82 lines
1.5 KiB
Go
82 lines
1.5 KiB
Go
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")
|
|
}
|