smbolton / stm32f3-liar-test

Test harness for the liar benchmarking crate, using the Rust no_std environment on STM32F3 microcontrollers

stm32f3-liar-test

This is some work-in-progress test code for the liar benchmarking crate. At present, it is able to compile and run liar on an STM32F3 Discovery board, benchmark short functions using the Cortex-M DWT cycle counter, and present very simple results via semihosting.

This is built on top of Jorge Aparicio's embedded Rust work, including the xargo cross-compilation tool and his Cortex-M runtime. If you can get his quickstart examples running, you should be able to run this in much the same way.

Output

Right now, the code just dumps the liar::no_std::runner::Samples struct for each test run. I modified my copy of liar to perform 10 iterations per run_loop() with 4 samples per run(), so that it wouldn't take all day nor spew pages of output. The output looks like this:

liar test starting
test results:
units are average count of CPU clocks at 13.888889 nanoseconds each
nop:
    981
    981
    981
    981
foo:
    101144
    101144
    101144
    101144
liar test finished

License

stm32f3-liar-test is licensed under the MIT/X11 license.

Portions of the build scripts are from Jorge Aparicio's cortex-m-quickstart project, copyright © 2017 Jorge Aparicio, as noted in the particular files. See https://github.com/japaric/cortex-m-quickstart for details.

The remainder of stm32f3-liar-test is written by Sean Bolton, and licensed as follows:

Copyright © 2017 Sean Bolton

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.