File content as of revision 0:924cdaeea469:

// 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"

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

Ticker t;
 
Timer tmr1;
AnalogIn AD1(p20), AD2(p19);

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

int TableIndex, SineOut0;

int PwmTime_us = 10000;
int SineTable[360] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9
, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19
, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29
, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39
, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49
, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59
, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69
, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79
, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89
, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99
, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109
, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119
, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129
, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139
, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149
, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159
, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169
, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179
, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189
, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199
, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209
, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219
, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229
, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249
, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259
, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269
, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279
, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289
, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299
, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309
, 310, 311, 312, 313, 314, 315, 316, 317, 318, 319
, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329
, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339
, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349
, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359};

// 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
        
        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: ,%.2f, TableIndex %i, SineOut0 %i\r",
         ServoTime, ServoCnt, BackgrCnt, Potm1, Potm2, TableIndex, SineOut0 );
    }
}