The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/dataacq.h

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    1 /* Header for general data acquisition definitions.
    2  */
    3 
    4 #ifndef _SYS_DATAACQ_H_
    5 #define _SYS_DATAACQ_H_
    6 
    7 #include <sys/ioccom.h>
    8 
    9 /* Period in microseconds between analog I/O samples.
   10  */
   11 #define AD_MICRO_PERIOD_SET _IOW('A', 1, long)
   12 #define AD_MICRO_PERIOD_GET _IOR('A', 2, long)
   13 
   14 /* Gain list support.  Initially all gains are 1.  If the board
   15  * supports no gains at all then AD_NGAINS_GET will return a 0.
   16  *
   17  * AD_NGAINS_GET: Return the number of gains the board supports
   18  *
   19  * AD_SUPPORTED_GAINS: Get the supported gains.
   20  * The driver will copy out "ngains" doubles,
   21  * where "ngains" is obtained with AD_NGAINS_GET.
   22  *
   23  * AD_GAINS_SET: Set the gain list.  The driver will copy in "ngains" ints.
   24  *
   25  * AD_GAINS_GET: Get the gain list.  The driver will copy out "ngains" ints.
   26  */
   27 
   28 #define AD_NGAINS_GET     _IOR('A', 3, int)
   29 #define AD_NCHANS_GET     _IOR('A', 4, int)
   30 #define AD_SUPPORTED_GAINS _IO('A', 5)
   31 #define AD_GAINS_SET       _IO('A', 6)
   32 #define AD_GAINS_GET       _IO('A', 7)
   33 
   34 #endif /* !_SYS_DATAACQ_H_ */

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