Added button matrix basic code

main.ino

@@ -0,0 +1,42 @@
+#include <Joystick.h>
+
+Joystick_ Joystick;
+
+const byte BR[3] = {1,2,3}; // Button array rows
+const byte BC[3] = {4,5,6}; // Button array columns
+byte keys[3][3];
+
+const byte REA[6] = {7,8,9,10,11,12}; // Rotary encoders pin A
+const byte REB[6] = {13,14,15,16,17,18}; // Rotary encoders pin B
+
+void setup() {
+	for(int i=0; i<6; i++) {
+		pinMode(REl[i], INPUT_PULLUP);
+		pinMode(REr[i], INPUT_PULLUP);
+	}
+	for(int i=0; i<6; i++) {
+		pinMode(BR[i], INPUT);
+		pinMode(BC[i], INPUT_PULLUP);
+	}
+	
+	Joystick.begin()
+}
+
+void readMatrix() {
+	for (int i=0; i<3; i++) {
+		pinMode(BC[i], OUTPUT);
+		digitalWrite(BC[i], LOW);
+		
+		for (int j=0; j<3; j++) {
+			pinMode(BR[j], INPUT_PULLUP);
+			keys[i][j] = digitalRead(BR[j]);
+			pinMode(BR[j], INPUT);
+		}
+		
+		pinMode(BC[i], INPUT);
+	}
+}
+
+void loop() {
+	readMatrix();
+}