Last-modified: 2016-04-09 (土) 22:58:16
Raspberry Pi/タクトスイッチでトグル動作

概要 †

Raspberry Pi2のGPIOで、タクトスイッチ（トグル動作）を使ってみます。
Raspberry Pi/タクトスイッチのソースを変更しただけです。

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配線 †

000024.png
000001.jpg
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手順 †

  1. vi app.cpp
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    #include <iostream>
#include <stdexcept>
#include <thread>
#include <chrono>
#include <wiringPi.h>
 
using namespace std;
 
namespace
{
    constexpr int InPin = 24;
    constexpr int OutPin = 25;
    constexpr double DebounceMilliSec = 200.0;
    
    /**
	 * @brief 信号の状態
	 */
    enum class State : int
    {
        Low = 0,
        High = 1
    };
};
 
/**
 * @brief タクトスイッチを押すごとにLEDの点灯/消灯を切り替え 
 * 
 * @return 常に0
 */
int main()
{
    try
    {
        if (wiringPiSetupGpio() == -1)
        {
            throw runtime_error("Failed to wiringPiSetupGpio");
        }
        pinMode(InPin, INPUT);
        pinMode(OutPin, OUTPUT);
 
        // 割り込み
        // INT_EDGE_FALLING: High->Low
        // INT_EDGE_RISING: Low->High
        // INT_EDGE_BOTH: 両方
        wiringPiISR(InPin, INT_EDGE_RISING, [](){
            static State lastState = State::Low;
            static chrono::high_resolution_clock::time_point lastTime;
 
            // ノイズ対策
            const auto currentTime = chrono::high_resolution_clock::now();
            const auto duration = chrono::duration_cast<chrono::nanoseconds>(currentTime - lastTime).count();
            const double durationMilliSec = duration / 1000000.0;
            if (DebounceMilliSec > durationMilliSec)
            {
                cout << "skip\n";
            }
            else
            {
                cout << "run:" << durationMilliSec << "ms\n";
                lastState = (lastState == State::Low)? State::High: State::Low;
                digitalWrite(OutPin, static_cast<int>(lastState));
                lastTime = currentTime;
            }
        });
 
        int i = 0;
        cin >> i;
        cout << "exit...\n";
    }
    catch (exception& e)
    {
        cerr << e.what() << "\n";
    }
    catch (...)
    {
        cerr << "Unknown exception!\n";
    }
    return 0;
}
  2. vi Makefile
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    app: app.cpp
    g++ app.cpp -O2 -Wall -Wextra -std=gnu++11 -lwiringPi -oapp
clean:
    rm -f *.o app
  3. ビルド/実行
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    make
sudo ./app
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検証時の環境 †