Search found 391 matches

by Deouss
Sat Apr 20, 2019 1:35 pm
Forum: Sample Code
Topic: Simple ULP Blink Example
Replies: 6
Views: 3382

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: 652

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: 749

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: 13702

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: 1000

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: 60
Views: 37377

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: 749

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: 749

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 ...
by Deouss
Mon Apr 08, 2019 5:41 pm
Forum: General Discussion
Topic: RTOS running on one core only
Replies: 32
Views: 4834

Re: RTOS running on one core only

Yes) All that you mentioned here are nice computer science definitions that are hard to achieve perfectly working in real world :) I can tell you from experience - any tricks as those cooperative manipulations with ported or structurally incompatible code - they lead to serious conflicts and future ...

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