Add Host support for ch32v20x usbfs

[verylowfreq]

This PR adds HCD for WCH CH32V20x USBFS (USBOTG_FS).

The following issue will be closed:

• support wch ch32v/f full usb host #2613

CH32V20x has two USB peripheral; FSDEV and USBFS. In this PR, USBFS Host driver is enabled when PORT=0 (FSDEV is selected).

I tested on my original CH32V203C8T6 board "Suzuno32RV" (8MHz external crystal, Type-A connector is assigned for USBFS, Type-C connector is for FSDEV).
Please refer for schematic: https://github.com/verylowfreq/board_suzuno32rv

[hathach]

Thank you for your PR, can you pull/merge from master, which include a fix to circleci build.

[verylowfreq]

@hathach Thanks for reply. It seems that my branch is already up-to-date and I couldn't merge more commits. How can I do pull/merge?
My "pr-ch32v-usbfs-host" branch's commits:

[hathach]

sorry, my bad, previous master isn't fix that yet. I have fixed merged and also fixed the pre-commit format as well. It is all good now.

[verylowfreq]

Thank you. I found that the CI failed at macro related problem ("Build / cmake (riscv-gcc)"), so I added commits to solve it.

[hathach]

thank you, I am current working on other stuffs, please give me a bit of time to review this.

[verylowfreq]

@hathach Thank you for sharing your status! I'm preparing to release my Suzuno32RV MCU board, which I used for testing, and I'm also working on porting Adafruit_TinyUSB_Arduino.

My fork of Adafruit_TinyUSB_Arduino:
(Currently, copying ch32v20x_usb.h to arduino_core_ch32 folder is needed to build.)
https://github.com/verylowfreq/Adafruit_TinyUSB_Arduino

[mikeemoo]

Any chance we could get this reviewed and merged in?

[hathach]

this is always on my radar but still haven't manage time to review this.

[verylowfreq]

Merged the latest changes in master branch.

Current problems (and I need help):

• The communication to LowSpeed device via external HUB sometimes fails. (ex: cannot get the device descriptor, tuh_mount_cb() not called)
  • Plugging to the Root Port doesn't cause the problem with same device.
  • In my test, USB keyboards are often causing this problem.
• Plugging the external HUB sometimes causes the resetting MCU.

[hathach]

Thank you for the update and patient, sorry, I am stil busy with other works. Will check this out as soon as I could.

[braxlan]

@verylowfreq I'm glad you're working on this! If you need someone for tests, hit me up, I have a nanoCH32V203 which I can do tests with.

[braxlan]

I just wanted to bump this because there are already two people working on host support, see also #3094.

[hathach]

perfect, thank @verylowfreq very much for this great PR. Sorry for the delay, I have tested with simple host/device_info and dual/host_info_to_device_cdc and it can enumerate device just well. haven't done more in-depth testing. Any issues can be resolved as follow-up PR later.

I have made some changes

• always add CFG_TUH_WCH_USBIP_USBFS=1 by default for ch32v20x since that is the only port that support host mode. Manual setting it isn't required.

PS: CI failed due to hw connection issue in the hil pool. I will just ignore this for now.