commit 330a26fb73796c9ad02c247d5554d82b3a0525bf
Author: Daniel Ledda <ledda@cip.ifi.lmu.de>
Date:   Sat Oct 31 12:37:02 2020 +0100

    first commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..723ef36
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea
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diff --git a/main.go b/main.go
new file mode 100644
index 0000000..884b6bd
--- /dev/null
+++ b/main.go
@@ -0,0 +1,50 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+	"time"
+
+	"github.com/warthog618/gpiod"
+	"github.com/warthog618/gpiod/device/rpi"
+)
+
+// Watches GPIO 4 (Raspberry Pi J8-7) and reports when it changes state.
+func main() {
+	c, err := gpiod.NewChip("gpiochip0")
+	if err != nil {
+		panic(err)
+	}
+	defer c.Close()
+
+	offset := rpi.J8p7
+	l, err := c.RequestLine(offset,
+		gpiod.WithPullUp,
+		gpiod.WithBothEdges(func(evt gpiod.LineEvent) {
+			t := time.Now()
+			edge := "rising"
+			if evt.Type == gpiod.LineEventFallingEdge {
+				edge = "falling"
+			}
+			fmt.Printf("event:%3d %-7s %s (%s)\n",
+				evt.Offset,
+				edge,
+				t.Format(time.RFC3339Nano),
+				evt.Timestamp)
+		}))
+	if err != nil {
+		fmt.Printf("RequestLine returned error: %s\n", err)
+		if err == syscall.Errno(22) {
+			fmt.Println("Note that the WithPullUp option requires kernel V5.5 or later - check your kernel version.")
+		}
+		os.Exit(1)
+	}
+	defer l.Close()
+
+	// In a real application the main thread would do something useful.
+	// But we'll just run for a minute then exit.
+	fmt.Printf("Watching Pin %d...\n", offset)
+	time.Sleep(time.Minute)
+	fmt.Println("exiting...")
+}
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