/usr/share/doc/libcomedi-dev/html/r5697.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>comedi_from_physical</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_from_phys"
HREF="r5673.html"><LINK
REL="NEXT"
TITLE="comedi_data_read"
HREF="r5725.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="r5673.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="r5725.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="FUNC-REF-COMEDI-FROM-PHYSICAL"
></A
>comedi_from_physical</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN5701"
></A
><H2
>Name</H2
>comedi_from_physical&nbsp;--&nbsp;convert physical units to sample</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN5704"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN5705"
></A
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include &lt;comedilib.h&gt;</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>lsampl_t comedi_from_physical</CODE
>(double data, const comedi_polynomial_t *conversion_polynomial);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN5714"
></A
><H2
>      Description
    </H2
><P
>Converts <CODE
CLASS="PARAMETER"
>data</CODE
> given in physical units into Comedi's
integer sample values
(lsampl_t, between 0 and maxdata).  The <CODE
CLASS="PARAMETER"
>conversion_polynomial</CODE
>
parameter is obtained from either comedi_get_hardcal_converter()
or comedi_get_softcal_converter().  The result will be rounded
using the C library's current rounding direction.
No range checking of the input
<CODE
CLASS="PARAMETER"
>data</CODE
> is performed.  It is up to you to insure
your data is within the limits of the output range you are using.</P
><P
>This function is intended to supplant comedi_from_phys(), and was
introduced in order to support software calibrations.
    </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN5721"
></A
><H2
>      Return value
    </H2
><P
>Comedi sample value corresponding to input physical value.</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="r5673.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="r5725.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>comedi_from_phys</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_data_read</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>
libcomedi-dev 0.8.1-5ubuntu6 / usr / share / doc / libcomedi-dev / html / r5697.html
