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