fax.cpp

在嵌入时系统uc-osii中实现的串口程序

        case 72:                            // 7200 found
             speeds |= FAX_T7200;           // .. set set the speed flag
             break;

        case 96:                            // 9600 found
             speeds |= FAX_T9600;           // .. set set the speed flag
             break;
        }
    }

cp->Write(FAX_RX_SPD);                      // retrieve receive speeds

rc = Get_Line(buf, 5);                      // kill the first CR
rc = Get_Line(buf, 5);                      // get the line from the modem

if (rc)                                     // q. any error?
   return(rc);                              // a. yes.. return w/error

Purge(cp, 1);                               // kill additional characters

c = (*buf == '\n') ? buf+1 : buf;           // select start point

while ((t = strtok(c, ",")) != 0)           // while there are tokens
    {
    c = NULL;                               // continue searching buf

    i = atoi(t);                            // get the token's value

    switch(i)                               // for various values..
        {
        case 24:                            // 2400 found
             speeds |= FAX_R2400;           // .. set set the speed flag
             break;

        case 48:                            // 4800 found
             speeds |= FAX_R4800;           // .. set set the speed flag
             break;

        case 72:                            // 7200 found
             speeds |= FAX_R7200;           // .. set set the speed flag
             break;

        case 96:                            // 9600 found
             speeds |= FAX_R9600;           // .. set set the speed flag
             break;
        }
    }

return(0);                                  // return ok
}



/* ******************************************************************** *
 *
 *  Reset_Modem -- reset modem and communications parameters
 *
 * ******************************************************************** */

void Fax::Reset_Modem(void)

{
int     rc;                                 // return code

cp->Write("\r");                            // send a <CR> to modem
cp->DTR();                                  // lower DTR
Purge(cp, 1);                               // .. kill any receive messages

cp->SetBPS(oldspeed);                       // reset the comm speed
cp->SetLine(oldparms);                      // .. and the comm parms

cp->Write(FAX_RSTMDM);                      // try to reset the modem

switch (rc = wait_for(FAX_OK, FAX_ERR, 2))  // based on response
    {
    case -1:                                // user pressed escape
        return;                             // .. return without message

    case 0:                                 // time out
    case 1:                                 // received OK
    case 2:                                 // received ERROR
        Display_Msg(37+rc);                 // display appropriate message
    }
}



/* ******************************************************************** *
 *
 *  Send_Our_ID -- send our ID to the other station
 *
 *  returns: -2 = User pressed ESC
 *           -1 - Timeout
 *            0 = successful; CONNECT response from modem
 *            1 = NO CARRIER response from modem
 *
 * ******************************************************************** */

int Fax::Send_Our_ID(UCHAR ctl_byte)        // FAX control field

{
int     i, j;                               // work variables
UCHAR  *ch;                                 // work pointer

ch = hmsg.data;                             // get the data address

for (i = 0; i < 20; ch[i++] = 0x04);        // set to 'reversed' blanks

if (station != NULL)                        // q. station ID set?
    {                                       // a. yes ..
    i = strlen(station);                    // get station ID length

    i = i > 20 ? 20 : i;                    // max ID length = 20

    for (j = 0; i--;)                       // for each char in station ID
        {
        if (strchr("0123456789+ ",          // q. valid ID character?
                       station[i]) != 0)
            ch[j++] =                       // a. yes.. reverse & copy it
                   Reverse_Byte(station[i]);
        }
    }

return(Send_Hmsg(NON_FINAL, ctl_byte, 20)); // send the HDLC message
}




/* ******************************************************************** *
 *
 *  Display_ID -- display remote station ID
 *
 * ******************************************************************** */

void Fax::Display_ID(char *pf,              // prefix
                    UCHAR *id)              // id string

{
char    cw[21];                             // work area

int     i, j;                               // work variables

for (i = 20; i--;)                          // backscan the ID
    if (id[i] != ' ')                       // q. blank?
        break;                              // a. no .. get out now

if (i++ == -1)                              // q. ID found?
   return;                                  // a. no .. leave now


for (j = 0; i--; cw[j++] = id[i]);          // copy the ID in reverse
cw[j] = 0;                                  // .. and end the string

sprintf(fs.f_msg, "%s %s\r\n", pf, cw);     // put message in buffer
(stat)(1, &fs);                             // .. and display it
}




/* ******************************************************************** *
 *
 *  Rcv_Hmsg -- receive an HDLC frame
 *
 *  returns: -2 = User pressed ESC
 *           -1 - Timeout
 *            0 = successfully received
 *            1 = NO CARRIER or error
 *
 * ******************************************************************** */

int Fax::Rcv_Hmsg(void)

{
int     rc,                                 // return code
        loop = 1,                           // loop until finished
        dleflag = FALSE;                    // dle not seen yet

char    *nxtchar,                           // next receive address
        wc;                                 // work for char reads

long    timer;                              // workspace for timer

hmsg.len = 0;                               // initialize length
nxtchar = (char *) cmsg;                    // .. and next receive pointer

if ((rc = HDLC_Mode(RECEIVE)) != 0)         // q. connect ok?
   return(rc);                              // a. no .. leave w/error

timer = SECS(5);                            // start 5 second timer

while(loop)                                 // enter a loop ..
    switch(cp->Read(nxtchar, &wc, &wc))     // attempting to read bytes
        {
        case -1:                            // no character available
            if (TimeOut(&timer))            // q. timeout?
                return(-1);                 // a. yes.. tell the caller

            if ((stat)(0, &fs))             // q. user press escape?
                return(-2);                 // a. yes.. tell the caller

            continue;                       // else .. continue loop

        case 0:                             // character received
            hmsg.len++;                     // increment received count

            if (dleflag)                    // q. previous char DLE?
               {                            // a. yes ..
               dleflag = FALSE;             // .. reset the flag

               if (*nxtchar == ETX)         // q. DLE ETX sequence?
                   loop = 0;                // a. yes .. exit the loop
               }

            else if (*nxtchar == DLE)       // q. char a DLE?
               dleflag = TRUE;              // a. yes .. show true

            nxtchar++;                      // point at next character
            break;                          // end this case

        default:                            // lost characters
            return(1);                      // .. show receive unsuccessful
        }

rc = wait_for(FAX_OK, FAX_ERR, 5) - 1;      // OK should follow message

Reverse_Bytes(cmsg, hmsg.len - 2);          // reverse the bits

return(rc);                                 // return to caller

}




/* ******************************************************************** *
 *
 *  Send_Hmsg -- send an HDLC frame
 *
 *  returns: -2 = User pressed ESC
 *           -1 - Timeout
 *            0 = successful; CONNECT response from modem
 *            1 = NO CARRIER response from modem
 *
 * ******************************************************************** */

int Fax::Send_Hmsg(UCHAR finalflg,          // final flag
                   UCHAR ctl_byte,          // fax control field
                   int   len)               // length of data bytes

{
int     rc;                                 // return code

hmsg.addr        = FAX_ADDR;                // set the address field
hmsg.ctl_fld     = FAX_CTL | finalflg;      // .. and the control field
hmsg.fax_ctl_fld = ctl_byte;                // .. and fax control field
hmsg.data[len]   = DLE;                     // .. add DLE
hmsg.data[len+1] = ETX;                     // .. and ETX

Reverse_Bytes(cmsg, len+3);                 // reverse the bits

if (NOT connected)                          // q. connected already?
   {                                        // a. no .. connect now
   rc = HDLC_Mode(TRANSMIT);                // attempt the connection

   if (rc)                                  // q. connect ok?
      return(rc);                           // a. no .. leave w/error

   connected = TRUE;                        // else .. show connected.
   }

cp->Write((char *) cmsg, len+5);            // send to remote

if (finalflg)                               // q. final flag on?
   {                                        // a. yes ..
   rc = wait_for(FAX_OK, FAX_ERR, 5) - 1;   // .. wait for OK
   connected = FALSE;                       // .. and we're not connected
   }

 else
   rc = wait_for(FAX_CONN,                  // else .. wait for CONNECT
                 FAX_NO_CARR, 60) - 1;      // .. or NO CARRIER


return(rc);                                 // return to caller

}




/* ******************************************************************** *
 *
 *  Send_CSI -- Send the called subscriber ID signal to caller
 *
 *  returns: -2 = User pressed ESC
 *           -1 - Timeout
 *            0 = successful; CONNECT response from modem
 *            1 = NO CARRIER response from modem
 *
 * ******************************************************************** */

int Fax::Send_CSI(void)

{

return(Send_Our_ID(FAX_FCF_CSI));           // send CSI frame to caller

}



/* ******************************************************************** *
 *
 *  Send_TSI -- Send the transmitting subscriber ID signal
 *
 *  returns: -2 = User pressed ESC
 *           -1 - Timeout
 *            0 = successful
 *            1 = unsuccessful
 *
 * ******************************************************************** */

int Fax::Send_TSI(void)