lf_pwm.html

汽车无钥进入系统设计,基于PIC单片机16F639,包括电路图和源码

<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>

<A NAME="LF.Send_Clamp_One"></A><H3>
LF.Send_Clamp_One</H3>
<PRE>
&nbsp;<B>LF.Send_Clamp_One</B>()</PRE>
<P>
<DL>
<DD>	This method sends a one over the LF antenna.

<P>
<P>
<DD><DL>
<DT><B>Used SFRs:</B><DD>     
    Delay.Returned

      
 
</DD></DL>
</DD>
<DD><DL>
<DT><B>Calls subroutines:</B>
<PRE>
	AFE.SendCMDClampON
		SPI.Write
	Delay.WaitFor
	AFE.SendCMDClampOFF
		SPI.Write

</PRE>
</DD></DL>
<DD><DL>
<DT><B>Stacklevel:</B><DD>2</DD></DL>
</DD>
<DD><DL>
<DT><B>Status:</B><DD> Under Construction (no test hardware available)

</DD></DL>
</DD>
</DL>
<HR>
<A NAME="LF.Send_Clamp_Zero"></A><H3>
LF.Send_Clamp_Zero</H3>
<PRE>
&nbsp;<B>LF.Send_Clamp_Zero</B>()</PRE>
<P>
<DL>
<DD>	This method sends a zero over the LF antenna.

<P>
<P>
<DD><DL>
<DT><B>Used SFRs:</B><DD>     
    Delay.Returned

      
 
</DD></DL>
</DD>
<DD><DL>
<DT><B>Calls subroutines:</B>
<PRE>
	AFE.SendCMDClampON
		SPI.Write
	Delay.WaitFor
	AFE.SendCMDClampOFF
		SPI.Write

</PRE>
</DD></DL>
<DD><DL>
<DT><B>Stacklevel:</B><DD>2</DD></DL>
</DD>
<DD><DL>
<DT><B>Status:</B><DD> Under Construction (no test hardware available)

</DD></DL>
</DD>
</DL>
<HR>
<A NAME="LF.Receive8"></A><H3>
LF.Receive8</H3>
<PRE>
&nbsp;w&nbsp;&nbsp;<B>LF.Receive8</B>()</PRE>
<P>
<DL>
<DD>	This method receives one byte over the LF-AFE

<P>
<DD><DL>
<DT><B>Returns:</B>
<DD><CODE>w</CODE> - The received data byte

 </DD>
</DL></DD>
<P>
<DD><DL>
<DT><B>Used SFRs:</B><DD>TMR0  PORTC   

    

 

</DD></DL>
</DD>
<DD><DL>
<DT><B>Stacklevel:</B><DD>2</DD></DL>
</DD>
<DD><DL>
<DT><B>Status:</B><DD> Tested

</DD></DL>
</DD>
</DL>
<HR>
<A NAME="LF.ReadBuffer"></A><H3>
LF.ReadBuffer</H3>
<PRE>
&nbsp;<B>LF.ReadBuffer</B>(&nbsp;w&nbsp;&nbsp;FSR&nbsp;)</PRE>
<P>
<DL>
<DD>	This method reads an specified amount of bytes from the LF-Input to a buffer.
	The buffer has to be within bank0 or bank1.

<P>
<DD><DL>
<DT><B>Parameters:</B>
<DD><CODE>w</CODE> - The amount of bytes to be read
 </DD>
<DD><CODE>FSR</CODE> - The start address of the buffer

 </DD>
</DL></DD>
<P>
<DD><DL>
<DT><B>Used SFRs:</B><DD>  
</DD></DL>
</DD>
<DD><DL>
<DT><B>Calls subroutines:</B>
<PRE>
	AFE.Receive8

</PRE>
</DD></DL>
<DD><DL>
<DT><B>Stacklevel:</B><DD>1</DD></DL>
</DD>
<DD><DL>
<DT><B>Status:</B><DD> Tested

</DD></DL>
</DD>
<P>
<DD><DL>
<DT><B>Example:</B><DD><CODE><TABLE BORDER="0"><TR>	<TD><CODE>&nbsp;</CODE></TD>
	<TD><CODE><FONT COLOR="#0000FF"><B>movlw&nbsp;</B></FONT></CODE></TD>
	<TD><CODE><FONT COLOR="#AA22AA">InputBuffer&nbsp;</FONT></CODE></TD>
</TR><TR>	<TD><CODE>&nbsp;</CODE></TD>
	<TD><CODE><FONT COLOR="#0000FF"><B>movwf&nbsp;</B></FONT></CODE></TD>
	<TD><CODE><FONT COLOR="#AA22AA">FSR&nbsp;</FONT></CODE></TD>
</TR><TR>	<TD><CODE>&nbsp;</CODE></TD>
	<TD><CODE><FONT COLOR="#0000FF"><B>movlw&nbsp;</B></FONT></CODE></TD>
	<TD><CODE><FONT COLOR="#AA22AA">0x04&nbsp;</FONT></CODE></TD>
</TR><TR>	<TD><CODE>&nbsp;</CODE></TD>
	<TD><CODE><FONT COLOR="#0000FF"><B>call&nbsp;</B></FONT></CODE></TD>
	<TD><CODE><FONT COLOR="#AA22AA">AFE.ReadBuffer&nbsp;</FONT></CODE></TD>
</TR></TABLE></CODE></DD></DL>
</DD>
<DD><DL>
<DT><B>Description:</B><DD>
 This reads 4 bytes from the LF-Input to the buffer "InputBuffer"

</DD></DL>
</DD>
</DL>
<HR>
<A NAME="LF.Send8"></A><H3>
LF.Send8</H3>
<PRE>
&nbsp;<B>LF.Send8</B>()</PRE>
<P>
<DL>
<DD>	This method transmits one byte over the LF-AFE

<P>
<P>
<DD><DL>
<DT><B>Used SFRs:</B><DD>Delay.Returned        
    

      
 
        
    

      
 
 
</DD></DL>
</DD>
<DD><DL>
<DT><B>Calls subroutines:</B>
<PRE>
	LF.Send_Clamp_One
		AFE.SendCMDClampON
			SPI.Write
		Delay.WaitFor
		AFE.SendCMDClampOFF
			SPI.Write
	LF.Send_Clamp_Zero
		AFE.SendCMDClampON
			SPI.Write
		Delay.WaitFor
		AFE.SendCMDClampOFF
			SPI.Write

</PRE>
</DD></DL>
<DD><DL>
<DT><B>Stacklevel:</B><DD>3</DD></DL>
</DD>
<DD><DL>
<DT><B>Status:</B><DD> Under Construction (no test hardware available)

</DD></DL>
</DD>
</DL>
<HR>
<A NAME="LF.SendBuffer"></A><H3>
LF.SendBuffer</H3>
<PRE>
&nbsp;<B>LF.SendBuffer</B>(&nbsp;w&nbsp;&nbsp;FSR&nbsp;)</PRE>
<P>
<DL>
<DD>	This function sends a complete data buffer to the air.
	The Buffer has to be on Bank0 or Bank1

<P>
<DD><DL>
<DT><B>Parameters:</B>
<DD><CODE>w</CODE> - The amount of bytes to be sent
 </DD>
<DD><CODE>FSR</CODE> - The start address of the buffer

 </DD>
</DL></DD>
<P>
<DD><DL>
<DT><B>Used SFRs:</B><DD>Delay.Returned          
    

      
 
        
    

      
 
 
 
</DD></DL>
</DD>
<DD><DL>
<DT><B>Calls subroutines:</B>
<PRE>
	LF.Send8
		LF.Send_Clamp_One
			AFE.SendCMDClampON
				SPI.Write
			Delay.WaitFor
			AFE.SendCMDClampOFF
				SPI.Write
		LF.Send_Clamp_Zero
			AFE.SendCMDClampON
				SPI.Write
			Delay.WaitFor
			AFE.SendCMDClampOFF
				SPI.Write

</PRE>
</DD></DL>
<DD><DL>
<DT><B>Stacklevel:</B><DD>4</DD></DL>
</DD>
<DD><DL>
<DT><B>Status:</B><DD> Tested

</DD></DL>
</DD>
<P>
<DD><DL>
<DT><B>Example:</B><DD><CODE><TABLE BORDER="0"><TR>	<TD><CODE>&nbsp;</CODE></TD>
	<TD><CODE><FONT COLOR="#0000FF"><B>movlw&nbsp;</B></FONT></CODE></TD>
	<TD><CODE><FONT COLOR="#AA22AA">SerialNumber&nbsp;</FONT></CODE></TD>
	<TD><CODE><FONT COLOR="#22AAAA">;move start address to w&nbsp;</FONT></CODE></TD>
</TR><TR>	<TD><CODE>&nbsp;</CODE></TD>
	<TD><CODE><FONT COLOR="#0000FF"><B>movwf&nbsp;</B></FONT></CODE></TD>
	<TD><CODE><FONT COLOR="#AA22AA">FSR&nbsp;</FONT></CODE></TD>
	<TD><CODE><FONT COLOR="#22AAAA">;write start address to fsr&nbsp;</FONT></CODE></TD>
</TR><TR>	<TD><CODE>&nbsp;</CODE></TD>
	<TD><CODE><FONT COLOR="#0000FF"><B>movlw&nbsp;</B></FONT></CODE></TD>
	<TD><CODE><FONT COLOR="#AA22AA">0x04&nbsp;</FONT></CODE></TD>
	<TD><CODE><FONT COLOR="#22AAAA">;move number of bytes to transmit to w&nbsp;</FONT></CODE></TD>
</TR><TR>	<TD><CODE>&nbsp;</CODE></TD>
	<TD><CODE><FONT COLOR="#0000FF"><B>call&nbsp;</B></FONT></CODE></TD>
	<TD><CODE><FONT COLOR="#AA22AA">AFE.SendBuffer&nbsp;</FONT></CODE></TD>
	<TD><CODE><FONT COLOR="#22AAAA">;send it via LF-Talkback&nbsp;</FONT></CODE></TD>
</TR></TABLE></CODE></DD></DL>
</DD>
<DD><DL>
<DT><B>Description:</B><DD>
 This sends 4 bytes of the buffer "SerialNumber" to the air 

</DD></DL>
</DD>
</DL>
<HR>
<A NAME="LF.DetectFalling"></A><H3>
LF.DetectFalling</H3>
<PRE>
&nbsp;<B>LF.DetectFalling</B>()</PRE>
<P>
<DL>
<DD>	Internal use only.
	This function detects a falling edge on the LF input pin.
	It will debounce this pin with the given timing constants.

<P>
<P>
<DD><DL>
<DT><B>Used SFRs:</B><DD> TMR0

</DD></DL>
</DD>
<DD><DL>
<DT><B>Stacklevel:</B><DD>1</DD></DL>
</DD>
</DL>
<HR>
<A NAME="LF.DetectRising"></A><H3>
LF.DetectRising</H3>
<PRE>
&nbsp;<B>LF.DetectRising</B>()</PRE>
<P>
<DL>
<DD>	Internal use only.
	This function detects a rising edge on the LF input pin.
	It will debounce this pin with the given timing constants.

<P>
<P>
<DD><DL>
<DT><B>Used SFRs:</B><DD> TMR0

</DD></DL>
</DD>
<DD><DL>
<DT><B>Stacklevel:</B><DD>1</DD></DL>
</DD>
</DL>
<HR>
&nbsp;
<!-- ========= END OF CLASS DATA ========= -->




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