Method update

Drivers/TCA8418/Source/Tca8418.cpp:121–162

}

bool Tca8418::update() {
    last_update_micros = this_update_micros;
    uint8_t key_down, key_event, key_row, key_col;

    key_event = get_key_event();
    // TODO: read gpio R7/R6 status? 0x14 bits 7&6
    // read(0x14, &new_keycode)

    // TODO: use tick function to get an update delta time
    this_update_micros = 0;
    delta_micros = this_update_micros - last_update_micros;

    if (key_event > 0) {
        key_down = (key_event & 0x80);
        uint16_t buffer = key_event;
        buffer &= 0x7F;
        buffer--;
        key_row = buffer / 10;
        key_col = buffer % 10;

        // always clear the released list
        clear_released_list();

        if (key_down) {
            add_pressed_key(key_row, key_col);
            // TODO reject ghosts (assume multiple key presses with the same hold time are ghosts.)

        } else {
            add_released_key(key_row, key_col);
            remove_pressed_key(key_row, key_col);
        }

        return true;
    }

    // Increment hold times for pressed keys
    for (int i = 0; i < pressed_key_count; i++) {
        pressed_list[i].hold_time += delta_micros;
    }

    return false;
}


void Tca8418::add_pressed_key(uint8_t row, uint8_t col) {