<!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 -- 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 <comedilib.h></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 >