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Created ChibiOS Notes (markdown)

NotPike 2022-01-11 18:04:36 -05:00
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ChibiOS-Notes.md Normal file

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These are miscellaneous useful notes about how ChibiOS functions.
### Stacks Configuration
From ChibiOS crt0.c:
Two stacks available for Cortex-M, main stack or process stack.
* **Thread mode**: Used to execute application software. The processor enters Thread mode when it comes out of reset.
* **Handler mode**: Used to handle exceptions. The processor returns to Thread mode when it has finished all exception processing.
ChibiOS configures the Cortex-M in dual-stack mode. (CONTROL[1]=1)
When CONTROL[1]=1, PSP is used when the processor is in Thread mode.
MSP is always used when the processor is in Handler mode.
* **__main_stack_size__**: Used for exception handlers. Yes, really.
* **__process_stack_size__**: Used by main().
After chSysInit(), the current instructions stream (usually main())
becomes the main thread.
##
Original Wiki by sharebrained at [Operating System Notes](https://github.com/sharebrained/portapack-hackrf/wiki/Operating-System-Notes)