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by ESP_Sprite
Thu Jun 21, 2018 1:40 am
Forum: ESP32 IDF
Topic: Ram(memory) heap fragmentation.
Replies: 9
Views: 383

Re: Ram(memory) heap fragmentation.

What we use is effectively a custom implementation of the heap_5 algorithm, if memory serves, so it coalesces free blocks. There's not much you can configure on it: if it sees two adjacent free blocks, it simply joins them.
by ESP_Sprite
Wed Jun 20, 2018 8:07 am
Forum: Hardware
Topic: ESP32 5GHz
Replies: 1
Views: 80

Re: ESP32 5GHz

Yes; it is not 5GHz capable at all.
by ESP_Sprite
Wed Jun 20, 2018 4:27 am
Forum: General Discussion
Topic: GPIO20 redundance (not be used)?
Replies: 7
Views: 166

Re: GPIO20 redundance (not be used)?

I think the pin was intended for the /CS line of a flash chip internal to the package. While it was never used as such, the PSRAM code does use it as an intermediate internal signal wire to delay a signal by one or two clock cycles.
by ESP_Sprite
Wed Jun 20, 2018 2:41 am
Forum: ESP32 IDF
Topic: Undefined reference to NVS
Replies: 5
Views: 111

Re: Undefined reference to NVS

That's interesting... esp-idf doesn't have an explicit component called 'core', just some directories in the lwip and btc directories. Those shouldn't 'count' as components and shouldn't be override-able by another component that's called like this. Any chance you can set up a minimal example of thi...
by ESP_Sprite
Wed Jun 20, 2018 2:34 am
Forum: Hardware
Topic: ESP32 Strapping bits - what does GPIO4 do ?
Replies: 2
Views: 94

Re: ESP32 Strapping bits - what does GPIO4 do ?

It actually is used to select a few options in the more obscure bootstrap methods that the ESP32 has that normally aren't available - things like legacy boot modes, ATE testing modes, diagnostics modes etc. If you use the normal boot modes, the pin is recorded but ignored by the ROM - you probably a...
by ESP_Sprite
Tue Jun 19, 2018 8:47 am
Forum: General Discussion
Topic: SMALL_TEST in FreeRTOSConfig.h
Replies: 3
Views: 94

Re: SMALL_TEST in FreeRTOSConfig.h

We'd advise not to mess in the freertos config as some other components are dependent on certain things set to certain values. With that being said: Is there a reason you need to change this?
by ESP_Sprite
Tue Jun 19, 2018 5:54 am
Forum: ESP32 IDF
Topic: Rf based positioning using phase differences
Replies: 2
Views: 93

Re: Rf based positioning using phase differences

Hold that thought: something has been recently merged. Does https://esp-idf.readthedocs.io/en/latest/api-guides/wifi.html#wi-fi-channel-state-information do what you want?
by ESP_Sprite
Tue Jun 19, 2018 2:49 am
Forum: ESP32 IDF
Topic: .Net Micro Framework on ESP32 chip
Replies: 14
Views: 4527

Re: .Net Micro Framework on ESP32 chip

Someone at Espressif is writing an LLVM backend for the Xtensa right now. I'd wait for that. Oh wow, that is amazing! Where did you hear this? I can't seem to find it. Not sure where he heard it, but it's true. We'll probably release an ESP8266 version first, as that architecture is a bit simpler (...
by ESP_Sprite
Tue Jun 19, 2018 1:22 am
Forum: ESP32 IDF
Topic: Rf based positioning using phase differences
Replies: 2
Views: 93

Re: Rf based positioning using phase differences

I think the hardware actually should have support for this (with a few restrictions, as in, if I recall correctly it only works for certain encodings), however the drivers do not have functionality to output the associated data yet. Also, the functionality is mostly untested so we don't know if it w...
by ESP_Sprite
Tue Jun 19, 2018 1:17 am
Forum: Hardware
Topic: TX Power Consumption with Impedance Mismatch
Replies: 3
Views: 149

Re: TX Power Consumption with Impedance Mismatch

That would indeed be a good feature to have. I'll ask around to see if we can implement this. Edit: Analog people tell me they are working on this and have a possible way to do this (both the no-antenna-detection as well as the power draw when no antenna is connected) but they need to run tests to s...

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