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78 lines
2.1 KiB
Go
78 lines
2.1 KiB
Go
// Copyright 2017 The Periph Authors. All rights reserved.
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// Use of this source code is governed under the Apache License, Version 2.0
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// that can be found in the LICENSE file.
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package cap1xxx_test
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import (
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"fmt"
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"log"
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"periph.io/x/periph/conn/gpio"
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"periph.io/x/periph/conn/gpio/gpioreg"
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"periph.io/x/periph/conn/i2c/i2creg"
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"periph.io/x/periph/devices/cap1xxx"
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)
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func Example() {
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// Open the I²C bus to which the cap1188 is connected.
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i2cBus, err := i2creg.Open("")
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if err != nil {
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log.Fatal(err)
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}
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defer i2cBus.Close()
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// We need to set an alert ping that will let us know when a touch event
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// occurs. The alert pin is the pin connected to the IRQ/interrupt pin.
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alertPin := gpioreg.ByName("GPIO25")
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if alertPin == nil {
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log.Fatal("invalid alert GPIO pin number")
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}
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// We set the alert pin to monitor for interrupts.
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if err := alertPin.In(gpio.PullUp, gpio.BothEdges); err != nil {
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log.Fatalf("Can't monitor the alert pin")
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}
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// Optionally but highly recommended, we can also set a reset pin to
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// start/leave things in a clean state.
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resetPin := gpioreg.ByName("GPIO21")
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if resetPin == nil {
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log.Fatal("invalid reset GPIO pin number")
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}
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// We will configure the cap1188 by setting some options, we can start by the
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// defaults.
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opts := cap1xxx.DefaultOpts
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opts.AlertPin = alertPin
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opts.ResetPin = resetPin
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// Open the device so we can detect touch events.
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dev, err := cap1xxx.NewI2C(i2cBus, &opts)
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if err != nil {
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log.Fatalf("couldn't open cap1xxx: %v", err)
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}
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fmt.Println("Monitoring for touch events")
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maxTouches := 42 // Stop the program after 42 touches.
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for maxTouches > 0 {
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if alertPin.WaitForEdge(-1) {
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maxTouches--
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var statuses [8]cap1xxx.TouchStatus
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if err := dev.InputStatus(statuses[:]); err != nil {
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fmt.Printf("Error reading inputs: %v\n", err)
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continue
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}
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// print the status of each sensor
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for i, st := range statuses {
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fmt.Printf("#%d: %s\t", i, st)
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}
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fmt.Println()
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// we need to clear the interrupt so it can be triggered again
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if err := dev.ClearInterrupt(); err != nil {
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fmt.Println(err, "while clearing the interrupt")
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}
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}
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}
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fmt.Print("\n")
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}
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