initial commit

1 files changed, 151 insertions, 0 deletions

diff --git a/12key-arduino/12key-arduino.ino b/12key-arduino/12key-arduino.ino
new file mode 100644
index 0000000..dc1210f
--- /dev/null
+++ b/12key-arduino/12key-arduino.ino
@@ -0,0 +1,151 @@
+#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;
+	}
+}