477 lines
15 KiB
C++
477 lines
15 KiB
C++
#include <Wire.h>
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#define TRACKBALL_ADDR 0x0A
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#define TRACKBALL_REG_LEFT 0x04
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// using my own masks here since the inbuilt ones conflict with arrow keys etc.
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#define MASK_SHIFT 0x100
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#define MASK_ALTGR 0x200
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const byte PIN_A = 33;
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const byte PIN_B = 32;
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const byte PIN_C = 31;
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const byte PIN_D = 24;
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const byte PIN_E = 25;
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const byte PIN_F = 26;
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const byte PIN_MOUSE_UL = 27;
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const byte PIN_MOUSE_UR = 30;
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const byte PIN_MOUSE_DL = 28;
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const byte PIN_MOUSE_DR = 29;
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const byte PIN_LED1 = 6;
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const byte PIN_LED2 = 1;
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const byte PIN_LED3 = 3;
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const byte PIN_BALL_SDA = 18;
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const byte PIN_BALL_SCL = 19;
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enum Button { A, B, C, D, E, F, MouseUL, MouseUR, MouseDL, MouseDR };
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const int button_pins[10] = {
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PIN_A, PIN_B, PIN_C, PIN_D, PIN_E, PIN_F,
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PIN_MOUSE_UL, PIN_MOUSE_UR, PIN_MOUSE_DL, PIN_MOUSE_DR
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};
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const int debounce_time = 50;
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int button_timers[10] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
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// different actions that the keyboard can take
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// - press (and release) a key
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// - toggle a modifier
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enum ActionType { PressKey, ToggleModifier };
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const int button_characters[6] = { KEY_A, KEY_B, KEY_C, KEY_D, KEY_E, KEY_F };
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const int button_characters_symbol[6] = {
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KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, KEY_6
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};
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/*
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backspace, space (keep those two first since they overlap with the rest )
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g, k, o, s, w, native
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*/
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const byte chords[8] = { 7, 56, 24, 48, 3, 6, 40, 5 };
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// buttons that can be combined with a chord for a keypress
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const byte chord_buttons[24] = {
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Button::D, Button::E, Button::F,
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Button::A, Button::B, Button::C,
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Button::A, Button::B, Button::C,
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Button::A, Button::B, Button::C,
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Button::D, Button::E, Button::F,
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Button::D, Button::E, Button::F,
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Button::A, Button::B, Button::C,
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Button::D, Button::E, Button::F,
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};
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// keypresses for chords in sets of 4
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// index 0 is the chord on its own, 1-3 correspond to chord_buttons
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const int chord_targets[32] = {
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KEY_BACKSPACE, KEY_LEFT, KEY_LEFT, KEY_HOME,
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KEY_SPACE, KEY_RIGHT, KEY_RIGHT, KEY_END,
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KEY_G, KEY_H, KEY_I, KEY_J,
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KEY_K, KEY_L, KEY_M, KEY_N,
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KEY_O, KEY_P, KEY_Q, KEY_R,
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KEY_S, KEY_T, KEY_U, KEY_V,
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KEY_W, KEY_X, KEY_Y, KEY_Z,
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0, 0, 0, 0
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};
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const int chord_targets_symbol[32] = {
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KEY_BACKSPACE, KEY_LEFT, KEY_LEFT, KEY_HOME,
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KEY_SPACE, KEY_RIGHT, KEY_RIGHT, KEY_END,
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KEY_0, KEY_7, KEY_8, KEY_9,
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// # @ ½ &
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KEY_BACKSLASH, KEY_QUOTE + MASK_SHIFT, KEY_5 + MASK_ALTGR, KEY_7 + MASK_SHIFT,
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// + % = ^
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KEY_EQUAL + MASK_SHIFT, KEY_5 + MASK_SHIFT, KEY_EQUAL, KEY_6 + MASK_SHIFT,
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// * $ € £
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KEY_8 + MASK_SHIFT, KEY_4 + MASK_SHIFT, KEY_4 + MASK_ALTGR, KEY_3 + MASK_SHIFT,
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// ( [ < {
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KEY_9 + MASK_SHIFT, KEY_LEFT_BRACE, KEY_COMMA + MASK_SHIFT, KEY_LEFT_BRACE + MASK_SHIFT,
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// ) ] > }
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KEY_0 + MASK_SHIFT, KEY_RIGHT_BRACE, KEY_PERIOD + MASK_SHIFT, KEY_RIGHT_BRACE + MASK_SHIFT,
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};
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/*
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dash, backslash, slash, apostrophe, comma, exclamation point, question mark,
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period, up, down, page up, page down, shift, symbol shift, switch keyset,
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escape, control, alt, delete, insert, tab, enter
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*/
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// TODO: add the middle specials for function keys instead of the weird symbols
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const byte specials[22] = {
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17, 51, 30, 10, 20, 12, 33, 34, 9, 36, 27,
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54, 18, 45, 63, 31, 47, 55, 62, 43, 61, 59
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};
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enum Modifier { Shift, SymbolShift, Keyset, Control, Alt, Gui };
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const int special_action_targets[22] = {
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// - \ / '
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KEY_MINUS, KEY_MINUS + MASK_ALTGR, KEY_SLASH, KEY_QUOTE,
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// , ! ? .
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KEY_COMMA, KEY_1 + MASK_SHIFT, KEY_SLASH + MASK_SHIFT, KEY_PERIOD,
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KEY_UP, KEY_DOWN, KEY_PAGE_UP, KEY_PAGE_DOWN,
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Modifier::Shift, Modifier::SymbolShift, Modifier::Keyset,
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KEY_ESC, Modifier::Control, Modifier::Alt, KEY_DELETE, Modifier::Gui,
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KEY_TAB, KEY_ENTER
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};
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const int special_action_targets_symbol[22] = {
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// _ ` ´ "
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KEY_MINUS + MASK_SHIFT, KEY_TILDE, KEY_SEMICOLON + MASK_ALTGR, KEY_2 + MASK_SHIFT,
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// ; | ~ :
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KEY_SEMICOLON, KEY_TILDE + MASK_ALTGR, KEY_BACKSLASH + MASK_SHIFT, KEY_SEMICOLON + MASK_SHIFT,
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0, 0, 0, 0,
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0, 0, 0,
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0, 0, 0, 0, 0,
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0, 0
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};
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const byte special_action_target_types[22] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0
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};
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byte key_pressed = 0;
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byte key_pressed_total = 0;
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bool chord_used = false;
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bool chorded_pressed = false;
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bool mod_shift = false;
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bool mod_shift_lock = false;
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bool mod_symbol = false;
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bool mod_symbol_lock = false;
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bool mod_control = false;
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bool mod_alt = false;
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bool mod_altgr = false;
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bool mod_gui = false;
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IntervalTimer trackball_timer;
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volatile bool trackball_update = false;
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byte mouse_up = 0;
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byte mouse_down = 0;
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byte mouse_left = 0;
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byte mouse_right = 0;
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bool mouse_button = false;
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const int num_mouse_samples = 10;
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int current_mouse_sample = 0;
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int mouse_movement_sample = 0;
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float mouse_acceleration = 0.0f;
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const float mouse_accel_factor = 0.7f;
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const int mouse_scroll_sensitivity = 6;
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int mouse_scroll_dist = 0;
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bool mouse_middle_pressed = false;
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bool mouse_scrolled = false;
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void setup() {
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pinMode(PIN_A, INPUT_PULLUP);
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pinMode(PIN_B, INPUT_PULLUP);
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pinMode(PIN_C, INPUT_PULLUP);
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pinMode(PIN_D, INPUT_PULLUP);
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pinMode(PIN_E, INPUT_PULLUP);
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pinMode(PIN_F, INPUT_PULLUP);
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pinMode(PIN_MOUSE_UL, INPUT_PULLUP);
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pinMode(PIN_MOUSE_UR, INPUT_PULLUP);
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pinMode(PIN_MOUSE_DL, INPUT_PULLUP);
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pinMode(PIN_MOUSE_DR, INPUT_PULLUP);
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pinMode(PIN_LED1, OUTPUT);
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pinMode(PIN_LED2, OUTPUT);
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pinMode(PIN_LED3, OUTPUT);
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// poll trackball at 10kHz
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trackball_timer.begin(trackball_isr, 100);
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Wire.begin();
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}
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void loop() {
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/*
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BUTTONS
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*/
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for (byte b = 0; b < 10; b++) {
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// button is pressed
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if (!digitalRead(button_pins[b])) {
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// increment button timer if it's not full
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if (button_timers[b] < debounce_time)
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button_timers[b]++;
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else {
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// update pressed gkos keys
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if (b < 6) {
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key_pressed |= 1 << b;
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key_pressed_total |= 1 << b;
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}
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// update pressed mouse keys
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else {
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switch (b) {
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case Button::MouseUL:
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Mouse.press(MOUSE_LEFT);
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break;
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case Button::MouseUR:
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Mouse.press(MOUSE_RIGHT);
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break;
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case Button::MouseDL:
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case Button::MouseDR:
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mouse_middle_pressed = true;
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break;
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}
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}
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}
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}
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// button is released
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else {
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// if the button had been debounced, it counts as a press
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if (button_timers[b] >= debounce_time) {
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// gkos key released
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if (b < 6) {
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key_pressed &= ~(1 << b);
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// check if it completed a chord
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key_released(b);
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update_leds();
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if (key_pressed == 0) {
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key_pressed_total = 0;
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// clear flags
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chord_used = false;
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chorded_pressed = false;
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}
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}
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// mouse button released
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else {
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switch (b) {
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case Button::MouseUL:
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Mouse.release(MOUSE_LEFT);
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break;
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case Button::MouseUR:
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Mouse.release(MOUSE_RIGHT);
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break;
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case Button::MouseDL:
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case Button::MouseDR:
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if (!mouse_scrolled)
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Mouse.click(MOUSE_MIDDLE);
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mouse_middle_pressed = mouse_scrolled = false;
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mouse_scroll_dist = 0;
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break;
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}
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}
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}
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button_timers[b] = 0;
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}
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}
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/*
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TRACKBALL
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*/
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noInterrupts();
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if (trackball_update) {
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Wire.beginTransmission(TRACKBALL_ADDR);
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Wire.write(TRACKBALL_REG_LEFT);
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Wire.endTransmission();
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Wire.requestFrom(TRACKBALL_ADDR, 5);
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mouse_left = Wire.read();
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mouse_right = Wire.read();
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mouse_up = Wire.read();
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mouse_down = Wire.read();
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mouse_button = Wire.read();
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int mouse_x = mouse_right - mouse_left;
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int mouse_y = mouse_down - mouse_up;
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mouse_movement_sample += abs(mouse_x) + abs(mouse_y);
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current_mouse_sample++;
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if (current_mouse_sample > num_mouse_samples) {
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current_mouse_sample = 0;
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mouse_acceleration = 1.0f + mouse_movement_sample * mouse_accel_factor;
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mouse_movement_sample = 0;
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}
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if (mouse_middle_pressed) {
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mouse_scroll_dist += mouse_y;
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if (abs(mouse_scroll_dist) > mouse_scroll_sensitivity) {
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Mouse.scroll(mouse_scroll_dist % mouse_scroll_sensitivity);
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mouse_scroll_dist %= mouse_scroll_sensitivity;
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mouse_scrolled = true;
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}
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} else {
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Mouse.move(mouse_x * mouse_acceleration, mouse_y * mouse_acceleration);
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}
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trackball_update = false;
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}
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interrupts();
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}
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// returns true if a keypress was completed
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void key_released(byte key) {
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int target = 0;
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/*
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SPECIALS
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*/
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bool is_special = false;
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byte special = 0;
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for (byte b = 0; b < 22; b++) {
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if (key_pressed_total == specials[b]) {
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is_special = true;
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special = b;
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break;
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}
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}
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if (is_special && !chord_used) {
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// only register a special keypress when all keys have been released
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if (key_pressed != 0)
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return;
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target = special_action_targets[special];
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if (mod_shift || mod_shift_lock || mod_symbol || mod_symbol_lock) {
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if (special_action_targets_symbol[special] != 0)
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target = special_action_targets_symbol[special];
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}
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switch (special_action_target_types[special]) {
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case ActionType::PressKey:
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press_key(target);
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return;
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case ActionType::ToggleModifier:
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switch (target) {
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case Modifier::Shift:
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mod_symbol = mod_symbol_lock = false;
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if (mod_shift_lock) {
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mod_shift_lock = false;
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} else if (mod_shift) {
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mod_shift = false;
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mod_shift_lock = true;
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} else {
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mod_shift = true;
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}
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return;
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case Modifier::SymbolShift:
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mod_shift = mod_shift_lock = mod_symbol_lock = false;
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mod_symbol = !mod_symbol;
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return;
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case Modifier::Keyset:
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mod_shift = mod_shift_lock = mod_symbol = false;
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mod_symbol_lock = !mod_symbol_lock;
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return;
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case Modifier::Control:
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mod_control = !mod_control;
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return;
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case Modifier::Alt:
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mod_alt = !mod_alt;
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return;
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case Modifier::Gui:
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mod_gui = !mod_gui;
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return;
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}
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}
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return;
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}
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/*
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CHORDS
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*/
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bool is_chord = false;
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byte chord = 0;
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for (byte b = 0; b < 8; b++) {
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if ((key_pressed_total & chords[b]) == chords[b]) {
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is_chord = true;
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chord = b;
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chord_used = true;
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break;
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}
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}
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if (is_chord) {
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// chord on its own
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if (!chorded_pressed && key_pressed == 0 &&
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key_pressed_total == chords[chord]) {
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target = chord_targets[chord * 4];
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if (mod_symbol || mod_symbol_lock)
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target = chord_targets_symbol[chord * 4];
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press_key(target);
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return;
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}
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// keys that can be chorded with
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for (byte b = 0; b < 3; b++) {
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if (key == chord_buttons[chord * 3 + b]) {
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target = chord_targets[chord * 4 + 1 + b];
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if (mod_symbol || mod_symbol_lock)
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target = chord_targets_symbol[chord * 4 + 1 + b];
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// erase key from total so you can hold the chord down for
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// multiple chorded keypresses
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key_pressed_total &= ~(1 << key);
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chorded_pressed = true;
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press_key(target);
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return;
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}
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}
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return;
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}
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/*
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REGULAR KEYS
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*/
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// keypress
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if (mod_symbol || mod_symbol_lock)
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press_key(button_characters_symbol[key]);
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else
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press_key(button_characters[key]);
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return;
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}
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void press_key(int key) {
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// check if modifiers need to be forced
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if (key & MASK_SHIFT) {
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mod_shift = true;
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key &= ~(MASK_SHIFT);
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}
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if (key & MASK_ALTGR) {
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mod_altgr = true;
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key &= ~(MASK_ALTGR);
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}
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// modifiers
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if (mod_shift || mod_shift_lock)
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Keyboard.press(KEY_LEFT_SHIFT);
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if (mod_control)
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Keyboard.press(KEY_LEFT_CTRL);
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if (mod_alt)
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Keyboard.press(KEY_LEFT_ALT);
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if (mod_altgr)
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Keyboard.press(KEY_RIGHT_ALT);
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if (mod_gui)
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Keyboard.press(KEY_LEFT_GUI);
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// keypress
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Keyboard.press(key);
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Keyboard.release(key);
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// release modifiers
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if (mod_shift || mod_shift_lock)
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Keyboard.release(KEY_LEFT_SHIFT);
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if (mod_control)
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Keyboard.release(KEY_LEFT_CTRL);
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if (mod_alt)
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Keyboard.release(KEY_LEFT_ALT);
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if (mod_altgr)
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Keyboard.release(KEY_RIGHT_ALT);
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if (mod_gui)
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Keyboard.release(KEY_LEFT_GUI);
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// clear temporary modifiers
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mod_shift = mod_symbol = mod_control = mod_alt = mod_altgr = mod_gui = false;
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}
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void update_leds() {
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digitalWrite(PIN_LED1, mod_shift || mod_shift_lock);
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digitalWrite(PIN_LED2, mod_symbol || mod_symbol_lock);
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digitalWrite(PIN_LED3, mod_control || mod_alt || mod_gui);
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}
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int sign(int num) {
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if (num >= 0) return 1;
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return -1;
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}
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void trackball_isr() {
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trackball_update = true;
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}
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