Tickless support #3
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…+ draft tickless API
…logic - Refactor tickless.c to improve scheduling and initialization, including new functions for scheduling and canceling tickless events. - Update timer.h and timer.c to support new timer modes and improve interrupt handling.
- Added new fault codes for Rust panic and timing-related faults in fault.h and fault.c. - Renamed ll_timer_clear_irq_flags to ll_timer_clear_all_irq_flags for clarity in timer.h. - Updated k_flags_notify to use z_early_wake_up instead of z_wake_up for thread notifications in flags.c. - Improved idle thread handling in idle.c with warnings for tickless mode. - Enhanced initialization sequence in init.c to include debug messages and GPIO state clearing. - Refactored kernel scheduling functions in kernel.c to improve clarity and maintainability, including renaming z_sched_enter to z_sched_point_enter. - Updated tickless scheduling functions in tickless.c to use ticks instead of milliseconds for better precision. - Introduced new tickless definitions in tickless_defs.h for better configuration management. - Added support for elapsed ticks measurement since the last tickless event. - Improved type definitions in types.h for better clarity and maintainability.
…ferences, add picture to illustrate the timings
* Fix ll_timer16_clear_irq_flag() function, only clear the flag if it is actually set in the TIFR register. * Problem remaing: It appears that we are missing SP if we schedule a new point few microseconds before an already programmed one. This leads to a whole period miss (e.g. 32.768ms with prescaler = 8). Decide what do it when the next SP is very near ? Improve logic, assembly code ?
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