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TDC TOF AVERAGE MEASUREMETN AND TRRIGER PIN USE IN PROGRAMM

Lakhbir Singh
Prodigy 20 points
Other Parts Discussed in Thread: TDC1000, TDC7200

Hello Sir,

 i am using TDC1000-7200evm for flow metering  and also developed a new code as i am using my own controller to use TDC1000 and 7200.

I am able to get TOF1 TO TOF5 but  the problem i am facing are :

1. How to measure the delta TOF and Average it .

2. I always have to  set the START_Meas bit to start new measurement.

3. after some time TDC7200 spi stop responding.

4. the TOF values i am getting is not relevant i.e they are not changing according to flow .

  • 0
    TI__Mastermind 21685 points

    Lakhbir,

    FYI, the T1000-TDC7200EVM firmware source code is part of the GUI installation and can be found under in the following install folder

    C:\Program Files (x86)\Texas Instruments\TDC1000_7200EVM\Firmware

    You can refer to the function "tdc_trigger_measure()" in file timer_queue.c to see how up and downstream measurements are made for flow. Also, you can refer to the attached documents

    Thanks,

    Vishy

    www.ti.com/.../snia020.pdf

    Interfacing a water flow sesnor to TDC1000-TDC7200EVM (1).pdf

  • 0 in reply to Vishy Viswanathan
    Prodigy 20 points

    hi vishy,

    Thanks for responce  i have gone through your  these document and code they have calculated the TOF accurately .But i hink the code i have created for TOF measurement is also workable or not. calculation part of code is as follow

    void CalDelta_TOF()
    {
    switch(count)
    {
    case 0:
    for(int n=0; n < MAX_STOPS; n++)
    {
    TOF_up[n]=start2stop[n];
    }
    c=1;
    count++;
    break;

    case 1:
    for(int n=0; n < MAX_STOPS; n++)
    {
    TOF_DN[n]=start2stop[n];
    }
    b=1;
    count=0;
    break;
    default:
    printf_string("\n TOF NOT YET CALCULATED");
    }
    if(c&&b)
    {
    for(int n=0; n < MAX_STOPS; n++)
    {
    Delta_TOF[n]= ((TOF_DN[n] - TOF_up[n]));
    array[0]=array[1];
    array[1]=array[2];
    array[2]=array[3];
    array[3]=array[4];
    array[4]=Delta_TOF[n]/100;
    avg[n] = (array[0]+array[1]+array[2]+array[3]+array[4])/5;
    sprintf((char *)outString, "\nAverage Delta TOF[%d]: %4.6f \t ", n, avg[n]);
    printf_string((char *)outString);
    sprintf((char *)outString, " TOF[%d]: %6.6f \t",n,start2stop[n]);
    printf_string((char *)outString);
    /* sprintf((char *)outString, "DELTA TOF[%d]: %6.6f \r",n,Delta_TOF[n]/1000);
    printf_string((char *)outString);*/
    }
    D=(1487*(start2stop[0])/2); //(start2stop[0]) ;


    }
    printf_string("\n \n");

    }

    Also tell is  i have to calculate the Avg to get a stabel accurate and preciese result.