Edge event example

examples/event/event.go

@@ -0,0 +1,48 @@
+/*
+
+An example of edge event handling by @Drahoslav7, using the go-rpio library
+
+Waits for button to be pressed before exit.
+
+Connect a button between pin 22 and some GND pin.
+
+*/
+
+package main
+
+import (
+	"fmt"
+	"time"
+	"os"
+	"github.com/stianeikeland/go-rpio"
+)
+
+var (
+	// Use mcu pin 22, corresponds to GPIO 3 on the pi
+	pin = rpio.Pin(22)
+)
+
+func main() {
+	// Open and map memory to access gpio, check for errors
+	if err := rpio.Open(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	// Unmap gpio memory when done
+	defer rpio.Close()
+
+	pin.Input()
+	pin.PullUp()
+	pin.Detect(rpio.FallEdge) // enable falling edge event detection
+
+	fmt.Println("press a button")
+
+	for {
+		if pin.EdgeDetected() { // check if event occured
+			fmt.Println("button pressed less than a second ago")
+			break
+		}
+		time.Sleep(time.Second)
+	}
+	pin.Detect(rpio.NoEdge) // disable edge event detection
+}