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Merge pull request #22 from Drahoslav7/feature/edge-event
Edge detection, closes #21
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| /* | ||
| An example of edge event handling by @Drahoslav7, using the go-rpio library | ||
| Waits for button to be pressed twice before exit. | ||
| Connect a button between pin 22 and some GND pin. | ||
| */ | ||
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| package main | ||
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| import ( | ||
| "fmt" | ||
| "os" | ||
| "time" | ||
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| "github.com/stianeikeland/go-rpio" | ||
| ) | ||
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| var ( | ||
| // Use mcu pin 22, corresponds to GPIO 3 on the pi | ||
| pin = rpio.Pin(22) | ||
| ) | ||
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| 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() | ||
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| pin.Input() | ||
| pin.PullUp() | ||
| pin.Detect(rpio.FallEdge) // enable falling edge event detection | ||
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| fmt.Println("press a button") | ||
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| for i := 0; i < 2; { | ||
| if pin.EdgeDetected() { // check if event occured | ||
| fmt.Println("button pressed") | ||
| i++ | ||
| } | ||
| time.Sleep(time.Second / 2) | ||
| } | ||
| pin.Detect(rpio.NoEdge) // disable edge event detection | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| package rpio | ||
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| import ( | ||
| "os" | ||
| "testing" | ||
| "time" | ||
| ) | ||
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| func TestMain(m *testing.M) { | ||
| println("Note: bcm pins 2 and 3 has to be directly connected") | ||
| if err := Open(); err != nil { | ||
| panic(err) | ||
| } | ||
| defer Close() | ||
| os.Exit(m.Run()) | ||
| } | ||
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| func TestEvent(t *testing.T) { | ||
| src := Pin(3) | ||
| src.Mode(Output) | ||
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| pin := Pin(2) | ||
| pin.Mode(Input) | ||
| pin.PullDown() | ||
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| t.Run("rising edge", func(t *testing.T) { | ||
| pin.Detect(RiseEdge) | ||
| src.Low() | ||
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| for i := 0; ; i++ { | ||
| src.High() | ||
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| time.Sleep(time.Second / 10) | ||
| if pin.EdgeDetected() { | ||
| t.Log("edge rised") | ||
| } else { | ||
| t.Errorf("Rise event should be detected") | ||
| } | ||
| if i == 5 { | ||
| break | ||
| } | ||
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| src.Low() | ||
| } | ||
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| time.Sleep(time.Second / 10) | ||
| if pin.EdgeDetected() { | ||
| t.Error("Rise should not be detected, no change since last call") | ||
| } | ||
| pin.Detect(NoEdge) | ||
| src.High() | ||
| if pin.EdgeDetected() { | ||
| t.Error("Rise should not be detected, events disabled") | ||
| } | ||
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| }) | ||
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| t.Run("falling edge", func(t *testing.T) { | ||
| pin.Detect(FallEdge) | ||
| src.High() | ||
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| for i := 0; ; i++ { | ||
| src.Low() | ||
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| time.Sleep(time.Second / 10) | ||
| if pin.EdgeDetected() { | ||
| t.Log("edge fallen") | ||
| } else { | ||
| t.Errorf("Fall event should be detected") | ||
| } | ||
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| if i == 5 { | ||
| break | ||
| } | ||
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| src.High() | ||
| } | ||
| time.Sleep(time.Second / 10) | ||
| if pin.EdgeDetected() { | ||
| t.Error("Fall should not be detected, no change since last call") | ||
| } | ||
| pin.Detect(NoEdge) | ||
| src.Low() | ||
| if pin.EdgeDetected() { | ||
| t.Error("Fall should not be detected, events disabled") | ||
| } | ||
| }) | ||
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| t.Run("both edges", func(t *testing.T) { | ||
| pin.Detect(AnyEdge) | ||
| src.Low() | ||
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| for i := 0; i < 5; i++ { | ||
| src.High() | ||
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| if pin.EdgeDetected() { | ||
| t.Log("edge detected") | ||
| } else { | ||
| t.Errorf("Rise event shoud be detected") | ||
| } | ||
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| src.Low() | ||
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| if pin.EdgeDetected() { | ||
| t.Log("edge detected") | ||
| } else { | ||
| t.Errorf("Fall edge should be detected") | ||
| } | ||
| } | ||
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| pin.Detect(NoEdge) | ||
| src.High() | ||
| src.Low() | ||
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| if pin.EdgeDetected() { | ||
| t.Errorf("No edge should be detected, events disabled") | ||
| } | ||
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| }) | ||
| } |