demo/info.c

   1 /*
   2    This demo reads information about a comedi device and
   3    displays the information in a human-readable form.
   4  */
   5
   6 #include <stdio.h>
   7 #include <comedilib.h>
   8 #include <fcntl.h>
   9 #include <unistd.h>
  10 #include <sys/ioctl.h>
  11 #include <errno.h>
  12
  13 void help(void)
  14 {
  15         fprintf(stderr,"info </dev/comediN>\n");
  16         exit(0);
  17 }
  18
  19 char *tobinary(char *s,int bits,int n);
  20
  21 char *subdevice_types[]={
  22         "unused",
  23         "analog input",
  24         "analog output",
  25         "digital input",
  26         "digital output",
  27         "digital I/O",
  28         "counter",
  29         "timer",
  30         "memory",
  31         "calibration",
  32         "processor"
  33 };
  34
  35 comedi_t *it;
  36 extern char *filename;
  37
  38
  39 int main(int argc,char *argv[])
  40 {
  41         int i;
  42         int n_subdevices,type;
  43
  44         parse_options(argc,argv);
  45
  46         it=comedi_open(filename);
  47         if(!it){
  48                 fprintf(stderr,"cannot open %s\n",filename);
  49                 exit(0);
  50         }
  51
  52         printf("overall info:\n");
  53         printf("  version code: 0x%06x\n",comedi_get_version_code(it));
  54         printf("  driver name: %s\n",comedi_get_driver_name(it));
  55         printf("  board name: %s\n",comedi_get_board_name(it));
  56         printf("  number of subdevices: %d\n",n_subdevices=comedi_get_n_subdevices(it));
  57
  58         for(i=0;i<n_subdevices;i++){
  59                 printf("subdevice %d:\n",i);
  60                 type=comedi_get_subdevice_type(it,i);
  61                 printf("  type: %d (%s)\n",type,subdevice_types[type]);
  62                 printf("  number of channels: %d\n",comedi_get_n_channels(it,i));
  63                 printf("  max data value: %d\n",comedi_get_maxdata(it,i,0));
  64         }
  65
  66         return 0;
  67 }
  68
  69 char *tobinary(char *s,int bits,int n)
  70 {
  71         int bit=1<<n;
  72         char *t=s;
  73
  74         for(;bit;bit>>=1)
  75                 *t++=(bits&bit)?'1':'0';
  76         *t=0;
  77
  78         return s;
  79 }
  80