text: /*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2019 Scott Shawcroft
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #include "shared-module/gamepadshift/__init__.h"
  
  #include "py/mpstate.h"
  #include "shared-bindings/gamepadshift/GamePadShift.h"
  
  void gamepadshift_tick(void) {
      void *singleton = MP_STATE_VM(gamepad_singleton);
      if (singleton == NULL || !MP_OBJ_IS_TYPE(MP_OBJ_FROM_PTR(singleton), &gamepadshift_type)) {
          return;
      }
  
      gamepadshift_obj_t *self = MP_OBJ_TO_PTR(singleton);
      uint8_t current = 0;
      uint8_t bit = 1;
      common_hal_digitalio_digitalinout_set_value(self->latch_pin, 1);
      for (int i = 0; i < 8; ++i) {
          common_hal_digitalio_digitalinout_set_value(self->clock_pin, 0);
          if (common_hal_digitalio_digitalinout_get_value(self->data_pin)) {
              current |= bit;
          }
          common_hal_digitalio_digitalinout_set_value(self->clock_pin, 1);
          bit <<= 1;
      }
      common_hal_digitalio_digitalinout_set_value(self->latch_pin, 0);
      self->pressed |= self->last & current;
      self->last = current;
  }
  
  void gamepadshift_reset(void) {
      MP_STATE_VM(gamepad_singleton) = NULL;
  }
  