Button box for Arduino WIP

button_box.ido

#include <Joystick.h>
#include <Keypad.h>

#define ENABLE_PULLUPS
#define NUMROTARIES 4 // Number of rotary encoders
#define NUMBUTTONS 18 // Number of buttons
#define NUMROWS 6     // Number of rows in matrix
#define NUMCOLS 3     // Number of columns in matrix

byte row_pins[NUMROWS] = {6, 7, 8, 9, 10, 16};
byte col_pins[NUMCOLS] = {18, 19, 20};

byte buttons[NUMROWS][NUMCOLS] = {};

struct rotariesdef {
  byte pin1;
  byte pin2;
  int ccwchar;
  int cwchar;
  volatile unsigned char state;
};

rotariesdef rotaries[NUMROTARIES] {};

// Counter-clockwise direction
#define DIR_CCW 0x10
// Clockwise direction
#define DIR_CW 0x20
// Rotary start
#define R_START 0x0

#ifdef HALF_STEP
// Rotary counter-clockwise begin
#define R_CCW_BEGIN 0x1
// Rotary clockwise begin
#define R_CW_BEGIN 0x2
// Rotary start...?
#define R_START_M 0x3
// Rotary clockwise begin...?
#define R_CW_BEGIN_M 0x4
// Rotary counter-clockwise begin...?
#define R_CCW_BEGIN_M 0x5

const unsigned char ttable[6][4] = {};

Keypad button_box = Keypad(
  makeKeymap(buttons),
  row_pins,
  col_pins,
  NUMROWS,
  NUMCOLS
);

Joystick_ Joystick(
  JOYSTICK_DEFAULT_REPORT_ID,
  JOYSTICK_TYPE_JOYSTICK, 
  32, 
  0,
  false, 
  false, 
  false,
  false,
  false,
  false,
  false,
  false,
  false,
  false,
  false
);

void setup() {
  Joystick.begin();
  rotary_init();
}

void loop() {
  check_all_encoders();
  check_all_buttons();
}

void rotary_init(void) {
  for (int i=0; i<NUMROTARIES; i++) {
    pinMode(rotaries[i].pin1, INPUT);
    pinMode(rotaries[i].pin2, INPUT);
    #ifdef ENABLE_PULLUPS
      digitalWrite(rotaries[i].pin1, HIGH);
      digitalWrite(rotaries[i].pin2, HIGH);
    #endif
  }
}

void check_all_buttons(void) {
  if (button_box.getKeys()) {
    for (int i=0; i<LIST_MAX; i++) {  
      if (button_box.key[i].stateChanged) {
        switch (button_box.key[i].kstate) {
          case PRESSED:
          case HOLD:
            Serial.print("Pressed");
            Joystick.setButton(button_box.key[i].kchar, 1);
            break;
          case RELEASED:
          case IDLE:
            Serial.print("Released");
            Joystick.setButton(button_box.key[i].kchar, 0);
            break;
        }
      }
    }
  }
}

// Process the rotary state to establish what direction it's been turned
unsigned char rotary_process(int r) {
  unsigned char pinstate = (digitalRead(rotaries[r].pin2) << 1) | digitalRead(rotaries[r].pin1);
  rotaries[r].state = ttable[rotaries[r].state & 0xf][pinstate];
  return (rotaries[r].state & 0x30);
}

// Process the rotary position, and update the joystick
void check_all_encoders(void) {
  for (int i=0; i<NUMROTARIES; i++) {
    unsigned char result = rotary_process(i);

    // Process a counter-clockwise rotation
    if (result == DIR_CCW) {
      Joystick.setButton(rotaries[i].ccwchar, 1);
      delay(50);
      Joystick.setButton(rotaries[i].ccwchar, 0);
    }

    // Process a clockwise rotation
    if (result == DIR_CW) {
      Joystick.setButton(rotaries[i].cwchar, 1);
      delay(50);
      Joystick.setButton(rotaries[i].cwchar, 0);
    }
  }
}