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

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

• 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.

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

MIT OR Apache-2.0