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J.P. Armstrong / mbgcSnake_01
Last commit 09 Jul 2011

Description: The first video game for the mbed video game console. The code utilizes the SimpleLib package developed by thomas@soete.org. For more information about the project and if you'd like to download the schematics and PCB design visit http://www.mbedgc.com/

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Show/hide line numbers mbedgc.cpp Source File

mbedgc.cpp

00001 #include "mbed.h"
00002 #include "colors.h"
00003 #include "timers.h"
00004 
00005 #define fbW 53
00006 #define fbH 242
00007 
00008 DigitalOut vSync(p29);
00009 DigitalOut hSync(p30);
00010 
00011 DigitalOut myled(LED1);
00012 
00013 
00014 void vsync();
00015 void hsync();
00016 void setup();
00017 void loop();
00018 void blankFB();
00019 void fill();
00020 
00021 unsigned int frame = 0;
00022 unsigned char framebuffer[fbH][fbW];
00023 
00024 int snake_x = 5;
00025 int snake_y = 50; 
00026 int snake_direction = 0;
00027 unsigned char snake_color = 1;
00028 
00029 
00030 TIMER0_INTERRUPT_HANDLER(void)
00031 {
00032     TIMER0_CLEAR_INTERRUPT(MR0_INT);
00033     
00034     myled = 1;
00035 
00036     vsync();
00037     for( int i = 0; i < fbH; i++ )
00038     {
00039         hsync();
00040         for( int j = 0; j < fbW; j++ )
00041         {
00042             unsigned char bp = framebuffer[ i ][ j ];
00043             COLOR_SET(bp);
00044         }
00045     }
00046     COLOR_SET(0);
00047     myled = 0;    
00048 }
00049 
00050 int main() {
00051     fill();
00052     NVIC_SetPriority(TIMER0_IRQn, 0);
00053 
00054     COLOR_INIT();
00055     TIMER0_INIT();
00056     TIMER0_SETPCLK(CCLK4);
00057     TIMER0_SETPRESCALE(96000); // 1ms = 96000 : 1
00058     TIMER0_SETMATCH(0, 1);
00059     TIMER0_SETMATCHCONTROL(0, MATCH_RESET | MATCH_INTERRUPT); // Reset and Interrupt each 100ms
00060     TIMER0_ENABLE_INTERRUPT();
00061     TIMER0_START();
00062 
00063     setup();
00064     
00065     while (1)
00066         loop();
00067 }
00068 
00069 void setup() {
00070 
00071 }
00072 
00073 void drawRectangle(int x, int y, int width, int height, unsigned char color) {
00074         
00075         if (x < 0 || y < 0)
00076             return; 
00077             
00078         for (int i = 0; i < height; i++) {
00079 
00080                for (int j = 0; j < width; j++) {
00081                                                                 
00082                     framebuffer[ (y + i) % fbH ][ (x + j) % fbW ] = color;
00083                     
00084                }
00085         }
00086 }
00087 
00088 
00089 void loop() {
00090 
00091     if (snake_y <= 0)
00092         snake_y = fbH - 1;
00093     
00094     if (snake_x <= 0)
00095         snake_x = fbW - 1;
00096         
00097     snake_y %= fbH;
00098     snake_x %= fbW;
00099     
00100     if (frame % (10 + rand() % 20) == 0) {
00101         snake_direction++;
00102         snake_direction %= 4;
00103         
00104         snake_color++;
00105     }
00106     
00107     
00108     switch (snake_direction) {
00109         case 0:
00110             snake_y += 4;
00111             break;
00112         case 2:
00113             snake_y -= 4;
00114             break;
00115         case 1:
00116             snake_x += 1;
00117             break;
00118         case 3:
00119             snake_x -= 1;
00120             break;
00121      }
00122 
00123     drawRectangle(snake_x, snake_y, 1, 4, snake_color);
00124     wait_us(10000);
00125 }
00126 
00127 void draw() 
00128 {
00129 
00130 }
00131 
00132 
00133 void hsync() 
00134 {
00135 
00136     COLOR_SET(0);
00137     hSync = 1;
00138     wait_us(4.8);
00139     hSync = 0;
00140     wait_us(4);
00141 }
00142 
00143 void vsync() 
00144 {
00145     vSync = 1;
00146     wait_us(1300);//650
00147     vSync = 0;
00148     frame++;
00149     
00150     if (frame == 65535)
00151         frame = 0;
00152 }
00153 
00154 
00155 
00156 void fill() {
00157 
00158     for (int i = 0; i < fbH; i++) {
00159 
00160         for (int j = 0; j < fbW; j++) {
00161             
00162             if ( (i / 5) % 2 == 0 ) {
00163             
00164                  if ( (j / 2) % 2 == 0 )
00165                     framebuffer[i][j] = 3;
00166                 else
00167                     framebuffer[i][j] = 0;
00168             }
00169             else {
00170                 if ( (j / 2) % 2 == 0 )
00171                     framebuffer[i][j] = 0;
00172                 else
00173                     framebuffer[i][j] = 28;
00174             }
00175         }
00176     }
00177 
00178 }
00179 
00180 void blankFB() {
00181     for (int i = 0; i < fbH; i++) {
00182         for (int j = 0; j < fbW; j++) {
00183             framebuffer[i][j] = 0;
00184         }
00185     }
00186 
00187 }