File content as of revision 1:57efa2224451:

// May 2013
// HJK Test PWM sine generator
// Reads 2 potmeter (value 0 to 1 float) and generates a sine wave with amplidute and freq.
// The resulting value is sent to Led 3 and PWM output 1

#include "mbed.h"
//#include "math.h"
//#include "Tables.cpp"

Serial pc(USBTX, USBRX); // tx, rx
DigitalOut led1(LED1);  // main led
DigitalOut led2(LED2);  // Interrupt led
PwmOut led3(LED3), aPwm0(p23);

Ticker t;

//int SineTable tSineTable;
 
Timer tmr1;
AnalogIn AD1(p20), AD2(p19);

unsigned int ServoCnt, BackgrCnt, ServoTime; 
float Potm1, Potm2;

int TableIndex;
int SineOut0, SineOut1, SineOut2;       // The Sine output values
float mSineOut0, mSineOut1, mSineOut2;  // The multiplied Sine output values


int PwmTime_us = 10000;
int Sin1Offset = 120, Sin2Offset = 240;  // Offsets for two other phase outputs

int SineTable[360] = {0, 17, 35, 52, 70, 87, 105, 122, 139, 156 
,174, 191, 208, 225, 242, 259, 276, 292, 309, 326 
,342, 358, 375, 391, 407, 423, 438, 454, 469, 485 
,500, 515, 530, 545, 559, 574, 588, 602, 616, 629 
,643, 656, 669, 682, 695, 707, 719, 731, 743, 755 
,766, 777, 788, 799, 809, 819, 829, 839, 848, 857 
,866, 875, 883, 891, 899, 906, 914, 921, 927, 934 
,940, 946, 951, 956, 961, 966, 970, 974, 978, 982 
,985, 988, 990, 993, 995, 996, 998, 999, 999, 1000 
,1000, 1000, 999, 999, 998, 996, 995, 993, 990, 988 
,985, 982, 978, 974, 970, 966, 961, 956, 951, 946 
,940, 934, 927, 921, 914, 906, 899, 891, 883, 875 
,866, 857, 848, 839, 829, 819, 809, 799, 788, 777 
,766, 755, 743, 731, 719, 707, 695, 682, 669, 656 
,643, 629, 616, 602, 588, 574, 559, 545, 530, 515 
,500, 485, 469, 454, 438, 423, 407, 391, 375, 358 
,342, 326, 309, 292, 276, 259, 242, 225, 208, 191 
,174, 156, 139, 122, 105, 87, 70, 52, 35, 17 
,0, -17, -35, -52, -70, -87, -105, -122, -139, -156 
,-174, -191, -208, -225, -242, -259, -276, -292, -309, -326 
,-342, -358, -375, -391, -407, -423, -438, -454, -469, -485 
,-500, -515, -530, -545, -559, -574, -588, -602, -616, -629 
,-643, -656, -669, -682, -695, -707, -719, -731, -743, -755 
,-766, -777, -788, -799, -809, -819, -829, -839, -848, -857 
,-866, -875, -883, -891, -899, -906, -914, -921, -927, -934 
,-940, -946, -951, -956, -961, -966, -970, -974, -978, -982 
,-985, -988, -990, -993, -995, -996, -998, -999, -999, -1000 
,-1000, -1000, -999, -999, -998, -996, -995, -993, -990, -988 
,-985, -982, -978, -974, -970, -966, -961, -956, -951, -946 
,-940, -934, -927, -921, -914, -906, -899, -891, -883, -875 
,-866, -857, -848, -839, -829, -819, -809, -799, -788, -777 
,-766, -755, -743, -731, -719, -707, -695, -682, -669, -656 
,-643, -629, -616, -602, -588, -574, -559, -545, -530, -515 
,-500, -485, -469, -454, -438, -423, -407, -391, -375, -358 
,-342, -326, -309, -292, -276, -259, -242, -225, -208, -191 
,-174, -156, -139, -122, -105, -87, -70, -52, -35, -17 
};


// A class for flip()-ing a DigitalOut 
class Flipper {
public:
    Flipper(PinName pin) : _pin(pin) {
        _pin = 0;
    }
    void flip() 
    {int starttime, endtime;
    
        starttime = tmr1.read_us();         // Measure time 1
        _pin = !_pin;                       // toggle led 2
        
        Potm1 = AD1.read(); Potm2 = AD2.read();  // Get potmeters
        led3.pulsewidth_us(Potm1 * PwmTime_us);     // Set duty cycle for LED
        aPwm0.pulsewidth_us(Potm1 * PwmTime_us);    // Set DC amp out 0
        
        TableIndex = ceil(Potm1 * 359);
        SineOut0 = SineTable[TableIndex];   // Get sine value from table
        mSineOut0 = SineOut0 * Potm2;        // Multiply sine with potmeter
        
        ServoCnt++;                         // Servo counter
        endtime = tmr1.read_us();           // Measure time 2
        ServoTime = endtime - starttime;
    }
private:
    DigitalOut _pin;
};

Flipper f(LED2);

// Init program
void DoInit(void) {
    pc.baud(115200);
    tmr1.start();

    t.attach_us(&f, &Flipper::flip, 100000); // the address of the object, member function, and interval
//    t.attach_us(&f, &Flipper::flip, 25); // the address of the object, member function, and interval
                                            // 25 us = 40kHz
//    led3 = 1;
    led3.period_us(PwmTime_us);            // Set the period to 10mS = 100Hz
//    aPwm0.period_ms(PwmTime_us);    // Set the period for the pwm output to amplifier

    pc.printf("The Init time was %f seconds\n\r", tmr1.read());
  //  Return 0;
}

   
int main() {
    DoInit();

    while(1) {
        BackgrCnt++;
        led1 = 1;
        wait(0.2);
        led1 = 0;
        wait(0.2);
        pc.printf("Servotm: %i, ServoCnt: %i , BackgrCnt: %i , Potm1: %.2f, Potm2: %i, TableIndex :%i, SineOut0: %i , mSineOut0: %.2f\r",
         ServoTime, ServoCnt, BackgrCnt, Potm1, Potm2, TableIndex, SineOut0, mSineOut0 );
    }
}