NeoPixel LED Lights with STM32 HAL, Timer & DMA — The VFD Collective. SK6812: #LEDs ≈ (1 / 30 Hz - 50 µs) / (40 µs + 0.5 µs) = 821WS2812: #LEDs ≈ (1 / 30 Hz - 50 µs) / (30 µs + 0.5 µs) = 1091 You will actually find numbers close to these inside the datasheet.
To control more than 800 LEDs, simply have more than one transfer channel. If you really wish to try this out in the wild, there are a more things to be aware of, power (supply) wise in particular. Now comes the part where we think of how we want to program the STM32F0, so that it can speak with the NeoPixel. Just as I’ve said before, we want to look for a resource saving approach, and one way to do so is to use a Timer configured in PWM output mode, that gets it data from a DMA buffer. Setting the Timer First, let’s see how we need to configure our timer to get pulses shooting at 800 kHz. F_TIM = f_CLK / (Timer Prescaler + 1) / (Counter Period + 1) Remember we set f_CLK to 48 MHz? Counter period = 60 - 1 = 59 we exactly get 800 kHz for f_TIM. For a logical 0, the pulse is switched on 32% of the time.
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Can you copypasta my stuff? Yes! The content on this site is public domain, and I couldn't care less what you use or how you use it. Anything else would defeat the purpose of the site, which is to facilitate knowledge transfer and make life easier for programmers.