drv_xmodem.c

vxWorks上的modem实现

#ifndef __XMODEM_C__
#define __XMODEM_C__

#include "vxWorks.h"
#include "config.h"                 /* board support configuration header */
#include "Typedef.h"
#include "../Bsp.h"
#include "Drv_Crc.h"
#include "Drv_Xmodem.h"


//在主机中加载跑不起来可能是因为命令行把字符收过去了。可以测试一下
_U32 Load_xModemDownLoad ( _U32 startaddr,_U32 *pdwLength)
{
    _U32 iReturn;

    /*====================================================================*/
    /*    Initialize the related variables                                */
    /*====================================================================*/
    g_DecTimer = 0 ;
    iRepeatTime = 0 ;
    ucLastSeqNo = 0 ;
    iDownLoadState = START_OF_HEADER ;
    szDram = (_U8 *)startaddr;
    ulLength = 0 ;
    gucSOHReceived = 0 ;
    iReturn = 0 ;

    InitCrcTable();
    Drv_Print ( "\n\r Please run command \"send file\" of HyperTerminal..." ) ;


    /*====================================================================*/
    /*    FSM execute looply until the state is END                       */
    /*====================================================================*/
    while ( (iDownLoadState != END) && (!iReturn) )
    {
        iReturn = DownLoadFSM[ iDownLoadState ] (  ) ;
        if ( iDownLoadState == END )
        {
            g_DecTimer = 0 ;
            iRepeatTime = 0 ;
            ucLastSeqNo = 0 ;
        }
    }

    if (ulLength == 0)
    {
		return FAILURE;
	}
    *pdwLength = ulLength;

    return iReturn;
}


/*========================================================================*/
/*                                                                        */
/*    Function Name    : StartOfHeader                                    */
/*    Function Func.   : The Function for the state START_OF_HEADER       */
/*    Input Parameter  : none                                             */
/*    Output Parameter : none                                             */
/*    Return           : int                                              */
/*                       0 : success else failure                         */
/*    Call Functions   :                                                  */
/*                       1. InChar  (  )                                  */
/*                       2. OutChar (  )                                  */
/*    Called By        :                                                  */
/*                       1. xModemDownLoad (  )                           */
/*                                                                        */
/*========================================================================*/
_U32 Load_xModemStartOfHeader ( void )
{
    _U8 data ;
    _U32 ret ;
    int i;
    if ( !iRepeatTime )
    {
        /*================================================================*/
        /*    if firstly go the state START_OF_HEADER,                    */
        /*    then send NAK to tell the sender that the receiver have     */
        /*    been ready, and set the timeout timer                       */
        /*================================================================*/
        data = OUTCC ;
        ret  = Drv_DbgSerialOutChar(data);
        g_DecTimer = WAITFORSOH ;
        iRepeatTime ++ ;

        return SUCCESS ;
    }

    /*====================================================================*/
    /* receive the data, if the data is :                                 */
    /*    SOH   ---- indicate the start of Xmodem packet                  */
    /*    EOT   ---- indicate the end of transfer                         */
    /*    CAN   ---- transmiter end the transmition                       */
    /*    other ---- discard                                              */
    /*====================================================================*/
    ret = Drv_DbgSerialInChar(&data);
    if ( !ret )
    {
        switch ( data )
        {
            case SOH :
                gucSOHReceived = 1 ;
                g_DecTimer = 0 ;
                iRepeatTime = 0 ;
                iDownLoadState = SEQUENCE_NO ;
                return SUCCESS ;

            case EOT :
                data = ACK ;
                ret = Drv_DbgSerialOutChar(data);
                g_DecTimer = 0 ;
                iRepeatTime = 0 ;
                iDownLoadState = END ;
                return SUCCESS ;

            case CAN :
                g_DecTimer = 0 ;
                iRepeatTime = 0 ;
                iDownLoadState = END ;
                return FAILURE;

            case 0x03 :    /* 'Ctrl+c' exit to reboot TA */
                g_DecTimer = 0 ;
                iRepeatTime = 0 ;
                iDownLoadState = END ;
                Drv_Print ( "\n\r Download stoped! now rebooting system...");
                for(i=0;i<5000;i++)
                {
                }

                return FAILURE;

            default :
                break ;
        }
    }

    /*====================================================================*/
    /*    If timeout , then retry , if retry time is 10, then error       */
    /*====================================================================*/
    if ( !g_DecTimer )
    {
        if ( (iRepeatTime < MAXREPEATTIME_FOR_FIRST_FRAME)&&(gucSOHReceived == 0) )
        {
            data = OUTCC ;
            ret  = Drv_DbgSerialOutChar(data);

            iRepeatTime ++ ;
            g_DecTimer = WAITFORSOH ;

            return SUCCESS ;
        }
        else
        if( (iRepeatTime < MAXREPEATTIME_FOR_FIRST_FRAME)&&(gucSOHReceived == 1) )
        {
            if( !(iRepeatTime%5) )
            {
	            data = NAK ;
                ret  = Drv_DbgSerialOutChar(data);
	            g_DecTimer = WAITFORSOH ;
            }
            iRepeatTime ++ ;
            return SUCCESS ;
        }
        else
        {
            g_DecTimer = 0 ;
            iRepeatTime = 0 ;

            iDownLoadState = END ;

            return FAILURE;
        }
    }

    return SUCCESS ;
}

/*========================================================================*/
/*                                                                        */
/*    Function Name    : SequenceNo                                       */
/*    Function Func.   : The Function for the state SEQUNCE_NO            */
/*    Created By       : YanJunQing                                       */
/*    Creation Date    : 1997, 1                                          */
/*    Input Parameter  : none                                             */
/*    Output Parameter : none                                             */
/*    Return           : int                                              */
/*                       0 : success else failure                         */
/*    Call Functions   :                                                  */
/*                       1. InChar  (  )                                  */
/*    Called By        :                                                  */
/*                       1. xModemDownLoad (  )                           */
/*                                                                        */
/*========================================================================*/
_U32 Load_xModemSequenceNo ( void )
{
    _U8 data ;
    _U32 ret ;

    /*====================================================================*/
    /*   if firstly go to the state SEQUNCE_NO, then set the timout timer */
    /*====================================================================*/
    if ( !iRepeatTime )
    {
        g_DecTimer = WAITFORDATA ;
        iRepeatTime ++ ;

        return SUCCESS ;
    }

    /*====================================================================*/
    /*    if can receive the data , then go to the state COMP_OF_SEQ_NO   */
    /*====================================================================*/
    ret  = Drv_DbgSerialInChar(&data);
    if ( !ret )
    {
        XModemPacket.ucSeqNo = data ;

        g_DecTimer = 0 ;
        iRepeatTime = 0 ;

        iDownLoadState = COMP_OF_SEQ_NO ;

        return SUCCESS ;
    }

    /*====================================================================*/
    /*    if timeout, then retry,                                         */
    /*    if retry time is 10, then search the SOH again                  */
    /*====================================================================*/
    if ( !g_DecTimer )
    {
        if ( iRepeatTime < MAXREPEATTIME )
        {
            g_DecTimer = WAITFORDATA ;
            iRepeatTime ++ ;

            return SUCCESS ;
        }
        else
        {
            data = NAK ;
            ret  = Drv_DbgSerialOutChar(data);

            g_DecTimer = 0 ;
            iRepeatTime = 0 ;

            iDownLoadState = START_OF_HEADER ;

            return FAILURE;
        }
    }

    return SUCCESS;
}

/*========================================================================*/
/*                                                                        */
/*    Function Name    : CompOfSeqNo                                      */
/*    Function Func.   : The Function for the state COMP_OF_SEQ_NO        */
/*    Input Parameter  : none                                             */
/*    Output Parameter : none                                             */
/*    Return           : int                                              */
/*                       0 : success else failure                         */
/*    Call Functions   :                                                  */
/*                       1. InChar  (  )                                  */
/*                       2. OutChar (  )                                  */
/*                       3. Purge    (  )                                 */
/*    Called By        :                                                  */
/*                       1. xModemDownLoad (  )                           */
/*                                                                        */
/*========================================================================*/
_U32 Load_xModemCompOfSeqNo ( void )
{
    _U8 data ;
    _U32 ret ;

    /*====================================================================*/
    /*    if firstly go to the state COMP_OF_SEQ_NO ,                     */
    /*    then set the timeout timer                                      */
    /*====================================================================*/
    if ( !iRepeatTime )
    {
        g_DecTimer = WAITFORDATA ;
        iRepeatTime ++ ;

        return SUCCESS ;
    }

    /*====================================================================*/
    /*    if receive the correct compensate of sequence no ,              */
    /*    then if the sequence no is :                                    */
    /*         the last sequence no : send ACK , search the SOH again     */
    /*         the expexted sequence no : begin to receive data           */
    /*         other case : send CAN, end the transfer                    */
    /*    else clear the COM ports, search the SOH again                  */
    /*====================================================================*/
    ret = Drv_DbgSerialInChar(&data);
    if ( !ret )
    {
        if ( CompensateTo255( data ) == XModemPacket.ucSeqNo )
        {
            if ( XModemPacket.ucSeqNo == ucLastSeqNo )
            {
                Load_xModemPurge (  ) ;

                data = ACK ;
                ret  = Drv_DbgSerialOutChar(data);

                g_DecTimer = 0 ;
                iRepeatTime = 0 ;

                iDownLoadState = START_OF_HEADER ;

                return SUCCESS ;
            }
            else if ( ( XModemPacket.ucSeqNo == 0 && ucLastSeqNo == MAXSEQNO )