go-rpio/examples/event/event.go
2018-06-04 17:14:12 +02:00

49 lines
883 B
Go

/*
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
}