drv_xmodem.h

vxWorks上的modem实现

#ifndef __XMODEM_H__
#define __XMODEM_H__

#ifdef  __XMODEM_C__

_U32  Load_xModemDownLoad ( _U32 startaddr,_U32 *pdwLength);
_U32  Load_xModemStartOfHeader  ( void ) ;
_U32  Load_xModemSequenceNo     ( void ) ;
_U32  Load_xModemCompOfSeqNo    ( void ) ;
_U32  Load_xModemData           ( void ) ;
_U32  Load_xModemCRC            ( void ) ;
_U32  Load_xModemEnd            ( void ) ;
void Load_xModemPurge          ( void ) ;

#if 0
_U16 CalCRC ( _U8 * , _U32 ) ;
void make_crc ( _U8 *buffer, _U32 count, _U16 *crc ) ;
void Purge ( void ) ;
void init_crc_tab ( void ) ;
#endif

#define  BIG_ENDIAN 1

/*========================================================================*/
/*                      const for Xmodem protocol.                        */
/*========================================================================*/
#define MAXREPEATTIME_FOR_FIRST_FRAME 500
#define MAXREPEATTIME  10      /* when appear error, retry times          */

#define WAITFORSOH     50      /* the time waitting for SOH               */
#define WAITFORDATA    100      /* the time waiting for data in the packet */

#define MAXDATANO     128      /* the maximize no. of data in the packet  */
#define MAXCRCNO        2      /* the maximize no. of CRC in the packet   */
#define MAXSEQNO      255

enum DownLoadState           /* enum the state of FSM for Xmodem protocol */
{
    START_OF_HEADER ,
    SEQUENCE_NO ,
    COMP_OF_SEQ_NO ,
    DATA ,
    C_R_C ,
    END
} ;

enum CNTLCHAR                /* enum the control character used in Xmodem */
{
    SOH   = 0x01 ,
    EOT   = 0x04 ,
    ACK   = 0x06 ,
    DLE   = 0x10 ,
    X_ON  = 0x11 ,
    X_OFF = 0x13 ,
    NAK   = 0x15 ,
    SYN   = 0x16 ,
    CAN   = 0x18 ,
    OUTCC     = 0x43
} ;

/* calculate the compensate for packet sequence no. */
#define CompensateTo255(ucSeqNo)  (_U8)(255 - ucSeqNo)

struct XMODEMPacket                    /* struct for Xmodem packet        */
{
    _U8 ucSOH ;              /* Start of Header                 */
    _U8 ucSeqNo ;            /* Sequence No.                    */
    _U8 ucCmpOfSeqNo ;       /* Compensate of Sequence No.      */
    _U8 ucData[ MAXDATANO ] ;/* Data                            */
    _U8 ucCRC[ MAXCRCNO ] ;  /* CRC                             */
} ;

struct XMODEMPacket XModemPacket ;        /* Xmodem packet                */

_U32 (*( DownLoadFSM[ 6 ] ))( void ) =      /* FSM of Xmodem protocol      */
{
    Load_xModemStartOfHeader ,
    Load_xModemSequenceNo ,
    Load_xModemCompOfSeqNo ,
    Load_xModemData ,
    Load_xModemCRC ,
    Load_xModemEnd
} ;

int iDownLoadState ;                       /* the State of FSM            */
int iRepeatTime ;                          /* retry times                 */
int iCurrentData ;                         /* have received data no.      */
int iCurrentCRC ;                          /* have received CRC no.       */
_U8 ucLastSeqNo ;                /* the last sequence no.       */
extern volatile _U32 g_DecTimer ;         /* the Timer                   */
_U8 gucSOHReceived ;

_U8 * szDram ;                            /* the start address of dram   */
_U32 ulLength ;                   /* the length of download file */
_U8 * szFlash ;                           /* the start address of flash  */
/*
 * CRC-CCITT 16 is based on the polynomial x^16+x^12+x^5+1,
 * and the reference value is 0x1021
 */
// #define CRC16_POLY      0x1021
 /* Function init_crc_tab() will initialize it */
// _U16  crc_tab[256];

#endif
#endif