📄 通过串口接受短消息.html
字号:
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>91<o:p></o:p></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>SMSC</span><span style='font-size:
9.0pt;line-height:150%'>地址格式<span lang=EN-US>(TON/NPI)<o:p></o:p></span></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>用国际格式号码<span lang=EN-US>(</span>在前面加‘<span lang=EN-US>+</span>’<span
lang=EN-US>)<o:p></o:p></span></span></p>
</td>
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<tr style='mso-yfti-irow:3'>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>68 31 08 20 05 05 F0<o:p></o:p></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>SMSC</span><span style='font-size:
9.0pt;line-height:150%'>地址<span lang=EN-US><o:p></o:p></span></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>8613800250500</span><span
style='font-size:9.0pt;line-height:150%'>，补‘<span lang=EN-US>F</span>’凑成偶数个<span
lang=EN-US><o:p></o:p></span></span></p>
</td>
</tr>
<tr style='mso-yfti-irow:4'>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>84<o:p></o:p></span></p>
</td>
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<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>基本参数<span lang=EN-US>(TP-MTI/MMS/RP)<o:p></o:p></span></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>接收，无更多消息，有回复地址<span lang=EN-US><o:p></o:p></span></span></p>
</td>
</tr>
<tr style='mso-yfti-irow:5'>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>0D<o:p></o:p></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>回复地址数字个数<span lang=EN-US><o:p></o:p></span></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>共<span lang=EN-US>13</span>个十进制数<span lang=EN-US>(</span>不包括<span
lang=EN-US>91</span>和‘<span lang=EN-US>F</span>’<span lang=EN-US>)<o:p></o:p></span></span></p>
</td>
</tr>
<tr style='mso-yfti-irow:6'>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>91<o:p></o:p></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>回复地址格式<span lang=EN-US>(TON/NPI)<o:p></o:p></span></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>用国际格式号码<span lang=EN-US>(</span>在前面加‘<span lang=EN-US>+</span>’<span
lang=EN-US>)<o:p></o:p></span></span></p>
</td>
</tr>
<tr style='mso-yfti-irow:7'>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>68 31 58 81 27 64 F8<o:p></o:p></span></p>
</td>
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<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>回复地址<span lang=EN-US>(TP-RA)<o:p></o:p></span></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>8613851872468</span><span
style='font-size:9.0pt;line-height:150%'>，补‘<span lang=EN-US>F</span>’凑成偶数个<span
lang=EN-US><o:p></o:p></span></span></p>
</td>
</tr>
<tr style='mso-yfti-irow:8'>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>00<o:p></o:p></span></p>
</td>
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<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>协议标识<span lang=EN-US>(TP-PID)<o:p></o:p></span></span></p>
</td>
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<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>是普通<span lang=EN-US>GSM</span>类型，点到点方式<span lang=EN-US><o:p></o:p></span></span></p>
</td>
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<tr style='mso-yfti-irow:9'>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>08<o:p></o:p></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>用户信息编码方式<span lang=EN-US>(TP-DCS)<o:p></o:p></span></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>UCS2</span><span style='font-size:
9.0pt;line-height:150%'>编码<span lang=EN-US><o:p></o:p></span></span></p>
</td>
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<tr style='mso-yfti-irow:10'>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>30 30 21 80 63 54 80<o:p></o:p></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>时间戳<span lang=EN-US>(TP-SCTS)<o:p></o:p></span></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>2003-3-12 08:36:45 +8</span><span
style='font-size:9.0pt;line-height:150%'>时区<span lang=EN-US><o:p></o:p></span></span></p>
</td>
</tr>
<tr style='mso-yfti-irow:11'>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>06<o:p></o:p></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>用户信息长度<span lang=EN-US>(TP-UDL)<o:p></o:p></span></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>实际长度<span lang=EN-US>6</span>个字节<span lang=EN-US><o:p></o:p></span></span></p>
</td>
</tr>
<tr style='mso-yfti-irow:12;mso-yfti-lastrow:yes'>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'>4F 60 59 7D 00 21<o:p></o:p></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>用户信息<span lang=EN-US>(TP-UD)<o:p></o:p></span></span></p>
</td>
<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='line-height:150%'><span style='font-size:9.0pt;
line-height:150%'>“你好<span lang=EN-US>!</span>”<span lang=EN-US><o:p></o:p></span></span></p>
</td>
</tr>
</table>
</div>
<p style='line-height:150%;word-break:break-all'><span style='font-size:9.0pt;
line-height:150%'>若基本参数的最高位<span lang=EN-US>(TP-RP)</span>为<span lang=EN-US>0</span>，则没有回复地址的三个段。从<span
lang=EN-US>Internet</span>上发出的短消息常常是这种情形。<span lang=EN-US><br>
</span>注意号码和时间的表示方法，不是按正常顺序顺着来的，而且要以‘<span lang=EN-US>F</span>’将奇数补成偶数。<span
lang=EN-US><o:p></o:p></span></span></p>
<p style='line-height:150%;word-break:break-all'><span lang=EN-US
style='font-size:9.0pt;line-height:150%'><br>
</span><strong><span lang=EN-US style='font-size:18.0pt;line-height:150%;
font-family:宋体;mso-bidi-font-family:宋体'>Q</span></strong><span lang=EN-US
style='font-size:9.0pt;line-height:150%'> </span><span style='font-size:9.0pt;
line-height:150%'>上面两例中已经出现了<span lang=EN-US>7-bit</span>和<span lang=EN-US>UCS2</span>编码，请详细介绍一下这些编码方式？<span
lang=EN-US><o:p></o:p></span></span></p>
<p style='line-height:150%;word-break:break-all'><strong><span lang=EN-US
style='font-size:18.0pt;line-height:150%;font-family:宋体;mso-bidi-font-family:
宋体'>A</span></strong><span lang=EN-US style='font-size:9.0pt;line-height:
150%'> </span><span style='font-size:9.0pt;line-height:150%'>在<span
lang=EN-US>PDU Mode</span>中，可以采用三种编码方式来对发送的内容进行编码，它们是<span lang=EN-US>7-bit</span>、<span
lang=EN-US>8-bit</span>和<span lang=EN-US>UCS2</span>编码。<span lang=EN-US>7-bit</span>编码用于发送普通的<span
lang=EN-US>ASCII</span>字符，它将一串<span lang=EN-US>7-bit</span>的字符<span
lang=EN-US>(</span>最高位为<span lang=EN-US>0)</span>编码成<span lang=EN-US>8-bit</span>的数据，每<span
lang=EN-US>8</span>个字符可“压缩”成<span lang=EN-US>7</span>个；<span lang=EN-US>8-bit</span>编码通常用于发送数据消息，比如图片和铃声等；而<span
lang=EN-US>UCS2</span>编码用于发送<span lang=EN-US>Unicode</span>字符。<span
lang=EN-US>PDU</span>串的用户信息<span lang=EN-US>(TP-UD)</span>段最大容量是<span
lang=EN-US>140</span>字节，所以在这三种编码方式下，可以发送的短消息的最大字符数分别是<span lang=EN-US>160</span>、<span
lang=EN-US>140</span>和<span lang=EN-US>70</span>。这里，将一个英文字母、一个汉字和一个数据字节都视为一个字符。<span
lang=EN-US><br>
</span>需要注意的是，<span lang=EN-US>PDU</span>串的用户信息长度<span lang=EN-US>(TP-UDL)</span>，在各种编码方式下意义有所不同。<span
lang=EN-US>7-bit</span>编码时，指原始短消息的字符个数，而不是编码后的字节数。<span lang=EN-US>8-bit</span>编码时，就是字节数。<span
lang=EN-US>UCS2</span>编码时，也是字节数，等于原始短消息的字符数的两倍。如果用户信息<span lang=EN-US>(TP-UD)</span>中存在一个头<span
lang=EN-US>(</span>基本参数的<span lang=EN-US>TP-UDHI</span>为<span lang=EN-US>1)</span>，在所有编码方式下，用户信息长度<span
lang=EN-US>(TP-UDL)</span>都等于头长度与编码后字节数之和。如果采用<span lang=EN-US>GSM 03.42</span>所建议的压缩算法<span
lang=EN-US>(TP-DCS</span>的高<span lang=EN-US>3</span>位为<span lang=EN-US>001)</span>，则该长度也是压缩编码后字节数或头长度与压缩编码后字节数之和。<span
lang=EN-US><o:p></o:p></span></span></p>
<p style='line-height:150%;word-break:break-all'><span style='font-size:9.0pt;
line-height:150%'>下面以一个具体的例子说明<span lang=EN-US>7-bit</span>编码的过程。我们对英文短信“<span
lang=EN-US>Hello!</span>”进行编码：<span lang=EN-US><br>
<br>
<img border=0 width=529 height=172 id="_x0000_i1036"
src="http://www.mcuchina.com/Article/UploadFiles/200411/20041124222437701.jpg"
alt=7-bit解码 align=absMiddle><o:p></o:p></span></span></p>
<p style='line-height:150%;word-break:break-all'><span style='font-size:9.0pt;
line-height:150%'>将源串每<span lang=EN-US>8</span>个字符分为一组<span lang=EN-US>(</span>这个例子中不满<span
lang=EN-US>8</span>个<span lang=EN-US>)</span>进行编码，在组内字符间压缩，但每组之间是没有什么联系的。<span
lang=EN-US><o:p></o:p></span></span></p>
<p style='line-height:150%;word-break:break-all'><span style='font-size:9.0pt;
line-height:150%'>用<span lang=EN-US>C</span>实现<span lang=EN-US>7-bit</span>编码和解码的算法如下：<span
lang=EN-US><o:p></o:p></span></span></p>
<pre style='line-height:150%;word-break:break-all'><span lang=EN-US>// 7-bit</span>编码</pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US>// pSrc: </span>源字符串指针</pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US>// pDst: </span>目标编码串指针</pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US>// nSrcLength: </span>源字符串长度</pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US>// </span>返回<span
lang=EN-US>: </span>目标编码串长度</pre><pre style='line-height:150%;word-break:
break-all'><span lang=EN-US>int gsmEncode7bit(const char* pSrc, unsigned char* pDst, int nSrcLength)</span></pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US>{</span></pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>int nSrc;<span style='mso-spacerun:yes'> </span>// </span>源字符串的计数值</pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>int nDst;<span style='mso-spacerun:yes'> </span>// </span>目标编码串的计数值</pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>int nChar;<span style='mso-spacerun:yes'> </span>// </span>当前正在处理的组内字符字节的序号，范围是<span
lang=EN-US>0-7</span></pre><pre style='line-height:150%;word-break:break-all'><span
lang=EN-US><span style='mso-spacerun:yes'> </span>unsigned char nLeft;<span style='mso-spacerun:yes'> </span>// </span>上一字节残余的数据</pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span></span></pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>// </span>计数值初始化</pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>nSrc = 0;</span></pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>nDst = 0;</span></pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span></span></pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>// </span>将源串每<span
lang=EN-US>8</span>个字节分为一组，压缩成<span lang=EN-US>7</span>个字节</pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>// </span>循环该处理过程，直至源串被处理完</pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>// </span>如果分组不到<span
lang=EN-US>8</span>字节，也能正确处理</pre><pre style='line-height:150%;word-break:
break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>while(nSrc<nSrcLength)</span></pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>{</span></pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>// </span>取源字符串的计数值的最低<span
lang=EN-US>3</span>位</pre><pre style='line-height:150%;word-break:break-all'><span
lang=EN-US><span style='mso-spacerun:yes'> </span>nChar = nSrc & 7;</span></pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span></span></pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>// </span>处理源串的每个字节</pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>if(nChar == 0)</span></pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>{</span></pre><pre
style='line-height:150%;word-break:break-all'><span lang=EN-US><span style='mso-spacerun:yes'> </span>// </span>组内第一个字节，只是保存起来，待处理下一个字节时使用</pre><pre
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