ral-registers - MMIO abstraction using a macro-based API

Age	Commit message (Collapse)	Author
2022-12-07	Add macro support for register arrays	Ian McIntyre
	I'm experimenting with a RAL code generator that collapses contiguous register arrays. The generated code would resemble pub struct RegisterBlock { pub MY_ARRAY: [RWRegister<u32>; 3], } and an individual register would be addressed like ral::read_reg!(ral::my_mod, my_inst, MY_ARRAY[1]); This commit extends the four macros so that we can specify an array offset. We simply need to match zero or more `[N]` patterns, where `N` is some expression that produces an array offset. The included test case shows that the approach should support multi-dimensional arrays.
2021-09-23	Prevent masking value variables with imports	Vadim Kaushan

2021-09-21	Mark all registers as transparent	Ian McIntyre
	Guarantees that the layout is the same as the inner type. Since UnsafeCell is also transparent, this ensures that the register has the same ABI as T. Today's registers work without this. Otherwise, RAL register blocks would have unaccounted offsets / wrong sizes. This is for completness, and a signal for others that a transmute might be OK. Requires Rust 1.28.
2021-08-15	Initial commit. Import `registers.rs` from stm32ral.	Adam Greig