//
// Hearsay II Linnet Quad Modem Driver 28/08/92
// Copyright  RISC Developments Limited 1992
//

int modemrxrate;
int modemtxrate;
int modembits;
int modemstop;
int modemparity;
int modemport;
int modemflow;
int modemlink;
int modemanswer;
int modemtonedial;




int modemechoedcommand(string & s,int ok)
{
 int    n;
 string t;

 for(n=0;n<5;n++)
 {
  sprints(s);
  sprints("|M");
  while(1)
  {
   if(!sreadtext(t,100,100)) break;

   if(s==t)
   {
    if(ok)
    {
     while(1)
     {
      if(!sreadtext(t,100,100)) break;
      if(t=="OK") return(0);
     }
    }
    else return(0);
    break;
   }
  }
 }
 return(1);
}


// count or purge buffer

int modem_countpurge(int rxtx,int code)
{
 return(devcon(Device_CountPurge,modemport,rxtx,code));
}


// generate break for time cs

void modem_break(int time)
{
 devcon(Device_Break,modemport,time,0);
}


// tell modem to use a given sort of flow control

void modem_setflow(int flow)
{
 devcon(Device_Flow,modemport,flow,1);
 modemflow=flow;
}


// read flow control in use

int modem_readflow(void)
{
 modemflow=devcon(Device_Flow,modemport,0,0);
 return(modemflow);
}


// tell modem to use a given sort of link level protocol

int modem_link(int link)
{
 modemlink=internal_link(link);
 if(modemlink==2) internal_link(0);
 return(modemlink);
}


// read rx baud rate at which modem is talking to outside world

int modem_readrxrate(void)
{
 return(modemrxrate);
}


// set rx rate

void modem_setrxrate(int rate)
{
 devcon(Device_RxRate,modemport,rate,1);
 modemrxrate=devcon(Device_RxRate,modemport,0,0);
}


// read tx baud rate at which modem is talking to outside world

int modem_readtxrate(void)
{
 return(modemtxrate);
}


// set tx rate

void modem_settxrate(int rate)
{
 devcon(Device_TxRate,modemport,rate,1);
 modemtxrate=devcon(Device_TxRate,modemport,0,0);
}


// read number of data bits

int modem_readbits(void)
{
 return(modembits);
}


// set number of data bits

void modem_setbits(int bits)
{
 devcon(Device_DataBits,modemport,bits,1);

 modembits=devcon(Device_DataBits,modemport,0,0);
 modemparity=devcon(Device_ParityBits,modemport,0,0);
 modemstop=devcon(Device_StopBits,modemport,0,0);
}


// read parity bits

int modem_readparity(void)
{
 return(modemparity);
}


// set parity bits

void modem_setparity(int parity)
{
 devcon(Device_ParityBits,modemport,parity,1);

 modembits=devcon(Device_DataBits,modemport,0,0);
 modemparity=devcon(Device_ParityBits,modemport,0,0);
 modemstop=devcon(Device_StopBits,modemport,0,0);
}


// read stop bits

int modem_readstop(void)
{
 return(modemstop);
}


// set stop bits

void modem_setstop(int stop)
{
 devcon(Device_StopBits,modemport,stop,1);

 modembits=devcon(Device_DataBits,modemport,0,0);
 modemparity=devcon(Device_ParityBits,modemport,0,0);
 modemstop=devcon(Device_StopBits,modemport,0,0);
}


// read answer/originate mode

int modem_readanswer(void)
{
 return(modemanswer);
}


// set answer/originate mode

void modem_setanswer(int answer)
{
 modemanswer=answer;
}


// set to tone/pulse dial

int modem_tonedial(int tonedial)
{
 modemtonedial=tonedial;
 return(modemtonedial);
}


// is the modem on line ?

int modem_online(void)
{
 return(devcon(Device_Status,modemport,0,-1) & SERIAL_DCD);
}



void modemcon(void)
{
 string connect;
                             
 sreads(connect,6000,100);        // read echo'd command 
 tprints(connect);

 while(sreads(connect,6000,100))    // look for connect message
 {
  if((connect/"CONNECT")==0)
   onlinechange(1);
  if(slen(connect)>1)
   break;
 }
 tprints(connect);
}


void modempreamble(void)
{
 sprints("AT");
 if(modemlink==2) sprints("\\P1");
 else             sprints("\\P0");
}


void modem_autoanswer(int rings)
{
 string connect;

 modempreamble();
 sprints("S0="+itos(rings)+"|M");

 if(rings)
 {
  while(1)
  {
   if(sreads(connect,6000,100))
   {
    if((connect/"CONNECT")==0)
    {
     onlinechange(1);
     break;
    }
   }
  }
 }
}


// dial a number and attempt to go on line

void modem_dial(string number)
{
 string s;

 while(sreads(s,50,100)) // wait till any pre-dial string has been sent
  tprints(s);
 modempreamble();
 sprints((modemtonedial?"DT":"DP")+number+"|M");
 modemcon();
}


// reconnect

void modem_reconnect(void)
{
 sprints("ATO|M");
}


// talk to modem

void modem_talk(void)
{
 pause(100);
 sprints("+++");
 pause(100);
}


// put modem off line

void modem_disconnect(void)
{
 pause(100);
 sprints("+++");
 pause(200);
 sprints("ATH0|M");
}


// put modem on line

void modem_connect(void)
{
 modempreamble();
 sprints(modemanswer?"A|M":"D|M");
 modemcon();
}


// called when Hearsay is about to terminate
// good time to hang up line etc.

void modem_terminate(void)
{
 devcon(Device_Select,modemport,0,0);
}



// cancel modem operation

void modem_interrupt(void)
{
 sprints("|M"); 
}


// called when driver is installed
// will be followed by call to set baud rates/bits

/* return 0 if succesful */

int modem_initiate(int port)
{
 modemport=port;

 if(!devcon(Device_Claim,modemport,0,0)) return(2);

 devcon(Device_Select,modemport,1,0);

 devcon(Device_Channel,modemport,0,0);

 devcon(Device_RxRate,modemport,2400,1);
 devcon(Device_TxRate,modemport,2400,1);

 modem_setbits(8);
 modem_setparity(0);
 modem_setstop(1);

 setpoll(0);

 sprints("ATQ0V1S0=0|M");
 pause(50);

 setpoll(1);

 return(0);
}


void main(void)
{


}
