//
// Hearsay II Amstrad SM2400 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;




// 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)
{
 switch(rate)
 {
    case  75:
             modemrxrate=rate;
             modemtxrate=1200;
             modemanswer=1;
             rate=1200;
             break;

   case  300:
   case  600:
   case 1200:
   case 2400:
             if(modemtxrate==75 && rate==1200) modemrxrate=rate;
             else                              modemrxrate=modemtxrate=rate;
             break;

     default:
             return;
 }

 devcon(Device_RxRate,modemport,rate,1);
 devcon(Device_TxRate,modemport,rate,1);
}


// 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)
{
 switch(rate)
 {
    case  75:
             modemtxrate=rate;
             modemrxrate=1200;
             modemanswer=0;
             rate=1200;
             break;


   case  300:
   case  600:
   case 1200:
   case 2400:
             if(modemrxrate==75 && rate=1200) modemtxrate=rate;
             else                             modemtxrate=modemrxrate=rate;
             break;

     default:
             return;
 }

 devcon(Device_RxRate,modemport,rate,1);
 devcon(Device_TxRate,modemport,rate,1);
}


// 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 modemsetspeed(string speed)
{
 int code;

 code=stoi(speed);

 switch(code)
 {
  case 600:
           modem_settxrate(600);
           modem_setrxrate(600);
           break;

 case 1200:
           modem_settxrate(1200);
           modem_setrxrate(1200);
           break;

 case 1275:
           modem_settxrate(75);
           modem_setrxrate(1200);
           break;

 case 2400:
           modem_settxrate(2400);
           modem_setrxrate(2400);
           break;

 case 7512:
           modem_setrxrate(1200);
           modem_settxrate(75);
           break;

   default:
           modem_settxrate(300);
           modem_setrxrate(300);
           break;
 }
}


void modempreamble(void)
{
 sprints("AT");
 if(modemtxrate==75 && modemrxrate==1200) sprints("B23");
 else
 if(modemtxrate==1200 && modemrxrate==75) sprints("B7");
 else
 if(modemtxrate==1200 && modemrxrate==1200)
 {
  if(modemanswer) sprints("B20");
  else            sprints("B0");
 }
 sprints("X2");
}


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)
  {
   modemsetspeed(connect<<8);
   onlinechange(1);
  }
  if(slen(connect)>1)
   break;
 }

 tprints(connect);
}


void modem_autoanswer(int rings)
{
 string connect;
 int    speed;

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

 if(rings)
 {
  while(1)
  {
   if(sreads(connect,6000,100))
   {
    if((connect/"CONNECT")==0)
    {
     modemsetspeed(connect<<8);
     onlinechange(1);
     break;
    }
   }
  }
 }
}


// dial a number and attempt to go on line

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

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

 for(i=0; i<slen(number); i++)
 {
  pause(10);
  sprints(mids(number, i, 1));
 }
 sprints("|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=0;

 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)
{

}

