Created
July 27, 2011 16:47
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Light based implementation of SPI in Javascript
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| <html> | |
| <head> | |
| <style> | |
| .flasher { | |
| font-weight: bold; | |
| text-align: center; | |
| color: #888888; | |
| width: 200px; | |
| height: 200px; | |
| background-color: black; | |
| float: left; | |
| -webkit-transform: translateZ(0); | |
| border-right-style:dotted; | |
| border-color:#888888; | |
| border-width:1px; | |
| } | |
| </style> | |
| <script type="text/javascript"> | |
| /* Copyright 2011, Tom Hayward <[email protected]>, MIT License */ | |
| var ms = 100, | |
| bytes = 0, | |
| leftblock = null, | |
| rightblock = null, | |
| statustext = null; | |
| function sendBit(bit) { | |
| // data on | |
| if (bit) { | |
| rightblock.style.backgroundColor = 'white'; | |
| } | |
| else { | |
| rightblock.style.backgroundColor = 'black'; | |
| } | |
| // clock on | |
| leftblock.style.backgroundColor = 'white'; | |
| setTimeout(function() { | |
| // clock off, data off | |
| leftblock.style.backgroundColor = 'black'; | |
| rightblock.style.backgroundColor = 'black'; | |
| }, ms); | |
| } | |
| function sendByte(byte) { | |
| var bits = 8; | |
| setTimeout(function() { | |
| var timer = setInterval(function() { | |
| bits--; | |
| //console.log(byte >> bits & 1); | |
| sendBit(byte >> bits & 1); | |
| if (bits == 0) { | |
| clearInterval(timer); | |
| return; | |
| } | |
| }, ms * 2); | |
| }, ms * 2 * bits * bytes++); | |
| } | |
| function sendData() { | |
| var button = document.getElementById('sendnow'), | |
| byte1 = parseInt(document.getElementById('b1').value), | |
| byte2 = parseInt(document.getElementById('b2').value), | |
| checksum = byte1 ^ byte2; | |
| leftblock = document.getElementById('leftblock'); | |
| rightblock = document.getElementById('rightblock'); | |
| statustext = document.getElementById('status'); | |
| bytes = 0; // reset byte counter | |
| document.getElementById('b3').value = checksum; | |
| button.disabled = true; | |
| statustext.innerHTML = "Writing data..."; | |
| sendByte(byte1); | |
| sendByte(byte2); | |
| sendByte(checksum); | |
| setTimeout(function() { | |
| statustext.innerHTML = "done"; | |
| button.disabled = false; | |
| }, ms * 2 * 8 * bytes); | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <h1>PC/MCU Flasher Interface</h1> | |
| <code> | |
| Byte 1: <input id="b1" type="text" name="b1" size="3" value="255" /> <br> | |
| Byte 2: <input id="b2" type="text" name="b2" size="3" value="0" /> <br> | |
| CHKsum: <input id="b3" type="text" name="b3" size="3" value="" disabled="disabled" /> <br> | |
| <br> | |
| <input id="sendnow" type="button" value="SEND NOW" onClick="javascript:sendData();" /> | |
| <br><br><br> | |
| <p>Status: <span id="status"></span></p> | |
| </code> | |
| <div id="leftblock" class="flasher"> CLOCK</div> | |
| <div id="rightblock" class="flasher"> DATA</div> | |
| </body> | |
| </html> |
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