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Posts posted by vonPuffelen

  1. Hi Brian,

    We have to dig deeper into the data types we are using. The integer: 1048576 is binary: 0b100000000000000000000. it contains 20 zeroes and 1 one. This is what we want to send. Lets say we want to send at 100 khz, this means the width of high is 10 microsecond. To get this frequency out we need to divide the main frequency with a divider. This divider is hzSys.value/PrefferedFrequency.

    channel0 = c_int(0)
    enable   = c_int(1)
    pulsesLo = 50
    pulsesHi = 974
    prefferedFrequency = 100e3
    pulse    = c_int( 0b1<<(math.floor((pulsesHi+pulsesLo)/pulsesLo)) )
    pulseLength = c_int( 1+math.floor((pulsesHi+pulsesLo)/pulsesLo) )
    hzSys = c_double()
    dwf.FDwfDigitalOutInternalClockInfo(hdwf, byref(hzSys))
    dwf.FDwfDigitalOutEnableSet(hdwf, channel0, enable)
    dwf.FDwfDigitalOutTypeSet(hdwf, channel0, DwfDigitalOutTypeCustom)
    dwf.FDwfDigitalOutDividerSet(hdwf, channel0, c_int(int(hzSys.value/prefferedFrequency)))
    dwf.FDwfDigitalOutDataSet(hdwf, channel0, pulse, c_int(pulsesHi+pulsesLo))
    dwf.FDwfDigitalOutConfigure(hdwf, enable)


  2. I try to receive data with an Analog Discovery Kit (AD) from a FPGA written with my own protocol. Three signals enter the AD: Clock, Trigger, and Data. At the rising edge of the trigger, I would like to sample 16 bits from the data synchronous to the clock (around 20 Mhz). How can this be done with an AD and SDK? With an FPGA writing this is a matter of minutes, but some how I cannot wrap my head around this. Below is the code I am using, but sadly it returns only 0x0000 or 0x000.

    How to receive data in this way?


    FDwfDigitalInConfigure(AnalogDiscoveryHandle, false, true);  // start sampling
    STS sts;
    unsigned int timer = 0;// wait for receiving
      if(!FDwfDigitalInStatus(AnalogDiscoveryHandle, true, &sts)) // pull for trigger event
        return 42;
    }while((sts != stsDone) && (timer < 0x1FFF));
    FDwfDigitalInStatusData(AnalogDiscoveryHandle, data, length*sizeof(unsigned short)); // fetch data from IO buffer.
    FDwfDigitalInConfigure(AnalogDiscoveryHandle, false, false);  // stop sampling