arch/stm32h7: add defines for USART clock selection #12845
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This adds the necessary defines to set the USARTs' kernel clock source selection. This is required for a configuration where the bootloader (running before NuttX) changes the USARTs' clock selection, so they need to be restored on board init. This is according to the reference manual RM0399 page 448.
This was referenced Aug 6, 2024
xiaoxiang781216
approved these changes
Aug 6, 2024
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Summary
This adds the necessary defines to set the USARTs' kernel clock source selection.
This is required for a configuration where the bootloader (running before NuttX) changes the USARTs' clock selection, so they need to be restored on board init.
This is according to the reference manual RM0399 page 448.
Impact
This should not have an impact unless the defines are actually set in the board config.
Testing
Tested downstream in PX4 using CubePilot CubeOrange+ with ArduPilot bootloader (which sets the clock).
Sponsored by CubePilot.
FYI @davids5