OK, thanks

To be clear, is your ULP program ending immediately after it reports the power supply down state? Or does it continue to run while in deep sleep? Wow! Good point :D :D It works now, after i inserted the stop code below from the example (duh!) WRITE_RTC_FIELD(RTC_CNTL_STATE0_REG, RTC_CNTL_ULP_CP_SLP...

I have a setup where we use the ULP to poll the power supply every 1ms in order to get an early warning for taking the ESP32 into deepsleep. This works just fine with code along the lines of: ulp_set_wakeup_period(0, 1000); // Set ULP wake up period to 1ms ulp_threshold = ref * 95 / 100; adc1_ulp_en...

Hi Angus. Thanks for replying. The ESP32 is powered on VDD3P3_RTC by a coin cell throughout the powerdown. We are monitoring the supply with the ULP for going into deepsleep, and then using the same pin as a GPIO for wakeup (as per the code above). I *might* have seen this on rare occasions without ...

I have seen this then the ESP was waking up from deepsleep. Is there some kind of low level issue here! Espressif guys? The chip was woken on a GPIO: ESP_ERROR_CHECK(esp_sleep_enable_ext0_wakeup(LG_GPIO_PSDOWN, 1)); esp_deep_sleep_start(); Causing this PREAMBLE: This is an ESP32 chip with 2 CPU core...

As mentioned in the above issue, I have created this gist which packs Ed Smallenburg's arduino sketch as an iterator.

It can iterate with a prefix in a specified namespace or across all namespaces. There is even an example to look at ..

/Flemming

Also: I think the documentation for 'wake' is a bit unclear on this: It specifically says you have to wait for RTC_CNTL_RDY_FOR_WAKEUP, otherwise the instruction will have no effect .. I guess some clarification in the docs regarding this issue would be nice

Ahh. OK, and thanks!

Will it be OK to call 'wake' without waiting for RTC_CNTL_RDY_FOR_WAKEUP when power is on?
This way I can use the ULP for watching the voltage level on the GPIO and generate an RTC interrupt without polling from the main CPU.

/Flemming

It is entering deepsleep. The debugging is done by just starting the ULP while the power is on. Ie. not entering deepsleep, but just watching the ulp_* variables I start the code like below at boot time in order to debug the ULP ulp_set_wakeup_period(0, 200000); // Set ULP wake up period to 200ms ES...

I must be doing something wrong here! But what is it?! I have an ULP program to wake the CPU when an RTC GPIO has been high for a full second (5 iterations of 200ms). However, as shown in the IDF examples, there must be a loop awaiting the RTC_CNTL_RDY_FOR_WAKEUP flag before we can call wake. It see...