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README.md

stm32-neopixel

This demo is designed to run on an STM32 microcontroller and some additional hardware, detailed below:

  1. An STM32F746G Discovery kit
  2. A 3.3V to 5V level shifter such as Texas Instrument's TXB0104 which can be found on a breakout board for easier use, such as: SparkFun Voltage-Level Translator Breakout
  3. A NeoPixel WS2812 or compatible LED Strip; such as: SparkFun LED RGB Strip
  4. A breadboard, such as: SparkFun Translucent Breadboard
  5. A 5V power supply

Connect the components as shown in the schematic below:

schematic

We recommend including a capacitor across the LED strip power supply.

How to build and run this example:

  • Connect the STM32F746G-DISCO board via the ST-LINK USB port to your Mac.
  • Make sure you have a recent nightly Swift toolchain that has Embedded Swift support.
  • Install the stlink (https://github.com/stlink-org/stlink) command line tools, e.g. via brew install stlink.
  • Build and upload the program to flash memory of the STM:
$ cd stm32-neopixel
$ export TOOLCHAINS='<toolchain-identifier>'
$ make
$ st-flash --reset write .build/release/Application.bin 0x08000000
  • The LED strip should light up and slowly animate a color gradient.