serde_can

#+title: Serialize & Deserialize CAN message with serde

• Wire format Wire format is modified from [[https://postcard.jamesmunns.com/][postcard]] to better work with 8 byte length limitation of CAN message. ** Tagged Union See "Tagged Unions" part description of postcard wire specification, only different is we store the tag use only 4 bits. ** Serde Data Model Types *** bool store as 1 bit, =false= as =0=, =true= as =1=. *** i8/u8 store as 1 byte, 8 bits. *** i16/u16 store as 2 bytes, 16 bits, big endian. *** i32/u32 store as 4 bytes, 32 bits, big endian. *** i64/u64 store as 8 bytes, 64 bits, big endian. *** i128/u128 not support. *** f32 store as 4 bytes. *** f64 store as 8 bytes. *** char as string *** string encoded with 4 bit length, followed by array of bytes. *** byte array same as string. *** option =None= encoded as 1 bit =0=, =Some= encoded as 1 bit =1= followed by actual value inside. *** unit does not encoded to the wire. *** unit_struct same as =unit=. *** uint_variant a instance of =Tagged Union=, with 4 bit tag. *** newtype_struct encoded as the actual data it contains. *** newtype_variant a instance of =Tagged Union=, with 4 bit tag. *** seq 4 bit length of seq follwed by encoded array elements. *** tuple encoded as element inside tuple, in left to right order *** tuple_struct encoded as =tuple=. *** tuple_variant a instance of =Tagged Union= with 4 bit tag. *** map not support. *** struct same as =tuple=, only encode the element inside struct. *** struct_variant a inside of =Tagged Union= with 4 bit tag.