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calibration.htm
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<!DOCTYPE html>
<style>input[type=text]{width:20px}</style>
<pre id=webMidiSelect>No Connection</pre><br><br>
Synth Bend Range : <input id=pitchBendRange type=text value=3 oninput='window.bendRange=parseFloat(this.value)'><br><br>
<input type=button value='Toggle calibration mode' onclick='toggleCalibrationMode();'><br><br>
<div style="width:1024px;">
<input type=text value=-3 oninput='window.bend1=parseFloat(this.value)'>
<input type=text value=2 oninput='window.bend2=parseFloat(this.value)' style="float:right">
<br>
<canvas id=c width=1024 height=110 style='border:1px solid black;position:relative'></canvas>
<br>
<input type=text value=-1 oninput='window.bend3=parseFloat(this.value)'>
<input type=text value=-2 oninput='window.bend4=parseFloat(this.value)' style="float:right">
</div>
<pre id=raw></pre>
<pre id=json></pre>
<br><br>
<input type=button value=Calculate onclick='calculate()'>
<br><br>
<input type=button value='Write To Device' onclick='writeToDevice();'>
<script>
selectMIDI=document.getElementById("webMidiSelect");
document.querySelectorAll('input[oninput]').forEach(x=>x.oninput());
ADC0 = [190 , 480 , 577 , 834 ] ;
ADC1 = [184 , 499 , 542 , 844 ] ;
function calculate(){
voltages = [ ADC0[1], ADC0[2], ADC1[1], ADC1[2] ];
bendAmount=[];
limits=[];
//val1 sideways 190 - 480 - 577 - 834
//val2 lengthways 184 - 499 - 542 - 844
full = (1<<14);
semitone = full/2 /window.bendRange ;
bendAmount[0] = semitone * window.bend1 / (ADC0[1]-ADC0[0]); //-34.13333333333333;
bendAmount[1] =-semitone * window.bend2 / (ADC0[3]-ADC0[2]) ; // -22.755555555555553;
bendAmount[2] = semitone * window.bend3 / (ADC1[1]-ADC1[0]) ; // -9.416091954022988;
bendAmount[3] =-semitone * window.bend4 / (ADC1[3]-ADC1[2]) ; // 19.504761904761903;
limits[0] = Math.round(semitone * window.bend1);
limits[1] = Math.round(semitone * window.bend2);
limits[2] = Math.round(semitone * window.bend3);
limits[3] = Math.round(semitone * window.bend4);
eep=[];
eep = eep.concat( dec_to_IEEE754(bendAmount[0]), dec_to_IEEE754(bendAmount[1]), dec_to_IEEE754(bendAmount[2]), dec_to_IEEE754(bendAmount[3]) )
eep = eep.concat( int16_t(voltages[0]), int16_t(voltages[1]), int16_t(voltages[2]), int16_t(voltages[3]) )
eep = eep.concat( int16_t(limits[0]), int16_t(limits[1]), int16_t(limits[2]), int16_t(limits[3]) )
//json.innerHTML = 'ADC0 = '+JSON.stringify(ADC0)+' ; ADC1 = '+JSON.stringify(ADC1)+' ;';
hex="";
for (i=0;i<eep.length;i++) hex+=("0"+eep[i].toString(16).toUpperCase()).substr(-2)+" ";
json.innerHTML=hex + "\n" + JSON.stringify(bendAmount);
}
function writeToDevice(){
calculate();
sendSysEx(eep);
}
function int16_t(n){
if (n<0) n+=256*256
return [ n&0xFF, n>>8 ];
}
function dec_to_IEEE754(n){
sign = n<0?'1':'0'; n=Math.abs(n);
if (n<1) return;
left = Math.floor(n).toString(2).substring(1);
right = (n-Math.floor(n)).toString(2).substring(2);
exponent = (left.length +127).toString(2);
f = (sign + exponent + left + right + '000000000000000000000000');
var i=32;
while (f.substring(i,i+1) =='1' &&i) {
if (f.substring(i-1,i) =='0') {f=f.substring(0,i-1)+'1'+f.substring(i); break;}
else i--;
}
f=f.substring(0,32);
h = parseInt(f,2).toString(16).split('');
return [parseInt(h[6]+h[7],16), parseInt(h[4]+h[5],16), parseInt(h[2]+h[3],16), parseInt(h[0]+h[1],16) ]
}
raw=document.getElementById('raw');
json=document.getElementById('json');
c=document.getElementById('c');
ctx=c.getContext('2d');
ctx.textAlign="center";
function draw(v1,v2){
ctx.fillStyle='rgba(255,255,255,0.4)'
ctx.fillRect(0,0,1024,200);
ctx.fillStyle='rgb(100,100,100)'
ctx.strokeStyle='rgb(200,200,200)'
ctx.beginPath();
for (var i=0;i<1024;i+=8) {
ctx.moveTo(i+0.5,50),ctx.lineTo(i+0.5,55);
ctx.moveTo(i+0.5,22.5),ctx.lineTo(i+0.5,27.5);
ctx.moveTo(i+0.5,77.5),ctx.lineTo(i+0.5,82.5);
}
for (var i=0;i<1024;i+=64) {
ctx.moveTo(i+0.5,45),ctx.lineTo(i+0.5,55);
ctx.fillText(i,i,65);
}
ctx.fillText(i,i,65);
ctx.moveTo(0,55.5),ctx.lineTo(1024,55.5);
ctx.moveTo(0,27.5),ctx.lineTo(1024,27.5);
ctx.moveTo(0,82.5),ctx.lineTo(1024,82.5);
ctx.stroke();
ctx.fillStyle='rgba(40,40,40,1)'
drawDiamond(v1,27.5);
drawDiamond(v2,82.5);
ctx.fillStyle='rgba(255,255,0,0.1)'
ctx.fillRect(ADC0[0],0,ADC0[1]-ADC0[0],55);
ctx.fillRect(ADC0[2],0,ADC0[3]-ADC0[2],55);
ctx.fillRect(ADC1[0],55,ADC1[1]-ADC1[0],110);
ctx.fillRect(ADC1[2],55,ADC1[3]-ADC1[2],110);
ctx.strokeStyle='rgb(128,128,0)'
ctx.beginPath()
for (var i=0;i<4;i++) {
ctx.moveTo(ADC0[i],0);ctx.lineTo(ADC0[i],55);
ctx.moveTo(ADC1[i],55);ctx.lineTo(ADC1[i],110);
}
ctx.stroke();
raw.innerHTML= v1 + " , " + v2;
}
function drawDiamond(x,y){
ctx.beginPath();
ctx.moveTo(x,y+10);
ctx.lineTo(x+10,y);
ctx.lineTo(x,y-10);
ctx.lineTo(x-10,y);
ctx.fill();
}
c.onmousedown=function(e){
var affect = e.offsetY>55? ADC1:ADC0;
var n=1500, d, nearest=0;
for (var i=0;i<4;i++) {
d = Math.abs(affect[i]-e.offsetX);
if (d<n) nearest=i, n=d;
}
if (n>64) return;
c.style.cursor='col-resize';
(c.onmousemove=function(e){
affect[nearest]=e.offsetX;
json.innerHTML = 'ADC0 = '+JSON.stringify(ADC0)+' ; ADC1 = '+JSON.stringify(ADC1)+' ;';
})(e);
c.onmouseout=c.onmouseup=function(){
c.onmousemove=null;
c.onmouseup=null;
c.onmouseout=null;
c.style.cursor='';
}
}
function midiMessageReceived(d){
if (d.data[0]==254) return; // active sense
if (d.data[0]==0xE0) drawTemp(d);
if (d.data[0]==0xE1) {val1 = ((d.data[2]<<7) + (d.data[1]));}
if (d.data[0]==0xE2) {val2 = ((d.data[2]<<7) + (d.data[1])); draw(val1,val2);}
}
drawTemp=function(d){ n=((d.data[2]<<7) + (d.data[1])); json.innerHTML = n + "("+((100*n/2**13)-100).toFixed(2)+"%)"};
midiOut=null;
midiIn=null;
function populateMIDIInSelect() {
selectMIDI.innerHTML='No connection';
midiOut=null;
midiIn=null;
midiAccess.outputs.forEach( function(i) {
if ("Mini Pitchbend Joystick"==i.name) {
midiOut=i;
selectMIDI.innerHTML="Connected: " + i.name;
}
});
midiAccess.inputs.forEach( function(i) {
if (midiOut && i.name == midiOut.name) midiIn=i;
});
if (midiIn) midiIn.onmidimessage = midiMessageReceived;
}
window.addEventListener("load",function() {
if (navigator.requestMIDIAccess) navigator.requestMIDIAccess({"sysex": true}).then( function(midi) {
midiAccess = midi;
(midi.onstatechange = populateMIDIInSelect)();
});
});
function sendSysEx( data ){
d = [ 0xF0, 0x12, 0x34 ]
for (var i=0;i<data.length;i+=2) {
d.push( (data[i]&0x80?1:0) + (data[i+1]&0x80?2:0) )
d.push( data[i]&0x7F )
d.push( data[i+1]&0x7F )
}
d.push(0xF7);
console.log(d);
midiOut.send( d );
}
function toggleCalibrationMode(){
midiOut.send( [ 0xF0, 0x12, 0x35, 0xF7 ] )
}
</script>
<br><br><br><br>
For instructions on how to use this tool, see <a href=https://mitxela.com/projects/tiny_joystick>here</a>.