esp-idf/examples/peripherals/usb/README.md

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# USB-OTG Examples
See the [README.md](../README.md) file in the upper level [examples](../) directory for more information about examples.
## Common Pin Assignments
Pin assignment is only needed for ESP chips that have an USB-OTG peripheral.
If your board doesn't have a USB connector connected to the USB-OTG dedicated GPIOs, you may have to DIY a cable and connect **D+** and **D-** to the pins listed below.
```
ESP BOARD USB CONNECTOR (type A)
--
| || VCC
[USBPHY_DM_NUM] ------> | || D-
[USBPHY_DP_NUM] ------> | || D+
| || GND
--
```
Refer to `soc/usb_pins.h` to find the real GPIO number of **USBPHY_DP_NUM** and **USBPHY_DM_NUM**.
| | USB_DP | USB_DM |
| ----------- | ------ | ------ |
| ESP32-S2/S3 | GPIO20 | GPIO19 |