//
// Hearsay II DTI Modem Driver 15/06/92
// 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;



// 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);
 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,1200,1);
 modemrxrate=rate;
}


// 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,1200,1);
 modemtxrate=rate;
}


// 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);
}


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);
}


// set to 7E1

void setonlinebits(void)
{
 devcon(Device_DataBits,modemport,7,1);
 devcon(Device_ParityBits,modemport,E,1);
 devcon(Device_StopBits,modemport,1,1);
}


// set to user bits

void setuserbits(void)
{
 devcon(Device_DataBits,modemport,modembits,1);
 devcon(Device_ParityBits,modemport,modemparity,1);
 devcon(Device_StopBits,modemport,modemstop,1);
}


// is the modem on line ?

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


void modemcon(void)
{
 string connect;
 int    time;
 int c;

 time=clock()+3000;
 while(clock()<time)
 {
  c=sgetc(0);
  if(c!=-1)
  {
   connect=connect+chars(c);
   tputc(c);
   if((connect/"&NDT")!=-1 || (connect/"&NAT")!=-1 ||
      (connect/"&NCD")!=-1 || (connect/"&DIS")!=-1) break;
  }

  if(modem_online())
  {
   onlinechange(1);
   break;
  }
 }
 setuserbits();
}


void dtimodemprefix(void)
{
 setonlinebits();
 if(modemrxrate==300 && modemtxrate==300)
  sprints("|MV21"+(modemanswer?"C|M":"T|M"));
 else
  sprints("|MV23"+(modemanswer?"C|M":"T|M"));
}


void modem_autoanswer(int rings)
{
 dtimodemprefix();
 sprints("AA|M");

 while(1)
 {
  if(modem_online())
  {
   onlinechange(1);
   break;
  }
 }
 setuserbits();
}


// dial a number and attempt to go on line

void modem_dial(string number)
{
 int i;
 string s;

 while(sreads(s,50,100)) // wait till any pre-dial string has been sent
  tprints(s);
 dtimodemprefix();
 for(i=0; i<slen(number); i++)
 {
  pause(10);
  sprints(mids(number, i, 1));
 }
 sprints("|M");
 modemcon();
}


// reconnect

void modem_reconnect(void)
{
}


// talk to modem

void modem_talk(void)
{
}


// put modem off line

void modem_disconnect(void)
{
 setonlinebits();
 pause(200);
 sprints("|A|A|A|A");
 pause(25);
 setuserbits();
}


// put modem on line

void modem_connect(void)
{
 dtimodemprefix();
 sprints(modemanswer?"C|M":"T|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)
{
 modem_disconnect();
}


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

int modem_initiate(int port)
{
 int code;

 modemport=port;

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

 devcon(Device_Select,modemport,1,0);

 devcon(Device_Channel,modemport,0,0);

 return(0);
}


void main(void)
{


}
