Hallo,
I get an error in a simple program with a period time of 1 ms.My latency test
program works with a period of 100us.The worst latenz time is about 23us
Any suggestions?
Andreas
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#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>
#include <native/sem.h>
#define STACK_SIZE 0
#define PRIO_TIMER 3
RT_TASK test_task;
int int_count = 0;
int end = 0;
// --s-ms-us-ns
RTIME task_period_ns = 001000000llu;
void test_task_fct(){
int count = 0;
int ret;
int err =0;
unsigned long overrun;
unsigned char sound_byte;
unsigned char toggle = 0;
ret = rt_task_set_periodic(NULL, TM_NOW, rt_timer_ns2ticks(task_period_ns));
if (ret) {
printf("error while set periodic, code %d\n",ret);
return;
}
while(!end){
ret = rt_task_set_mode(0, T_PRIMARY, NULL);
if (ret) {
printf("error while rt_task_set_mode, code %d\n",ret);
return;
}
ret = rt_task_wait_period(&overrun);
if (ret) {
switch (ret) {
case -EWOULDBLOCK: printf("1\n");
break;
case -EINTR: printf("2\n");
break;
case -ETIMEDOUT: printf("3\n");
break;
case -EPERM: printf("4\n");
break;
}
printf("error while rt_task_wait_period, code %d\n",ret);
return;
}
unsigned char bell = 7;
printf("%c",bell);
fflush(NULL);
}
}
// signal-handler, to ensure clean exit on Ctrl-C
void clean_exit(int dummy) {
printf("[MAIN] try clean exit\n");
end = 1;
rt_task_delete(&test_task);
printf("[MAIN] bye bye\n");
}
int main(int argc, char *argv[]) {
int err, ret = 0;
printf("[MAIN] start system\n");
// install signal handler
signal(SIGTERM, clean_exit);
signal(SIGINT, clean_exit);
mlockall(MCL_CURRENT | MCL_FUTURE);
err = rt_task_spawn(&test_task, "Timer", STACK_SIZE, PRIO_TIMER, 0, &test_task_fct, NULL);
if (err) {
printf("error rt_task_spawn\n");
return 0;
}
printf("[MAIN] test_task created\n");
printf("[MAIN] \n");
pause();
fflush(NULL);
return 0;
}
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