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Update with PWM out at 27MHz

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cnlohr
2024-06-18 22:48:52 -07:00
parent a40b6adf55
commit 200d271c0a
2 changed files with 133 additions and 6 deletions
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ch32v/ch32v003-adcrx/calculator.html
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<!DOCTYPE html>
<HTML>
<HEAD>
<SCRIPT>
function DrawSpan( colspan, freq, target, docolor )
{
var fdist = Math.abs( freq - target );
fdist = Math.pow( fdist, 0.5 ) * 500;
// if( fdist > 255 ) fdist = 255;
let ret = "<TD COLSPAN=" + colspan + ' ';
if( docolor ) ret += 'STYLE="background-color:rgb(' + fdist + ',' + (511-fdist) + ',0)";';
ret += '>' + freq.toFixed(6) + "</TD>";
return ret;
}
function computeTable()
{
const max_harmonics = 28|0;
const min_harmonics = 1|0;
let xtal = Number(document.getElementById("crystalmhz").value );
let target = Number(document.getElementById("targetmhz").value );
let contents = "<TABLE BORDER=1>";
contents += '<TR><TH>d\\h</div></TH>';
for( let h = 0|min_harmonics; h <= max_harmonics; h++ )
{
contents += "<TH COLSPAN=2>" + h + "</TH>";
}
contents += "</TR>";
for( let n = 0|28; n <= 66; n++ )
{
for( let mode = 0; mode < 4; mode++ )
{
contents += "<TR>";
if( mode == 0 )
contents += "<TD ROWSPAN=4>" + n + "</TD>";
for( let h = 0|min_harmonics; h <= max_harmonics; h++ )
{
let freq = ( xtal / n );
if( mode == 0 )
contents += DrawSpan( 2, freq * h, target, false );
else if( mode == 1 )
contents += DrawSpan( 2, freq * (h-.25), target, true );
else if( mode == 2 )
contents += DrawSpan( 2, freq * (h+.25), target, true );
else if( mode == 3 )
contents += DrawSpan( 2, freq + (h+ 0.5), target, true );
}
contents += "</TD>";
}
}
contents += "</TABLE>";
document.getElementById( "TABLE" ).innerHTML = contents;
}
</SCRIPT>
</HEAD>
<BODY>
<p>Tool for computing tuning to specific frequencies by use of direct ADC reading at specific timer-controlled rate to "tune" to specific frequencies either by quadrature or differential.</p>
<TABLE>
<TR><TD>Crystal MHz</TD><TD><INPUT ID=crystalmhz VALUE=48></TD></TR>
<TR><TD>Target MHz</TD><TD><INPUT ID=targetmhz VALUE=27.1></TD></TR>
<TR><TD COLSPAN=2><INPUT TYPE=SUBMIT ONCLICK="computeTable()"></TD></TR>
</TABLE>
<TABLE>
<TR><TD>Quadrature:</TD></TR>
<TR><TD>I = + + - -</TD></TR>
<TR><TD>Q = + - - +</TD></TR>
<TR><TD>Differntial:</TD></TR>
<TR><TD>V = + - + -</TD></TR>
<TR><TD>You choose the mode you operate in, either Quadrature or differential</TD></TR>
</TABLE>
<p> Table shows: </P>
<TABLE BORDER=1>
<TR><TD>Sample Frequency Harmonic</TD></TR>
<TR><TD>Lower Quadrature Frequency</TD></TR>
<TR><TD>Upper Quadrature Frequency</TD></TR>
<TR><TD>Differential Frequency</TD></TR>
</TABLE>
<DIV ID=TABLE></DIV>
</BODY>
</HTML>