使用esp32c3的USB-JTAG调试系统，esp32c3的usb-cdc串口无法正常调试的原因？

## Environment

- Development Kit:  自制板卡

- Module or chip used:  安信可ESP-C3-13模组

- IDF version: ESP-IDF v4.4.1-dirty

- Build System:        idf.py

- Operating System:  在win10主机的vmware16中运行的Ubuntu 20.04.4 LTS

- Using an IDE?: No

- Power Supply:USB



## Problem Description

我最近在使用esp32c3的USB-JTAG调试系统,却发现esp32c3的usb-cdc串口可以正常工作，但却无法正常调试。经我排查发现，发现系统可能就只加载了usb串口设备，没有加载USB-JTAG设备。


## Debug Logs



使用openocd 调试esp32c3 使用 USB-JATG，发生以下错误，没有找到JATG设备

```cjia@cjia-com:~$ openocd -f board/esp32c3-builtin.cfg

Open On-Chip Debugger  v0.11.0-esp32-20211220 (2021-12-20-15:42)

Licensed under GNU GPL v2

For bug reports, read

Info : only one transport option; autoselect 'jtag'

Info : esp_usb_jtag: VID set to 0x303a and PID to 0x1001

Info : esp_usb_jtag: capabilities descriptor set to 0x2000

Warn : Transport "jtag" was already selected

Info : Listening on port 6666 for tcl connections

Info : Listening on port 4444 for telnet connections

Error: libusb_open() failed with LIBUSB_ERROR_ACCESS

Error: esp_usb_jtag: could not find or open device!

```

这是 lsusb ，发现可以找到Espressif USB JTAG/serial debug unit




- 这是系统日志

[系统日志.txt](https://github.com/espressif/esp-idf/fi ... efault.txt)



我截取了一些你们可能感兴趣的部分

```

[    2.177982] usb 3-2: new full-speed USB device number 3 using xhci_hcd

[    2.541285] usb 3-2: New USB device found, idVendor=303a, idProduct=1001, bcdDevice= 1.01

[    2.541291] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3

[    2.541292] usb 3-2: Product: USB JTAG/serial debug unit

[    2.541293] usb 3-2: Manufacturer: Espressif

[    2.541295] usb 3-2: SerialNumber: 84:F7:03:54:55:E8



[  545.584525] usb 3-2: USB disconnect, device number 3

[  560.656569] usb 3-2: new full-speed USB device number 6 using xhci_hcd

[  561.010461] usb 3-2: New USB device found, idVendor=303a, idProduct=1001, bcdDevice= 1.01

[  561.010467] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3

[  561.010468] usb 3-2: Product: USB JTAG/serial debug unit

[  561.010469] usb 3-2: Manufacturer: Espressif

[  561.010471] usb 3-2: SerialNumber: 84:F7:03:54:55:E8

[  561.016525] cdc_acm 3-2:1.0: ttyACM0: USB ACM device

```

我发现似乎只加载了USB ACM device