Go bindings for rpi_ws281x, a userspace Raspberry Pi PWM library for WS281X LEDs. Supports any Raspberry and WS2812, SK6812RGB and SK6812RGBW LEDs strips, this includes Unicorn pHAT and NeoPixels.
This fork adds compatibility to the latest version of rpi_ws281x (by linking libm) and adjusts the install instructions to assume that cross-compilation is the default (as opposed to directly compiling on a Raspberry Pi).
The recommended way to install go-rpi-ws281x (on Debian) is by cross-compiling the original rpi_ws281x library (using scons and the appropriate gcc cross-compiler) and copying the header and library files into the correct multiarch locations:
apt install scons gcc-aarch64-linux-gnu
git clone https://github.com/jgarff/rpi_ws281x
cd rpi_ws281x
scons V=yes TOOLCHAIN=aarch64-linux-gnu
cp ws2811.h /usr/aarch64-linux-gnu/include/ws2811.h
cp rpihw.h /usr/aarch64-linux-gnu/include/rpihw.h
cp pwm.h /usr/aarch64-linux-gnu/include/pwm.h
cp libws2811.a /usr/aarch64-linux-gnu/lib/libws2811.a// create a new canvas with the given width and height, and the config, in this
// case the configuration is for a Unicorn pHAT (8x4 pixels matrix) with the
// default configuration
c, _ := ws281x.NewCanvas(8, 4, &ws281x.DefaultConfig)
// initialize the canvas and the matrix
c.Initialize()
// since ws281x implements image.Image any function like draw.Draw from the std
// library may be used with it.
//
// now we copy a white image into the ws281x.Canvas, this turn on all the leds
// to white
draw.Draw(c, c.Bounds(), image.NewUniform(color.White), image.ZP, draw.Over)
// render and sleep to see the leds on
c.Render()
time.Sleep(time.Second * 5)
// don't forget close the canvas, if not you leds may remain on
c.Close()MIT, see LICENSE