Kamil Ondrousek
Chua chaotic oscillator and MCP4922 DAC
main.cpp@0:e5edc0373da0, 2011-05-07 (annotated)
- Committer:
- JLS
- Date:
- Sat May 07 19:27:14 2011 +0000
- Revision:
- 0:e5edc0373da0
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| JLS | 0:e5edc0373da0 | 1 | #include "mbed.h" |
| JLS | 0:e5edc0373da0 | 2 | #include "MCP4922.h" |
| JLS | 0:e5edc0373da0 | 3 | |
| JLS | 0:e5edc0373da0 | 4 | MCP4922 MCP(p5, p7,p8); // MOSI, SCLK, CS |
| JLS | 0:e5edc0373da0 | 5 | |
| JLS | 0:e5edc0373da0 | 6 | int main() { |
| JLS | 0:e5edc0373da0 | 7 | |
| JLS | 0:e5edc0373da0 | 8 | MCP.frequency(1000000); |
| JLS | 0:e5edc0373da0 | 9 | |
| JLS | 0:e5edc0373da0 | 10 | float x = 0.5; |
| JLS | 0:e5edc0373da0 | 11 | float y = 0.25; |
| JLS | 0:e5edc0373da0 | 12 | float z = 0.125; |
| JLS | 0:e5edc0373da0 | 13 | float oldx = 0; |
| JLS | 0:e5edc0373da0 | 14 | float oldy = 0; |
| JLS | 0:e5edc0373da0 | 15 | float oldz = 0; |
| JLS | 0:e5edc0373da0 | 16 | |
| JLS | 0:e5edc0373da0 | 17 | float dt = 0.005; |
| JLS | 0:e5edc0373da0 | 18 | |
| JLS | 0:e5edc0373da0 | 19 | float alpha = 15.6; |
| JLS | 0:e5edc0373da0 | 20 | float beta = 28.58; |
| JLS | 0:e5edc0373da0 | 21 | float a = -1.14286; |
| JLS | 0:e5edc0373da0 | 22 | float b = -0.714286; |
| JLS | 0:e5edc0373da0 | 23 | float h = 0; |
| JLS | 0:e5edc0373da0 | 24 | |
| JLS | 0:e5edc0373da0 | 25 | int xout = 0; |
| JLS | 0:e5edc0373da0 | 26 | int yout = 0; |
| JLS | 0:e5edc0373da0 | 27 | |
| JLS | 0:e5edc0373da0 | 28 | while (1) { |
| JLS | 0:e5edc0373da0 | 29 | |
| JLS | 0:e5edc0373da0 | 30 | oldx = x; |
| JLS | 0:e5edc0373da0 | 31 | oldy = y; |
| JLS | 0:e5edc0373da0 | 32 | oldz = z; |
| JLS | 0:e5edc0373da0 | 33 | |
| JLS | 0:e5edc0373da0 | 34 | h = (b * x) + (0.5 * (a - b) * (abs(x+1) - abs(x-1))); |
| JLS | 0:e5edc0373da0 | 35 | |
| JLS | 0:e5edc0373da0 | 36 | x = oldx + dt * (alpha * (oldy - oldx - h)); |
| JLS | 0:e5edc0373da0 | 37 | y = oldy + dt * (oldx - oldy + oldz); |
| JLS | 0:e5edc0373da0 | 38 | z = oldz + dt * (-beta * oldy); |
| JLS | 0:e5edc0373da0 | 39 | |
| JLS | 0:e5edc0373da0 | 40 | xout = 2047+(850*x); |
| JLS | 0:e5edc0373da0 | 41 | yout = 2047+6*(800*y); |
| JLS | 0:e5edc0373da0 | 42 | |
| JLS | 0:e5edc0373da0 | 43 | MCP.writeA(xout); |
| JLS | 0:e5edc0373da0 | 44 | MCP.writeB(yout); |
| JLS | 0:e5edc0373da0 | 45 | |
| JLS | 0:e5edc0373da0 | 46 | } |
| JLS | 0:e5edc0373da0 | 47 | } |