Basic Golang Examples

golang/README.md

@@ -0,0 +1,20 @@
+## Run a demo
+
+As this is just a Go wrapper for the library you must clone this into your `$GOPATH` as you would any other Go program. 
+Your path to the project should be:
+```
+  $GOPATH/src/github.com/jgraff/rpi_ws281x
+```
+
+
+As listed in the `ws2811.go` file ensure to copy `ws2811.h`, `rpihw.h`, and `pwm.h` in a GCC include path (e.g. `/usr/local/include`) and
+`libws2811.a` in a GCC library path (e.g. `/usr/local/lib`).
+
+To run the basic example run the following commands:
+```
+  cd golang/examples
+  go build basic.go
+  sudo ./basic
+```
+
+If everything worked you should see a basic color wipe for the first 16 LEDs on your strip.

golang/examples/basic.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"time"
+	"os"
+	"fmt"
+
+	"github.com/jgarff/rpi_ws281x/golang/ws2811"
+)
+
+const (
+	pin = 18
+	count = 16
+	brightness = 255
+)
+
+func main() {
+	defer ws2811.Fini()
+	err := ws2811.Init(pin, count, brightness)
+	if err != nil {
+		fmt.Println(err)
+	} else {
+		fmt.Println("Press Ctr-C to quit.")
+		fmt.Println("Creating blue color wipe")
+		err = colorWipe(uint32(0x000020))
+		if err != nil {
+			fmt.Println("Error during wipe " + err.Error())
+			os.Exit(-1)
+		}
+
+		fmt.Println("Creating red color wipe")
+		err = colorWipe(uint32(0x002000))
+		if err != nil {
+			fmt.Println("Error during wipe " + err.Error())
+			os.Exit(-1)
+		}
+
+		fmt.Println("Creating green color wipe")
+		err = colorWipe(uint32(0x200000))
+		if err != nil {
+			fmt.Println("Error during wipe " + err.Error())
+			os.Exit(-1)
+		}
+	}
+}
+
+func colorWipe(color uint32) error {
+	for i := 0; i < count; i++ {
+		ws2811.SetLed(i, color)
+		err := ws2811.Render()
+		if err != nil {
+			ws2811.Clear()
+			return err
+		}
+
+		time.Sleep(50 * time.Millisecond)
+	}
+
+	return nil
+}

golang/ws2811/ws2811.go

@@ -25,7 +25,7 @@
 
 /*
 Interface to ws2811 chip (neopixel driver). Make sure that you have
-ws2811.h and pwm.h in a GCC include path (e.g. /usr/local/include) and
+ws2811.h, rpihw.h, and pwm.h in a GCC include path (e.g. /usr/local/include) and
 libws2811.a in a GCC library path (e.g. /usr/local/lib).
 See https://github.com/jgarff/rpi_ws281x for instructions
 */