7waySwitch/SHButtonMatrix.h at main · KyleMatheson/7waySwitch · GitHub

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#ifndef __SHBUTTONMATRIX_H__
#define __SHBUTTONMATRIX_H__

#include <Arduino.h>
#include "SHDebouncer.h"

typedef void(*SHButtonMatrixChanged) (int, byte);

class SHButtonMatrix {

private:

	FastDigitalPin button;
	uint8_t buttonState;
	int lastPressedButton;
	unsigned long buttonLastStateChanged;

	SHButtonMatrixChanged shButtonChangedCallback;
	SHDebouncer debouncer;

	byte rowCount;
	byte colCount;
	byte * colPins;
	byte * rowPins;
public:

	void begin(byte cols, byte rows, byte * col, byte * row, SHButtonMatrixChanged changedcallback) {

		debouncer.begin(10);
		rowCount = rows;
		colCount = cols;
		colPins = col;
		rowPins = row;

		for (int x = 0; x < rowCount; x++) {

			pinMode(rowPins[x], INPUT);
		}

		for (int x = 0; x < colCount; x++) {

			pinMode(colPins[x], INPUT_PULLUP);
		}

		shButtonChangedCallback = changedcallback;
	}

	void read() {
		if (debouncer.Debounce()) {
			int pressedButton = -1;
			if (buttonLastStateChanged - millis() > 50) {
				for (int colIndex = 0; colIndex < colCount; colIndex++) {

					byte curCol = colPins[colIndex];
					pinMode(curCol, OUTPUT);
					digitalWrite(curCol, LOW);

					for (int rowIndex = 0; rowIndex < rowCount; rowIndex++) {
						byte rowCol = rowPins[rowIndex];
						pinMode(rowCol, INPUT_PULLUP);
						if (digitalRead(rowCol) == LOW) {
							pressedButton = rowIndex * colCount + colIndex + 1;
						}
						//pinMode(rowCol, INPUT);
					}

					pinMode(curCol, INPUT);
				}

				if (pressedButton != lastPressedButton) {

					if (lastPressedButton != -1) {
						shButtonChangedCallback(lastPressedButton, 0);
					}
					if (pressedButton != -1) {
						shButtonChangedCallback(pressedButton, 1);
					}
					buttonLastStateChanged = millis();
				}

				lastPressedButton = pressedButton;
			}
			//String s = String(lastPressedButton);
			//FlowSerialDebugPrintLn(s);
		}

		return;

	}
};

#endif