Raspberry Pi with Go lang

// This program achieves LED blink on Raspberry Pi with Go lang.
// This is implemented with hard-coding and uses only main function.

package main

import (
        "fmt"
        "os"
        "time"
)

func main() {
        // Initialize GPIO25
        fmt.Println("Initialize GPIO25")
        fd,err := os.OpenFile("/sys/class/gpio/export",os.O_WRONLY|os.O_SYNC,0666)
        if err != nil {
                fmt.Println("open /sys/class/gpio/export fails")
                fmt.Println(err)
                return
        }
        fmt.Fprint(fd,"25")
        fd.Close()

        // Check iinitialization result
        fmt.Println("Check initialization result")
        _,err = os.Stat("/sys/class/gpio/gpio25")
        if err != nil {
                fmt.Println("Export GPIO25 fails")
                fmt.Println(err)
        } else {
                fmt.Println("Export GPIO25 succeeds")
        }

        // Set direction to out
        fmt.Println("Set direction of GPIO25 to out")
        fd,err = os.OpenFile("/sys/class/gpio/gpio25/direction",0666)
        if err != nil {
                fmt.Println("open /sys/class/gpio/gpio25/direction fails")
                fmt.Println(err)
        }
        fmt.Fprint(fd,"out")
        fd.Close()

        // Start blink
        fmt.Println("Start blink")
        for i := 0; i < 20; i++ {
                fd,err := os.OpenFile("/sys/class/gpio/gpio25/value",0666)
                if err != nil {
                        fmt.Println("open /sys/class/gpio/gpio25/value fails")
                        fmt.Println(err)
                }
                if i%2 == 1 {
                        // Turn on LED
                        fmt.Fprint(fd,1)
                } else {
                        // Turn off LED
                        fmt.Fprint(fd,0)
                }
                fd.Close()
                time.Sleep(100 * time.Millisecond)
        }

        // End
        fmt.Println("Start finalizing")
        fd,err = os.OpenFile("/sys/class/gpio/gpio25/value",0666)
        if err != nil {
                fmt.Println("open /sys/class/gpio/gpio25/value fails")
                fmt.Println(err)
        }
        // Turn off LED
        fmt.Println("Turn off LED")
        fmt.Fprint(fd,0)

        fd.Close()

        fd,err = os.OpenFile("/sys/class/gpio/unexport",0666)
        if err != nil {
                fmt.Println("open /sys/class/gpio/unexport fails")
                fmt.Println(err)
                return
        }
        fmt.Fprint(fd,"25")
        fd.Close()
        fmt.Println("End finalizing")

}

http://shang.qq.com/wpa/qunwpa?idkey=912ee9f1c4d48fd64877a62ce321ca041ff6780dee63a5ccaa07241719ea5be9多语言/高并发研究群

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