main.cpp

00001 #include "mbed.h"
00002 #include "vga640x480g.h"
00003 
00004 int main() {
00005 
00006     init_vga();
00007 
00008     vga_cls();
00009 
00010     vga_box(0,0,639,479,WHITE);
00011     
00012     vga_putstring(10,10,"Chua chaotic oscillator",WHITE);
00013     
00014     float x = 0.5;
00015     float y = 0.25;
00016     float z = 0.125;
00017     float oldx = 0;
00018     float oldy = 0;
00019     float oldz = 0;
00020         
00021     float dt = 0.005;
00022     
00023     float alpha = 15.6;
00024     float beta = 28.58;
00025     float a = -1.14286;
00026     float b = -0.714286;
00027     float h = 0;
00028     
00029     int xout = 0;
00030     int yout = 0;
00031  
00032  while (1) {
00033  
00034     oldx = x;
00035     oldy = y;
00036     oldz = z;
00037 
00038     h = (b * x) + (0.5 * (a - b) * (abs(x+1) - abs(x-1)));
00039                 
00040     x = oldx + dt * (alpha * (oldy - oldx - h));
00041     y = oldy + dt * (oldx - oldy + oldz);
00042     z = oldz + dt * (-beta * oldy);
00043     
00044     xout = 320+(136*x);
00045     yout = 240+(556*y); 
00046 
00047     vga_plot(xout,yout,WHITE);
00048     
00049 }
00050 
00051   }    
00052