<!DOCTYPE html>
<html>
  <head>
    <link rel="stylesheet" href="dygraph.css">
    <title>Get data INA219</title>
    <script type="text/javascript" src="dygraph.js"></script>

  </head>
  <body>
    <h3 style="width:800px; text-align: center;">Read regs U & I INA219</h3>
    <div id="div_g" style="width:800px; height:400px;"></div>
    <script type="text/javascript">
var data = [];
var g = new Dygraph(
	document.getElementById("div_g"), 
    data,
	{
		drawPoints: true,
		showRoller: true,
	labels: ['X', 'U', 'I']});
	
var oldblkid = 0;
var rdnextflg = false;
var cur_idx = 0;
ws = new WebSocket('ws://rtl871x0/web.cgi');
ws.binaryType = 'arraybuffer';
ws.onopen = function(){ws.send('ina219')};
ws.onmessage = function (event) {
	if(event.data instanceof ArrayBuffer) {
		var wordarray = new Int16Array(event.data);
		if(wordarray.length > 2) {
			var blksz = wordarray[0]; 
			if(wordarray.length == blksz*2 + 2) {
				var blkid = wordarray[1] & 0xFFFF;
				if(rdnextflg) {
					cur_idx += (blkid - oldblkid) & 0xFFFF;
				} else rdnextflg = true;
				oldblkid = blkid + blksz;
				for (var i=2; i<wordarray.length; i+=2) {
 					if(cur_idx > 2000 ) data.shift();
					data.push([cur_idx, wordarray[i], wordarray[i+1]*50]);
					cur_idx++;
				}
	 	 	    g.updateOptions({'file':data});
			}
		}
		ws.send("ina219");
	}
}
</script>
  </body>
</html>