stbenn opened a new pull request, #14813:
URL: https://github.com/apache/nuttx/pull/14813
The PLL clock configuration was simplified on the assumption the clocks are
correctly set in the board.h file. Instead of seperate conditions for register
components, assume the relevant PLL registers are fully defined in board.h.
This should result in easier to understand defines in board.h and simpler code
flow in the standard clock configuration function.
Changes were mad in the board file alongside changing the arch files.
Changes to board/stm32h5:
- PLL1 has been configured to use integer instead of fractional mode to
reach the 250 MHz target. PLL2 and PLL3 configurations were removed since they
are currently unused in the H5 configuration.
- PLL1 output was verified by testing for changes in serial baud rate.
*Note: Please adhere to [Contributing
Guidelines](https://github.com/apache/nuttx/blob/master/CONTRIBUTING.md).*
## Summary
This change is primarily to make it easier to configure PLL clocks when
working with peripherals. It followed the H7 `board.h` practice of fully
defining each register.
## Impact
This makes PLL clock setup easier in `board.h`, and will make it easier for
peripherals to be configured based off the PLL configuration. This change
continues to assume clocks must be set up properly in `board.h`
## Testing
Changes in the system clock would be detected by a change in baud rate on
the serial com port. After the changes, the serial com port continued to work
at the intended baud rate and the board booted to the nutshell.
Host OS: Ubuntu 24.04 on WSL 2 (Windows 11)
Compiler: arm-none-eabi-gcc (15:13.2.rel1-2) 13.2.1 20231009
Target:
- Arch: STM32H5
- Chip: STM32H563ZIT6U
- Board: Nucleo-H563ZI
- Config: nucleo-h563zi:nsh
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