RTEMS | stm32h7-hal: Refactor clock and UART handling (!1156)

[Mohamed Ayman (@mohamedayman23)]

Mohamed Ayman created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1156

Project:Branches: mohamedayman23/rtems:fix-stm32h7-hal-potential-bugs to rtems/rtos/rtems:main
Author:   Mohamed Ayman



stm32h7-hal: Refactor clock and UART handling

- Introduce STM32H7_UART_TIMEOUT macro for polled UART operations.
- Refactor stm32h7_uart_polled_write to use defined timeout constant.
- Clean up stm32h7_gpio_init function and ensure type safety with RTEMS_DECONST.
- Organize peripheral clock enable/disable functions for clarity and bounds checking.
- Maintain consistent low-power clock handling for all modules.

AI usage: yes

Prompt used: explain this critical file and tell me the flow each function written by like give me the current function template and the enhanced one

AI model: gemini pro

How AI was used: for explaining the code to understand its tricks and flow and imoproving its sytle

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1156
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