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Parallel Port IRQ
Figure 19.3 The original PC s parallel port was implemented using standard TTL chips.
PARALLEL PORT
register is used to enable the data output latch drivers and enable interrupt requests from the parallel port hardware. In this gure I have assumed that the parallel port is a 25-pin DB-25 male connector. The true Centronics printer connector is a 36-pin shell, but this shell is connected to the PC s DB-25M parallel port connector via a female connector and several feet of cable. When developing hardware that interfaces to the PC, I normally use straightthrough DB-25M to DB-25F (female) cable or a printer extension cable that is a DB25F to DB-25F. The straight through cable normally is used as straight-through serial cables and extensions to the Centronics connector cables. The printer extension cable is used for connecting PCs up to a selector box for inexpensively sharing PCs. The advantage of using these types of cables is that the output can be brought from your PC to your bench and not be translated in any way. This is an advantage in applications where the hardware interface will be connected directly to the parallel port on the PC. If you look at the PC/AT Technical Reference manual, you will see that the parallel port is designed with 74LS TTL logic that is capable of driving 20-mA or more loads. This was later changed to provide the data pins with pulled-up open-collector outputs, which is the standard assumed by most bidirectional ports built into the SuperIO chips built into modern PCs. This means that you can only assume that the parallel port, at best, will only be able to source a couple of milliamps or so. When the parallel port passes data to a printer, the I/O pins create the basic waveform shown in Fig. 19.4, with 0.5- s minimum delays between the edges of the waveforms. It is important to note that the printer BIOS routines will not send a new character to the printer until it is no longer busy. When Busy is no longer active, the Ack line is pulsed active, which can be used to request an interrupt to indicate to data output code that the printer is ready to accept another character. When interfacing to the parallel port, because the different port pins are seemingly inverted at random, I use a set of functions that I created a number of years ago to eliminate the confusion. These routines change all the input and output lines to being positively active (to simplify trying to gure out what is happening).
Data _Strobe _Busy _Ack Poll for Busy Complete Send Data Byte Wait for Data Byte Print to Complete
Figure 19.4 The parallel port write waveform showing the data being strobed out and the system waiting for the _Busy line to become inactive.
PRACTICAL PC INTERFACING
PPortOut( int BaseAddr ) { outp( BaseAddr } // End PPortOut
Enable Data Bit Drivers
2, inp( BaseAddr
2 ) & 0x0DF );
PPortIn( int BaseAddr ) { outp( BaseAddr } // End PPortIn
Disable Data Bit Drivers
2, inp( BaseAddr
2 ) | 0x020 );
PPortIRQEn( int BaseAddr ) // { outp( BaseAddr } //
Enable the Parallel Ports Interrupt // Requesting Hardware 2 ) | 0x010 );
2, inp( BaseAddr
End PPortIRQEn Disable the Parallel Ports Interrupt // Requesting Hardware 2 ) & 0x0EF );
PPortIRQDis( int BaseAddr ) // { outp( BaseAddr } //
2, inp( BaseAddr
End PPortIRQDis Set SLCT In (Pin 17) to an // Electrical High 2 ) | 0x008 );
PPortHiSLCT( Int BaseAddr ) // { outp( BaseAddr } //
2, inp( BaseAddr
End PPortHiSLCT Set SLCT In (Pin 17) to an // Electrical low 2 ) & 0x0F7 );
PPortLoSLCT( Int BaseAddr ) // { outp( BaseAddr } //
2, inp( BaseAddr
End PPortLoSLCT Set Init (Pin 16) to an // Electrical High
PPortHiInit( Int BaseAddr ) // {
PARALLEL PORT
outp( BaseAddr } //
2, inp( BaseAddr
2 ) & 0x0FB );
End PPortHiInit Set Init (Pin 16) to an // Electrical low 2 ) | 0x004 );
PPortLoInit( Int BaseAddr ) // { outp( BaseAddr } //
2, inp( BaseAddr
End PPortLoInit Set Auto FDXT (Pin 14) to an // Electrical High 2 ) & 0x0FD );
PPortHiAuto( Int BaseAddr ) // { outp( BaseAddr } //
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