Problem with Performance Counter Unit

Hi ,

I am facing the same problem . Were you able to solve the problem?

Can anyone tell me the cause of the problem if they have faced similar issue.

thanks.

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Hi I am trying to measure the number of clock cycles in NIOS2-Eclipse for a C Code using the Performance Counter and I get number of clock cycles as "-1".

I have used Altera's DE1-NIOS reference design and added the performance counter unit using SOPC builder.

My Code is posted below, please tell me what I have done wrong. Thanks a lot.....

Code : # include <stdio.h># include <system.h># include <altera_avalon_performance_counter.h>

int main()

{

PERF_RESET(PERFORMANCE_COUNTER_0_BASE);

PERF_START_MEASURING(PERFORMANCE_COUNTER_0_BASE);

printf("HELLO WORLD!!\n");

PERF_STOP_MEASURING(PERFORMANCE_COUNTER_0_BASE);

perf_print_formatted_report ((void *)PERFORMANCE_COUNTER_0_BASE,ALT_CPU_FREQ,1,"FFT");

return 0;

}

Output I get :

HELLO WORLD!!

--Performance Counter Report--

Total Time: 1.84467E+11 seconds (-1 clock-cycles)

+---------------+-----+-----------+---------------+-----------+

| Section | % | Time (sec)| Time (clocks)|Occurrences|

+---------------+-----+-----------+---------------+-----------+

|FFT | 100|184467440737.09552| -1| 100002|

+---------------+-----+-----------+---------------+-----------+

Thanks.

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Hi,

Not actually but found a work around, i made a new design in the SOPC builder which just had NIOSII Processor, 20KB of On Chip-RAM, JTAG-UART, Performance Counter Unit.

Then I enabled small C libraries in NIOSII-IDE and ran the same code and got the correct cycle count