I need to know NIOS2 CPU utilization

Hi jan,

> can give me advice how to get exact 20ms timing in uClinux

> running in NIOS2

Linux user-space timer mechanisms don't always behave in a manner that

most embedded developers would expect. For example, on some systems

usleep(1000) will sleep for 20 msec ... not 1 msec! 8-P

A (potential) work-around is to use select() system call ... which may give

you better resolution on some systems ... and is relatively portable.

I've used it successfully on several PowerPC & ARM systems with timeouts

as low as 1 msec ... although I haven't tested it with Nios-II/uClinux.

You might want to give it a try (and let us all know what you learn).

Ultimately, this all depends on your hardware timer though :-)

    struct timeval to;
  to.tv_sec = 0;
  to.tv_usec = SOME_USEC_VALUE;
  select( 0, NULL, NULL, NULL, &to );

Regards,

--Scott