esp-idf/examples/peripherals/usb/tusb_serial_device

Supported Targets	ESP32-S2	ESP32-S3

TinyUSB Sample Descriptor

(See the README.md file in the upper level 'examples' directory for more information about examples.)

This example shows how to set up ESP chip to work as a USB Serial Device.

As a USB stack, a TinyUSB component is used.

How to use example

Hardware Required

Any ESP boards that have USB-OTG supported.

Pin Assignment

See common pin assignments for USB Device examples from upper level.

Build and Flash

Build the project and flash it to the board, then run monitor tool to view serial output:

idf.py -p PORT flash monitor

(Replace PORT with the name of the serial port to use.)

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

After the flashing you should see the output:

I (285) example: USB initialization
I (285) tusb_desc:
┌─────────────────────────────────┐
│  USB Device Descriptor Summary  │
├───────────────────┬─────────────┤
│bDeviceClass       │ 239         │
├───────────────────┼─────────────┤
│bDeviceSubClass    │ 2           │
├───────────────────┼─────────────┤
│bDeviceProtocol    │ 1           │
├───────────────────┼─────────────┤
│bMaxPacketSize0    │ 64          │
├───────────────────┼─────────────┤
│idVendor           │ 0x303a      │
├───────────────────┼─────────────┤
│idProduct          │ 0x4001      │
├───────────────────┼─────────────┤
│bcdDevice          │ 0x100       │
├───────────────────┼─────────────┤
│iManufacturer      │ 0x1         │
├───────────────────┼─────────────┤
│iProduct           │ 0x2         │
├───────────────────┼─────────────┤
│iSerialNumber      │ 0x3         │
├───────────────────┼─────────────┤
│bNumConfigurations │ 0x1         │
└───────────────────┴─────────────┘
I (455) TinyUSB: TinyUSB Driver installed
I (465) example: USB initialization DONE

Connect to the serial port (e.g. on Linux, it should be /dev/ttyACM0) by any terminal application (e.g. picocom /dev/ttyACM0), typing a string "espressif" and you will get the exactly same string returned.

The monitor tool will also print the communication process:

I (146186) example: Line state changed! dtr:1, rst:1
I (147936) example: Got data (1 bytes): e
I (148136) example: Got data (1 bytes): s
I (148336) example: Got data (1 bytes): p
I (148416) example: Got data (1 bytes): r
I (148446) example: Got data (1 bytes): e
I (148676) example: Got data (1 bytes): s
I (148836) example: Got data (1 bytes): s
I (148956) example: Got data (1 bytes): i
I (149066) example: Got data (1 bytes): f