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dfu-core
========

Sans IO core library (traits and tools) for DFU.

Features
--------

 -  [x] `no_std` compatible
 -  [x] async and sync compatible
 -  [x] write a firmware into a device (DFU download)
 -  [ ] read a firmware from a device (DFU upload)
 -  [x] minimal dependencies
 -  [x] uses a state machine to ensure the implementations are correctly done

Traits & Structs
----------------

 -  `trait DfuIo`: a trait that can be made into an object that provides the IO
    to this library logic.
 -  `struct DfuSansIo`: a struct that allows the developer to do the DFU logic
    using a state machine (can be async or sync).
 -  `struct DfuSync`: a basic sync implementation that uses a `DfuIo` provided
    in argument during runtime.
 -  `type MemoryPage` and `type mem`: primitives representing the memory layout
    of the device (like `char` and `str`).
 -  `struct MemoryLayout`: (requires features `std`) an allocated
    representation of the memory layout (like `String`) that can parse a
    memory layout from a string.
 -  `FunctionalDescriptor`: can read the extra bytes of a USB functional
    descriptor to provide information for the DFU logic.

DFU Documentation
-----------------

This crate has been made based on the following specifications:

 *  DFU 1.1 (Aug 5 2004): https://www.usb.org/sites/default/files/DFU_1.1.pdf
 *  STM32/DfuSe extensions: https://www.st.com/content/ccc/resource/technical/document/user_manual/cc/6d/c3/43/ea/29/4b/eb/CD00135281.pdf/files/CD00135281.pdf/jcr:content/translations/en.CD00135281.pdf

License
-------

MIT OR Apache-2.0