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* Refactor command execution into commands moduleRobin Krahl2019-02-18
| | | | | | | | | | | | This patch refactors the command execution. A command is represented by a struct implementing the Command trait. The enum_cmd macro is used to generate a mapping from the CommandId enum to a Command instance and to execute the command. The request and response data is manually converted from and to raw byte slices. As we do not have a standard library, we cannot create a Box<Command> from a CommandId. Instead, we directly delegate the execute method to the corresponding Command.
* Add HidDevice trait for device-specific informationRobin Krahl2019-02-18
| | | | | | | | | 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.
* Add enum_u8 macro to simplify enum conversionRobin Krahl2019-02-18
| | | | | | | | 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.
* Add USB stack and simple HID implementationRobin Krahl2019-02-18
| | | | | | | | 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.
* Initial commitRobin Krahl2019-02-18