|
| 1 | +// 获取页面元素 |
| 2 | +const connectButton = document.getElementById("connectButton"); |
| 3 | +const disconnectButton = document.getElementById("disconnectButton"); |
| 4 | +const receivedText = document.getElementById("receivedText"); |
| 5 | +const sendText = document.getElementById("sendText"); |
| 6 | +const sendButton = document.getElementById("sendButton"); |
| 7 | + |
| 8 | +let port; |
| 9 | +let reader; |
| 10 | +// 循环读取串口数据 |
| 11 | +async function readLoop(reader) { |
| 12 | + try { |
| 13 | + while (true && port.open) { |
| 14 | + const { value, done } = await reader.read(); |
| 15 | + if (done) { |
| 16 | + console.log("Read operation done"); |
| 17 | + reader.releaseLock(); |
| 18 | + break; |
| 19 | + } |
| 20 | + if (value) { |
| 21 | + const decoder = new TextDecoder(); |
| 22 | + console.log("Received data:", decoder.decode(value)); |
| 23 | + receivedText.value += decoder.decode(value); |
| 24 | + } |
| 25 | + } |
| 26 | + } catch (err) { |
| 27 | + console.log("Error reading from serial port:", err); |
| 28 | + // port.onFail(); |
| 29 | + } finally { |
| 30 | + reader.releaseLock(); |
| 31 | + // return; |
| 32 | + } |
| 33 | + console.log("这里是不是又退出了一次"); |
| 34 | + // port.close(); |
| 35 | +} |
| 36 | + |
| 37 | +// 连接到串口设备 |
| 38 | +connectButton.addEventListener("click", async () => { |
| 39 | + try { |
| 40 | + port = await navigator.serial.requestPort(); |
| 41 | + await port.open({ baudRate: 9600 }); // 设置波特率 |
| 42 | + |
| 43 | + connectButton.disabled = true; |
| 44 | + disconnectButton.disabled = false; |
| 45 | + // port.onSuccess(); |
| 46 | + // 监听串口数据 |
| 47 | + reader = port.readable.getReader(); |
| 48 | + readLoop(reader); |
| 49 | + } catch (err) { |
| 50 | + console.error("没有选择打开串口号:", err); |
| 51 | + } finally { |
| 52 | + console.log("串口打开成功"); |
| 53 | + } |
| 54 | +}); |
| 55 | + |
| 56 | +// 停止读取操作 |
| 57 | +async function stopReading() { |
| 58 | + try { |
| 59 | + if (port && port.readable) { |
| 60 | + if (reader) { |
| 61 | + reader.releaseLock(); |
| 62 | + reader = null; |
| 63 | + } |
| 64 | + await port.readableStreamClosed; |
| 65 | + await port.readable.cancel(); |
| 66 | + |
| 67 | + console.log("Read operation cancelled successfully."); |
| 68 | + } |
| 69 | + } catch (error) { |
| 70 | + console.error("Error stopping reading:", error); |
| 71 | + } |
| 72 | +} |
| 73 | +// 关闭串口连接 |
| 74 | +async function closePort() { |
| 75 | + if (port && port.readable) { |
| 76 | + await stopReading(); // 停止读取操作 |
| 77 | + if (port && port.readable) { |
| 78 | + try { |
| 79 | + // 检查读取器和写入器是否已关闭 |
| 80 | + // if ( |
| 81 | + // port.readable.getReader().closed && |
| 82 | + // port.writable.getWriter().closed |
| 83 | + // ) { |
| 84 | + // console.log("Reader and writer are both closed"); |
| 85 | + // } |
| 86 | + await port.close(); |
| 87 | + console.log("Port closed successfully!"); |
| 88 | + // 清除事件监听器 |
| 89 | + port.onReceive = null; |
| 90 | + port.onDataReceived = null; |
| 91 | + port.onError = null; |
| 92 | + connectButton.disabled = false; |
| 93 | + disconnectButton.disabled = true; |
| 94 | + } catch (error) { |
| 95 | + console.error("Error closing port:", error); |
| 96 | + } |
| 97 | + } |
| 98 | + } else { |
| 99 | + console.warn("Port is not open or not readable."); |
| 100 | + } |
| 101 | +} |
| 102 | +disconnectButton.addEventListener("click", closePort); |
| 103 | + |
| 104 | +// 发送数据到串口 |
| 105 | +sendButton.addEventListener("click", async () => { |
| 106 | + if (port && port.writable) { |
| 107 | + const writer = port.writable.getWriter(); |
| 108 | + const encoder = new TextEncoder(); |
| 109 | + const data = encoder.encode(sendText.value + "\n"); |
| 110 | + try { |
| 111 | + // 使用 writer 的 write 方法发送数据 |
| 112 | + await writer.write(data); |
| 113 | + console.log("Data sent successfully"); |
| 114 | + } catch (error) { |
| 115 | + console.error("Error sending data:", error); |
| 116 | + } finally { |
| 117 | + // 发送完成后，你可能需要释放 writer |
| 118 | + writer.releaseLock(); |
| 119 | + } |
| 120 | + } |
| 121 | +}); |
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