jsanchez-2g opened a new pull request, #19909:
URL: https://github.com/apache/nuttx/pull/19909
## Summary
The STM32F072RB provides a full speed USB device controller, but the
Nucleo-F072RB board support did not enable it and no configuration exercised
it.
This adds:
- USB device pin definitions in the STM32F07x pin map.
- HSI48 as the 48MHz source with USB SOF as the CRS synchronisation event,
which is the intended crystal-less USB configuration for this part.
- Board level D+ pull-up control and CDC/ACM registration at boot.
- A usb-cdc-uart configuration presenting NSH on USART2 and a CDC/ACM serial
device on USB.
- The USB device pins enabled in the nsh configuration for consistency.
The driver and clock fixes this depends on are already merged in master.
## Impact
- New feature added: YES. A new usb-cdc-uart configuration for this board.
- Impact on user: NO. Existing configurations are unchanged.
- Impact on build: NO.
- Impact on hardware: YES. Nucleo-F072RB board support and the STM32F07x pin
map.
- Impact on documentation: YES. Included in this PR.
- Impact on security: NO.
- Impact on compatibility: NO.
## Testing
Build Host: Linux 6.18.33.2-microsoft-standard-WSL2, arm-none-eabi-gcc 13.2.1
Target: arm, nucleo-f072rb:usb-cdc-uart, paired with current nuttx-apps
master
Testing logs before change:
No USB configuration existed for this board; the USB device controller
was
never enabled.
Testing logs after change:
NuttShell (NSH) on USART2 via the ST-LINK virtual COM port
Device enumerates on the host as a USB CDC/ACM serial port
Validation:
./tools/checkpatch.sh -g master...usb/nucleo-f072rb-cdc -> all checks
pass
Clean checkout build and on-target flash/run verified.
## PR verification Self-Check
* [x] This PR introduces only one functional change.
* [x] I have updated all required description fields above.
* [x] My PR adheres to Contributing Guidelines and Documentation.
* [ ] My PR is still work in progress.
* [x] My PR is ready for review and can be safely merged into a codebase.
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