Performance Counter

I want to measure a time count taken for a section of a code. But the output i'm getting is always zero. I'm viewing my output through IDE output console.

I have patched my code and the output i got.

Note: Using Quarus II 4.2 SP1

Can anyone help me in this regard.

Thanks,

Sanchu.C

# #########################CODE#####################

# include <stdio.h># include "altera_avalon_performance_counter.h"# include "system.h"

void* perfbase = 0x00100800; # define COMPUTE_FUNCTION_SECTION 1

void compute()

{

int counter,sum;

sum=0;

PERF_BEGIN (perfbase, COMPUTE_FUNCTION_SECTION);

for(counter=0;counter<100;counter++)

sum=sum+counter;

PERF_END (perfbase, COMPUTE_FUNCTION_SECTION);

printf("\n Sum = %d \n",sum);

}

int main()

{

printf("Hello from Nios II!\n");

PERF_RESET (perfbase);

PERF_START_MEASURING (perfbase);

compute();

PERF_STOP_MEASURING (perfbase);

unsigned int section_time = 1;

section_time = perf_get_section_time (perfbase,COMPUTE_FUNCTION_SECTION);

printf ("section_time: %d\n",section_time);

perf_print_formatted_report(perfbase, ALT_CPU_FREQ,1,"compute");

return 0;

}

# ##################OUTPUT VIEW THROUGH IDE CONSOLE#####################

Hello from Nios II!

Sum = 4950

section_time: 0

--Performance Counter Report--

Total Time: 0 seconds (0 clock-cycles)

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

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

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

|compute | NaN| 0.00000| 0| 0|

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