STM32 Tutorial #37 - HOWTO use WS2812 RGB LEDs (aka. NeoPixel) (PWM + DMA)

How to drive WS2812 NeoPixel RGB LEDs with a STM32. In this video we'll go through my library which uses Timer PWM + DMA to drive a string WS2812 NeoPixel RGB LEDs.

The complete development of a WS2812 library is probably too long to explain in one video, so we will merely go through the details of an existing library.

Adding Custom USB HID to set the LEDs is described in this video:    • STM32 Tutorial #69 - WS2812 USB HID Contro...  

An alternative approach to RGB LEDs can be found here:    • STM32 Tutorial #63 - COOL I2C RGB LED Board  

We will be using a STM32F411 Black Pill board ( https://stm32world.com/wiki/Black_Pill ) for this example. Wiki page for the library is here: https://stm32world.com/wiki/STM32_WS2...)

Source code for the example and library is here: https://github.com/lbthomsen/stm32-ws...

#stm32 #tutorial #ws2812 #ws2812b #neopixel #timer #pwm #dma #stm32world #arduino

00:00 Intro
00:55 Introducing RGB LEDs
02:19 Introducing the WS2812 NeoPixel
04:22 Explaining the WS2812 Protocol
08:45 Alternatives to bit-banging - SPI and PWM
11:05 Github repository
12:15 The project setup in STM32CubeMX
13:00 Calculating the timer count to get 800 kHz
16:25 The basic code
17:00 The WS2812 library header and source
21:20 Explaining the library handler
24:20 Color lookup table
26:05 The C library source - initialization
27:38 The meat of the library - the callback!
29:00 Explaining the state machine
30:44 Updating the DMA buffer
33:14 Testing the code
34:17 Adding a demo
34:55 Running the demo
37:15 Call for ideas