add ws2812 controller

go.mod

@@ -0,0 +1,5 @@
+module rpi-ci-led
+
+go 1.14
+
+require github.com/jgarff/rpi_ws281x v0.0.0-20200319211106-6a720cbd42d3

go.sum

@@ -0,0 +1,2 @@
+github.com/jgarff/rpi_ws281x v0.0.0-20200319211106-6a720cbd42d3 h1:Gmtr3J666u+wiChtQ49FYzcdd6UgX0aWoLciRPo3His=
+github.com/jgarff/rpi_ws281x v0.0.0-20200319211106-6a720cbd42d3/go.mod h1:xbXlgWZjA66nkwNqkT4ol2EqY7jL8v+1efK5ZnOT/MU=

main.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/signal"
+	"rpi-ci-led/pkg/ws2812b"
+	"syscall"
+
+	"github.com/joho/godotenv"
+)
+
+func main() {
+	fmt.Println("GO ci hook")
+
+	godotenv.Load()
+
+	ws2812b.Init(18, 20, 255)
+
+	lock := make(chan os.Signal)
+	signal.Notify(lock, syscall.SIGINT, syscall.SIGTERM)
+
+	// main
+
+	<-lock
+
+	ws2812b.Close()
+}

pkg/config/config.go

@@ -0,0 +1,16 @@
+package config
+
+type Server struct {
+	Port int `yaml:"port" env:"SERVER_PORT"`
+}
+
+type Config struct {
+	Server Server `yaml:"server"`
+}
+
+var c *Config
+
+func Load(p ...string) error {
+
+	return nil
+}

pkg/ws2812b/ws2812b.go

@@ -0,0 +1,60 @@
+package ws2812b
+
+import (
+	"errors"
+
+	"github.com/jgarff/rpi_ws281x/golang/ws2811"
+)
+
+type LED struct {
+	GPIO       int
+	Count      int
+	Brightness int
+	IsInit     bool
+}
+
+var led *LED
+
+func Init(gpio, count, brightness int) (*LED, error) {
+	if led != nil && led.IsInit == true {
+		ws2811.Clear()
+		ws2811.Fini()
+	}
+
+	err := ws2811.Init(gpio, count, brightness)
+	if err != nil {
+		return nil, err
+	}
+
+	led = &LED{
+		GPIO:       gpio,
+		Count:      count,
+		Brightness: brightness,
+		IsInit:     true,
+	}
+
+	return led, nil
+}
+
+func Close() {
+	ws2811.Clear()
+	ws2811.Fini()
+}
+
+func ClearAll() {
+	ws2811.Clear()
+}
+
+func WriteColor(pos int, color uint32) error {
+	if pos < 0 || pos > led.Count {
+		return errors.New("position out of range")
+	}
+
+	ws2811.SetLed(pos, color)
+	if err := ws2811.Render(); err != nil {
+		ws2811.Clear()
+		return err
+	}
+
+	return nil
+}