2021-07-16 04:01:15 -04:00
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| Supported Targets | ESP32-S2 | ESP32-S3 |
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| ----------------- | -------- | -------- |
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# USB CDC-ACM Host Driver Example
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This example shows how to use the CDC-ACM Host Driver to allow an ESP chip to communicate with a USB CDC-ACM device.
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## How to use example
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### Hardware Required
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Two ESP boards that have USB-OTG supported. One will act as USB host and the other as USB device.
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Connect USB_D+, USB_D-, GND and +5V signals of USB host to USB device.
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#### Pin Assignment
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See common pin assignments for USB Device examples from [upper level](../../../README.md#common-pin-assignments).
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### Build and Flash
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2021-12-16 01:50:08 -05:00
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1. Build and flash [tusb_serial_device example](../../../device/tusb_serial_device) to USB device board.
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2021-07-16 04:01:15 -04:00
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2. Build this project and flash it to the USB host board, then run monitor tool to view serial output:
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```bash
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idf.py -p PORT flash monitor
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```
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(Replace PORT with the name of the serial port to use.)
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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After the flashing you should see the output at idf monitor:
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```
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I (256) USB-CDC: USB Host installed
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I (256) USB-CDC: Opening CDC ACM device 0x303A:0x4001
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CDC Header Descriptor:
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bcdCDC: 1.20
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CDC Call Descriptor:
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bmCapabilities: 0x00
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bDataInterface: 1
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CDC ACM Descriptor:
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bmCapabilities: 0x02
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CDC Union Descriptor:
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bControlInterface: 0
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bSubordinateInterface[0]: 1
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I (1666) USB-CDC: Data received
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I (1666) USB-CDC: 0x3ffc4c20 41 54 0d |AT.|
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I (2666) USB-CDC: Data received
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I (2666) USB-CDC: 0x3ffc4c20 41 54 2b 47 53 4e 0d |AT+GSN.|
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I (3666) USB-CDC: Setting up line coding
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I (3666) USB-CDC: Line Get: Rate: 115200, Stop bits: 0, Parity: 0, Databits: 8
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I (3666) USB-CDC: Line Set: Rate: 9600, Stop bits: 1, Parity: 1, Databits: 7
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I (3666) USB-CDC: Line Get: Rate: 9600, Stop bits: 1, Parity: 1, Databits: 7
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I (3676) Example finished successfully!
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...
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```
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