Measuring execution time with timing.h

[ALAV]

Hi, there i want to measure code execution time of a function. I came across https://docs.zephyrproject.org/latest/reference/timing_functions/index.html. I have enabled CONFIG_TIMING_FUNCTIONS on my prj.conf file. However the build cannot link to the timing functions. I get undefined references to both board_timing functions and soc_timing functions. How can i fix this. Additionally is there a better way to measure code execution time ?

[azwawe]

anybidy got the answer? I also trrying to use this function but got error undefined references to timer function.

For example

 

C:\nrf\example\button\src\main.c:21: undefined reference to `soc_timing_init'

 

I already add some c++ in configuration files.

Below is my configuration files.

# Include C++ Support
CONFIG_CPLUSPLUS=y

#include std c/c++, do not remove else standard design patterns will not work
CONFIG_NEWLIB_LIBC=y
CONFIG_LIB_CPLUSPLUS=y

# Log
CONFIG_LOG=y
CONFIG_LOG_PRINTK=y
CONFIG_LOG_MODE_DEFERRED=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_RTT_CONSOLE=y
CONFIG_LOG_BACKEND_UART=y

# Timer
CONFIG_TIMING_FUNCTIONS=y

# GPIO
CONFIG_GPIO=y

Anybody have solution for this? thanks.

[haakonsh]

Have you included timing.h in your source file?
#include <zephyr/timing/timing.h>

Have you enabled the Zephyr subsystem timing library?

soc_timing_init is defined in zephyr/soc/arm/nordic_nrf/timing.c, which is included by zephyr/soc/arm/nordic_nrf/CMakeLists.txt:

if(CONFIG_SOC_HAS_TIMING_FUNCTIONS AND NOT CONFIG_BOARD_HAS_TIMING_FUNCTIONS)
  if(CONFIG_TIMING_FUNCTIONS)
    # Use nRF-specific timing calculations only if DWT is not present
    if(NOT CONFIG_CORTEX_M_DWT)
      zephyr_library_sources(timing.c)
    endif()
  endif()
endif()

Verify the dependencies listed above.

[BIA_JHLL]

I have already done all those steps, but now I get the following error: "zephyr/timing/timing.h: No such a file or directory". 

Eventhough I have in my source file the next line without any error: 

#include <timing/timing.h>

[haakonsh]

Have you satisfied the dependencies listed in the snippet from the CMakeList.txt in my previous post?

[BIA_JHLL]

Yes. Of course. Finally I got the compilation right. I saw in zephyr website than I have to use: “timing_init()” instead of “soc_timing_init()”. 
But now I have a question if can solve it. When I use the function “timing_cycles_to_ns(total_cycles)” I always have the same value which is 240. 
In the previous step I coded this: “total_cycles = timing_cycles_get(&start_time, &end_time);” and the result is correctly calculated and consistent

[haakonsh]

Can you share build/zephyr/.config? 

Can you share a code snippet of your timing code?