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Import prototype with command sending
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‎LICENSE

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The MIT License (MIT)
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Copyright (c) 2021 Danny Lin <[email protected]>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎fastboot.js

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let device = null;
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class UsbError extends Error {
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constructor(message) {
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super(message);
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this.name = this.constructor.name;
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}
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}
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async function connectFastboot() {
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device = await navigator.usb.requestDevice({
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filters: [
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{ vendorId: 0x18d1, productId: 0x4ee0 },
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],
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});
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console.log('dev', device);
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// Validate device
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let interface = device.configurations[0].interfaces[0].alternates[0];
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if (interface.endpoints.length != 2) {
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throw new UsbError('Interface has wrong number of endpoints');
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}
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if (interface.interfaceClass != 255 || interface.interfaceProtocol != 3 || interface.interfaceSubclass != 66) {
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throw new UsbError('Interface has wrong class, subclass, or protocol');
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}
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let epIn = null;
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let epOut = null;
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for (let endpoint of interface.endpoints) {
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console.log('check endpoint', endpoint)
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if (endpoint.type != 'bulk') {
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throw new UsbError('Interface endpoint is not bulk');
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}
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if (endpoint.direction == 'in') {
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if (epIn == null) {
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epIn = endpoint.endpointNumber;
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} else {
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throw new UsbError('Interface has multiple IN endpoints');
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}
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} else if (endpoint.direction == 'out') {
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if (epOut == null) {
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epOut = endpoint.endpointNumber;
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} else {
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throw new UsbError('Interface has multiple OUT endpoints');
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}
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}
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}
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console.log('eps: in', epIn, 'out', epOut);
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await device.open();
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await device.reset();
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await device.selectConfiguration(1);
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await device.claimInterface(0); // fastboot
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}
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async function sendCommand(device, command) {
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if (command.length > 64) {
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throw new RangeError();
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}
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let cmdPacket = new TextEncoder('utf-8').encode(command);
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await device.transferOut(0x01, cmdPacket);
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let returnStr = ''
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let response;
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do {
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let respPacket = await device.transferIn(0x01, 64);
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console.log('resppacket', respPacket)
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response = new TextDecoder().decode(respPacket.data);
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console.log('resppacket', respPacket, 'resp', response);
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if (response.startsWith('OKAY')) {
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returnStr += response.substring(4);
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} else {
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returnStr += `[${response.substring(0, 4)}]: ${response.substring(4)}\n`;
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}
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} while (response.startsWith('INFO'));
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return returnStr;
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}

‎index.html

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<!DOCTYPE html>
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<html>
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<head>
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<title>fastboot.js demo</title>
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<script src="fastboot.js"></script>
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<script src="ui.js"></script>
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</head>
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<body>
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<div>
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<p>Status: <span class="status-field">Not connected</span></p>
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<button onclick="connectDevice();">Connect device</button>
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</div>
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<hr/>
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<div>
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<form class="command-form">
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<label for="command">Command:</label>
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<input type="text" name="command" class="command-input">
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<input type="submit" value="Send">
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</form>
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<p>Result:</p>
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<pre class="result-field"></pre>
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</div>
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<script>
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document.querySelector('.command-form').addEventListener('submit', sendFormCommand);
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</script>
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</body>
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</html>

‎ui.js

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async function connectDevice() {
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let statusField = document.querySelector('.status-field');
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statusField.textContent = 'Connecting...';
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try {
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await connectFastboot();
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} catch (error) {
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statusField.textContent = `Failed to connect to device: ${error.message}`;
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return;
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}
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let product = await sendCommand(device, 'getvar:product');
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let serial = await sendCommand(device, 'getvar:serialno');
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let status = `Connected to ${product} (serial: ${serial})`;
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statusField.textContent = status;
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}
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async function _sendFormCommand() {
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let inputField = document.querySelector('.command-input');
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let command = inputField.value;
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let result = await sendCommand(device, command);
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document.querySelector('.result-field').textContent = result;
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inputField.value = '';
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}
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function sendFormCommand(event) {
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event.preventDefault();
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_sendFormCommand();
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return false;
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}

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