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<H2>
Module LF</H2>
<HR>
<P>
This module implements functions for Low Frequency communication. The input signal should have an header (see below) followed by several data bytes.
<P>
<P>
<B> Header timing:</B><p style="position:relative;" id="LF_time_0_p"><IMG SRC="LF_time_0.jpg" NAME="LF_time_0" BORDER="0"></p><SCRIPT type="text/javascript">window.setInterval("LF_time_0_res()",100);var LF_time_0_init = document.LF_time_0.width ;function LF_time_0_res(){try{if(LF_time_0_init > parent.classFrame.innerWidth-45) document.LF_time_0.width=parent.classFrame.innerWidth-45;else{ document.LF_time_0.width=LF_time_0_init; document.getElementById("LF_time_0_p").style.left= ((parent.classFrame.innerWidth-document.LF_time_0.width-45) / 2) + "px"; document.getElementById("LF_time_0_p").style.width= document.LF_time_0.width + "px";}}catch(Exception){}}</SCRIPT><B> A coded '1':</B><p style="position:relative;" id="LF_time_1_p"><IMG SRC="LF_time_1.jpg" NAME="LF_time_1" BORDER="0"></p><SCRIPT type="text/javascript">window.setInterval("LF_time_1_res()",100);var LF_time_1_init = document.LF_time_1.width ;function LF_time_1_res(){try{if(LF_time_1_init > parent.classFrame.innerWidth-45) document.LF_time_1.width=parent.classFrame.innerWidth-45;else{ document.LF_time_1.width=LF_time_1_init; document.getElementById("LF_time_1_p").style.left= ((parent.classFrame.innerWidth-document.LF_time_1.width-45) / 2) + "px"; document.getElementById("LF_time_1_p").style.width= document.LF_time_1.width + "px";}}catch(Exception){}}</SCRIPT><B> A coded '0':</B><p style="position:relative;" id="LF_time_2_p"><IMG SRC="LF_time_2.jpg" NAME="LF_time_2" BORDER="0"></p><SCRIPT type="text/javascript">window.setInterval("LF_time_2_res()",100);var LF_time_2_init = document.LF_time_2.width ;function LF_time_2_res(){try{if(LF_time_2_init > parent.classFrame.innerWidth-45) document.LF_time_2.width=parent.classFrame.innerWidth-45;else{ document.LF_time_2.width=LF_time_2_init; document.getElementById("LF_time_2_p").style.left= ((parent.classFrame.innerWidth-document.LF_time_2.width-45) / 2) + "px"; document.getElementById("LF_time_2_p").style.width= document.LF_time_2.width + "px";}}catch(Exception){}}</SCRIPT><HR>
<P>
<!-- =========== CONSTANT SUMMARY =========== -->
<A NAME="constant_summary"><!-- --></A>
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Constant Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> .4500</CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.T_HDR_INIT">LF.T_HDR_INIT</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> .600</CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.T_HDR_GAP">LF.T_HDR_GAP</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> .2250</CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.T_HDR_HIGH">LF.T_HDR_HIGH</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> .2250</CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.T_HDR_LOW">LF.T_HDR_LOW</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> .8</CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.TransmitBufferSize">LF.TransmitBufferSize</A></B></CODE>
<BR>
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> .250</CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.T_STEP">LF.T_STEP</A></B></CODE>
<BR>
</TD>
</TR>
</TABLE>
<P>
<!-- ========== METHOD SUMMARY =========== -->
<A NAME="method_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Function Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE></CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.Init">LF.Init</A></B>()</CODE>
<BR>
This function initializes the LF module.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE></CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.SendBuffer">LF.SendBuffer</A></B>()</CODE>
<BR>
This function sends the TransmitBuffer out.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE></CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.SendHeader">LF.SendHeader</A></B>()</CODE>
<BR>
This function sends the LF Header.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE></CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.TransmitByte">LF.TransmitByte</A></B>( w )</CODE>
<BR>
This function transmitts one byte of data over the LF interface.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE></CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.TransmitStop">LF.TransmitStop</A></B>()</CODE>
<BR>
This function transmitts a stop bit over the LF interface.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE></CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.FieldOn">LF.FieldOn</A></B>()</CODE>
<BR>
This function turns the LF-Field on.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE></CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.FieldOff">LF.FieldOff</A></B>()</CODE>
<BR>
This function turns the LF-Field off.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> STATUS,Z </CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.Buffer.addByte">LF.Buffer.addByte</A></B>( w )</CODE>
<BR>
This function adds one byte of data to the end of the transmit buffer.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> STATUS,Z </CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.Buffer.Write">LF.Buffer.Write</A></B>( w FSR1 )</CODE>
<BR>
This function overwrites the current transmit buffer with the data of another buffer.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> STATUS,Z </CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.Buffer.Append">LF.Buffer.Append</A></B>( w FSR1 )</CODE>
<BR>
This function appends the data of a given buffer at the end of the current transmit buffer.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE></CODE></FONT></TD>
<TD><CODE><B><A HREF="LF.html#LF.Buffer.Clear">LF.Buffer.Clear</A></B>()</CODE>
<BR>
This function clears the current transmit buffer.</TD>
</TR>
</TABLE>
<P>
<!-- ============ CONSTANT DETAIL =========== -->
<A NAME="constant_detail"><!-- --></A>
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Constant Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="LF.T_HDR_INIT"></A><H3>
LF.T_HDR_INIT</H3>
<DL>
<DD> This constant defines the length of the first high time in micro seconds on the LF-Line. It is used to give the receiver some time to adjust internal circuits to the signal strength of the following LF-transmission.<BR> You may override the default value by either defining the same constant in your Project.inc file or by changing the default value in the module's source.<BR><BR>Default value = .4500
<P>
<DL>
</DL>
</DL>
<B> Header timing:</B><p style="position:relative;" id="LF_T_HDR_INIT_time_0_p"><IMG SRC="LF.T_HDR_INIT_time_0.jpg" NAME="LF_T_HDR_INIT_time_0" BORDER="0"></p><SCRIPT type="text/javascript">window.setInterval("LF_T_HDR_INIT_time_0_res()",100);var LF_T_HDR_INIT_time_0_init = document.LF_T_HDR_INIT_time_0.width ;function LF_T_HDR_INIT_time_0_res(){try{if(LF_T_HDR_INIT_time_0_init > parent.classFrame.innerWidth-45) document.LF_T_HDR_INIT_time_0.width=parent.classFrame.innerWidth-45;else{ document.LF_T_HDR_INIT_time_0.width=LF_T_HDR_INIT_time_0_init; document.getElementById("LF_T_HDR_INIT_time_0_p").style.left= ((parent.classFrame.innerWidth-document.LF_T_HDR_INIT_time_0.width-45) / 2) + "px"; document.getElementById("LF_T_HDR_INIT_time_0_p").style.width= document.LF_T_HDR_INIT_time_0.width + "px";}}catch(Exception){}}</SCRIPT><HR>
<A NAME="LF.T_HDR_GAP"></A><H3>
LF.T_HDR_GAP</H3>
<DL>
<DD> This constant defines the length of the gap between the initial high time and the start of the Wake-up-Filter in micro seconds. It is used to detect the end of the initial high time and the beginning of the Wake-up-Filter.<BR> You may override the default value by either defining the same constant in your Project.inc file or by changing the default value in the module's source.<BR><BR>Default value = .600
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="LF.T_HDR_HIGH"></A><H3>
LF.T_HDR_HIGH</H3>
<DL>
<DD> This constant defines the length of Wake-up-Filter high time in micro seconds. It is used to filter other LF-sources or noise and keep the microcontroller in sleep mode.<BR> You may override the default value by either defining the same constant in your Project.inc file or by changing the default value in the module's source.<BR><BR>Default value = .2250
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="LF.T_HDR_LOW"></A><H3>
LF.T_HDR_LOW</H3>
<DL>
<DD> This constant defines the length of Wake-up-Filter low time in micro seconds. It is used to filter other LF-sources or noise and keep the microcontroller in sleep mode.<BR> You may override the default value by either defining the same constant in your Project.inc file or by changing the default value in the module's source.<BR><BR>Default value = .2250
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="LF.TransmitBufferSize"></A><H3>
LF.TransmitBufferSize</H3>
<DL>
<DD> This constant defines the length of the output buffer. It has to match the longest possible transmission length.<BR><BR> You may override the default value by either defining the same constant in your Project.inc file or by changing the default value in the module's source.<BR><BR>Default value = .8
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="LF.T_STEP"></A><H3>
LF.T_STEP</H3>
<DL>
<DD> This constant adjusts the bitrate of the transmission.<BR> You may override the default value by either defining the same constant in your Project.inc file or by changing the default value in the module's source.<BR><BR>Default value = .250
<P>
<DL>
</DL>
</DL>
<B> A coded '1':</B><p style="position:relative;" id="LF_T_STEP_time_0_p"><IMG SRC="LF.T_STEP_time_0.jpg" NAME="LF_T_STEP_time_0" BORDER="0"></p><SCRIPT type="text/javascript">window.setInterval("LF_T_STEP_time_0_res()",100);var LF_T_STEP_time_0_init = document.LF_T_STEP_time_0.width ;function LF_T_STEP_time_0_res(){try{if(LF_T_STEP_time_0_init > parent.classFrame.innerWidth-45) document.LF_T_STEP_time_0.width=parent.classFrame.innerWidth-45;else{ document.LF_T_STEP_time_0.width=LF_T_STEP_time_0_init; document.getElementById("LF_T_STEP_time_0_p").style.left= ((parent.classFrame.innerWidth-document.LF_T_STEP_time_0.width-45) / 2) + "px"; document.getElementById("LF_T_STEP_time_0_p").style.width= document.LF_T_STEP_time_0.width + "px";}}catch(Exception){}}</SCRIPT><B> A coded '0':</B><p style="position:relative;" id="LF_T_STEP_time_1_p"><IMG SRC="LF.T_STEP_time_1.jpg" NAME="LF_T_STEP_time_1" BORDER="0"></p><SCRIPT type="text/javascript">window.setInterval("LF_T_STEP_time_1_res()",100);var LF_T_STEP_time_1_init = document.LF_T_STEP_time_1.width ;function LF_T_STEP_time_1_res(){try{if(LF_T_STEP_time_1_init > parent.classFrame.innerWidth-45) document.LF_T_STEP_time_1.width=parent.classFrame.innerWidth-45;else{ document.LF_T_STEP_time_1.width=LF_T_STEP_time_1_init; document.getElementById("LF_T_STEP_time_1_p").style.left= ((parent.classFrame.innerWidth-document.LF_T_STEP_time_1.width-45) / 2) + "px"; document.getElementById("LF_T_STEP_time_1_p").style.width= document.LF_T_STEP_time_1.width + "px";}}catch(Exception){}}</SCRIPT><HR>
<P>
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="LF.Init"></A><H3>
LF.Init</H3>
<PRE>
<B>LF.Init</B>()</PRE>
<P>
<DL>
<DD> This function initializes the LF module.
<P>
<P>
<DD><DL>
<DT><B>Used SFRs:</B><DD> T2CON PR2 CCPR1L CCP1CON</DD></DL>
</DD>
<DD><DL>
<DT><B>Stacklevel:</B><DD>1</DD></DL>
</DD>
<DD><DL>
<DT><B>Status:</B><DD> Tested</DD></DL>
</DD>
</DL>
<HR>
<A NAME="LF.SendBuffer"></A><H3>
LF.SendBuffer</H3>
<PRE>
<B>LF.SendBuffer</B>()</PRE>
<P>
<DL>
<DD> This function sends the TransmitBuffer out.
<P>
<P>
<DD><DL>
<DT><B>Used SFRs:</B><DD>T0CON INTCON CCP1CON FSR2 E </DD></DL>
</DD>
<DD><DL>
<DT><B>Calls subroutines:</B><PRE> LF.SendHeader Delay.Mikros Delay.Start8 Delay.Start16⌨️ 快捷键说明
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