main.cpp

00001 /*
00002 ELEC2645 Embedded Systems Project
00003 School of Electronic & Electrical Engineering
00004 University of Leeds
00005 Name: Andrew Moore
00006 Username: el16ajm
00007 Student ID Number: 201042893
00008 Date:
00009 */
00010 
00011 /** The Main class
00012 * @brief Sends and recives data from the Menu and Engine classes, alters the refresh rate and calls all drawing from other classes
00013 * @author Andrew J. Moore
00014 * @date May, 2018
00015 */
00016 
00017 #include "mbed.h"
00018 #include "Gamepad.h"
00019 #include "N5110.h"
00020 #include "Engine.h"
00021 #include "Menu.h"
00022 
00023 /////////////// structs /////////////////
00024 struct UserInput {
00025     Direction d;
00026 };
00027 
00028 /////////////// objects ///////////////
00029 N5110 lcd(PTC9,PTC0,PTC7,PTD2,PTD1,PTC11);
00030 Gamepad pad;
00031 Engine gameEngine;
00032 Menu mainMenu;
00033 
00034 ///////////// prototypes ///////////////
00035 /** Initialization function */
00036 void init();
00037 
00038 /** Initialization function */
00039 void update_game(UserInput input);
00040 
00041 /** Draws the game onto the LCD */
00042 void renderGame();
00043 
00044 /** Draws the menu onto the LCD */
00045 void renderMenu();
00046 
00047 /** Draws the welcome screen onto the LCD */
00048 void welcome();
00049 
00050 /** Draws the transition screen onto the LCD */
00051 void transition();
00052 
00053 /** Resets game and menu logic once a game over state has been reached */
00054 void reset();
00055 
00056 /** Sets the difficulty/refresh rate */
00057 float setDif();
00058 
00059 ///////////// functions ////////////////
00060 int main()
00061 {
00062     printf("Loaded\n");
00063     init();
00064     welcome();
00065 
00066     transition();
00067 
00068     // game loop - read input, update the game state and render the display
00069     while (1) {
00070         if (!mainMenu.started()) { //menu logic and rendering
00071             mainMenu.read_input(pad);
00072             mainMenu.update();
00073             gameEngine.setLvl(mainMenu.getLvl());
00074             renderMenu();
00075         } else if (gameEngine.getGameOver()) { //resets the game once a game over state has been reached
00076             gameEngine.gameOverScreen(lcd);
00077             reset();
00078         } else { //game logic and rendering
00079             gameEngine.read_input(pad);
00080             gameEngine.update(pad);
00081             renderGame();
00082         }
00083     }
00084 }
00085 
00086 void welcome()
00087 {
00088     printf("Welcome Screen\n");
00089     
00090     lcd.printString("     Snake!    ",0,1);
00091     lcd.printString("  Press Start ",0,4);
00092     lcd.refresh();
00093 
00094     // wait flashing LEDs until start button is pressed
00095     while ( pad.check_event(Gamepad::START_PRESSED) == false) {
00096         pad.leds_on();
00097         wait(0.1);
00098         pad.leds_off();
00099         wait(0.1);
00100     }
00101     wait(0.1);
00102 
00103 }
00104 
00105 void init()
00106 {
00107     // need to initialise LCD and Gamepad
00108     gameEngine.init();
00109     lcd.init();
00110     pad.init();
00111     mainMenu.init();
00112     
00113     printf("Initialised\n");
00114 
00115 }
00116 
00117 void reset()
00118 {
00119     mainMenu.init();        //resets both the mainMenu and gameEngine
00120     gameEngine.init();      //the gameEngine will reset the food and the snake in the process
00121     
00122     printf("Reset\n");
00123 }
00124 
00125 void renderGame()
00126 {
00127     // clear screen, re-draw and refresh
00128     lcd.clear();
00129     gameEngine.draw(lcd);
00130     lcd.refresh();
00131     wait(setDif()); //adaptive fps depending on difficulty
00132     
00133     printf("Game Rending\n");
00134 }
00135 
00136 void renderMenu()
00137 {
00138     // clear screen, re-draw and refresh
00139     lcd.clear();
00140     mainMenu.draw(lcd);
00141     lcd.refresh();
00142     wait(1.0f/8); //fixed at 8 fps
00143     
00144     printf("Menu Rending\n");
00145 }
00146 
00147 void transition()
00148 {
00149     //transition animation between modes to reduce 'ghosting' of inputs
00150     
00151     printf("Transisitoning\n");
00152     
00153     for (int i = 0; i <= 11; i++) {                 //max values for i and j were chosen as the screen is 84x44 and the sqaures being drawn are 4x4
00154         for (int j = 0; j <= 21; j++) {
00155             lcd.drawRect(j*4,i*4,4,4,FILL_BLACK);   //covers the entire screen in 4x4 squares
00156             wait(0.005);                            //waits a small amount of time to allow the screen to keep up
00157             lcd.refresh();
00158         }
00159     }
00160 
00161 }
00162 
00163 float setDif()
00164 {
00165     int _dif = mainMenu.getDif();
00166 
00167     if (_dif == 1) {                         //Low difficulty
00168         return 1.0f/4;
00169     } else if (_dif == 2) {                  //Medium difficulty
00170         return 1.0f/8;
00171     } else if (_dif == 3) {                  //Hard difficulty
00172         return 1.0f/12;
00173     } else {                                 //Adaptive difficulty
00174         float _delta = gameEngine.getScore(); 
00175         
00176         printf("Delta %4.2f\n", _delta);
00177         
00178         if (_delta < 25) {                   //Limits FPS to 25
00179             return ((1.0f/(_delta + 1)));    //changes the fps depending on score
00180         } else {
00181             return (1.0f/25);
00182         }
00183     }
00184 }