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         unsigned int flags = comedi_get_subdevice_flags(device,subdevice);
  23
  24         if(!(flags&SDF_CMD) || (comedi_get_read_subdevice(device)!=subdevice)){
  25                 printf("not applicable\n");
  26                 return 0;
  27         }
  28
  29         for(len=64;len<65536;len<<=1){
  30                 printf("%d, %d\n",len,get_chunks_per_length(len));
  31         }
  32
  33         return 0;
  34 }
  35
  36 static int get_chunks_per_length(int length)
  37 {
  38         comedi_cmd cmd;
  39         char buf[BUFSZ];
  40         unsigned int chanlist[1];
  41         int go;
  42         int total=0;
  43         int ret;
  44         int chunks=0;
  45
  46         if(comedi_get_cmd_generic_timed(device, subdevice, &cmd, 1, 1)<0){
  47                 printf("  not supported\n");
  48                 return 0;
  49         }
  50
  51         if(realtime)cmd.flags |= TRIG_RT;
  52
  53         cmd.chanlist = chanlist;
  54         cmd.scan_end_arg = 1;
  55         cmd.stop_arg = length;
  56         cmd.chanlist_len = 1;
  57         chanlist[0] = CR_PACK(0,0,0);
  58
  59         comedi_command(device,&cmd);
  60
  61         go=1;
  62         while(go){
  63                 ret = read(comedi_fileno(device),buf,BUFSZ);
  64                 if(ret<0){
  65                         if(errno==EAGAIN){
  66                                 usleep(10000);
  67                         }else{
  68                                 go = 0;
  69                                 perror("read");
  70                         }
  71                 }else if(ret==0){
  72                         go = 0;
  73                 }else{
  74                         total += ret;
  75                         chunks++;
  76                 }
  77         }
  78
  79         return chunks;
  80 }
  81