Did you first try changing ...

Thanks for responding! All my sensor GPIOs are among the RTC pins. I may try assigning ext1 wakeup for ESP32 and not ext0. The online docs don't mention caveats if using ext1. But I wonder if it draws extra power to support the ext1 mode? I will eventually measure the power draw when all three wake ...

I keep finding notes in the online documentation stating that revisions 0 and 1 of ESP32 have limitations with respect to ULP and deep sleep. For example, API description of esp_sleep_enable_ext0_wakeup(). In my project I need to be able to set three wakeup reasons at the same time and wake from dee...

Awesome info! Thanks for sharing your knowledge!

According to online documentation (quoted below), ULP code cannot change which of the 5 sleep time values is in use if the main system is in deep sleep. It would be very helpful for my project if the ULP code could choose a different timer without bringing ESP32 out of deep sleep. It does not seem t...