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#include <Arduino.h>
#include "pins.h"
class Button {
protected:
unsigned int m_mask;
unsigned int m_debounceTime;
bool m_debouncing;
unsigned long m_debounceEnd;
bool m_pressed;
void startDebounce() {
m_debouncing = true;
m_debounceEnd = millis() + m_debounceTime;
}
public:
static unsigned int state;
Button(unsigned int index, unsigned int debounceTime=4) {
m_mask = 1 << index;
m_debounceTime = debounceTime;
m_debouncing = false;
m_pressed = false;
}
void update(unsigned int pins) {
if (m_debouncing) {
if (millis() > m_debounceEnd) {
/* done debouncing, continue */
m_debouncing = false;
}
else {
/* still debouncing, ignore changes */
return;
}
}
if ((m_mask & pins)) {
/* pressed */
if (m_pressed) {
/* already marked */
}
else {
/* update state */
m_pressed = true;
state = state | m_mask;
startDebounce();
}
}
else {
/* released */
if (!m_pressed) {
/* already marked, ignore */
}
else {
/* update state */
m_pressed = false;
state = state & ~m_mask;
startDebounce();
}
}
}
};
unsigned int Button::state = 0;
Button buttons[] = {
Button(0),
Button(1),
Button(2),
Button(3),
Button(4),
Button(5),
Button(6),
Button(7),
Button(8),
Button(9),
Button(10),
Button(11),
};
/* pin bitmask order: xxxx 1234 5678 9*0# */
unsigned int ReadPins() {
byte col1 = 1 - digitalRead(COL_1);
byte col2 = 1 - digitalRead(COL_2);
byte col3 = 1 - digitalRead(COL_3);
byte row1 = 1 - digitalRead(ROW_1);
byte row2 = 1 - digitalRead(ROW_2);
byte row3 = 1 - digitalRead(ROW_3);
byte row4 = 1 - digitalRead(ROW_4);
#define BUILD_ROW(row, c1, c2, c3) \
( ((row & c1) << 2) | ((row & c2) << 1) | (row & c3) )
byte row1_buttons = BUILD_ROW(row1, col1, col2, col3);
byte row2_buttons = BUILD_ROW(row2, col1, col2, col3);
byte row3_buttons = BUILD_ROW(row3, col1, col2, col3);
byte row4_buttons = BUILD_ROW(row4, col1, col2, col3);
return 0 |
(row1_buttons << 9) |
(row2_buttons << 6) |
(row3_buttons << 3) |
(row4_buttons << 0);
}
void setup() {
pinMode(COL_1, INPUT_PULLUP);
pinMode(COL_2, INPUT_PULLUP);
pinMode(COL_3, INPUT_PULLUP);
pinMode(ROW_1, INPUT_PULLUP);
pinMode(ROW_2, INPUT_PULLUP);
pinMode(ROW_3, INPUT_PULLUP);
pinMode(ROW_4, INPUT_PULLUP);
Serial.begin(115200);
}
void PrintPin(unsigned int pins, int index, const char *msg) {
if (pins & (1 << index)) {
Serial.print(msg);
}
}
void loop() {
unsigned int pins = ReadPins();
for (int i=0; i<12; i++) {
buttons[i].update(pins);
}
if (Button::state != 0) {
Serial.print("buttons: ");
PrintPin(Button::state, 11, "1");
PrintPin(Button::state, 10, "2");
PrintPin(Button::state, 9, "3");
PrintPin(Button::state, 8, "4");
PrintPin(Button::state, 7, "5");
PrintPin(Button::state, 6, "6");
PrintPin(Button::state, 5, "7");
PrintPin(Button::state, 4, "8");
PrintPin(Button::state, 3, "9");
PrintPin(Button::state, 2, "*");
PrintPin(Button::state, 1, "0");
PrintPin(Button::state, 0, "#");
Serial.println();
Button::state = 0;
}
}
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