testing/cmd_2.c

   1
   2 #include <stdio.h>
   3 #include <comedilib.h>
   4 #include <fcntl.h>
   5 #include <unistd.h>
   6 #include <sys/ioctl.h>
   7 #include <errno.h>
   8 #include <getopt.h>
   9 #include <ctype.h>
  10 #include <math.h>
  11 #include <sys/time.h>
  12 #include <string.h>
  13 #include "comedi_test.h"
  14
  15 static int get_chunks_per_length(int length);
  16
  17 #define BUFSZ 10000
  18
  19 int test_cmd_fifo_depth_check(void)
  20 {
  21         int len;
  22
  23         if(!(comedi_get_subdevice_flags(device,subdevice)&SDF_CMD)){
  24                 printf("not applicable\n");
  25                 return 0;
  26         }
  27
  28         for(len=64;len<65536;len<<=1){
  29                 printf("%d, %d\n",len,get_chunks_per_length(len));
  30         }
  31
  32         return 0;
  33 }
  34
  35 static int get_chunks_per_length(int length)
  36 {
  37         comedi_cmd cmd;
  38         char buf[BUFSZ];
  39         unsigned int chanlist[1];
  40         int go;
  41         int total=0;
  42         int ret;
  43         int chunks=0;
  44
  45         if(comedi_get_cmd_generic_timed(device,subdevice,&cmd)<0){
  46                 printf("  not supported\n");
  47                 return 0;
  48         }
  49
  50         if(realtime)cmd.flags |= TRIG_RT;
  51
  52         cmd.chanlist = chanlist;
  53         cmd.scan_end_arg = 1;
  54         cmd.stop_arg = length;
  55         cmd.chanlist_len = 1;
  56         chanlist[0] = CR_PACK(0,0,0);
  57
  58         comedi_command(device,&cmd);
  59
  60         go=1;
  61         while(go){
  62                 ret = read(comedi_fileno(device),buf,BUFSZ);
  63                 if(ret<0){
  64                         if(errno==EAGAIN){
  65                                 usleep(10000);
  66                         }else{
  67                                 go = 0;
  68                                 perror("read");
  69                         }
  70                 }else if(ret==0){
  71                         go = 0;
  72                 }else{
  73                         total += ret;
  74                         chunks++;
  75                 }
  76         }
  77
  78         return chunks;
  79 }
  80