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shared/tinyusb: Fix build errors with CDC support disabled. #17708

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@agatti agatti commented Jul 18, 2025

Summary

This PR makes it possible to build selected MicroPython ports that would have USB support enabled but CDC support disabled as well (whilst keeping MSC support for example).

The original code does support such a configuration but missed a few spots where build errors would arise. These changes fix the remaining issues, fixing also warnings caused by the changes needed to make the build succeed (like unused variables and so on).

Testing

This was checked by building the ESP32-S3 firmware with MICROPY_HW_USB_CDC set to 0, and then making sure the build process would succeed with that flag set back to 1. I also have another (unreleased) port where this behaviour was originally discovered and then fixed.

Trade-offs and Alternatives

There shouldn't be any impact, as these changes only affect a specific configuration whilst leaving the rest of the codebase as it is otherwise.

This commit makes possible building MicroPython with USB CDC support
disabled.

The original code does support such a configuration but missed a few
spots where build errors would arise.  These changes fix the remaining
issues, fixing also warnings caused by the changes needed to make the
build succeed.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>
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Code size report:

   bare-arm:    +0 +0.000% 
minimal x86:    +0 +0.000% 
   unix x64:    +0 +0.000% standard
      stm32:    +0 +0.000% PYBV10
     mimxrt:    +0 +0.000% TEENSY40
        rp2:    +0 +0.000% RPI_PICO_W
       samd:    +0 +0.000% ADAFRUIT_ITSYBITSY_M4_EXPRESS
  qemu rv32:    +0 +0.000% VIRT_RV32

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codecov bot commented Jul 18, 2025

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.44%. Comparing base (17fbc5a) to head (b5ec65d).

Additional details and impacted files
@@           Coverage Diff           @@
##           master   #17708   +/-   ##
=======================================
  Coverage   98.44%   98.44%           
=======================================
  Files         171      171           
  Lines       22208    22208           
=======================================
  Hits        21863    21863           
  Misses        345      345           

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