ULP running in background

cruzxia
Posts: 3
Joined: Mon Aug 28, 2017 4:49 am

ULP running in background

Postby cruzxia » Wed Aug 30, 2017 2:45 am

I am working on a project that needs to run in low power battery backup mode if the mains fails.
I have to increment some timing variables with a 1ms base, and they need to run uninterrupted non stop.
I am using an external 32768 crystal to run the RTC.
Currently I am using an interrupt timer on the main processor to run the timing, I was hoping to migrate it into the ULP.

My questions are:

1. If I setup the ULP to increment the timing variables, can I leave it running in an endless timing loop whilst the main processor is operating?
2. Can I read the timing variables in the main processor while the ULP is running?
3. How do I access the ULP variables from the main processor?
4. What is the processor speed of the ULP?

If the power fails I was planning to enable ULP wake up and enter deep sleep.
The main processor could then be woken via button push or ADC voltage level (power restored) in the ULP.

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ESP_krzychb
Posts: 400
Joined: Sat Oct 01, 2016 9:05 am
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Re: ULP running in background

Postby ESP_krzychb » Wed Aug 30, 2017 6:35 am

Hi cruzxia,
1. If I setup the ULP to increment the timing variables, can I leave it running in an endless timing loop whilst the main processor is operating?
Yes
2. Can I read the timing variables in the main processor while the ULP is running?
Yes
3. How do I access the ULP variables from the main processor?
See https://github.com/espressif/esp-idf/tr ... system/ulp
4. What is the processor speed of the ULP?
ULP uses RTC_FAST_CLK, which is 8 MHz

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