alt_timestamp returns the same value

[Altera_Forum]

Hello, I'm trying below: 

int main() { alt_u32 t1; alt_u32 t2; alt_u32 t3;  int ret = alt_timestamp_start(); t1 = alt_timestamp(); usleep(1000000); t2 = alt_timestamp(); t3 = alt_timestamp_freq();  return 0; }  ret is 0, t3 is 50000000(the input clock of Interval Timer object), but t1 and t2 always show 4209704959. It seems that the Timer is not ticking. I also tried alt_nticks which always returned 0; I wonder what might be the problem here.  -Cyclone V Dev Board -QuartusII 15.0(64bit), Qsys on Win7 -NiosI 15.0 Software Build Tools for Eclipse  Thanks in advance.

[Altera_Forum]

could you try to place the usleep with some for loop delay just to isolate this is time stamp feature nor working first?

[Altera_Forum]

Thank you pororo, 

I tried below but still not working: int main()  {  alt_u32 t1;  alt_u32 t2;  alt_u32 t3;  unsigned int i;   int ret = alt_timestamp_start();  t1 = alt_timestamp();  for(i=0; i<0x00ffffff; i++) IORD(ONCHIP_MEMORY2_1_BASE,0);  t2 = alt_timestamp();  t3 = alt_timestamp_freq();   return 0;  }  I still get 4209704959 for both t1 and t2. I had never faced this problem when I was using Cyclone IV Development or Custom boards with QuartusII, SOPC Builder & NiosII 11.0sp1. I wonder what I am missing..

[Altera_Forum]

Sorry, 

It seems that my problem was not connecting data_master of NiosII and slave of Interval Timer in Qsys. Instead, I was connecting instruction_master. Thanks!

[Altera_Forum]

--- Quote Start ---  Sorry, It seems that my problem was not connecting data_master of NiosII and slave of Interval Timer in Qsys. Instead, I was connecting instruction_master. Thanks!  --- Quote End ---    good to hear that!!!