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<!DOCTYPE <h <t <link </head><body> <!-- <div <h 00002 00003 00004 00005 00006 00007 00008 00009 00010 00011 00012 00013 00014 00015 00016 00017 00018 00019 00020 00021 00022 00023 00024 00025 00026 00027 00028 00029 00030 <a 00032 { 00033 00034 00035 00036 } 00037 <a 00039 { 00040 00041 00042 00043 00044 00045 00046 00047 00048 00049 00050 00051 00052 00053 00054 { 00055 00056 00057 00058 00059 { 00060 00061 { 00062 00063 00064 00065 00066 00067 00068 00069 00070 00071 00072 00073 00074 00075 00076 00077 { 00078 00079 00080 00081 00082 } 00083 00084 00085 } 00086 } 00087 00088 { 00089 00090 00091 retry--; 00092 00093 00094 } 00095 00096 00097 00098 00099 00100 00101 00102 { 00103 00104 { 00105 00106 } 00107 00108 { 00109 00110 00111 00112 00113 00114 } 00115 } 00116 00117 00118 00119 00120 00121 00122 00123 00124 { 00125 00126 00127 { 00128 00129 00130 00131 00132 00133 00134 00135 00136 00137 00138 00139 } 00140 00141 { 00142 00143 00144 00145 00146 } 00147 00148 { 00149 00150 00151 00152 00153 00154 00155 00156 } 00157 } 00158 00159 { 00160 00161 00162 retry--; 00163 00164 00165 00166 } 00167 } 00168 00169 00170 00171 xmodemOut(CAN); 00172 xmodemOut(CAN); 00173 xmodemOut(CAN); 00174 00175 } 00176 00177 <a 00179 { 00180 00181 00182 } 00183 00184 00185 { 00186 00187 00188 00189 00190 { 00191 00192 00193 00194 00195 } 00196 00197 00198 } 00199 <a 00201 { 00202 00203 00204 00205 00206 { 00207 00208 00209 00210 00211 00212 00213 00214 00215 } 00216 00217 { 00218 00219 00220 00221 00222 { 00223 00224 } 00225 00226 00227 00228 } 00229 00230 00231 } 00232 00233 <a 00235 { 00236 00237 00238 00239 00240 00241 00242 } 00243 <a 00245 { 00246 00247 } </ <a <img </body> </html>

HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> tml><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> itle>Procyon AVRlib: xmodem.c Source File</title> href="dox.css" rel="stylesheet" type="text/css"> Generated by Doxygen 1.4.2 --> 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> 1>xmodem.c</h1><a href="xmodem_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 /*! \file xmodem.c \brief XModem Transmit/Receive Implementation with CRC and 1K support. */ //***************************************************************************** // // File Name : 'xmodem.c' // Title : XModem Transmit/Receive Implementation with CRC and 1K support // Author : Pascal Stang - Copyright (C) 2006 // Created : 4/22/2006 // Revised : 7/22/2006 // Version : 0.1 // Target MCU : AVR processors // Editor Tabs : 4 // // This code is distributed under the GNU Public License // which can be found at http://www.gnu.org/licenses/gpl.txt // //***************************************************************************** #include <string.h> #include "<a class="code" href="rprintf_8h.html">rprintf.h</a>" #include "<a class="code" href="timer_8h.html">timer.h</a>" #include "<a class="code" href="xmodem_8h.html">xmodem.h</a>" //#define XMODEM_BUFFER_SIZE 128 #define XMODEM_BUFFER_SIZE 1024 // pointers to stream I/O functions static void (*xmodemOut)(unsigned char c); static int (*xmodemIn)(void); name="l00031"></a><a class="code" href="group__xmodem.html#ga0">00031</a> void <a class="code" href="group__xmodem.html#ga0">xmodemInit</a>(void (*sendbyte_func)(unsigned char c), int (*getbyte_func)(void)) // assign function pointers xmodemOut = sendbyte_func; xmodemIn = getbyte_func; name="l00038"></a><a class="code" href="group__xmodem.html#ga1">00038</a> long <a class="code" href="group__xmodem.html#ga1">xmodemReceive</a>( int (*write)(unsigned char* buffer, int size) ) // create xmodem buffer // 1024b for Xmodem 1K // 128 bytes for Xmodem std. // + 5b header/crc + NULL unsigned char xmbuf[XMODEM_BUFFER_SIZE+6]; unsigned char seqnum=1; // xmodem sequence number starts at 1 unsigned short pktsize=128; // default packet size is 128 bytes unsigned char response='C'; // solicit a connection with CRC enabled char retry=XMODEM_RETRY_LIMIT; unsigned char crcflag=0; unsigned long totalbytes=0; int i,c; while(retry > 0) // solicit a connection/packet xmodemOut(response); // wait for start of packet if( (c = <a class="code" href="group__xmodem.html#ga4">xmodemInTime</a>(XMODEM_TIMEOUT_DELAY)) >= 0) switch(c) case SOH: pktsize = 128; break; #if(XMODEM_BUFFER_SIZE>=1024) case STX: pktsize = 1024; break; #endif case EOT: <a class="code" href="group__xmodem.html#ga5">xmodemInFlush</a>(); xmodemOut(ACK); // completed transmission normally return totalbytes; case CAN: if((c = <a class="code" href="group__xmodem.html#ga4">xmodemInTime</a>(XMODEM_TIMEOUT_DELAY)) == CAN) <a class="code" href="group__xmodem.html#ga5">xmodemInFlush</a>(); xmodemOut(ACK); // transaction cancelled by remote node return XMODEM_ERROR_REMOTECANCEL; default: break; else // timed out, try again // no need to flush because receive buffer is already empty //response = NAK; continue; // check if CRC mode was accepted if(response == 'C') crcflag = 1; // got SOH/STX, add it to processing buffer xmbuf[0] = c; // try to get rest of packet for(i=0; i<(pktsize+crcflag+4-1); i++) if((c = <a class="code" href="group__xmodem.html#ga4">xmodemInTime</a>(XMODEM_TIMEOUT_DELAY)) >= 0) xmbuf[1+i] = c; else // timed out, try again retry--; <a class="code" href="group__xmodem.html#ga5">xmodemInFlush</a>(); response = NAK; break; // packet was too small, retry if(i<(pktsize+crcflag+4-1)) continue; // got whole packet // check validity of packet if( (xmbuf[1] == (unsigned char)(~xmbuf[2])) && // sequence number was transmitted w/o error <a class="code" href="group__xmodem.html#ga3">xmodemCrcCheck</a>(crcflag, &xmbuf[3], pktsize) ) // packet is not corrupt // is this the packet we were waiting for? if(xmbuf[1] == seqnum) // write/deliver data write(&xmbuf[3], pktsize); //spiflashWrite(flashaddr, pktsize, &xmbuf[3]); totalbytes += pktsize; // next sequence number seqnum++; // reset retries retry = XMODEM_RETRY_LIMIT; // reply with ACK response = ACK; continue; else if(xmbuf[1] == (unsigned char)(seqnum-1)) // this is a retransmission of the last packet // ACK and move on response = ACK; continue; else // we are completely out of sync // cancel transmission <a class="code" href="group__xmodem.html#ga5">xmodemInFlush</a>(); xmodemOut(CAN); xmodemOut(CAN); xmodemOut(CAN); return XMODEM_ERROR_OUTOFSYNC; else // packet was corrupt // NAK it and try again <a class="code" href="group__xmodem.html#ga5">xmodemInFlush</a>(); response = NAK; continue; // exceeded retry count <a class="code" href="group__xmodem.html#ga5">xmodemInFlush</a>(); return XMODEM_ERROR_RETRYEXCEED; name="l00178"></a><a class="code" href="group__xmodem.html#ga2">00178</a> long <a class="code" href="group__xmodem.html#ga2">xmodemTransmit</a>( int (*read)(unsigned char* buffer, int size) ) // still to be written return 0; uint16_t crc_xmodem_update(uint16_t crc, uint8_t data) int i; crc = crc ^ ((uint16_t)data << 8); for (i=0; i<8; i++) if(crc & 0x8000) crc = (crc << 1) ^ 0x1021; else crc <<= 1; return crc; name="l00200"></a><a class="code" href="group__xmodem.html#ga3">00200</a> int <a class="code" href="group__xmodem.html#ga3">xmodemCrcCheck</a>(int crcflag, const unsigned char *buffer, int size) // crcflag=0 - do regular checksum // crcflag=1 - do CRC checksum if(crcflag) unsigned short crc=0; unsigned short pktcrc = (buffer[size]<<8)+buffer[size+1]; // do CRC checksum while(size--) crc = crc_xmodem_update(crc, *buffer++); // check checksum against packet if(crc == pktcrc) return 1; else int i; unsigned char cksum = 0; // do regular checksum for(i=0; i<size; ++i) cksum += buffer[i]; // check checksum against packet if(cksum == buffer[size]) return 1; return 0; name="l00234"></a><a class="code" href="group__xmodem.html#ga4">00234</a> int <a class="code" href="group__xmodem.html#ga4">xmodemInTime</a>(unsigned short timeout) int c=-1; while( (timeout--) && ((c=xmodemIn()) < 0) ) <a class="code" href="group__timer.html#ga10">timerPause</a>(1); return c; name="l00244"></a><a class="code" href="group__xmodem.html#ga5">00244</a> void <a class="code" href="group__xmodem.html#ga5">xmodemInFlush</a>(void) while(<a class="code" href="group__xmodem.html#ga4">xmodemInTime</a>(XMODEM_TIMEOUT_DELAY) >= 0); pre></div><hr size="1"><address style="align: right;">Generated on Sun Oct 29 03:41:08 2006 for Procyon AVRlib by  href="http://www.doxygen.org/index.html"> src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </address>

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