Search found 372 matches

by Deouss
Sat Apr 20, 2019 2:43 pm
Forum: Sample Code
Topic: Simple ULP Blink Example
Replies: 3
Views: 911

Re: Simple ULP Blink Example

The idea is to compile ulp.s file into binary and load it with code.
Simple task but not easy. There is nothing explained how to use binutils-esp32ulp
by Deouss
Sat Apr 20, 2019 1:35 pm
Forum: Sample Code
Topic: Simple ULP Blink Example
Replies: 3
Views: 911

Re: Simple ULP Blink Example

Any ideas how I use it without PlatformIO and under Windows additionally with CMake?
by Deouss
Mon Apr 15, 2019 1:14 pm
Forum: General Discussion
Topic: Maximum performance of CPU only
Replies: 2
Views: 222

Maximum performance of CPU only

Let's say I want to do some very heavy calculations as fast as possible by esp CPU. After calculations also need to perform super fast bit-banging - unfortunately there is no work around. During that time nothing can interrupt of interfere with that calculations. How to properly achieve that? What i...
by Deouss
Sun Apr 14, 2019 1:49 am
Forum: General Discussion
Topic: WS2812B - timings and accuracy
Replies: 3
Views: 284

Re: WS2812B - timings and accuracy

I managed to display RGB full color bitmap from PC - actually a 8x32pixels chunk. However the picture looks very very bright - seems like colors need calibration - I think it is contrast and saturation. I must check that later Here is the code that may help to experiment with SPI and WS281B matrix: ...
by Deouss
Fri Apr 12, 2019 3:54 pm
Forum: General Discussion
Topic: LLVM for Xtensa
Replies: 8
Views: 6408

Re: LLVM for Xtensa

Have you tried it under Microsoft Visual studio 2017 ?
by Deouss
Fri Apr 12, 2019 1:45 am
Forum: Hardware
Topic: ESP32 can't talk to LAN8270 <SOLVED>
Replies: 3
Views: 228

Re: ESP32 can't talk to LAN8270 <SOLVED>

I just got my long awaited LAN8720 module and wanted to make it work with my network.
Can you share the code or point to good example? Also any advices ?
Thanks
by Deouss
Thu Apr 11, 2019 12:33 pm
Forum: Showcase
Topic: I2S-parallel example: Drive a 64x32 display
Replies: 56
Views: 26308

Re: I2S-parallel example: Drive a 64x32 display

I was trying to find out what performance (fps) was achieved displaying on that panels. Couldn't see what is actually a best technique for non-flicker and full 24bit RGB (or more?) lights. That fastled library looks very chaotic and seems to be using only RMT for esp - for ATMega all is time-aligned...
by Deouss
Wed Apr 10, 2019 3:19 am
Forum: General Discussion
Topic: WS2812B - timings and accuracy
Replies: 3
Views: 284

Re: WS2812B - timings and accuracy

So I just investigated all those timings a little and I am able to use a simple SPI to fully control WS2812B 32*8 led matrix. It is very simple and it seems like those timings are based on 1:4 ratio to 'lowest 0 high' ) Therefore 1 rgb bit of led is half a byte so one full rgb pixel is 12bytes - sti...
by Deouss
Tue Apr 09, 2019 3:48 pm
Forum: General Discussion
Topic: WS2812B - timings and accuracy
Replies: 3
Views: 284

WS2812B - timings and accuracy

So I am reading the documentation of WS2812B and see that sometimes they list different timing values f.ex. T0H - 4us and 0.35us in othes docs T0L/T1H - 0.8/0.85us and 0.9us. I am not sure what's going on and how those leds are properly controlled with what timings? Are there some min/max values or ...

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