// 新增：存储全局串口和读取器实例
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let port = null;
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let reader = null;
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let accumulatedData = ""; // 移到全局，便于关闭时重置
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async function connect() {
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if ("serial" in navigator) {
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try {
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port = await navigator.serial.requestPort(); // 修改为全局变量
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await port.open({ baudRate: 9600 });
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reader = port.readable.getReader(); // 修改为全局变量
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const decoder = new TextDecoder();
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accumulatedData = ""; // 重置累积数据
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console.log("串口连接成功，开始接收数据...");
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while (true) {
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const { value, done } = await reader.read();
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if (done) break;
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const decodedChunk = decoder.decode(value, { stream: true });
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accumulatedData += decodedChunk;
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console.log("接收到数据块:", decodedChunk);
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processAccumulatedData(accumulatedData);
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}
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} catch (error) {
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console.error("串口错误:", error);
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}
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}
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function processAccumulatedData(data) {
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if (data.includes("\n")) {
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const messages = data.split("\n");
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for (let i = 0; i < messages.length - 1; i++) {
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const completeMessage = messages[i];
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console.log("完整消息:", completeMessage);
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handleMessage(completeMessage);
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}
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accumulatedData = messages[messages.length - 1];
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}
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// 其他消息拆分示例保持不变
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/*
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while (accumulatedData.length >= 32) {
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const message = accumulatedData.substring(0, 32);
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accumulatedData = accumulatedData.substring(32);
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handleMessage(message);
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}
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*/
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/*
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let startIndex = 0;
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while (true) {
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const start = accumulatedData.indexOf(0xAA, startIndex);
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if (start === -1) break;
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const end = accumulatedData.indexOf(0x55, start + 1);
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if (end === -1) break;
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const message = accumulatedData.substring(start, end + 1);
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accumulatedData = accumulatedData.substring(end + 1);
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handleMessage(message);
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startIndex = start;
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}
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*/
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}
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}
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// 新增：关闭连接函数
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async function disconnect() {
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if (!port || !reader) {
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console.log("未建立连接，无需关闭");
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return;
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}
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try {
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// 先取消读取器
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await reader.cancel();
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// 再关闭串口
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await port.close();
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console.log("串口连接已关闭");
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// 重置全局变量
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port = null;
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reader = null;
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accumulatedData = "";
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} catch (error) {
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console.error("关闭连接失败:", error);
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}
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}
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export { connect, disconnect };
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