osdep/timer-lx.c

   1 // Precise timer routines for LINUX  (C) LGB & A'rpi/ASTRAL
   2
   3 #include <unistd.h>
   4 #include <stdlib.h>
   5 #include <time.h>
   6 #include <sys/time.h>
   7 #include "../config.h"
   8
   9 int usec_sleep(int usec_delay)
  10 {
  11 #ifdef HAVE_NANOSLEEP
  12     struct timespec ts;
  13     ts.tv_sec  =  usec_delay / 1000000;
  14     ts.tv_nsec = (usec_delay % 1000000) * 1000;
  15     return nanosleep(&ts, NULL);
  16 #else
  17     return usleep(usec_delay);
  18 #endif
  19 }
  20
  21
  22 // Returns current time in microseconds
  23 unsigned int GetTimer(){
  24   struct timeval tv;
  25   struct timezone tz;
  26 //  float s;
  27   gettimeofday(&tv,&tz);
  28 //  s=tv.tv_usec;s*=0.000001;s+=tv.tv_sec;
  29   return (tv.tv_sec*1000000+tv.tv_usec);
  30 }
  31
  32 // Returns current time in milliseconds
  33 unsigned int GetTimerMS(){
  34   struct timeval tv;
  35   struct timezone tz;
  36 //  float s;
  37   gettimeofday(&tv,&tz);
  38 //  s=tv.tv_usec;s*=0.000001;s+=tv.tv_sec;
  39   return (tv.tv_sec*1000+tv.tv_usec/1000);
  40 }
  41
  42 static unsigned int RelativeTime=0;
  43
  44 // Returns time spent between now and last call in seconds
  45 float GetRelativeTime(){
  46 unsigned int t,r;
  47   t=GetTimer();
  48 //  t*=16;printf("time=%ud\n",t);
  49   r=t-RelativeTime;
  50   RelativeTime=t;
  51   return (float)r * 0.000001F;
  52 }
  53
  54 // Initialize timer, must be called at least once at start
  55 void InitTimer(){
  56   GetRelativeTime();
  57 }
  58
  59
  60 #if 0
  61 void main(){
  62   float t=0;
  63   InitTimer();
  64   while(1){ t+=GetRelativeTime();printf("time= %10.6f\r",t);fflush(stdout); }
  65 }
  66 #endif
  67