Problem with Performance Counter Unit

[Altera_Forum]

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.

[Altera_Forum]

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.      --- Quote Start ---  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.  --- Quote End ---  

[Altera_Forum]

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