DI interrupt problems

• From: Edwin du <duq97_at_mails.tsinghua.edu.cn>
• Date: Tue, 24 Dec 2002 14:49:17 +0800

Dear all,
  Merry Christmas!
  I wrote a driver to catch di interrupt following structure as
comedi_parport.c. interrupt handling is the same.
  In the cmd routine, I wrote cmd parameters like this:
        cmd->start_src =                TRIG_NOW;
        cmd->start_arg =                0;

        cmd->scan_begin_src =   TRIG_EXT;
        cmd->scan_begin_arg =   0;

        cmd->convert_src =      TRIG_FOLLOW;
        cmd->convert_arg =      0;


        cmd->scan_end_src =     TRIG_COUNT;
        cmd->scan_end_arg =     n_chan;         /* number of channels */

        cmd->stop_src =         TRIG_NONE;
        cmd->stop_arg =         0;
        cmd->chanlist =         chanlist;
        cmd->chanlist_len =     n_chan;

        cmd->data = capdata;
        cmd->data_len = 30*sizeof(sampl_t);


    the problem is when I was trying to read from dev file, the 
     ret = read(comedi_fileno(dev),buf,BUFZ);
    does not return, while my interrupt does come.
    
    am I right to set cmd in this way?

Received on 2002-12-24Z06:49:17