Hello, I've a setup with an ESP8266 running FastLED and some WS2812B. The LEDs act correctly (besides some flickering that I tried to debug - which seems to be an issue with interrupts on the ESP). The PD did not found any "1" Bit before the first LED or somewhere later in the chain. With the timing instead of the duty cycle approach it works fine.
The problem might be, that a period is slightly longer than the minimal possible with this setup (but not "long enough" to trigger a reset)? Anyway, the duty cycle approach is still there and working by default. You can now select the WS2812B specific timin mode with a dropdown in the decoder setup. -- Jan * Vladimir Ermakov <vooon...@gmail.com> [2017-05-11 06:41]: > Hello Jan, > > I actually tested that decoder on WS2812B (when i writing driver for > STM32F373). > I decided to use duty cycle to be frequency independent, that approach > should work fine with slower versions (400 kbit/s), > but yes, it may incorrectly decode if you have longer T1L. > > But i don't seen that problem with UART based driver (using pseudo 7n2, pin > inverter & data inverter of F3 USART module) > where each 3-rd bit has longer TxL. > > 2017-05-11 5:23 GMT+03:00 Jan Losinski <losin...@wh2.tu-dresden.de>: > > > Hello, > > > > I extended the WS281X protocol decoder because it did not correctly > > decode data for WS2812B. It is now selectable if the user wants the > > generic approach that measures the fraction of the HIGH time in a period > > or the timings from the WS2812B spec. > > > > The code can be pulled from > > https://github.com/janLo/libsigrokdecode/tree/WS2812B > > > > Thanks a lot, Jan > > > > ------------------------------------------------------------ > > ------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > sigrok-devel mailing list > > sigrok-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/sigrok-devel > > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > sigrok-devel mailing list > sigrok-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sigrok-devel
signature.asc
Description: PGP signature
------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________ sigrok-devel mailing list sigrok-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sigrok-devel
