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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| .. | ||
| TARGET_CORTEX | ||
| ConditionVariable.cpp | ||
| ConditionVariable.h | ||
| EventFlags.cpp | ||
| EventFlags.h | ||
| Kernel.cpp | ||
| Kernel.h | ||
| LICENSE-mit.txt | ||
| LICENSE.md | ||
| Mail.h | ||
| MemoryPool.h | ||
| Mutex.cpp | ||
| Mutex.h | ||
| Queue.h | ||
| RtosTimer.cpp | ||
| RtosTimer.h | ||
| Semaphore.cpp | ||
| Semaphore.h | ||
| ThisThread.cpp | ||
| ThisThread.h | ||
| Thread.cpp | ||
| Thread.h | ||
| mbed_lib.json | ||
| rtos.h | ||
| rtos_handlers.h | ||
| rtos_idle.h | ||