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'use strict';
const serial = {
isWebUsbSupported: () => 'usb' in navigator,
// Returns array of connected devices wrapped as serial.Port instances
async getPorts() {
const devices = await navigator.usb.getDevices();
return devices.map(device => new serial.Port(device));
},
// Prompts user to select a device matching filters and wraps it in serial.Port
async requestPort() {
const filters = [
{ vendorId: 0xcafe }, // TinyUSB
{ vendorId: 0x239a }, // Adafruit
{ vendorId: 0x2e8a }, // Raspberry Pi
{ vendorId: 0x303a }, // Espressif
{ vendorId: 0x2341 }, // Arduino
];
const device = await navigator.usb.requestDevice({ filters });
return new serial.Port(device);
},
Port: class {
constructor(device) {
this.device = device;
this.interfaceNumber = 0;
this.endpointIn = 0;
this.endpointOut = 0;
this.readLoopActive = false;
}
portPointToSameDevice(port) {
if (this.device.vendorId !== port.device.vendorId) return false;
if (this.device.productId !== port.device.productId) return false;
if (this.device.serialNumber !== port.device.serialNumber) return false;
return true;
}
// Connect and start reading loop
async connect() {
await this.device.open();
if (!this.device.configuration) {
await this.device.selectConfiguration(1);
}
// Find interface with vendor-specific class (0xFF) and endpoints
for (const iface of this.device.configuration.interfaces) {
for (const alternate of iface.alternates) {
if (alternate.interfaceClass === 0xff) {
this.interfaceNumber = iface.interfaceNumber;
for (const endpoint of alternate.endpoints) {
if (endpoint.direction === 'out') this.endpointOut = endpoint.endpointNumber;
else if (endpoint.direction === 'in') this.endpointIn = endpoint.endpointNumber;
}
}
}
}
if (this.interfaceNumber === undefined) {
throw new Error('No suitable interface found.');
}
await this.device.claimInterface(this.interfaceNumber);
await this.device.selectAlternateInterface(this.interfaceNumber, 0);
// Set device to ENABLE (0x22 = SET_CONTROL_LINE_STATE, value 0x01 = activate)
await this.device.controlTransferOut({
requestType: 'class',
recipient: 'interface',
request: 0x22,
value: 0x01,
index: this.interfaceNumber,
});
this.readLoopActive = true;
this._readLoop();
}
// Internal continuous read loop
async _readLoop() {
while (this.readLoopActive) {
try {
const result = await this.device.transferIn(this.endpointIn, 64);
if (result.data && this.onReceive) {
this.onReceive(result.data);
}
} catch (error) {
this.readLoopActive = false;
if (this.onReceiveError) {
this.onReceiveError(error);
}
}
}
}
// Stop reading and release device
async disconnect() {
this.readLoopActive = false;
await this.device.controlTransferOut({
requestType: 'class',
recipient: 'interface',
request: 0x22,
value: 0x00,
index: this.interfaceNumber,
});
await this.device.close();
}
// Send data to device
send(data) {
return this.device.transferOut(this.endpointOut, data);
}
async forgetDevice() {
if (this.device.opened) {
await this.device.close();
}
await this.device.forget();
}
}
};
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