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42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
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/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: Parallel Port Function Driver
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* FILE: drivers/parallel/parport/hardware.h
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* PURPOSE: Hardware definitions
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*/
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#ifndef _HARDWARE_H_
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#define _HARDWARE_H_
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/*
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* The following constants describe the various signals of the printer port
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* hardware. Note that the hardware inverts some signals and that some
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* signals are active low. An example is LP_STROBE, which must be programmed
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* with 1 for being active and 0 for being inactive, because the strobe signal
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* gets inverted, but it is also active low.
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*/
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/*
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* bit defines for 8255 status port
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* base + 1
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* accessed with LP_S(minor), which gets the byte...
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*/
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#define LP_PBUSY 0x80 /* inverted input, active high */
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#define LP_PACK 0x40 /* unchanged input, active low */
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#define LP_POUTPA 0x20 /* unchanged input, active high */
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#define LP_PSELECD 0x10 /* unchanged input, active high */
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#define LP_PERRORP 0x08 /* unchanged input, active low */
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/*
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* defines for 8255 control port
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* base + 2
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* accessed with LP_C(minor)
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*/
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#define LP_PINTEN 0x10
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#define LP_PSELECP 0x08 /* inverted output, active low */
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#define LP_PINITP 0x04 /* unchanged output, active low */
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#define LP_PAUTOLF 0x02 /* inverted output, active low */
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#define LP_PSTROBE 0x01 /* inverted output, active low */
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#endif /* _HARDWARE_H_ */
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