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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Procyon AVRlib: xmodem.c Source File</title><link href="dox.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.2 --><div class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data Structures</a> | <a class="qindex" href="dirs.html">Directories</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Data Fields</a> | <a class="qindex" href="globals.html">Globals</a> | <a class="qindex" href="pages.html">Related Pages</a></div><h1>xmodem.c</h1><a href="xmodem_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file xmodem.c \brief XModem Transmit/Receive Implementation with CRC and 1K support. */</span>00002 <span class="comment">//*****************************************************************************</span>00003 <span class="comment">//</span>00004 <span class="comment">// File Name : 'xmodem.c'</span>00005 <span class="comment">// Title : XModem Transmit/Receive Implementation with CRC and 1K support</span>00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2006</span>00007 <span class="comment">// Created : 4/22/2006</span>00008 <span class="comment">// Revised : 7/22/2006</span>00009 <span class="comment">// Version : 0.1</span>00010 <span class="comment">// Target MCU : AVR processors</span>00011 <span class="comment">// Editor Tabs : 4</span>00012 <span class="comment">//</span>00013 <span class="comment">// This code is distributed under the GNU Public License</span>00014 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>00015 <span class="comment">//</span>00016 <span class="comment">//*****************************************************************************</span>00017 00018 <span class="preprocessor">#include <string.h></span>00019 <span class="preprocessor">#include "<a class="code" href="rprintf_8h.html">rprintf.h</a>"</span>00020 <span class="preprocessor">#include "<a class="code" href="timer_8h.html">timer.h</a>"</span>00021 00022 <span class="preprocessor">#include "<a class="code" href="xmodem_8h.html">xmodem.h</a>"</span>00023 00024 <span class="comment">//#define XMODEM_BUFFER_SIZE 128</span>00025 <span class="preprocessor">#define XMODEM_BUFFER_SIZE 1024</span>00026 <span class="preprocessor"></span>00027 <span class="comment">// pointers to stream I/O functions</span>00028 <span class="keyword">static</span> void (*xmodemOut)(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c);00029 <span class="keyword">static</span> int (*xmodemIn)(void);00030 <a name="l00031"></a><a class="code" href="group__xmodem.html#ga0">00031</a> <span class="keywordtype">void</span> <a class="code" href="group__xmodem.html#ga0">xmodemInit</a>(<span class="keywordtype">void</span> (*sendbyte_func)(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c), <span class="keywordtype">int</span> (*getbyte_func)(<span class="keywordtype">void</span>))00032 {00033 <span class="comment">// assign function pointers</span>00034 xmodemOut = sendbyte_func;00035 xmodemIn = getbyte_func;00036 }00037 <a name="l00038"></a><a class="code" href="group__xmodem.html#ga1">00038</a> <span class="keywordtype">long</span> <a class="code" href="group__xmodem.html#ga1">xmodemReceive</a>( <span class="keywordtype">int</span> (*write)(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>* buffer, <span class="keywordtype">int</span> size) )00039 {00040 <span class="comment">// create xmodem buffer</span>00041 <span class="comment">// 1024b for Xmodem 1K</span>00042 <span class="comment">// 128 bytes for Xmodem std.</span>00043 <span class="comment">// + 5b header/crc + NULL</span>00044 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> xmbuf[XMODEM_BUFFER_SIZE+6];00045 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> seqnum=1; <span class="comment">// xmodem sequence number starts at 1</span>00046 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> pktsize=128; <span class="comment">// default packet size is 128 bytes</span>00047 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> response=<span class="charliteral">'C'</span>; <span class="comment">// solicit a connection with CRC enabled</span>00048 <span class="keywordtype">char</span> retry=XMODEM_RETRY_LIMIT;00049 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> crcflag=0;00050 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> totalbytes=0;00051 <span class="keywordtype">int</span> i,c;00052 00053 <span class="keywordflow">while</span>(retry > 0)00054 {00055 <span class="comment">// solicit a connection/packet</span>00056 xmodemOut(response);00057 <span class="comment">// wait for start of packet</span>00058 <span class="keywordflow">if</span>( (c = <a class="code" href="group__xmodem.html#ga4">xmodemInTime</a>(XMODEM_TIMEOUT_DELAY)) >= 0)00059 {00060 <span class="keywordflow">switch</span>(c)00061 {00062 <span class="keywordflow">case</span> SOH:00063 pktsize = 128;00064 <span class="keywordflow">break</span>;00065 <span class="preprocessor"> #if(XMODEM_BUFFER_SIZE>=1024)</span>00066 <span class="preprocessor"></span> <span class="keywordflow">case</span> STX:00067 pktsize = 1024;00068 <span class="keywordflow">break</span>;00069 <span class="preprocessor"> #endif</span>00070 <span class="preprocessor"></span> <span class="keywordflow">case</span> EOT:00071 <a class="code" href="group__xmodem.html#ga5">xmodemInFlush</a>();00072 xmodemOut(ACK);00073 <span class="comment">// completed transmission normally</span>00074 <span class="keywordflow">return</span> totalbytes;00075 <span class="keywordflow">case</span> CAN:00076 <span class="keywordflow">if</span>((c = <a class="code" href="group__xmodem.html#ga4">xmodemInTime</a>(XMODEM_TIMEOUT_DELAY)) == CAN)00077 {00078 <a class="code" href="group__xmodem.html#ga5">xmodemInFlush</a>();00079 xmodemOut(ACK);00080 <span class="comment">// transaction cancelled by remote node</span>00081 <span class="keywordflow">return</span> XMODEM_ERROR_REMOTECANCEL;00082 }00083 <span class="keywordflow">default</span>:00084 <span class="keywordflow">break</span>;00085 }00086 }00087 <span class="keywordflow">else</span>00088 {00089 <span class="comment">// timed out, try again</span>00090 <span class="comment">// no need to flush because receive buffer is already empty</span>00091 retry--;00092 <span class="comment">//response = NAK;</span>00093 <span class="keywordflow">continue</span>;00094 }00095 00096 <span class="comment">// check if CRC mode was accepted</span>00097 <span class="keywordflow">if</span>(response == <span class="charliteral">'C'</span>) crcflag = 1;00098 <span class="comment">// got SOH/STX, add it to processing buffer</span>00099 xmbuf[0] = c;00100 <span class="comment">// try to get rest of packet</span>00101 <span class="keywordflow">for</span>(i=0; i<(pktsize+crcflag+4-1); i++)00102 {00103 <span class="keywordflow">if</span>((c = <a class="code" href="group__xmodem.html#ga4">xmodemInTime</a>(XMODEM_TIMEOUT_DELAY)) >= 0)00104 {00105 xmbuf[1+i] = c;00106 }00107 <span class="keywordflow">else</span>00108 {00109 <span class="comment">// timed out, try again</span>00110 retry--;00111 <a class="code" href="group__xmodem.html#ga5">xmodemInFlush</a>();00112 response = NAK;00113 <span class="keywordflow">break</span>;00114 }00115 }00116 <span class="comment">// packet was too small, retry</span>00117 <span class="keywordflow">if</span>(i<(pktsize+crcflag+4-1))00118 <span class="keywordflow">continue</span>;00119 00120 <span class="comment">// got whole packet</span>00121 <span class="comment">// check validity of packet</span>00122 <span class="keywordflow">if</span>( (xmbuf[1] == (<span class="keywordtype">unsigned</span> char)(~xmbuf[2])) && <span class="comment">// sequence number was transmitted w/o error</span>00123 <a class="code" href="group__xmodem.html#ga3">xmodemCrcCheck</a>(crcflag, &xmbuf[3], pktsize) ) <span class="comment">// packet is not corrupt</span>⌨️ 快捷键说明
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