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This repository has been archived by the owner on Jan 2, 2024. It is now read-only.
Jared Boone edited this page Aug 15, 2015
·
2 revisions
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.