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88 lines
3.7 KiB
Markdown
88 lines
3.7 KiB
Markdown
# go-rpi-rgb-led-matrix [](https://godoc.org/github.com/mcuadros/go-rpi-rgb-led-matrix) [](https://travis-ci.org/mcuadros/go-rpi-rgb-led-matrix)
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<img width="250" src="https://cloud.githubusercontent.com/assets/1573114/20248154/c17c1f2e-a9dd-11e6-805b-bf7d8ee73121.gif" align="right" />
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Go binding for [`rpi-rgb-led-matrix`](https://github.com/hzeller/rpi-rgb-led-matrix) an excellent C++ library to control [RGB LED displays](https://learn.adafruit.com/32x16-32x32-rgb-led-matrix/overview) with Raspberry Pi GPIO.
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This library includes the basic bindings to control de LED Matrix directly and also a convenient [ToolKit](https://godoc.org/github.com/mcuadros/go-rpi-rgb-led-matrix#ToolKit) with more high level functions. Also some [examples](https://github.com/mcuadros/go-rpi-rgb-led-matrix/tree/master/examples) are included to test the library and the configuration.
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The [`Canvas`](https://godoc.org/github.com/mcuadros/go-rpi-rgb-led-matrix#Canvas) struct implements the [`image.Image`](https://golang.org/pkg/image/#Image) interface from the Go standard library. This makes the interaction with the matrix simple as work with a normal image in Go, allowing the usage of any Go library build around the `image.Image` interface.
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To learn about the configuration and the wiring go to the [original library](https://github.com/hzeller/rpi-rgb-led-matrix), is highly detailed and well explained.
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Installation
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------------
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The recommended way to install `go-rpi-rgb-led-matrix` is:
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```sh
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go get github.com/mcuadros/go-rpi-rgb-led-matrix
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```
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Then you will get an **expected** error like this:
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```
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# github.com/mcuadros/go-rpi-rgb-led-matrix
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/usr/bin/ld: cannot find -lrgbmatrix
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collect2: error: ld returned 1 exit status
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```
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This happens because you need to compile the `rgbmatrix` C bindings:
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```sh
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cd $GOPATH/src/github.com/mcuadros/go-rpi-rgb-led-matrix/vendor/rpi-rgb-led-matrix/
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git submodule update --init
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make
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cd $GOPATH/src/github.com/mcuadros/go-rpi-rgb-led-matrix/
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go install -v ./...
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```
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Examples
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--------
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Setting all the pixels to white:
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```go
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// create a new Matrix instance with the DefaultConfig
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m, _ := rgbmatrix.NewRGBLedMatrix(&rgbmatrix.DefaultConfig)
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// create the Canvas, implements the image.Image interface
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c := rgbmatrix.NewCanvas(m)
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defer c.Close() // don't forgot close the Matrix, if not your leds will remain on
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// using the standard draw.Draw function we copy a white image onto the Canvas
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draw.Draw(c, c.Bounds(), &image.Uniform{color.White}, image.ZP, draw.Src)
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// don't forget call Render to display the new led status
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c.Render()
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```
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Playing a GIF into your matrix during 30 seconds:
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```go
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// create a new Matrix instance with the DefaultConfig
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m, _ := rgbmatrix.NewRGBLedMatrix(&rgbmatrix.DefaultConfig)
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// create a ToolKit instance
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tk := rgbmatrix.NewToolKit(m)
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defer tk.Close() // don't forgot close the Matrix, if not your leds will remain on
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// open the gif file for reading
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file, _ := os.Open("mario.gif")
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// play of the gif using the io.Reader
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close, _ := tk.PlayGIF(f)
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fatal(err)
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// we wait 30 seconds and then we stop the playing gif sending a True to the returned chan
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time.Sleep(time.Second * 30)
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close <- true
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```
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The image of the header was recorded using this few lines, the running _Mario_ gif, and three 32x64 pannels.
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<img src="https://cloud.githubusercontent.com/assets/1573114/20248173/2e2f97ae-a9de-11e6-95e6-e0548199501d.gif" align="right" width="100" />
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Check the folder [`examples`](https://github.com/mcuadros/go-rpi-rgb-led-matrix/tree/master/examples) folder for more examples
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License
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-------
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MIT, see [LICENSE](LICENSE)
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