jsanchez-2g opened a new pull request, #19903:
URL: https://github.com/apache/nuttx/pull/19903
## Summary
Fix four defects in the shared STM32 M0 USB device driver:
- Correct packet memory area addressing. The M0 PMA is a linear 16-bit
memory, but the driver used STM32F1-style offset scaling and 32-bit
descriptor accesses.
- Route endpoint 0 correct-transfer events to the control-endpoint handler
instead of the generic endpoint handler.
- Enable and acknowledge USB controller error and PMA-overrun interrupts.
- Issue the correct USB peripheral reset pulse in arm_usbinitialize().
The combined defects prevented correct control transfers and USB enumeration
on
STM32 M0 USB device parts.
## Impact
- New feature added: NO. Bug fixes only.
- User adaptation required: NO.
- Build impact: NO.
- Hardware impact: YES. The driver is shared by STM32 F0, L0, G0, C0, and
related M0 USB device implementations.
- Documentation update required: NO.
- Security impact: NO.
- Compatibility impact: Existing working configurations retain the same
public
API and behavior; broken USB device paths become functional.
## Testing
Build host:
- Linux 6.18.33.2-microsoft-standard-WSL2
- arm-none-eabi-gcc 13.2.1
Hardware:
- ST NUCLEO-F072RB
- ST NUCLEO-L073RZ
Before:
- Both board USB-device configurations built but failed to enumerate as USB
devices when tested from pristine apache/master plus board support.
After:
- NUCLEO-F072RB: build, flash, NSH on USART2, and USB CDC/ACM enumeration
pass.
- NUCLEO-L073RZ: build, flash, NSH on USART2, and USB CDC/ACM enumeration
pass.
Validation:
- ./tools/checkpatch.sh -g apache/master...usb/m0-driver-fixes
- File-mode checkpatch passed for all changed files.
- Clean-room build and hardware test passed with matching upstream NuttX
Apps.
## PR verification Self-Check
- [x] This PR introduces one functional area: STM32 M0 USB device driver
fixes.
- [x] All commits include a description, Signed-off-by, and Assisted-by
trailers.
- [x] Source passes checkpatch.
- [x] Real hardware build and runtime testing was completed.
- [x] This PR is ready for review.
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