<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >comedi_get_subdevice_flags</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE=" Comedi " HREF="index.html"><LINK REL="UP" TITLE=" Comedi Function Reference " HREF="x4629.html#FUNCTIONREFERENCE"><LINK REL="PREVIOUS" TITLE="comedi_get_write_subdevice" HREF="r5134.html"><LINK REL="NEXT" TITLE="comedi_get_n_channels" HREF="r5268.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Comedi: The <SPAN CLASS="emphasis" ><I CLASS="EMPHASIS" >Control and Measurement Device Interface</I ></SPAN > handbook </TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="r5134.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="r5268.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="FUNC-REF-COMEDI-GET-SUBDEVICE-FLAGS" ></A >comedi_get_subdevice_flags</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN5157" ></A ><H2 >Name</H2 >comedi_get_subdevice_flags -- properties of subdevice</DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN5160" ></A ><H2 >Synopsis</H2 ><DIV CLASS="FUNCSYNOPSIS" ><P ></P ><A NAME="AEN5161" ></A ><PRE CLASS="FUNCSYNOPSISINFO" >#include <comedilib.h></PRE ><P ><CODE ><CODE CLASS="FUNCDEF" >int comedi_get_subdevice_flags</CODE >(comedi_t * device, unsigned int subdevice);</CODE ></P ><P ></P ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN5170" ></A ><H2 > Description </H2 ><P >This function returns a bitfield describing the capabilities of the specified subdevice. If there is an error, -1 is returned, and the Comedilib error value is set.</P ><P ><DIV CLASS="TABLE" ><A NAME="AEN5174" ></A ><P ><B >Table 1. subdevice flags</B ></P ><TABLE BORDER="1" RULES="all" WIDTH="100%" CLASS="CALSTABLE" ><COL><COL><COL><THEAD ><TR ><TH >Subdevice Flag</TH ><TH >Value (hexadecimal)</TH ><TH >Description</TH ></TR ></THEAD ><TBODY ><TR ><TD >SDF_BUSY</TD ><TD >0x00000001</TD ><TD >The subdevice is busy performing an asynchronous command. A subdevice being "busy" is slightly different from the "running" state flagged by SDF_RUNNING. A "running" subdevice is always "busy", but a "busy" subdevice is not necessarily "running". For example, suppose an analog input command has been completed by the hardware, but there are still samples in Comedi's buffer waiting to be read out. In this case, the subdevice is not "running", but is still "busy" until all the samples are read out or comedi_cancel() is called.</TD ></TR ><TR ><TD >SDF_BUSY_OWNER</TD ><TD >0x00000002</TD ><TD >The subdevice is "busy", and the command it is running was started by the current process.</TD ></TR ><TR ><TD >SDF_LOCKED</TD ><TD >0x00000004</TD ><TD >The subdevice has been locked by comedi_lock().</TD ></TR ><TR ><TD >SDF_LOCK_OWNER</TD ><TD >0x00000008</TD ><TD >The subdevice is locked, and was locked by the current process.</TD ></TR ><TR ><TD >SDF_MAXDATA</TD ><TD >0x00000010</TD ><TD >The maximum data value for the subdevice depends on the channel.</TD ></TR ><TR ><TD >SDF_FLAGS</TD ><TD >0x00000020</TD ><TD >The subdevice flags depend on the channel (unfinished/broken support in library).</TD ></TR ><TR ><TD >SDF_RANGETYPE</TD ><TD >0x00000040</TD ><TD >The range type depends on the channel.</TD ></TR ><TR ><TD >SDF_CMD</TD ><TD >0x00001000</TD ><TD >The subdevice supports asynchronous commands.</TD ></TR ><TR ><TD >SDF_SOFT_CALIBRATED</TD ><TD >0x00002000</TD ><TD >The subdevice relies on the host to do calibration in software. Software calibration coefficients are determined by the comedi_soft_calibrate utility. See the description of the comedi_get_softcal_converter() function for more information.</TD ></TR ><TR ><TD >SDF_READABLE</TD ><TD >0x00010000</TD ><TD >The subdevice can be read (e.g. analog input).</TD ></TR ><TR ><TD >SDF_WRITABLE</TD ><TD >0x00020000</TD ><TD >The subdevice can be written to (e.g. analog output).</TD ></TR ><TR ><TD >SDF_INTERNAL</TD ><TD >0x00040000</TD ><TD >The subdevice does not have externally visible lines.</TD ></TR ><TR ><TD >SDF_GROUND</TD ><TD >0x00100000</TD ><TD >The subdevice supports AREF_GROUND.</TD ></TR ><TR ><TD >SDF_COMMON</TD ><TD >0x00200000</TD ><TD >The subdevice supports AREF_COMMON.</TD ></TR ><TR ><TD >SDF_DIFF</TD ><TD >0x00400000</TD ><TD >The subdevice supports AREF_DIFF.</TD ></TR ><TR ><TD >SDF_OTHER</TD ><TD >0x00800000</TD ><TD >The subdevice supports AREF_OTHER</TD ></TR ><TR ><TD >SDF_DITHER</TD ><TD >0x01000000</TD ><TD >The subdevice supports dithering (via the CR_ALT_FILTER chanspec flag).</TD ></TR ><TR ><TD >SDF_DEGLITCH</TD ><TD >0x02000000</TD ><TD >The subdevice supports deglitching (via the CR_ALT_FILTER chanspec flag).</TD ></TR ><TR ><TD >SDF_RUNNING</TD ><TD >0x08000000</TD ><TD >An asynchronous command is running. You can use this flag to poll for the completion of an output command.</TD ></TR ><TR ><TD >SDF_LSAMPL</TD ><TD >0x10000000</TD ><TD >The subdevice uses the 32 bit lsampl_t type instead of the 16 bit sampl_t for asynchronous command data.</TD ></TR ><TR ><TD >SDF_PACKED</TD ><TD >0x20000000</TD ><TD >The subdevice uses bitfield samples for asynchronous command data, one bit per channel (otherwise it uses one sampl_t or lsampl_t per channel). Commonly used for digital subdevices.</TD ></TR ></TBODY ></TABLE ></DIV ></P ><P > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="r5134.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="r5268.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >comedi_get_write_subdevice</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="x4629.html#FUNCTIONREFERENCE" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >comedi_get_n_channels</TD ></TR ></TABLE ></DIV ></BODY ></HTML >