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19-Jun-2017 23:46

Before starting the debug session, we must setup the debug probe to SWD and SWO: Here is the example code: Data Log). When the target is running and accesses the two variables, the value and time is shown in the Data Log window.

You can also show the time as CPU cycle-based counts.

IAR Embedded Workbench for ARM expands the functionality of CYCLECOUNTER so that you can easily see the differences of CYCLECOUNTER using the CCSTEP register. By clicking Step Over, you increase the CYCLECOUNTER and the difference is shown as CCSTEP.

CYCLECOUNTER is provided by ARM Cortex-M3 MCUs but disabled in IAR Embedded Workbench for ARM as a default. If you use another debugging probe and CYCLECOUNTER values are not updated, try setting the CYCCNTENA bit in the DWT Control register (DWT_CTRL.

However, before trying to improve the performance of your code, you might want to measure the actual processing speed.

It is popular to use GPIO pins and oscilloscopes to measure the timing, and that is of course a valid and realistic approach.

If you use the time of an actual function, the Timer count can be reset by an interrupt and therefore we recommend using the timer only for measurements.If you only need a rough measurement, you can use a Log Breakpoint.When the code where the log breakpoint has been set is executed, the computer time will be displayed to the debug log window.The output of the execution can be seen in the Debug Log window: This technique is not suitable for precise measurement, but it is very easy to use.

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You can also, for example, loop the target function a thousand times and measure the before and after time to get the elapsed time.

The ARM Cortex-M Systick Timer count is stopped while the CPU is not running.