Use of timer in Nios

[Altera_Forum]

I have beginner level question about using timer in Nios. In timer datasheet there is an example:# include "nios.h" 

 int main(void) { int t = 0; // Set timer for 1 second na_timer1->np_timerperiodl = (short)(nasys_clock_freq & 0x0000ffff);   na_timer1->np_timerperiodh = (short)((nasys_clock_freq >> 16) & 0x0000ffff);  // Set timer running, looping, no interrupts  na_timer1->np_timercontrol = np_timercontrol_start_mask + np_timercontrol_cont_mask;   // Poll timer forever, print once per second  while(1)  {  if(na_timer1->np_timerstatus & np_timerstatus_to_mask)  {  printf("A second passed! (%d)\n",t++);  // Clear the to (timeout) bit  na_timer1->np_timerstatus = 0; // (any value)  } } }  When i compile and run this it works fine. But in my own application i nee timer that counts 455us not to 1 s. and i tried to change timerperiod register values. Th way I understood, they have used timer period of 33.333.000 in nasys_clock freq, which gives a time of 1 s. When i try to change it for example 15167 which is approx. 455us, there is a compiler error which says "parse error before '=' at the lines where i try to change the timer value. I tried it with the same timer example but with the different value: # include "nios.h"# define count_time = 15167 int main(void) { int t = 0; // Set timer for 1 second na_timer1->np_timerperiodl = (short)(count_time & 0x0000ffff);  na_timer1->np_timerperiodh = (short)((count_time >> 16) & 0x0000ffff);  // Set timer running, looping, no interrupts na_timer1->np_timercontrol = np_timercontrol_start_mask + np_timercontrol_cont_mask;  // Poll timer forever, print once per second  while(1)  {  if(na_timer1->np_timerstatus & np_timerstatus_to_mask)  {  printf("A second passed! (%d)\n",t++);  // Clear the to (timeout) bit  na_timer1->np_timerstatus = 0; // (any value)  } } }  It suddenly doesnt work? What's the problem?  Thanks!  -jarkko

[Altera_Forum]

Hi jarkko, 

 > What's the problem?  -# define count_time = 15167  +# define count_time 15167    Regards, --Scott

[Altera_Forum]

http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/dry.gif ehhhh.... thanks! 

 -jarkko