sine-wave.cpp

00001 #include "mbed.h"
00002 #include "AnalogOut.h"
00003 #include "AnalogIn.h"
00004 #include <math.h>
00005 
00006 #define I2C0_SDA PTE25
00007 #define I2C0_SCL PTE24
00008 #define MMA8451_I2C_ADDRESS (0x1d<<1)
00009 #define MAG3110_I2C_ADDRESS (0x0E<<1)
00010 #define LIGHT_SENSOR_PIN PTE22
00011 #define PI 3.141f
00012 
00013 Serial pc_sine(USBTX, USBRX);
00014 Timer timer;
00015 
00016 
00017 void sine_wave()
00018 {
00019     int t = 0;
00020     float s;
00021     AnalogOut a(PTE30);
00022     while (1) { // sin(2 * PI * f * t / Fs)
00023         s = sin(2 * PI * 1 * t / 100.0);
00024         s = s/2 + .5;
00025         a.write(s);
00026         pc_sine.printf ("%f\n", s);
00027         if (t == 100)
00028             t = 0;
00029         else
00030             t++;
00031         wait(0.01);
00032     }
00033 }
00034 
00035 void sine_wave_read()
00036 {
00037     AnalogIn a(PTB0);
00038     while(1) {
00039         pc_sine.printf("%f\n", a.read());
00040         wait(0.01);
00041     }
00042 }
00043 
00044 /*
00045 int main() {
00046     sine_wave();
00047 
00048     char c = pc_sine.getc();
00049     
00050     switch (c) {
00051         case '1':sine_wave();
00052             break;
00053         case '2': sine_wave_read();
00054             break;
00055     }
00056 }
00057 */