44 lines
857 B
Go
44 lines
857 B
Go
package main
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import (
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"fmt"
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"os"
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"os/signal"
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"syscall"
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"time"
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"github.com/warthog618/gpio"
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)
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// Watches GPIO 4 (J8 7) and reports when it changes state.
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func main() {
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err := gpio.Open()
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if err != nil {
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panic(err)
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}
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defer gpio.Close()
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pin := gpio.NewPin(gpio.J8p7)
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pin.Input()
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pin.PullUp()
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// capture exit signals to ensure resources are released on exit.
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quit := make(chan os.Signal, 1)
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signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
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defer signal.Stop(quit)
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err = pin.Watch(gpio.EdgeBoth, func(pin *gpio.Pin) {
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fmt.Printf("Pin 4 is %v", pin.Read())
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})
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if err != nil {
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panic(err)
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}
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defer pin.Unwatch()
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// In a real application the main thread would do something useful here.
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// But we'll just run for a minute then exit.
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fmt.Println("Watching Pin 4...")
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select {
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case <-time.After(time.Minute):
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case <-quit:
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}
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} |