File content as of revision 1:f857c10c3cd2:

#include "mbed.h"
#include "config.h"

#define READBUFFERSIZE (32)

RawSerial pc(USBTX, USBRX);
DigitalIn sw2(SW2);
DigitalIn sw3(SW3);
InterruptIn zeroCross(A2);//Arduino A2
Timer halfCycle;
Ticker freqGen;
Ticker sampler;
DigitalOut do1(D7);//Arduino D7
DigitalOut do2(D6);//Arduino D6
AnalogIn Vrms(A0);
AnalogIn Arms(A1);
//LocalFileSystem local("local");
//FlashIAP flash;

int flip = 0;
int halfPeriod = 16600;
float freq = 60;
float period = 0;
double setFreq = 50.00;
double periodFreqGen;
float Vsample[32];
float Asample[32];
int sample = 0;
int sampleMax = 0;
float Vhold[32];
float Ahold[32];
int i;
int j;
int cycleFlag = 0;
double VsumSq = 0;
double Vmean = 0;
double Vroot = 0;
double AsumSq = 0;
double Amean = 0;
double Aroot = 0;
char tempBuffer[20];
char buffer[20];
char k = 0;
char c;

void rxCallback()
{
    do1 = 1;
    c = pc.getc();
    do1 = 0;
    tempBuffer[k] = c;
    k++;
    do1 = 1;
    if ( c == '\n' )
    {
        k = 0;
        strncpy(buffer,tempBuffer,sizeof(tempBuffer));
        memset(tempBuffer,0,sizeof(tempBuffer));
    }
    //pc.printf("\n%s\n", &buffer); //echo back to terminal
    do1 = 0;
}

void sampleTimer()
{
    do2 = 1;
    Asample[sample] = ( 1 / 0.34286 ) * 3.3 * Arms.read();
    Vsample[sample] = 64.7519 * 3.3 * Vrms.read();
    sample++;
    if ( sample == 33 ) //In case there is no zero cross signal
    {
        sample = 0;
        cycleFlag = 1;
        }
    do2 = 0;
}

void startMeasFreq()
{
    halfCycle.start();
    sampler.detach();
    sampler.attach(&sampleTimer, (periodFreqGen / 32) );
    for (j = 0; j < 32; j++) {
        Vhold[j] = Vsample[j];
        Ahold[j] = Asample[j];
    }
    cycleFlag = 1;
    sampleMax = sample;
    sample = 0; //Reset the sample counter
}

void stopMeasFreq()
{
    halfPeriod = ( halfPeriod + halfCycle.read_us() ) /2;
    halfCycle.stop();
    halfCycle.reset();
}    

int main()
{

    float VA;
    int PercentLoad = 0;

    //NVIC_SetPriority(PORTC_IRQn, 2);
    pc.baud(115200);
    pc.printf("\n\nFRDM-K22F Power Conditioner.\n\n");
    do1 = 0;
    do2 = 0;

    while(pc.readable()) {
        //char e = pc.getc();
    }

    
    memset(buffer,0,sizeof(buffer));
    wait(2.0);
    periodFreqGen = ( ( 1 / freq ) );
    //pc.printf("periodFreqGen: %f\n",periodFreqGen);
    sampler.attach(&sampleTimer, (periodFreqGen / 32) );
    zeroCross.fall(&startMeasFreq);
    zeroCross.rise(&stopMeasFreq);
    pc.attach(&rxCallback,pc.RxIrq);//Serial::RxIrq);
    while(1) 
    {
        period = halfPeriod * 2;
        freq = 0.5 * ( 1000000 / halfPeriod );

        if (cycleFlag == 1) 
        {
            for (i=0; i<32; i++) 
            {
                VsumSq = VsumSq + (Vhold[i] * Vhold[i]);
                AsumSq = AsumSq + (Ahold[i] * Ahold[i]);
            }
            Vmean = VsumSq / 32;
            Amean = AsumSq / 32;
            Vroot = ( Vroot + sqrt(Vmean) ) / 2;
            Aroot = ( Aroot + sqrt(Amean) ) / 2;
            VA = Vroot * Aroot;
            PercentLoad = (int)(100 * ( VA / NOMVA ));

            VsumSq = 0;
            AsumSq = 0;
            cycleFlag = 0;
        }
        if (strncmp (buffer,"PID.FORMAT",10) == 0) 
        {
            pc.printf("PID.FORMAT=PROT;VER;UID;BAT;BTM;INP;OUT;ALM;TST;SET;PDU;SYS;OEM;BUZ\n");
            memset(buffer,0,sizeof(buffer));
        } else if (strncmp (buffer,"PID",3) == 0) 
        {
            pc.printf("PID=CUSPP;1.13;1;0;0;0;1;0;0;0;0;1;0;0\n");
            memset(buffer,0,sizeof(buffer));
        } else if (strncmp (buffer,"UID",3) == 0) 
        {
            pc.printf("UID=AMETEK-POWERVAR;%s;%s;ABC;;PowerCond;%s;20150715\n", &MODEL, &MODEL, &SERIALNO);
            memset(buffer,0,sizeof(buffer));
        } else if (strncmp (buffer,"SYS.FORMAT",10) == 0) 
        {
            pc.printf("SYS.FORMAT=TOPLGY.N;INVOLT.N;INFRQ.N;INPHS.N;OUTVLT.N;OUTFRQ.N;OUTVA.N;OUTPWR.N;OUTPHS.N;HITEMP.W;OUTQTY.N;OVRLOD.W\n");
            memset(buffer,0,sizeof(buffer));
        } else if (strncmp (buffer,"SYS",3) == 0) 
        {
            pc.printf("SYS=0;%d;%d;1;%d;%d.%d;%d;1;35;1;100\n", NOMV, NOMF, NOMV, NOMF, NOMVA, NOMVA);
            memset(buffer,0,sizeof(buffer));
        } else if (strncmp (buffer,"OUT.FORMAT",10) == 0) 
        {
            pc.printf("OUT.FORMAT=SOURCE.N;FREQ.N;VOLT.N;AMP.N;PWR.N;PERCNT.N\n");
            memset(buffer,0,sizeof(buffer));
        } else if (strncmp (buffer,"OUT",3) == 0) 
        {
            pc.printf("OUT=0;%3.1f;%3.1f;%3.1f:%.0f;%d\n", freq, Vroot, Aroot, VA, PercentLoad);
            memset(buffer,0,sizeof(buffer));
        } else if ((buffer[0]) != 0) 
        {
            pc.printf("?\n");
            memset(buffer,0,sizeof(buffer));
        }
        wait(1.0);
    }
}