Bangle.js 2 Cutting Edge - new heart rate algorithm

This code can be used to view the data, might be useful. It is using analogRead from old method of reading pin directly instead of talk through i2c. Could be interesting to compare outputs. Pass hrm.raw into instead of val to c.onHRM to see difference. (You have to adjust graph constraints too, hrm.raw are huge numbers between 0 - 10000 ).
EDIT: It is using wrong pin (29), its not hrm data

var c = E.compiledC(`
  // void onHRM(int,int,int)

  const unsigned char windowSize = 25;

  typedef struct inputs {
    short * vals;
  } inputs_t;

  void onHRM(unsigned int &tick,int val,inputs_t *argss){
    argss->vals[tick % windowSize] = val;
    tick++;
  }
`);


let newUint32FlatArray = len => {
  let fs = E.toFlatString((new Uint32Array(len)).buffer);
  if ( !fs ) throw new Error("Required to be a flatstring");
  let obj = new Uint32Array(E.toArrayBuffer(fs));
  return {"obj" : obj, "ref" : E.getAddressOf(obj,true) };
};
let newInt16FlatArray = len => {
  let fs = E.toFlatString((new Int16Array(len)).buffer);
  if ( !fs ) throw new Error("Required to be a flatstring");
  let obj = new Int16Array(E.toArrayBuffer(fs));
  return {"obj" :  obj, "ref" : E.getAddressOf(obj,true) };
};

Bangle.setLCDPower(1);
Bangle.setHRMPower(1);
Bangle.setOptions({
  backlightTimeout:0,
  powerSave:false,
  hrmGreenAdjust: false
});
Bangle.setPollInterval(80);

let windowSize = 25;

var vals = newInt16FlatArray(windowSize);

var inputs = newUint32FlatArray(6);
inputs.obj[0] = vals.ref;

let tickFlat = newUint32FlatArray(1);
tickFlat.obj[0] = 0;
let tickCountOld = 0;

//This is called by idleLoop. Not an interrupt.
Bangle.on('HRM-raw', function(hrm) {

  let val = Math.round(analogRead(29)* 16383);
  c.onHRM(tickFlat.ref,val,inputs.ref);

});

//25Hz, Bangle.js 2
//50Hz, Bangle.js 1
setInterval(function hmm(){

    let tick = tickFlat.obj[0];
    tickCountOld = tick;

    g.clear(true);
    g.setFont("4x6:0.5");
  
    let nonCircVals = [];
    //circular to non-circular.
    for ( let i = 0; i < windowSize; i++ ) {
      nonCircVals.push(vals.obj[(tick + 1 + i) % windowSize]);
    }

    //black
    require("graph").drawLine(g, nonCircVals,{axes:false,miny:-50,maxy:50­,gridy:25});

},5000);