AD2 and Waveforms: Best way to decode analog input signals

[DigilentFan]

Sometimes, (if digital protocol analysis struggles) it is desired to decode protocols at analog input signals (for e.g. to look in depth into rise/fall times, signal levels changed by pull resistors etc.). Is there a way to select the analog inputs as source for the protocol decoders in waveforms?

If yes, how are the signals mapped to LOW - HIGH? How to use it?

Is it possible to mix up analog and digital signals (for e.g. in case of I2C: SDATA as analog and CLK as digital input)?

If not is there a suggested way around (for e.g.  acquire analog data, and feed this data into a script, performing the one bit AD conversion as well as the protocol decoding) with the advantage to get decoding done by waveforms?

[attila]

Hi @DigilentFan

You could use a script like this to port Scope data to Logic Analyzer.

function toDigital(rg){
    var rgd = [];
    var l = 0;
    rg.forEach(function(v){
        if(v<1.0) l = 0; // logic with hysteresis, < 1V
        else if(v>2.0) l = 1; // > 2V
        rgd.push(l);
    })
    return rgd;
}
var rg1 = toDigital(Scope.Channel1.data);
var rg2 = toDigital(Scope.Channel2.data);
var rg = [];
var c = rg1.length;
for(var i = 0; i < c; i++){
    rg.push(rg1[i]|(rg2[i]<<1)); // Scope1 as DIO0 and Scope2 as DIO1
}
Logic.RemoveTab("FromScope");
Logic.AddTab("FromScope", rg, Scope.Time.Rate.real);

 

[DigilentFan]

Thank's a lot for the quick response!