Performance counter Report in nios

Hi Anand,

I am running the cyclone3 development kit.I use a Performance counter IP for checking Execution time of code in NIOS IDE(9.1). My code is shown below

# include <stdio.h>

# include "alt_types.h"

# include "system.h"

# include "altera_avalon_performance_counter.h" /*Use to measure code performance*/

int main()

{

int A,B,C,D = 0;

PERF_RESET(PERFORMANCE_COUNTER_0_BASE);

PERF_START_MEASURING(PERFORMANCE_COUNTER_0_BASE);

PERF_BEGIN(PERFORMANCE_COUNTER_0_BASE, 1);

C= A+B;

D=A-B

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

PERF_END(PERFORMANCE_COUNTER_0_BASE, 1);

PERF_STOP_MEASURING(PERFORMANCE_COUNTER_0_BASE);

perf_print_formatted_report((void*)PERFORMANCE_COU NTER_0_BASE, ALT_CPU_FREQ,2, "Sum", "Diff");

return 0;

}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////

performance counter report in my design shows that counter is not works properly.It generates junk values as shown below.

--Performance Counter Report--

Total Time: seconds (1422548144 clock-cycles)

ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ

ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ

ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ

ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ

what could be the reason?Is this problem relates to its freq setting??

Regard,

Salver