On Thu, May 18, 2023 at 8:53 PM Alan C. Assis wrote: > Hi Tomek, > > I don't think you can get ws2812 working directly using a GPIO over > bitbang, the protocol used by this chip is very time sensitive. > Actually even in SPI mode I failed to get it working, I tried it on > stm32f103-minimum and stm32f4discover because AFAIK originally Brennan > implemented and tested the driver in STM32.
Whoops o_O There are two problems: 1. ws2812 application not talking to the (working) /dev/led_rgb what I would love to understand and solve in the first place as my learning curve :-) 2. WS2812 timing pains. I know it is possible to drive WS2812 from ESP32 because I have done that already on MicroPyhon both with GPIO bitbang and even better with RMT peripheral that makes it walk in the park (we can make one for NuttX!!) :-) I have already whole bunch WS2812-MINI WS2813 etc already purchased in the boxes and on boards so I cannot really replace them at this point.. but thank you for the APA102 / SK9822 hints I never used them and they may be better solution for smaller MCUs! :-) As for now I just need to make at least one RGB LED shine green or red so anything else can stop for that short time (~1.2us). Is there a some sort of compatibility matrix in NuttX to quickly see what peripheral will work on what hardware.. in terms of what has been proven to work? Maybe a Kconfig confirmation/warning flag? Or its always trial-and-error-evaluation? > For GDB debug you will need a ESP-Prog or some OpenOCD compatible JTAG > programmer. > More info here: > https://acassis.wordpress.com/2021/05/12/debugging-esp32-using-openocd-and-gdb/ Yeah I have whole bunch of JTAG probes and I have created initial port of OpenOCD for FreeBSD.. I was wondering is there any other way I would like to debug this situation on a running production device where JTAG pins are already used by peripherals? For instance GDB that runs on target nsh over UART/Telnet? Alternatively, I am considering trying out the same application running on a ESP32-C3 (with the same GPIO and RMT I guess?) that has this magic USB/JTAG port, because I never used that before, and NuttX portability allows me to rebuild everything for a different hardware in 17 sec that is faster than I reach out to my cables box :-) :-) -- CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
