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micropython/usb/usb-device/usb/device/core.py: Add alternate setting support plus a few fixes and improvements.#1031
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⦁Removed `import time` (not used)⦁Removed unused/duplicate `_Device.config` argument `config_str`⦁Fixed the loop reserving other string indexes used by built-in drivers `while len(strs) < builtin_driver.str_max:` to `while len(strs) < builtin\_driver.str\_max - 1:` (row 169)because str_max equals to one more than the highest string descriptor index value used by any built-in descriptor according to the [docs](https://docs.micropython.org/en/latest/library/machine.USBDevice.html) and added a comment that this loop is probably unnecessary or even wrong⦁Added `bAlternateSetting` as argument to `Descriptor.interface`, because it is used for USB MIDI 2.0⦁Some code optimisations
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Summary
bAlternateSettingas argument toDescriptor.interface, because it is used for USB MIDI 2.0while len(strs) < builtin_driver.str_max:towhile len(strs) < builtin\_driver.str\_max - 1:(row 169) becausestr_maxequals to one more than the highest string descriptor index value used by any built-in descriptor according to thedocs and added a comment that this loop is probably unnecessary or even wrongimport time(not used)_Device.configargumentconfig_strBufferclass)Testing
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