Lingao Meng
dfd735045c
Add CONFIG_SIM_WALLTIME_RATIO Kconfig option and --sim-rt-ratio= command-line argument to control the ratio of simulated time to real time in percent. 100 means real-time (default), 200 means simulated time advances twice as fast, 50 means half speed. The implementation applies the ratio in host_gettime(), host_sleepuntil() and host_settimer() so both SIM_WALLTIME_SLEEP and SIM_WALLTIME_SIGNAL modes are supported. This is inspired by the --rt-ratio feature in Zephyr's native_sim board. Tested on sim:nsh with the following sleep test: $ echo -e "sleep 2\nexit" | time ./nuttx real 0m2.0xxs $ echo -e "sleep 2\nexit" | time ./nuttx --sim-rt-ratio=200 real 0m1.0xxs $ echo -e "sleep 2\nexit" | time ./nuttx --sim-rt-ratio=50 real 0m4.0xxs Signed-off-by: Lingao Meng <menglingao@xiaomi.com>
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
Getting Started
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
Documentation
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
Supported Boards
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
Contributing
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
License
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.