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Added SerialPort interface to support the passing of flow control signals between machines (only PDP-11 and VT100 for now; PCx86 will come later, after I study how well, or not-so-well, this works with the VT100)

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Jeff Parsons 2016-12-01 11:15:27 -08:00 • committed by Jeff Parsons
commit 6bea7fd0e9
11 changed files with 901 additions and 732 deletions
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63
modules/pdp11/lib/serialport.js
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@ -80,6 +80,7 @@ function SerialPortPDP11(parmsSerial) {
this.nBaudReceive = parmsSerial['baudReceive'] || PDP11.DL11.RCSR.BAUD;
this.nBaudTransmit = parmsSerial['baudTransmit'] || PDP11.DL11.XCSR.BAUD;
this.fUpperCase = parmsSerial['upperCase'];
this.fNullModem = true;
/**
* consoleOutput becomes a string that records serial port output if the 'binding' property is set to the
@ -134,14 +135,15 @@ function SerialPortPDP11(parmsSerial) {
* No connection until initConnection() is called.
*/
this.sDataReceived = "";
this.connection = this.sendData = null;
this.connection = this.sendData = this.updateStatus = null;
/*
* Export all functions required by initConnection(); currently, this is the bare minimum (no flow control yet).
* Export all functions required by initConnection().
*/
this['exports'] = {
'connect': this.initConnection,
'receiveData': this.receiveData
'receiveData': this.receiveData,
'receiveStatus': this.receiveStatus
};
}
@ -308,7 +310,7 @@ SerialPortPDP11.prototype.initBus = function(cmp, bus, cpu, dbg)
var serial = this;
this.irqReceiver = this.cpu.addIRQ(PDP11.DL11.RVEC, PDP11.DL11.PRI, MessagesPDP11.DL11);
this.irqReceiver = this.cpu.addIRQ(this.iAdapter? -1 : PDP11.DL11.RVEC, PDP11.DL11.PRI, MessagesPDP11.DL11);
this.timerReceiveInterrupt = this.cpu.addTimer(function readyReceiver() {
var b = serial.receiveByte();
@ -325,7 +327,7 @@ SerialPortPDP11.prototype.initBus = function(cmp, bus, cpu, dbg)
}
});
this.irqTransmitter = this.cpu.addIRQ(PDP11.DL11.XVEC, PDP11.DL11.PRI, MessagesPDP11.DL11);
this.irqTransmitter = this.cpu.addIRQ(this.iAdapter? -1 : PDP11.DL11.XVEC, PDP11.DL11.PRI, MessagesPDP11.DL11);
this.timerTransmitInterrupt = this.cpu.addTimer(function readyTransmitter() {
serial.regXCSR |= PDP11.DL11.XCSR.READY;
@ -334,7 +336,7 @@ SerialPortPDP11.prototype.initBus = function(cmp, bus, cpu, dbg)
}
});
bus.addIOTable(this, SerialPortPDP11.UNIBUS_IOTABLE);
bus.addIOTable(this, SerialPortPDP11.UNIBUS_IOTABLE, this.iAdapter? ((PDP11.UNIBUS.DL11 + (this.iAdapter - 1) * 8) - PDP11.UNIBUS.RCSR) : 0);
bus.addResetHandler(this.reset.bind(this));
this.setReady();
@ -349,6 +351,7 @@ SerialPortPDP11.prototype.initBus = function(cmp, bus, cpu, dbg)
* If the target component is found, then verify that it has exported functions with the following names:
*
* receiveData(data): called when we have data to transmit; aliased internally to sendData(data)
* receiveStatus(pins): called when our control signals have changed; aliased internally to updateStatus(pins)
*
* For now, we're not going to worry about communication in the other direction, because when the target component
* performs its own initConnection(), it will find our receiveData() function, at which point communication in both
@ -377,6 +380,7 @@ SerialPortPDP11.prototype.initConnection = function()
var fnConnect = exports['connect'];
if (fnConnect) fnConnect.call(this.connection);
this.sendData = exports['receiveData'];
this.updateStatus = exports['receiveStatus'];
if (this.sendData) {
this.status(this.idMachine + '.' + sSourceID + " connected to " + sTargetID);
return;
@ -483,7 +487,7 @@ SerialPortPDP11.prototype.restore = function(data)
SerialPortPDP11.prototype.initState = function(data)
{
this.regRBUF = 0;
this.regRCSR = 0;
this.regRCSR = PDP11.DL11.RCSR.CTS; // TODO: I didn't use to set this initially; is this wise?
this.regXCSR = PDP11.DL11.XCSR.READY;
this.abReceive = [];
return true;
@ -592,6 +596,30 @@ SerialPortPDP11.prototype.receiveByte = function()
return b;
};
/**
* receiveStatus(pins)
*
* @this {SerialPortPDP11}
* @param {number} pins
*/
SerialPortPDP11.prototype.receiveStatus = function(pins)
{
var oldRCSR = this.regRCSR;
this.regRCSR &= ~(PDP11.DL11.RCSR.CTS | PDP11.DL11.RCSR.CD);
if (pins & RS232.CTS.MASK) {
this.regRCSR |= PDP11.DL11.RCSR.CTS;
}
if (pins & RS232.CD.MASK) {
this.regRCSR |= PDP11.DL11.RCSR.CD;
}
if (oldRCSR != this.regRCSR) {
this.regRCSR |= PDP11.DL11.RCSR.DSC;
if (this.regRCSR & PDP11.DL11.RCSR.DIE) {
this.cpu.setIRQ(this.irqReceiver);
}
}
};
/**
* transmitByte(b)
*
@ -681,7 +709,9 @@ SerialPortPDP11.prototype.transmitByte = function(b)
*/
SerialPortPDP11.prototype.readRCSR = function(addr)
{
return this.regRCSR & PDP11.DL11.RCSR.RMASK;
var data = this.regRCSR & PDP11.DL11.RCSR.RMASK;
this.regRCSR &= ~PDP11.DL11.RCSR.DSC;
return data;
};
/**
@ -693,6 +723,23 @@ SerialPortPDP11.prototype.readRCSR = function(addr)
*/
SerialPortPDP11.prototype.writeRCSR = function(data, addr)
{
/*
* Whenever DTR or RTS changes, we also want to notify any connected machine, via updateStatus().
*/
if (this.updateStatus) {
var delta = (data ^ this.regRCSR);
if (delta & PDP11.DL11.RCSR.RS232) {
var pins = 0;
if (this.fNullModem) {
pins |= (data & PDP11.DL11.RCSR.RTS)? RS232.CTS.MASK : 0;
pins |= (data & PDP11.DL11.RCSR.DTR)? (RS232.DSR.MASK | RS232.CD.MASK): 0;
} else {
pins |= (data & PDP11.DL11.RCSR.RTS)? RS232.RTS.MASK : 0;
pins |= (data & PDP11.DL11.RCSR.DTR)? RS232.DTR.MASK : 0;
}
this.updateStatus(pins);
}
}
this.regRCSR = (this.regRCSR & ~PDP11.DL11.RCSR.WMASK) | (data & PDP11.DL11.RCSR.WMASK);
};