Ewout van Bekkum 830d5d1ac0 pw_chrono: Improve SystemClock C API ... Changes the SystemClock C Api to: 1) Use a pw_chrono_SystemClock_Duration struct instead of aliasing an int64_t under pw_chrono_SystemClock_TickCount which could accidentally permit direct tick usage. 2) Add PW_SYSTEM_CLOCK_{MS,S,MIN,H} and PW_SYSTEM_CLOCK_{MS,S,MIN,H}_CEIL to permit C API users to create durations which round up to the nearest tick for deadlines and timeouts, mirroring std::chrono::ceil. 3) Add PW_SYSTEM_CLOCK_{MS,S,MIN,H}_FLOOR to permit C API users to create durations which round down to the nearest tick for oddball corner cases, mirroring std::chrono::floor. 4) In order to enable said macros, the system_clock_config.h backend config was changed to require the clock period as a preprocessor defines instead of a std::ratio<>. 5) Renames pw_chrono_SystemClock_TimeDelta to pw_chrono_SystemClock_TimeElapsed to make the argument ordering make more sense. 6) Changes existing std::chrono::duration_cast usage to std::chrono::ceil and std::chrono:floor to set a good example to be explicit on rounding. 7) Renames pw_chrono_SystemClock_TickCountsToNsTruncate accordingly to pw_chrono_SystemClock_DurationToNsFloor. Requires: pigweed-internal:9340 Change-Id: Ia628dceac53f964eda7c4aacd3d790b8b0e92207 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/31280 Commit-Queue: Ewout van Bekkum <ewout@google.com> Reviewed-by: Wyatt Hepler <hepler@google.com>		2021-01-30 01:48:08 +00:00
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public/pw_chrono_freertos	pw_chrono: Improve SystemClock C API	2021-01-30 01:48:08 +00:00
public_overrides/pw_chrono_backend
BUILD
BUILD.gn
docs.rst
system_clock.cc