stm32-ada/README.md

stm32-ada

Ada bindings for STM32 internals

Hardware quirks and workarounds

APB

APB does not support writes of parts of 32-bit registers. The library provides acess to register fields as records. This could lead compiler to emit byte and half-word writes to APB registers causing erroneous effects. As a workaround those registers should be read to local variable, this variable altered, and then written back to hardware. GNAT users may not need the workaround, because of its pragma Volatile_Full_Access used in this library.

Compiler specific notes

There are compiler-specific pragmas so your compiler may complain about them.

GNAT

Volatile_Full_Access pragma is used on (at least writable) APB registers as byte- and half-wide writes are not supported by APB. Read STM docs on what those accesses actually do.