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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所以在</SPAN><SPAN
lang=EN-US>MICROCHIP</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（美国微芯）的滚动码系列芯片中较为普遍的采用了另外的一种格式：</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt" align=center><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><A
href="zbcaich's Blog.files/092fbc8a-1b87-4cb2-8940-906584721433.jpg"
target=_blank><IMG height=284 alt=点击看大图
src="zbcaich's Blog.files/092fbc8a-1b87-4cb2-8940-906584721433.jpg"
width=400></A></SPAN></P>
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style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><A
href="http://blog.ednchina.com/Upload/Blog/2007/6/21/5d14ec6b-6bac-4cb3-8ce5-6002cc45f55d.JPG"
target=_blank></A></SPAN></P>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><v:line id=_x0000_s1053
style="Z-INDEX: 28; LEFT: 0px; POSITION: absolute; TEXT-ALIGN: left"
from="189pt,0" to="225pt,0"></v:line><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">
图</SPAN><SPAN lang=EN-US>2</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><v:line id=_x0000_s1048
style="Z-INDEX: 23; LEFT: 0px; POSITION: absolute; TEXT-ALIGN: left"
from="199.5pt,474.15pt" to="235.5pt,474.15pt"></v:line><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这种方式较图</SPAN><SPAN
lang=EN-US>1</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的发射效率又要高一点。每位数据都要紧骤</SPAN><st1:chmetcnv
UnitName="a" SourceValue="1" HasSpace="False" Negative="False" NumberType="1"
TCSC="0" w:st="on"><SPAN lang=EN-US>1a</SPAN></st1:chmetcnv><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。它发射</SPAN><SPAN
lang=EN-US>1</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">串完整的滚动码数据需要</SPAN><st1:chmetcnv
UnitName="a" SourceValue="225" HasSpace="False" Negative="False" NumberType="1"
TCSC="0" w:st="on"><SPAN lang=EN-US>225a</SPAN></st1:chmetcnv><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN><SPAN
lang=EN-US>a</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的宽度是</SPAN><SPAN
lang=EN-US>100</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">－</SPAN><SPAN
lang=EN-US>400us</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，所以整串数据的时间是</SPAN><SPAN
lang=EN-US>27</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">－</SPAN><SPAN
lang=EN-US>108ms</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。事实上发射时间越短对接收模块的指标要求越高。这也是采用滚动码发射时接收一般都用超外差接收，而不能用廉价的超再生接收的原因，因为这样的话容易丢码！</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在低传输速率的无线数据传送中较少有用曼彻斯特编码方式的，个中原因笔者不敢妄测。由于笔者在新的加解密算法中要传送</SPAN><SPAN
lang=EN-US>72</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">位数据，在接收上仍然使用了较廉价的超再生接收电路，为了尽可能的减少丢码等接收不全的现像，发送方面采用了较宽的脉冲宽度（</SPAN><SPAN
lang=EN-US>300us</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">），编码方式采用的曼彻斯特编码方式。在网上没有找到相关的接收资料，于是对曼彻斯特编码的接收作了仔细分析，遂采用以下方法：</SPAN></P>
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lang=EN-US><o:p> </o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US>1</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 同步头的改变 由于数据的前半部份有可能是数字低电平，于是在同步头的后面加了一个脉冲。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt" align=center><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><A
href="zbcaich's Blog.files/83b334f7-debf-4844-8a23-da76468cbe7d.jpg"
target=_blank><IMG height=152 alt=点击看大图
src="zbcaich's Blog.files/83b334f7-debf-4844-8a23-da76468cbe7d.jpg"
width=400></A></SPAN></P>
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style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><A
href="http://blog.ednchina.com/Upload/Blog/2007/6/21/f10d49d6-e822-4e6a-80fa-5906b97ffabf.JPG"
target=_blank></A></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 84pt; mso-char-indent-count: 8.0">
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US></SPAN></P><v:line id=_x0000_s1066
style="Z-INDEX: 41; LEFT: 0px; POSITION: absolute; TEXT-ALIGN: left"
from="270pt,0" to="306pt,0"></v:line><v:line id=_x0000_s1065
style="Z-INDEX: 40; LEFT: 0px; POSITION: absolute; TEXT-ALIGN: left"
from="126pt,0" to="162pt,0"></v:line><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 图</SPAN><SPAN
lang=EN-US>3</SPAN>
<P></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US>2</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 启用</SPAN><SPAN
lang=EN-US>MCU</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的端口电平变化中断 在每一个电平发生变化后产生中断以实时对接收数据进行处理。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">具体程序如下：</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><A
href="http://blog.ednchina.com/Upload/Blog/2007/6/26/55c47da1-d1cd-4921-bd95-eb7675134064.rar"
target=_blank><IMG alt=rar src="zbcaich's Blog.files/rar.gif"></A></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt">
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US></SPAN></P><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以上程序经过测试，是完全可以对曼彻斯特编码作完整接收的。</SPAN>
<P></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有必要对以上程序作个说明：</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><SPAN
lang=EN-US style="mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">1<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以上程序的仿真是用的</SPAN><SPAN
lang=EN-US>MPLAB</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> </SPAN><SPAN
lang=EN-US>IDE7.40</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><SPAN
lang=EN-US style="mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">2<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中断初值为</SPAN><SPAN
lang=EN-US>0</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，即最长时间中断。</SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><SPAN
lang=EN-US style="mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">3<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时钟为</SPAN><st1:chmetcnv
UnitName="m" SourceValue="4" HasSpace="False" Negative="False" NumberType="1"
TCSC="0" w:st="on"><SPAN lang=EN-US>4M</SPAN></st1:chmetcnv></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 18pt; TEXT-INDENT: -18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt"><SPAN
lang=EN-US style="mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">4<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">仿真波形定义的脉冲宽度为</SPAN><SPAN
lang=EN-US>300us</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><o:p> </o:p></SPAN></P>
<P> </P></DIV>
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<TD class=article_more_left_value><A
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<TD class=article_more_left_value><A title=曼彻斯特
href="http://blog.ednchina.com/lable/Âü³¹Ë¹ÌØ.aspx">曼彻斯特</A> <A title=滚动码
href="http://blog.ednchina.com/lable/¹ö¶¯Âë.aspx">滚动码</A> </TD></TR>
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<DIV class=article_title><A
href="http://blog.ednchina.com/zbcaich/32252/message.aspx">基于单片机的无线遥控系统
</A></DIV>
<DIV class=article_info>发表于 2007-6-12 22:34:27 </DIV>
<DIV class=article_content>
<P> 目前市面上的无线遥控系统多采用专用编码器电路，固定码的有2262,1527等，它们的应用电路大都是用按键控制编码器的电源（直接或间接），当按下按键时就接通编码器的电源供电，编码器得电而工作。</P>
<P> 鉴于现下的单片机的功耗是越做越低，体积也越来越小，其休眠电流已可以做到1uA以下，用它来做无线遥控系统中发射编电路以成为可能。在用单片机做发射时，采用3－3.6伏直接供电，用按键接其I/O口于地，打开单片机的弱上拉功能，其硬件设计会大大简化。在软件上设计上，平时没键按下的时候单片机处于休眠状态，有按键按下时就唤醒单片机，单片机就按特定的算法发出数据编码，发完后检测按键是否放开，没放开继续发射，否则就又进入睡眠状态，以保持其低功耗。</P>
<P> 在数据编码时，可以进行简单的CRC校验，也可以用保密性很高的滚动码算法，使用软件来做滚动码算法的优点是软硬件都由自己把握，设计余量很大并且没有一般的滚动码的漏洞存在！</P></DIV>
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