mirror of https://github.com/ARMmbed/mbed-os.git
0d12800b9f
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. |
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| .. | ||
| common_tickers | ||
| common_tickers_freq | ||
| crc | ||
| critical_section | ||
| flash/functional_tests | ||
| gpio | ||
| lp_ticker | ||
| minimum_requirements | ||
| mpu | ||
| pinmap | ||
| qspi | ||
| rtc | ||
| rtc_reset | ||
| rtc_time | ||
| rtc_time_conv | ||
| sleep | ||
| sleep_manager | ||
| sleep_manager_racecondition | ||
| spm | ||
| stack_size_unification | ||
| ticker | ||
| trng | ||
| us_ticker | ||