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Gabriel Augendre 2021-09-18 19:13:35 +02:00
commit de8fb78674
3 changed files with 270 additions and 0 deletions

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module git.augendre.info/gaugendre/go-gpio-playground
go 1.17
require github.com/warthog618/gpiod v0.6.0
require golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae // indirect

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github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
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github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
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github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
github.com/warthog618/config v0.4.1/go.mod h1:IzcIkVay6dCubN3WBAJzPuqHyE1fTPxICvKTQ/2JA9g=
github.com/warthog618/gpiod v0.6.0 h1:akX8p4pL99m/wxhuknuh2vWS9BJ/N+eguts9ON8Lmjs=
github.com/warthog618/gpiod v0.6.0/go.mod h1:RDkm3Ur6o0Wam7cSkyLuVMghs1CHlfdlnUfRMRyDc+w=
github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
go.etcd.io/bbolt v1.3.3/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
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go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
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main.go Normal file
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package main
import (
"context"
"fmt"
"log"
"net/http"
"os"
"os/signal"
"sync"
"syscall"
"time"
"github.com/warthog618/gpiod"
"github.com/warthog618/gpiod/device/rpi"
)
var ledState = 1
var ledLine *gpiod.Line
var ledMutex = &sync.Mutex{}
func main() {
chip := setupGpio()
defer chip.Close()
defer cleanupLedLine(ledLine)
startServer()
}
func setupGpio() (c *gpiod.Chip) {
c, err := gpiod.NewChip("gpiochip0")
if err != nil {
panic(err)
}
led := rpi.J8p7
ledLine, err = c.RequestLine(led, gpiod.AsOutput(ledState))
if err != nil {
panic(err)
}
return
}
func cleanupLedLine(line *gpiod.Line) {
log.Println("Reverting pin to input")
line.Reconfigure(gpiod.AsInput)
line.Close()
}
func startServer() {
mux := http.NewServeMux()
mux.HandleFunc("/", toggleLed)
server := &http.Server{Addr: ":4000", Handler: mux}
// Setting up signal capturing
stop := make(chan os.Signal, 1)
signal.Notify(stop, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
go func() {
if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
log.Fatalf("listen: %s\n", err)
}
}()
log.Print("Server Started")
<-stop
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err := server.Shutdown(ctx); err != nil {
log.Fatalf("Error during shutdown: %+v", err)
}
}
func toggleLed(w http.ResponseWriter, r *http.Request) {
ledMutex.Lock()
ledState ^= 1
ledLine.SetValue(ledState)
ledMutex.Unlock()
log.Println("Toggle led")
w.WriteHeader(200)
fmt.Fprintln(w, "Toggling led")
}