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| (Eine dazwischenliegende Version von einem anderen Benutzer wird nicht angezeigt) |
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| | <!-- be kind, this is just a test --> | | <!-- be kind, this is just a test --> |
| − | <script language="JavaScript">
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| − |
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| − | var form;
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| − |
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| − | var win_ubrr, fosc, baud;
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| − | var row, ubrr, err;
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| − |
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| − | function init()
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| − | {
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| − | form = document.forms["data"];
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| − |
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| − | form.fosc.value="1.000000";
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| − | }
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| − |
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| − | function round (x, n)
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| − | {
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| − | n = Math.pow (10, n);
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| − | x = Math.round (n*x)/n;
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| − | return x;
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| − | }
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| − |
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| − | function get_ubrr (baud, m)
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| − | {
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| − | var f = 1000000*fosc;
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| − | var ubrra, bauda, erra;
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| − | var ubrrb, baudb, errb;
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| − |
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| − | ubrr = f/(m*baud)-1;
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| − | ubrra = Math.floor (ubrr);
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| − | ubrrb = Math.ceil (ubrr);
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| − | bauda = f/(m*(ubrra+1));
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| − | baudb = f/(m*(ubrrb+1));
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| − | erra = bauda/baud-1;
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| − | errb = baudb/baud-1;
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| − |
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| − | if (Math.abs (erra) < Math.abs (errb))
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| − | {
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| − | err = erra;
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| − | ubrr = ubrra;
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| − | }
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| − | else
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| − | {
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| − | err = errb;
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| − | ubrr = ubrrb;
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| − | }
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| − |
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| − | err = round (err*100, 1);
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| − | if (ubrr >= 10)
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| − | ubrr += "=0x" + ubrr.toString(16);
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| − |
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| − | if (Math.abs (err) < 0.21)
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| − | {
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| − | err = "<b>"+err+"</b>";
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| − | ubrr = "<b>"+ubrr+"</b>";
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| − | }
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| − | else if (Math.abs (err) > 10)
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| − | {
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| − | err = "–";
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| − | ubrr = err;
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| − | }
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| − | }
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| − |
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| − | function get_row (baud)
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| − | {
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| − | var color = ((row & 1) == 0) ? "#ffffff" : "#f0f0ff";
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| − | var html = "<tr bgcolor=\""+color+"\">";
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| − | var baudstr = baud;
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| − | var ubrr0, err0;
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| − | var ubrr1, err1;
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| − |
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| − | row++;
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| − |
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| − | if (baud > 9600)
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| − | {
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| − | baudstr = "" + (baud / 1000) + "k";
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| − | }
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| − |
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| − | if (baud > 250000)
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| − | {
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| − | baudstr = "" + (baud / 1000000) + "M";
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| − | }
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| − |
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| − | get_ubrr (baud, 16);
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| − | ubrr0 = ubrr;
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| − | err0 = err;
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| − |
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| − | get_ubrr (baud, 8);
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| − | ubrr1 = ubrr;
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| − | err1 = err;
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| − |
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| − | html += "<td>"+baudstr+"</td>";
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| − | html += "<td align=\"center\">"+ubrr0+"</td>";
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| − | html += "<td align=\"center\">"+err0+"</td>";
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| − | html += "<td align=\"center\">"+ubrr1+"</td>";
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| − | html += "<td align=\"center\">"+err1+"</td>";
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| − | html += "</tr>\n";
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| − |
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| − | return html;
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| − | }
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| − |
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| − | function write_ubrr_table ()
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| − | {
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| − | var html = "<center>";
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| − | row = 0;
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| − |
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| − | html += "<table border=\"1\" cellspacing=\"0\" cellpadding=\"2\">\n";
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| − | html += "<tr><td rowspan=3><b>Baud<br>Rate<br>(bps)</b></td>";
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| − | html += "<td colspan=4 align=\"center\"><b>f<sub>osc</sub> = "+fosc+" MHz</b></td></tr>\n";
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| − | html += "<tr><td colspan=2 align=\"center\"><b>U2X = 0</b></td><td colspan=2 align=\"center\"><b>U2X = 1</b></td></tr>\n";
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| − | html += "<tr><td align=\"center\"><b>UBRR</b></td><td align=\"center\"><b>Error (%)</b></td>";
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| − | html += "<td align=\"center\"><b>UBRR</b></td><td align=\"center\"><b>Error (%)</b></td></tr>\n";
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| − | html += get_row (2400);
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| − | html += get_row (4800);
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| − | html += get_row (9600);
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| − | html += get_row (14400);
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| − | html += get_row (19200);
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| − | html += get_row (28800);
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| − | html += get_row (38400);
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| − | html += get_row (57600);
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| − | html += get_row (76800);
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| − | html += get_row (115200);
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| − | html += get_row (230400);
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| − | html += get_row (250000);
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| − | html += get_row (500000);
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| − | html += get_row (1000000);
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| − | html += "</table></center>\n";
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| − |
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| − | // alert (html);
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| − |
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| − | win_ubrr.document.writeln (html);
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| − | }
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| − |
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| − | function open_ubrr_window (val)
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| − | {
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| − | fosc = parseFloat (val);
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| − |
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| − | if (win_ubrr)
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| − | win_ubrr.close();
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| − | win_ubrr = window.open ("about:blank", "ubrr", "toolbar=no, menubar=no, width=400");
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| − | win_ubrr.focus();
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| − | win_ubrr.document.close();
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| − | // win_ubrr.document.open();
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| − | // win_ubrr.document.location.href = "about:blank";
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| − |
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| − | var html = "<html>\n";
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| − | html += "<head>\n"
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| − | html += "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=iso-8859-1\">\n";
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| − | html += "<meta name=\"Author\" content=\"Georg-Johann Lay\">\n";
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| − | html += "<title>ATMega8 Baudrate, fosc = "+fosc+" MHz</title>\n";
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| − | html += "</head>\n"
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| − | win_ubrr.document.writeln (html);
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| − |
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| − | html = "<body bgcolor=\"white\" text=\"black\">\n";
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| − | win_ubrr.document.writeln (html);
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| − | write_ubrr_table (fosc, baud);
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| − | html = "</body>\n";
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| − | html += "</html>\n";
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| − | win_ubrr.document.writeln (html);
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| − | win_ubrr.document.close();
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| − | }
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| − |
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| − | function write_freq_button (frq)
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| − | {
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| − | html = "<input type=submit onclick=\"open_ubrr_window("+frq+")\" SIZE=\"120\" VALUE=\" "+frq+" MHz \">";
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| − |
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| − | document.writeln (html);
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| − | }
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| − |
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| − |
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| − | </script>
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