/*------------------------------------------------------------------------- * Filename:      xmodem.c * Version:       $Id: xmodem.c,v 1.2 2002/01/06 19:02:29 erikm Exp $ * Copyright:     Copyright (C) 2001, Hewlett-Packard Company * Author:        Christopher Hoover <ch@hpl.hp.com> * Description:   xmodem functionality for uploading of kernels  *                and the like * Created at:    Thu Dec 20 01:58:08 PST 2001 *-----------------------------------------------------------------------*//* * xmodem.c: xmodem functionality for uploading of kernels and  *            the like * * Copyright (C) 2001 Hewlett-Packard Laboratories * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA * */#ident "$Id: xmodem.c,v 1.2 2002/01/06 19:02:29 erikm Exp $"//#ifdef HAVE_CONFIG_H//# include <blob/config.h>//#endif//#include <blob/errno.h>//#include <blob/serial.h>//#include <blob/util.h>#include <../inc/board.h>#define	UART_RD_TMOUT	300000#define TIMEOUT 	800#define MAXERRORS	10//5#define	serial_write_raw(cc)	putch(cc)static int SerialInputBlock(char *buf, unsigned long count, unsigned long timeout){/*	unsigned long i;		do {		i = 0;		while(!SerialRxToBuf(buf) && (i++ < UART_RD_TMOUT));		if(i < UART_RD_TMOUT)			return 1;			//只讀一個字符	} while(--timeout);	return -1;*/		if(!WaitEventWithTimeout(kbhit, 1, timeout)) {		*buf = getch();		return 1;	}	return 0;}//#include "ser2.c"#define SOH 0x01#define STX 0x02#define EOT 0x04#define ACK 0x06#define NAK 0x15#define CAN 0x18#define BS  0x08/*Cf:  http://www.textfiles.com/apple/xmodem  http://www.phys.washington.edu/~belonis/xmodem/docxmodem.txt  http://www.phys.washington.edu/~belonis/xmodem/docymodem.txt  http://www.phys.washington.edu/~belonis/xmodem/modmprot.col*/#undef	ERROR#define ERROR(...) do { } while (0)//#define	ERROR	Uart_Printf//static char blockBuf[1024];static char *blockBuf;			//使用指針,去掉copy過程static __inline void WriteByte(char cc) { 	serial_write_raw(cc); }int ReadByteWithTimeout(unsigned int timeout) {	char buf[1];	int n;	n = SerialInputBlock(buf, 1, timeout);	if (n == 1)		return buf[0] & 0xff;	else		return -1;}static void ReadFlush() {	while(ReadByteWithTimeout(1000)>=0);}  int XModemReceive(char *bufBase, int bufLen){	unsigned int errors = 0;	unsigned int wantBlockNo = 1;	unsigned int length = 0;	int crc = 1;		//use crc by send 'C', use checksum by send NAK	char nak = 'C';	int crc_val;	unsigned char expectedCksum;				blockBuf = bufBase;		//將bufBase賦與blockBuf;	ERROR("start xmodem!\n");		ReadFlush();		/* Ask for CRC; if we get errors, we will go with checksum */	WriteByte(nak);	ERROR("WriteByte(nak)\n");	for (;;) {		int blockBegin;		int blockNo, blockNoOnesCompl;		int blockLength;		int cksum = 0;		int crcHi = 0;		int crcLo = 0;		blockBegin = ReadByteWithTimeout(TIMEOUT);		if (blockBegin < 0){			ERROR("Read blockBegin timeout!\n");			goto timeout;		}		nak = NAK;		switch (blockBegin) {		case SOH:		case STX:			break;		case EOT:			WriteByte(ACK);			ERROR("WriteByte(ACK): done\n");			goto done;		default:			ERROR("blockBegin error!\n");			errors--;			goto error;		}		/* block no */		blockNo = ReadByteWithTimeout(TIMEOUT);		if (blockNo < 0){			ERROR("blockNo timeout!\n");			goto timeout;		}		/* block no one's compliment */		blockNoOnesCompl = ReadByteWithTimeout(TIMEOUT);		if (blockNoOnesCompl < 0){			ERROR("blockNoOnesCompl timeout!\n");			goto timeout;		}		if (blockNo != (255 - blockNoOnesCompl)) {			ERROR("bad block ones compl\n");			goto error;		}		blockLength = (blockBegin == SOH) ? 128 : 1024;		{			int i, j;						crc_val = 0;						expectedCksum = 0;			for (i = 0; i < blockLength; i++) {				int cc = ReadByteWithTimeout(TIMEOUT);				if (cc < 0){					ERROR(" read block byte timeout!\n");					goto timeout;				}				blockBuf[i] = cc;						//crc 或 checksum 計算加在讀數(shù)據(jù)后				if (crc) {					crc_val = crc_val ^ cc << 8;					for (j = 0; j < 8; j++)						if (crc_val & 0x8000)							crc_val = crc_val << 1 ^ 0x1021;						else							crc_val = crc_val << 1;				} else {					expectedCksum += cc;				}			}		}		if (crc) {			crcHi = ReadByteWithTimeout(TIMEOUT);			if (crcHi < 0) {				ERROR(" read crcHi timeout!\n");				goto timeout;			}			crcLo = ReadByteWithTimeout(TIMEOUT);			if (crcLo < 0) {				ERROR(" read crcLo timeout!\n");				goto timeout;			}									if ((crcHi != ((crc_val>>8) & 0xff)) ||			    (crcLo != (crc_val & 0xff))) {				ERROR("crc error!\n");				goto error;			}					} else {			cksum = ReadByteWithTimeout(TIMEOUT);			if (cksum < 0){				ERROR(" read chksum timeout!\n");				goto timeout;			}						if (cksum != expectedCksum) {				ERROR("checksum error! \n");				goto error;			}		}		if (blockNo == ((wantBlockNo - 1) & 0xff)) {			/* a repeat of the last block is ok, just ignore it. */			/* this also ignores the initial block 0 which is */			/* meta data. */			goto next;		} else if (blockNo != (wantBlockNo & 0xff)) {			ERROR("unexpected block no! \n");			goto error;		}		wantBlockNo++;		length += blockLength;		if (length > bufLen) {			ERROR("out of space\n");			goto error;		}/*		{			int i;			for (i = 0; i < blockLength; i++)				*bufBase++ = blockBuf[i];		}*/				blockBuf += blockLength;	//接收成功,指針加上收到字節(jié)數(shù)next:		errors = 0;		WriteByte(ACK);		ERROR("Receive one block OK!\n");		continue;error:timeout:		ERROR("Timeout.\n");		errors++;		if (errors == MAXERRORS) {			/* Abort */			int i;			// if using crc, try again w/o crc			if (nak == 'C') {				nak = NAK;				errors = 0;				crc = 0;		//use checksum				goto timeout;			}						for (i = 0; i < 5; i ++)				WriteByte(CAN);			for (i = 0; i < 5; i ++)				WriteByte(BS);			puts("too many errors; giving up\n");			return -1;		}		ReadFlush();		WriteByte(nak);		ERROR("WriteByte(nak)\n");	}done:	ERROR("\nxmodem done.\n");	ReadFlush();	return length;}