Diff: main.h

Revision:

0:9eb93eff2469

Child:

1:ab8ceac59e71

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.h	Sun May 08 20:10:54 2016 +0000
@@ -0,0 +1,97 @@
+/**
+@file main.h
+@brief Header file contains functions and variables
+@brief Snake Game - Embedded Systems Project
+@brief Revision 1.0
+@author Thokozile Tembo
+@Date 05/05/2016
+*/
+
+#include "mbed.h"
+#include "N5110.h"
+#define DIRECTION_TOLERANCE 0.05
+
+// LCD Object
+N5110 lcd(PTE26 , PTA0 , PTC4 , PTD0 , PTD2 , PTD1 , PTC3);
+// Serial Communication with PC
+Serial pc(USBTX, USBRX);
+// Analog inputs
+AnalogIn joy_x(PTB2);
+AnalogIn joy_y(PTB3);
+AnalogIn pot(PTB10);
+// Buttons
+DigitalIn joy_button(PTB11); //  needs pull-down (active high)
+InterruptIn pcb_button(PTB18); // needs pull-down (active high)
+// PWM Output (LED and Buzzer)
+PwmOut pcb_led(PTC2); //
+PwmOut pcn_buzzer(PTA2);
+
+// Ticker for joystick update
+Ticker joystick_update_ticker;
+
+// Initialising board board
+void init_K64F();
+// Welcome screen
+void welcomeScreen();
+
+// Defining possible joystick directions (enum)
+enum DirectionName {
+    UP,
+    DOWN,
+    LEFT,
+    RIGHT,
+    CENTRE,
+    UNKNOWN
+};
+// Variable to store previous direction of the joystick
+DirectionName prevDirection = UNKNOWN;
+
+// Joystick type definition
+struct JoyStick {
+    double x;    /// current x value
+    double x0;   /// 'centred' x value
+    double y;    /// current y value
+    double y0;   /// 'centred' y value
+    int button; /// button state (assume pull-down used, so 1 = pressed, 0 = unpressed)
+    DirectionName direction;  // current direction
+} joystick;
+
+// Apple type definition
+struct AppleType {
+    int x; // Apple X
+    int y; // Apple Y
+};
+
+// Defining possible states (enum)
+typedef enum {
+        INIT,
+        WAIT_FOR_USER,
+        PLAY,
+        GAME_OVER
+} GAME_STATES; //States used in the main loop
+
+GAME_STATES game_state = INIT; // Default state of the game
+
+// Global variables
+volatile int g_pcb_button_flag = 0; 
+
+// Function prototypes
+void calibrateJoystick();
+void updateJoystick();
+void snake_game();
+
+// These functions are used to map game
+// field of 20x11 to the LCD screen which is 84x48
+
+// Enable square (4x4 pixels) at x, y
+void drawBlock(int field_x, int field_y);
+// Draw Apple (4x4 pixels) at x, y
+void drawApple(int field_x, int field_y);
+// Disable square (4x4 pixels) at x, y
+void eraseBlock(int field_x, int field_y);
+// Get the status of the square (4x4 pixels) at x, y
+int getBlock(int field_x, int field_y);
+// Place an apple at random location (returns food structure)
+AppleType placeRandomApple();
+// pcb_button interrupt function
+void pcb_button_isr();
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