text: /*
      MIT License
  
      Copyright (c) 2018-2021, Alexey Dynda
  
      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 "core.h"
  
  #ifdef SDL_EMULATION
  #include "sdl_core.h"
  #endif
  ///////////////////////////////////////////////////////////////////////////////
  ////// NANO ENGINE INPUTS CLASS ///////////////////////////////////////////////
  ///////////////////////////////////////////////////////////////////////////////
  
  /** Callback to call if buttons state needs to be updated */
  TNanoEngineGetButtons NanoEngineInputs::m_onButtons = nullptr;
  
  uint8_t NanoEngineInputs::s_ky40_clk;
  uint8_t NanoEngineInputs::s_ky40_dt;
  uint8_t NanoEngineInputs::s_ky40_sw;
  
  
  bool NanoEngineInputs::pressed(uint8_t buttons)
  {
      return (m_onButtons() & buttons) == buttons;
  }
  
  bool NanoEngineInputs::notPressed(uint8_t buttons)
  {
      return (m_onButtons() & buttons) == 0;
  }
  
  void NanoEngineInputs::connectCustomKeys(TNanoEngineGetButtons handler)
  {
      m_onButtons = handler;
  }
  
  void NanoEngineInputs::connectArduboyKeys()
  {
      m_onButtons = arduboyButtons;
  }
  
  uint8_t NanoEngineInputs::s_zkeypadPin;
  
  uint8_t NanoEngineInputs::zkeypadButtons()
  {
      int buttonValue = analogRead(s_zkeypadPin);
      if (buttonValue < 100) return BUTTON_RIGHT;
      if (buttonValue < 200) return BUTTON_UP;
      if (buttonValue < 400) return BUTTON_DOWN;
      if (buttonValue < 600) return BUTTON_LEFT;
      if (buttonValue < 800) return BUTTON_A;
      /** Z-keypad has only 5 analog buttons: no button B */
      return BUTTON_NONE;
  }
  
  void NanoEngineInputs::connectZKeypad(uint8_t analogPin)
  {
      NanoEngineInputs::s_zkeypadPin = analogPin;
      m_onButtons = zkeypadButtons;
  }
  
  uint8_t NanoEngineInputs::arduboyButtons()
  {
      uint8_t buttons;
      /* Arduboy buttons available only for Atmega32U4 platform */
      #if defined(__AVR_ATmega32U4__)
      // down, up, left right
      buttons = (((~PINF) & 0B11110000)>>4);
      // A (left)
      buttons |= (((~PINE) & 0B01000000) >> 2);
      // B (right)
      buttons |= (((~PINB) & 0B00010000) << 1);
      #else
      buttons = 0;
      #endif
      return buttons;
  }
  
  const uint8_t * NanoEngineInputs::s_gpioKeypadPins;
  
  void NanoEngineInputs::connectGpioKeypad(const uint8_t * gpioKeys)
  {
      NanoEngineInputs::s_gpioKeypadPins = gpioKeys;
  #ifdef SDL_EMULATION
      sdl_set_gpio_keys(gpioKeys);
  #endif
      m_onButtons = gpioButtons;
  }
  
  uint8_t NanoEngineInputs::gpioButtons()
  {
      uint8_t buttons = BUTTON_NONE;
      if ((s_gpioKeypadPins[0]) && (digitalRead(s_gpioKeypadPins[0]) == HIGH)) buttons |= BUTTON_DOWN;
      if ((s_gpioKeypadPins[1]) && (digitalRead(s_gpioKeypadPins[1]) == HIGH)) buttons |= BUTTON_LEFT;
      if ((s_gpioKeypadPins[2]) && (digitalRead(s_gpioKeypadPins[2]) == HIGH)) buttons |= BUTTON_RIGHT;
      if ((s_gpioKeypadPins[3]) && (digitalRead(s_gpioKeypadPins[3]) == HIGH)) buttons |= BUTTON_UP;
      if ((s_gpioKeypadPins[4]) && (digitalRead(s_gpioKeypadPins[4]) == HIGH)) buttons |= BUTTON_A;
      if ((s_gpioKeypadPins[5]) && (digitalRead(s_gpioKeypadPins[5]) == HIGH)) buttons |= BUTTON_B;
      return buttons;
  }
  
  void NanoEngineInputs::connectKY40encoder(uint8_t pina_clk, uint8_t pinb_dt, int8_t pinc_sw)
  {
      s_ky40_clk = pina_clk;
      s_ky40_dt = pinb_dt;
      s_ky40_sw = pinc_sw;
      m_onButtons = ky40Buttons;
  }
  
  uint8_t NanoEngineInputs::ky40Buttons()
  {
      static uint8_t last_clk = digitalRead( s_ky40_clk );
      uint8_t buttons = BUTTON_NONE;
      uint8_t clk = digitalRead( s_ky40_clk );
      if ( clk != last_clk )
      {
          if ( clk == HIGH )
          {
              buttons = digitalRead( s_ky40_dt ) == LOW ? BUTTON_DOWN : BUTTON_UP;
          }
          else
          {
              buttons = digitalRead( s_ky40_dt ) == HIGH ? BUTTON_DOWN : BUTTON_UP;
          }
      }
      last_clk = clk;
      if ( digitalRead( s_ky40_sw ) == LOW )
      {
          buttons |= BUTTON_A;
      }
      return buttons;
  }
  
  ///////////////////////////////////////////////////////////////////////////////
  ////// NANO ENGINE CORE CLASS /////////////////////////////////////////////////
  ///////////////////////////////////////////////////////////////////////////////
  
  /** Defaut frame rate for all engines */
  static const uint8_t ENGINE_DEFAULT_FPS = 30;
  
  /** Duration between frames in milliseconds */
  uint8_t   NanoEngineCore::m_frameDurationMs = 1000/ENGINE_DEFAULT_FPS;
  /** Current fps */
  uint8_t   NanoEngineCore::m_fps = ENGINE_DEFAULT_FPS;
  /** Current cpu load in percents */
  uint8_t   NanoEngineCore::m_cpuLoad = 0;
  /** Last timestamp in milliseconds the frame was updated on oled display */
  uint32_t  NanoEngineCore::m_lastFrameTs;
  /** Callback to call before starting oled update */
  TLoopCallback NanoEngineCore::m_loop = nullptr;
  
  
  void NanoEngineCore::begin()
  {
      m_lastFrameTs = millis();
  }
  
  void NanoEngineCore::setFrameRate(uint8_t fps)
  {
      if ( fps > 0 )
      {
          m_fps = fps;
          m_frameDurationMs = 1000/fps;
      }
  }
  
  bool NanoEngineCore::nextFrame()
  {
      bool needUpdate = (uint32_t)(millis() - m_lastFrameTs) >= m_frameDurationMs;
      if (needUpdate && m_loop) m_loop();
      return needUpdate;
  }
  
  