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hubmartin / WS2812B_STM32F3

WS2812 DMA library with low RAM needs. Up to 16 paralel outputs and thousands of LEDs on each of them
MIT License
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Only outputs "1"s (framebuffer probably not transferred correctly to DMA?) #7

Closed mnemocron closed 3 years ago

mnemocron commented 3 years ago

So I tested your code on two different STM32f3 Microcontrollers and I cannot get it to work. The library somehow works, because I get the correct timing at the output data pin (~1.2us per bit 2/3 on high, 1/3 on low). However, all the data that is sent is always "1"s turning all the colors to 255 on the LEDs itself.

I do not know why this is happening. Obviously the DMA and TIM are working otherwise I would not get an output signal. When debugging, I can see that the frameBuffer variable is updated and written to by visRainbow(). So somewhere after that the color info must get lost.

Tested on:

Using:

mnemocron commented 3 years ago

I just tested it again on my other computer with a fresh install of the CubeIDE and it worked. Somehow my installation seems to be f-ed up. I'll close the issue if it is resolved by a fresh install.

mnemocron commented 3 years ago

It is working with a fresh installation of STM32CubeIDE 1.7.0

mnemocron commented 3 years ago

Apparently that was not it.

On the f303re Nucleo 64 Board the PC0 PC1 work fine, but when I change it to PA5, only a bunch of ones are output all the time. Any idea what I need to change?

DS1Z_QuickPrint5

mnemocron commented 3 years ago

never mind, found the line ws2812b.item[0].channel = 5; for PA5

hubmartin commented 3 years ago

Glad it still works and people are using this lib :)

mnemocron commented 3 years ago

The documentation regarding the settings spread across multiple files is a bit sparse. But I finally figured it out. It is a pretty darn good example of DMA usage, Thanks a lot! :)

Meanwhile I adapted it to use TIM4 instead of TIM2 (because of PWM) and CC3 event instead of CC1 (because it blocks DMA1_ch1 for the ADC)

And then a few lines to work with RGBW type LEDs.

newguy commented 2 years ago

I am having problem making this work. I tried to complied the lib but it is giving error and warning.

Description Resource Path Location Type 'ws2812b_set_pixel' declared 'static' but never defined [-Wunused-function] ws2812b.h /ws2812b_f3/src/ws2812b line 90 C/C++ Problem

Description Resource Path Location Type initialization discards 'volatile' qualifier from pointer target type [-Wdiscarded-qualifiers] ws2812b.h /ws2812b_f3/src/ws2812b line 84 C/C++ Problem

Can you help me.

newguy commented 2 years ago

this too..

Description Resource Path Location Type in expansion of macro 'BITBAND_SRAM' ws2812b.c /ws2812b_f3/src/ws2812b line 458 C/C++ Problem