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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| .. | ||
| TOOLCHAIN_ARM_MICRO | ||
| TOOLCHAIN_ARM_STD | ||
| TOOLCHAIN_GCC_ARM | ||
| TOOLCHAIN_IAR | ||
| rtx4 | ||
| rtx5 | ||
| SysTimer.cpp | ||
| SysTimer.h | ||
| mbed_boot.c | ||
| mbed_boot.h | ||
| mbed_rtos1_types.h | ||
| mbed_rtos_rtx.c | ||
| mbed_rtos_storage.h | ||
| mbed_rtx_conf.h | ||
| mbed_rtx_handlers.c | ||
| mbed_rtx_idle.cpp | ||