performance counter core

[Altera_Forum]

hi there, 

 in my previous message, the code i have was too complicated. I wrote a simple routine to test perfomance counter core. I am running the nios 2/cyclone 2 development kit.  /* * "Hello World" example. * * This example prints &#39;Hello from Nios II&#39; to the STDOUT stream. It runs on * the Nios II &#39;standard&#39;, &#39;full_featured&#39;, &#39;fast&#39;, and &#39;low_cost&#39; example * designs. It runs with or without the MicroC/OS-II RTOS and requires a STDOUT * device in your system&#39;s hardware. * The memory footprint of this hosted application is ~69 kbytes by default * using the standard reference design. * * For a reduced footprint version of this template, and an explanation of how * to reduce the memory footprint for a given application, see the * "small_hello_world" template. * */ # include <stdio.h># include "alt_types.h"# include "system.h"# include "altera_avalon_performance_counter.h" /*Use to measure code performance*/    int main() { int count = 0; PERF_RESET(PERFORMANCE_COUNTER_0_BASE); PERF_START_MEASURING(PERFORMANCE_COUNTER_0_BASE); PERF_BEGIN(PERFORMANCE_COUNTER_0_BASE, 1); count++; 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_COUNTER_0_BASE, ALT_CPU_FREQ,2, "total", "rate1"); return 0; }   I compiled and loaded the program using the nios 2 programmer and I still get the same output  nios2-terminal: Warning: The JTAG cable you are using is not supported for Nios nios2-terminal: II systems. You may experience intermittent JTAG communication nios2-terminal: failures with this cable. Please use a USB Blaster revision B nios2-terminal: cable or another supported cable. Please refer to the file nios2-terminal: errata.txt included in the Nios II development kit documents nios2-terminal: directory for more information.  nios2-terminal: connected to hardware target using JTAG UART on cable nios2-terminal: "USB-Blaster [USB-0]", device 1, instance 0 nios2-terminal: (Use the IDE stop button or Ctrl-C to terminate)  Hello from Nios II! --Performance Counter Report-- Total Time: 2.17021E+11 seconds (18446744073709551615 clock-cycles) +---------------+-----+-----------+---------------+-----------+ | Section | % | Time (sec)| Time (clocks)|Occurrences| +---------------+-----+-----------+---------------+-----------+ |total | 100|217020518514.23001| -1| 4294967295| +---------------+-----+-----------+---------------+-----------+ |rate1 | 100|217020518514.23001| -1| 4294967295| +---------------+-----+-----------+---------------+-----------+   look at how long the total time and -1 in Time. How can this be? anyone has any suggestion?