Kevin Bracey 57310729d4 wait_us optimization ... As the timer code became more generic, coping with initialization on demand, and variable width and speed us_ticker_api implementations, wait_us has gradually gotten slower and slower. Some platforms have reportedly seen overhead of wait_us() increase from 10µs to 30µs. These changes should fully reverse that drop, and even make it better than ever. Add fast paths for platforms that provide compile-time information about us_ticker. Speed and code size is improved further if: * Timer has >= 2^32 microsecond range, or better still is 32-bit 1MHz. * Platform implements us_ticker_read() as a macro * Timer is initialised at boot, rather than first use The latter initialisation option is the default for STM, as this has always been the case.		2019-06-14 10:22:08 +03:00
..
main.cpp	wait_us optimization	2019-06-14 10:22:08 +03:00
us_ticker_api_tests.h	Add tests for ticker HAL API.	2018-05-25 12:04:32 -05:00