From b52e794997b349d629b7c3477bab6d4000436387 Mon Sep 17 00:00:00 2001 From: Jeff Parsons Date: Thu, 18 Aug 2016 18:49:01 -0700 Subject: [PATCH] Added a (temporary) auto-XON hack to the VT100's SerialPort component to prevent ugly buffer overflows when a PC is shoveling the data in too fast (to be replaced later with real flow-control interfaces) --- modules/pc8080/lib/serialport.js | 24 ++++- versions/pc8080/1.24.0/pc8080-dbg.js | 140 +++++++++++++-------------- versions/pc8080/1.24.0/pc8080.js | 112 ++++++++++----------- 3 files changed, 149 insertions(+), 127 deletions(-) diff --git a/modules/pc8080/lib/serialport.js b/modules/pc8080/lib/serialport.js index b064af918..2a986fc99 100644 --- a/modules/pc8080/lib/serialport.js +++ b/modules/pc8080/lib/serialport.js @@ -103,6 +103,17 @@ function SerialPort8080(parmsSerial) { this.charBOL = parmsSerial['charBOL']; this.iLogicalCol = 0; + /* + * fAutoXOFF enables some experimental auto-XOFF/XON processing. It assumes if the VT100 firmware + * issues an XOFF, receiveByte() should stop accepting more data until the firmware issues an XOFF. + * + * The downside is that this doesn't really do anything to stem the flow of incoming data; it just + * prevents the VT100's internal buffer from overflowing. TODO: Eliminate the need for this hack + * and add some *real* flow-control interfaces between connected SerialPort components. + */ + this.fAutoXOFF = true; + this.fAutoStop = false; + Component.call(this, "SerialPort", parmsSerial, SerialPort8080, Messages8080.SERIAL); var sBinding = parmsSerial['binding']; @@ -592,7 +603,7 @@ SerialPort8080.prototype.getBaudTimeout = function(maskRate) SerialPort8080.prototype.receiveByte = function(b) { this.printMessage("receiveByte(" + str.toHexByte(b) + "), status=" + str.toHexByte(this.bStatus)); - if (!(this.bStatus & SerialPort8080.UART8251.STATUS.RECV_FULL)) { + if (!this.fAutoStop && !(this.bStatus & SerialPort8080.UART8251.STATUS.RECV_FULL)) { this.bDataIn = b; this.bStatus |= SerialPort8080.UART8251.STATUS.RECV_FULL; this.cpu.requestINTR(this.nIRQ); @@ -645,6 +656,17 @@ SerialPort8080.prototype.transmitByte = function(b) this.printMessage("transmitByte(" + str.toHexByte(b) + ")"); + if (this.fAutoXOFF) { + if (b == 0x13) { // XOFF + 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e;if(e=c&&a.ua&&a.S){e=a.w;for(var f=a.S,h=!0,g=a.ta>>>e.pa;0>8|(r&255)<<8);k>C&v;ke(a,a.Hc,k++,l,X);C+=x}k>p&&(p=k);l=e&&(e=l+1)}f+=2;g++;if(k>=a.L&&(k=0,l++,l>a.ca))break}a.ua=!0;cMissing <canvas> support. 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