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/*
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* Copyright 2001-2010 Georges Menie (www.menie.org)
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* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the University of California, Berkeley nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* this code needs standard functions memcpy() and memset()
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and input/output functions _inbyte() and _outbyte().
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the prototypes of the input/output functions are:
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int _inbyte(unsigned short timeout); // msec timeout
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void _outbyte(int c);
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*/
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#include "crc16.h"
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#include "boot-loader.h"
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/*
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#define DEBUG_XMODEM
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*/
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#define SOH 0x01
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#define STX 0x02
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#define EOT 0x04
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#define ACK 0x06
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#define NAK 0x15
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#define CAN 0x18
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#define CTRLZ 0x1A
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#define MAXRETRANS 25
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#ifdef DEBUG_XMODEM
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char* dbuf;
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#endif
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static int check(int crc, const unsigned char *buf, int sz)
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{
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if (crc) {
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unsigned short crc = crc16_ccitt(buf, sz);
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unsigned short tcrc = (buf[sz]<<8)+buf[sz+1];
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if (crc == tcrc) {
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#ifdef DEBUG_XMODEM
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dbuf += sprintf(dbuf, "cok1\n");
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#endif
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return 1;
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}
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}
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else {
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int i;
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unsigned char cks = 0;
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for (i = 0; i < sz; ++i) {
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cks += buf[i];
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}
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if (cks == buf[sz]) {
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#ifdef DEBUG_XMODEM
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dbuf += sprintf(dbuf, "cok2\n");
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#endif
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return 1;
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}
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}
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#ifdef DEBUG_XMODEM
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dbuf += sprintf(dbuf, "cer\n");
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#endif
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return 0;
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}
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static void flushinput(void)
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{
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while (_inbyte(DLY_300MS) >= 0) ;
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}
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int xmodemReceive(unsigned char *dest, int destsz)
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{
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unsigned char xbuff[1030]; /* 1024 for XModem 1k + 3 head chars + 2 crc + nul */
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unsigned char *p;
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int bufsz, crc = 0;
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unsigned char trychar = 'C';
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unsigned char packetno = 1;
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int i, c, len = 0;
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int retry, retrans = MAXRETRANS;
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unsigned int wait;
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#ifdef DEBUG_XMODEM
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dbuf = (char *) DEBUG_BUF;
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dbuf += sprintf(dbuf, "XR\n");
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#endif
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for(;;) {
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for( retry = 0; retry < 80; ++retry) {
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if (trychar) _outbyte(trychar);
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if ((c = _inbyte(DLY_1S)) >= 0) {
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switch (c) {
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case SOH:
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bufsz = 128;
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#ifdef DEBUG_XMODEM
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dbuf += sprintf(dbuf, "128\n");
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#endif
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goto start_recv;
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case STX:
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bufsz = 1024;
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#ifdef DEBUG_XMODEM
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dbuf += sprintf(dbuf, "1k\n");
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#endif
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goto start_recv;
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case EOT:
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_outbyte(ACK);
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flushinput();
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#ifdef DEBUG_XMODEM
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dbuf += sprintf(dbuf, "EOT\n");
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#endif
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return len; /* normal end */
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case CAN:
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#ifdef DEBUG_XMODEM
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dbuf += sprintf(dbuf, "CAN\n");
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#endif
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if ((c = _inbyte(DLY_1S)) == CAN) {
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flushinput();
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_outbyte(ACK);
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return -1; /* canceled by remote */
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}
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break;
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default:
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break;
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}
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}
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}
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if (trychar == 'C') { trychar = NAK; continue; }
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flushinput();
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_outbyte(CAN);
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_outbyte(CAN);
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_outbyte(CAN);
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return -2; /* sync error */
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start_recv:
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#ifdef DEBUG_XMODEM
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dbuf += sprintf(dbuf, "sr\n");
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#endif
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if (trychar == 'C') crc = 1;
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trychar = 0;
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p = xbuff;
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*p++ = c;
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for (i = 0; i < (bufsz+(crc?1:0)+3); ++i) {
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if ((c = _inbyte(DLY_1S)) < 0) goto reject;
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*p++ = c;
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}
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if (xbuff[1] == (unsigned char)(~xbuff[2]) &&
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(xbuff[1] == packetno || xbuff[1] == (unsigned char)packetno-1) &&
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check(crc, &xbuff[3], bufsz)) {
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if (xbuff[1] == packetno) {
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register int count = destsz - len;
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if (count > bufsz) count = bufsz;
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if (count > 0) {
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memcpy (&dest[len], &xbuff[3], count);
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len += count;
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}
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++packetno;
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retrans = MAXRETRANS+1;
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}
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if (--retrans <= 0) {
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flushinput();
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_outbyte(CAN);
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_outbyte(CAN);
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_outbyte(CAN);
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#ifdef DEBUG_XMODEM
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dbuf += sprintf(dbuf, "mx e\n");
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#endif
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return -3; /* too many retry error */
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}
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_outbyte(ACK);
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continue;
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}
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else {
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#ifdef DEBUG_XMODEM
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dbuf += sprintf(dbuf, "bad\n");
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#endif
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}
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reject:
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#ifdef DEBUG_XMODEM
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dbuf += sprintf(dbuf, "rj %d\n", c);
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#endif
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flushinput();
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_outbyte(NAK);
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}
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}
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No newline at end of file
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No newline at end of file
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