attemped from google

web/js-ts/serial.js

@@ -1,7 +1,29 @@
-let port;
-
-function setup() {
-    port = createSerial();
-    port.open(9600);
-
+"use strict";
+async function connect() {
+    const port = await navigator.serial.requestPort();
+    // - Wait for the port to open.
+    await port.open({ baudRate: 9600 });
+    let decoder = new TextDecoderStream();
+    const inputDone = port.readable.pipeTo(decoder.writable);
+    const inputStream = decoder.readable;
+    reader = inputStream.getReader();
+    await readLoop();
+}
+async function clickConnect() {
+    // CODELAB: Add connect code here.
+    await connect();
+}
+async function readLoop() {
+    // CODELAB: Add read loop here.
+    while (true) {
+        const { value, done } = await reader.read();
+        if (value) {
+            log.textContent += value + '\n';
+        }
+        if (done) {
+            console.log('[readLoop] DONE', done);
+            reader.releaseLock();
+            break;
+        }
+    }
 }