Hello Elliot
I am a newcomer to RT programming but here is my suggestion. You may
want to put a delay in before executing the pulse as follows:
pthread_make_periodic_np(t1, gethrtime() + 50000, 0);
pthread_make_periodic_np(t2, gethrtime() + 100000, 0);
I hope that helps!
Daniel
>From: Elliott Wolin <[EMAIL PROTECTED]>
>To: realtime linux <[EMAIL PROTECTED]>
>Subject: [rtl] One-shot pulse generator doesn't work using RTL
>Date: Thu, 04 May 2000 14:34:44 -0400
>
>Hi,
>
>I must be missing something fundamental. I don't know why the program
>below
>doesn't generate a single rectangular pulse on the parallel port with a
>width of
>50 microsec. (rtlinux 2.2.13, PIII 450).
>
>Rather than the 2nd thread running 50 microsec after the 1st, it runs
>immediately after the 1st, giving 10 microsec pulses.
>
>How do you delay the startup of a thread?
>
>
> Sincerely,
> Elliott Wolin
>
>
>===================================================================================
>
>
>/* Produce a single rectangular pulse on parallel port */
>
>#include <asm/io.h>
>#include <rtl.h>
>#include <pthread.h>
>
>#define LPT_PORT 0x378
>
>pthread_t t1,t2;
>
>
>void *fun(void *arg) {
> outb((int)arg, LPT_PORT);
> return(0);
>}
>
>
>int init_module(void) {
> pthread_create (&t1, NULL, fun, (void*)~0x0); /* rising edge */
> pthread_create (&t2, NULL, fun, (void*) 0x0); /* falling edge */
>
> /* pulse width is 50 microsec */
> pthread_make_periodic_np (t1, gethrtime(), 0); /* rising edge */
> pthread_make_periodic_np (t2, gethrtime()+50000, 0); /* falling edge */
>
> return(0);
>}
>
>
>void cleanup_module(void) {
> pthread_delete_np (t1);
> pthread_delete_np (t2);
>}
><< wolin.vcf >>
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