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The HID USB class needs device-specific information – currently, the
subclass and the protocol of the device, but also the report descriptors
and request handlers once we support these functions. Therefore, this
patch introduces the HidDevice trait that provides this data. It also
adds a Nitrokey struct that implements this trait for the Nitrokey Pro
device.
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The HID standard requires an interrupt_in endpoint that can be used to
send unrequested data from the device to the driver. This patch adds
the interrupt_in endpoint, although there is no code that will ever
write to it.
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We need several enums that map to a u8 value. This patch adds the
enum_u8 macro that automatically derives the From and TryFrom macros for
an enum to make these conversions easier.
As TryFrom is not stable yet, we add our own TryFrom trait.
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This patch adds the usb-device and stm32f103xx-usb crates that provide a
USB stack. It introduces the HidClass struct, a basic implementation of
the Human Interface Device (HID) USB class. Devices with that class are
recognized as HID devices with the specified vendor and product ID, but
do not provide the endpoints required for interaction.
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