Convert time between falling edges to RPM math channel?

[qwertylex]

As in the attached screenshot, the falling edge to falling edge time is 84.31663Hz which would be a data point of 5,058.996 RPM
is there a way to use the math channel to convert this to an RPM graph?
I've also attached an acquisition example.
Thanks!

test1.dwf3scopeacq

[attila]

Hi @qwertylex

You can use a custom Math in Scope where the RPM value is for the previous pulse.
You can also use Logic Analyzer Custom interpreter to show the value of each pulse.

var f = C1>1.5;
if(prev==false && f==true){
    last = sum;
    sum = 0;
}
sum++;
prev = f;
return Rate/last*3600;

// rgData: input, raw digital data array
// rgValue: output, decoded data array
// rgFlag: output, decoded flag array

var c = rgData.length;
var prev = 1;
var idx = 0;
var sum = 0;

for(var i = 0; i < c; i++){
    var f = rgData[i]&1;
    if(prev==0 && f==1){
        for(var j = idx; j < i; j++){
            rgValue[j] = hzRate/sum*3600;
            rgFlag[j] = 1;
        }
        idx = i;
        sum = 0;
    }
    prev = f;
    sum++;
}