meerstern.github.io/web_serial_I2C_ReadWrite.html at main · meerstern/meerstern.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>I2C Read/Write</title>
	<style>
			h1 { font-size:20pt; background-color:#4F4F4F; color:#FFFFFF; font-weight : normal;}
			h2 { font-size:12pt; }
			h3 { font-size:8pt; }
			body { font-size:12pt; color:#444444; }
			fieldset { font-size:12pt; line-height:0.1em; padding:  20px;}
			footer{ font-size:4pt; }
	</style>
  </head>
  <body>
	<h1><span>I2C Read/Writeテストツール </span></h1>
	<button id="connect-button" type="button" disabled>接続(Connect)</button>
	<br/>
	<br/>
	<fieldset>
	<legend>全般設定(Settings)</legend>
	<div>
	  <p>デバイスアドレス(Dev Addr)</p>
	  <input type="text" id="devAddr" name="devAddr"  placeholder="ex) 0x64 or 100"></p>
	</div>
	<div>
	  <p>デバイスアドレスサイズ(Addr Size)</p>
      <input type="radio" id="bit8" name="bitLen" value="bit8" onchange="bitChange();">
      <label for="bit8">8bit</label>
      <input type="radio" id="bit7" name="bitLen" value="bit7" checked onchange="bitChange();">
      <label for="bit7">7bit</label>
	</div>
	</fieldset>
	<br/>
	<fieldset>
	<legend>書込(Write)</legend>
	<div>
	  <p>レジスタ(Reg)</p>
	  <input type="text" id="writeReg" name="writeReg"  placeholder="ex) 0x31 or 49"></p>
	</div>
	<div>
	  <p>書込データ(Data)</p>
	  <input type="text" id="writeData" name="writeData"  placeholder="ex) 0x20,0x21・・・"></p>
	</div>
	<button id="write-button" type="button" disabled>書込(Write)</button>
	</fieldset>
	<br/>
	<fieldset>
	<legend>読込(Read)</legend>
	<div>
	  <p>レジスタ(Reg)</p>
	  <input type="text" id="readReg" name="readReg"  placeholder="ex) 0x31 or 49"></p>
	</div>
	<div>
	  <p>読込データサイズ(Size)</p>
	  <input type="text" id="readLen" name="readLen"  placeholder="ex) 0x10 or 16"></p>
	</div>
	<h2><span id="res_string" >読込値(Data)</span></h2>
	<button id="read-button" type="button" disabled>読込(Read)</button>
	<button id="clear-button" type="button">クリア(Clear)</button>
	</fieldset>

	<h3>
		<span>
		本ツールは<a href="https://www.switch-science.com/catalog/6214/">USBシリアルI2C変換基板</a>とブラウザでI2Cデバイスのテストをするツールです</span>
	</h3>
	<h3><span>オフラインやローカル環境でも動作可能です</span></h3>
	<h3><span>ブラウザはEdgeもしくはChromeのみ対応しています</span></h3>
	<footer>
	<p>Copyright (c) 2025 Crescent All Rights Reserved.</p>
	</footer>

	<script>
	/*	I2C Read Write Tool
	 *	Copyright (c) 2025
	 *  K.Watanabe,Crescent
	 *  Released under the MIT license
	 *  http://opensource.org/licenses/mit-license.php
	 */
	const connectButton = document.getElementById ('connect-button');
	const readButton = document.getElementById ('read-button');
	const writeButton = document.getElementById ('write-button');
	const clearButton = document.getElementById ('clear-button');
	const bit8 = document.getElementById("bit8");
	const devAddr = document.getElementById("devAddr");
	const wReg = document.getElementById("writeReg");
	const wData = document.getElementById("writeData");
	const rReg = document.getElementById("readReg");
	const rLen = document.getElementById("readLen");
	const rRes = document.getElementById("res_string");

	let port;
	let keepReading = true;
	let reader;
	let dataIndex = 0;
	let str = "";
	let closed;
	let dataArry = [];
	let Is8bitAddr=false;
	let intDevAddress=0;
	let wdataArry=[];
	let intWReg = 0;
	let intRReg = 0;
	let intRLen = 0;

	//Wait Function
	function Sleep( milli_second )
	{
		var start = new Date();
		while( new Date() - start < milli_second );
	}

	function bitChange()
	{
		if(bit8.checked==true)
			Is8bitAddr=true;
		else
			Is8bitAddr=false;
	}

	function setDeviceAddress()
	{
		if(devAddr.value!="")
		{
			if(devAddr.value[1]=="x")
				intDevAddress = parseInt(devAddr.value, 16);
			else
				intDevAddress = parseInt(devAddr.value, 10);

			if(Is8bitAddr==false)
				intDevAddress = intDevAddress<<1;
			else
				intDevAddress = intDevAddress&0xFE;
		}
		//console.log(intDevAddress);
	}

	function setWriteReg()
	{
		if(wReg.value!="")
		{
			if(wReg.value[1]=="x")
				intWReg=parseInt(wReg.value, 16);
			else
				intWReg=parseInt(wReg.value, 10);
		}
		//console.log(intWReg);
	}

	function setWriteData()
	{
		if(wData.value!="")
		{
			wdataArry=[];
			const itemData = wData.value.split(',');
			for(var i=0; i<itemData.length; i++)
			{
				if(itemData[i][1]=="x")
					wdataArry.push(parseInt(itemData[i], 16));
				else
					wdataArry.push(parseInt(itemData[i],10));
			}
			//console.log(wdataArry);
		}
	}

	function setReadReg()
	{
		if(rReg.value!="")
		{
			if(rReg.value[1]=="x")
				intRReg=parseInt(rReg.value, 16);
			else
				intRReg=parseInt(rReg.value, 10);
		}
		//console.log(intWReg);
	}

	function setReadLen()
	{
		if(rLen.value!="")
		{
			if(rLen.value[1]=="x")
				intRLen=parseInt(rLen.value, 16);
			else
				intRLen=parseInt(rLen.value, 10);
		}
		//console.log(intWReg);
	}

	//Clear Read Data
	clearButton.addEventListener('click', (event) =>
	{
		document.getElementById("res_string").innerText = "読込値(Read Value)";
	});


	//Com Open & Recieve Data
	async function getReader()
	{
        port = await navigator.serial.requestPort({});
        await port.open({ baudRate: 9600 });

        connectButton.innerText = '切断(Disconnect)';
		writeButton.disabled = false;
		readButton.disabled = false;

        //Write Button
		writeButton.addEventListener('click', (event) =>
		{
          if (port && port.writable)
		  {
            setDeviceAddress();
			setWriteReg();
			setWriteData();

			if(devAddr.value!="" && wReg.value!="" && wData.value!="")
			{
				const bytes1 = new Uint8Array([0x53, intDevAddress, wdataArry.length+1, intWReg]);
				const bytes2 = Uint8Array.from(wdataArry);
				const bytes3 = new Uint8Array([0x50]);
				const writer = port.writable.getWriter();
				writer.write(bytes1);
				Sleep(10);
				writer.write(bytes2);
				Sleep(10);
				writer.write(bytes3);
				writer.releaseLock();
			}
			else if(devAddr.value!="" && wData.value!="")
			{
				const bytes1 = new Uint8Array([0x53, intDevAddress, wdataArry.length]);
				const bytes2 = Uint8Array.from(wdataArry);
				const bytes3 = new Uint8Array([0x50]);
				const writer = port.writable.getWriter();
				writer.write(bytes1);
				Sleep(10);
				writer.write(bytes2);
				Sleep(10);
				writer.write(bytes3);
				writer.releaseLock();
			}
          }
        });

		//Read Button
		readButton.addEventListener('click', (event) =>
		{
          if (port && port.writable)
		  {
			if(devAddr.value!="" && rReg.value!="" && rLen.value!="")
			{
				setDeviceAddress();
				setReadReg();
				setReadLen();

				const bytes1 = new Uint8Array([0x53, intDevAddress, 0x01, intRReg, 0x53, intDevAddress+1, intRLen, 0x50]);
				const writer = port.writable.getWriter();
				dataArry=[];
				dataIndex=0;
				writer.write(bytes1);
				writer.releaseLock();
			}
			else if(devAddr.value!="" && rLen.value!="")
			{
				setDeviceAddress();
				setReadReg();
				setReadLen();

				const bytes1 = new Uint8Array([0x53, intDevAddress+1, intRLen, 0x50]);
				const writer = port.writable.getWriter();
				dataArry=[];
				dataIndex=0;
				writer.write(bytes1);
				writer.releaseLock();
			}
          }
        });


		while (port.readable && keepReading)
		{
			reader = port.readable.getReader();
			try {
				while (true)
				{
					const { value, done } = await reader.read();
					if (done)
					{
						reader.releaseLock();
						break;
					}

					if (value)
					{
						//console.log(value);
						dataArry[dataIndex] = " 0x"+value[0].toString(16);
						document.getElementById("res_string").innerText = dataArry;
						dataIndex = dataIndex+1;
					}
				}
			}
			catch (error)
			{
			}
			finally
			{
				reader.releaseLock();
				await port.close();
			}

		}

      }

	if ('serial' in navigator)
	{
		connectButton.addEventListener('click', async ()=>
		{
			if (port)
			{
				keepReading = false;
				connectButton.innerText = '接続(Connect)';
				readButton.disabled = true;
				writeButton.disabled = true;
				reader.cancel();
				await closed;
				port = undefined;
			}
			else
			{
				closed = getReader();
			}
		});
		connectButton.disabled = false;
	}
	else
	{
		alert('お使いのブラウザは対応していません Edgeもしくはchromeを使用してください');
	}
	</script>
  </body>
</html>