Hi all
i am trying to create a user space parallel port interrupt but the problem is
that err=rt_intr_create(&intr_desc,"MyIrq",IRQ_NUMBER,I_NOAUTOENA);
returns -22 instead of zero which means success.i dont have idea what this
error code -22 means.please help me in this regard.i am attaching the sample
code.If some one can send me some basic working user space xenomai code i
would be very thankful.Thanks,
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#include <math.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/io.h>
#include <sys/mman.h>
#include <native/task.h>
#include <native/queue.h>
#include <native/intr.h>
#define STACK_SIZE 8192
#define STD_PRIO1 2
#define STD_PRIO2 1
#define IRQ_NUMBER 7
#define BASEPORT 0x378
#define PARPORTINT 7
RT_TASK zaehler1_task_ptr;
RT_TASK zaehler2_task_ptr;
RT_INTR intr_desc;
int count1 = 0;
int count2 = 0;
int i;
int end = 0;
// --s-ms-us-ns
RTIME task_period_ns1 = 1000000000llu;
RTIME task_period_ns2 = 10000000000llu;
void zaehler2_task(void *cookie){
int ret;
long ii;
long jj;
double a;
unsigned long overrun;
int err;
while(!end){
err = rt_intr_wait(&intr_desc,TM_INFINITE);
printf("Error is %d\n",err);
printf("\nInterrupt occured");
fflush(NULL);
}
// ********************** Ende des wiederholt ausgefuehrten Codes ***********************************************
}
// signal-handler, to ensure clean exit on Ctrl-C
void clean_exit(int dummy) {
printf("cleanup\n");
end = 1;
rt_task_delete(&zaehler2_task_ptr);
rt_intr_delete(&intr_desc);
printf("end\n");
}
int main(int argc, char *argv[]) {
int err, ret;
printf("start\n");
// install signal handler
signal(SIGTERM, clean_exit);
signal(SIGINT, clean_exit);
// ask for permission to access the parallel port from user-space
if (iopl(3)) {
perror("iopl");
// printf("iopl err\n");
exit(1);
}
outb_p(0x10, BASEPORT + 2);
mlockall(MCL_CURRENT | MCL_FUTURE);
err = rt_intr_create(&intr_desc,"MyIrq",IRQ_NUMBER,I_NOAUTOENA);
printf("rt_intr_create=%i\n", err);
switch(-err)
{
case ENOMEM :
printf("fail to allocate dynamic memory");
break;
case EBUSY:
printf("Busy");
break;
}
rt_intr_enable (&intr_desc);
/* create zaehler2_task */
err = rt_task_create(&zaehler2_task_ptr,"beta",STACK_SIZE,STD_PRIO2,0);
/* start zaehler2_task */
err = rt_task_start(&zaehler2_task_ptr,&zaehler2_task,NULL);
// wait for signal & return of signal handler
pause();
fflush(NULL);
return 0;
}
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