meerstern.github.io/web_serial_I2C_Device_Search.html at main · meerstern/meerstern.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>I2C Device Search</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; }
			footer{ font-size:4pt; }
	</style>
  </head>
  <body>
	<h1><span>I2Cデバイスサーチツール </span></h1>
	<h2><span id="msg_string" >取得ボタンを押すと検索結果が表示されます</span></h2>
	<button id="connect-button" type="button" disabled>接続</button>
	<button id="search-button" type="button" disabled>検索</button>
	<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 Device Search 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 initButton = document.getElementById ('init-button');
	const getButton = document.getElementById ('search-button');

	let port;
	let keepReading = true;
	let reader;
	let dataIndex = 0;
	let str = "";
	let closed;
	let loop = 0;
	let loop2 = 0;
	let results = "";

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

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

        connectButton.innerText = '切断';
		getButton.disabled = false;
		//initButton.disabled = false;

		//Set Bus Timeout
		//initButton.addEventListener('click', (event) =>
		//{
	        //if (port && port.writable)
		//{
            	//const bytes = new Uint8Array([0x57, 0x09, 0x67, 0x50]);
            	//const writer = port.writable.getWriter();
            	//writer.write(bytes);
            	//writer.releaseLock();
		//console.log(bytes);
          	//}
        	//});


		//Search Button
		getButton.addEventListener('click', (event) =>
		{
          if (port && port.writable)
		  {
			getButton.disabled = true;
			//initButton.disabled = true;
			document.getElementById("msg_string").innerText = "No Device Found";
			const writer = port.writable.getWriter();
			console.log("Start Search");
			dataIndex=2;
			results="";
			for(loop=2;loop<255;loop=loop+2)
			{
				const bytes = new Uint8Array([0x53, loop, 0x01, 0x00, 0x53, loop+1, 0x01, 0x50, 0x52, 0x0A, 0x50]);
				writer.write(bytes);
				//console.log("Loop: "+ loop + " DATA:"+ bytes);
				Sleep(30);
			}
			console.log("End Search");
			getButton.disabled = false;
			//initButton.disabled = false;
            		writer.releaseLock();
          }
        });


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

					for(loop2=0;loop2<value.length;loop2=loop2+1)
					{
						if(value[loop2]==0xF0)
						{
							//console.log(value);
							var addr=dataIndex>>1;
							var raddr=dataIndex+1;
							var waddr=dataIndex;
							var str = "Found Device!! 7bit Addr: 0x" + addr.toString(16)
									+ ",  Write 8bit Addr: 0x" +waddr.toString(16)
									+ ",  Read 8bit Addr: 0x" +raddr.toString(16)+"\n";
							console.log(str);
							results = results + str;
							document.getElementById("msg_string").innerText = results;
							dataIndex=dataIndex+2;
						}
						else if(value[loop2]==0xF1)
						{
							dataIndex=dataIndex+2;
						}
					}

				}
			}
			catch (error)
			{
			}
			finally
			{
				reader.releaseLock();
				await port.close();
			}

		}

      }

	if ('serial' in navigator)
	{
		connectButton.addEventListener('click', async ()=>
		{
			if (port)
			{
				keepReading = false;
				connectButton.innerText = '接続';
				getButton.disabled = true;
				//initButton.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>