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? 

[BIA_JHLL]

prj.config:

CONFIG_BT=y
CONFIG_BT_DEBUG_LOG=y
CONFIG_BT_CENTRAL=y
CONFIG_BT_PRIVACY=y
CONFIG_BT_SCAN_WITH_IDENTITY=y

CONFIG_BT_CTLR_TX_PWR_PLUS_3=y

CONFIG_BT_SCAN=y
CONFIG_BT_SCAN_FILTER_ENABLE=y
CONFIG_BT_SCAN_UUID_CNT=1

CONFIG_BT_BROADCASTER=y
CONFIG_BT_OBSERVER=y

CONFIG_BT_EXT_ADV=y
CONFIG_BT_CTLR_ADV_EXT=y
CONFIG_BT_CTLR_PHY_CODED=y
CONFIG_BT_USER_PHY_UPDATE=y

CONFIG_CONSOLE_HANDLER=y

CONFIG_BT_EXT_ADV_MAX_ADV_SET=2

CONFIG_TINYCRYPT=y
CONFIG_TINYCRYPT_SHA256=y
CONFIG_TINYCRYPT_ECC_DSA=y

CONFIG_ENTROPY_GENERATOR=y
CONFIG_STDOUT_CONSOLE=y
CONFIG_ENTROPY_DEVICE_RANDOM_GENERATOR=y

#
# C Library
#
CONFIG_NEWLIB_LIBC=y
CONFIG_TIMING_FUNCTIONS=y
# end of C Library

#Timer functions
#CONFIG_SOC_HAS_TIMING_FUNCTIONS=y
#CONFIG_SOC_SERIES_NRF53X=y
#CONFIG_SOC_COMPATIBLE_NRF=y

main (source file):

// Timers
timing_t start_time1, end_time1;
uint64_t total_cycles;
uint64_t total_ns;

timing_init();
timing_start();

start_time1 = timing_counter_get();

// code_execution_to_be_measured();

 
 sign_message_rsa(); //Encrypted RSA
 bt_le_ext_adv_set_data(adv, buffer, ARRAY_SIZE(buffer), NULL, 0);
 end_time1 = timing_counter_get();
 total_cycles = timing_cycles_get(&start_time1, &end_time1);
 total_ns = timing_cycles_to_ns(total_cycles);

 timing_stop();
 
 printk("#;%d;1;%x\n",_rssi,time_stamp);

[haakonsh]

I need the generated build/zephyr/.config, not prj.conf. 

PS:
How are you reading out the values of total_cycles and total_ns ?