100 lines
4 KiB
C
100 lines
4 KiB
C
/*
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Copyright 2009 Denver Gingerich (denver [at] ossguy [dot] com)
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Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/*
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NOTE: The user of this include file MUST define the following macros
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prior to including the file:
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MAG_T1_CLOCK_PIN Pin connected to Track 1 clock wire (ie. PORTC1)
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MAG_T1_DATA_PIN Pin connected to Track 1 data wire (ie. PORTC2)
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MAG_T2_CLOCK_PIN Pin connected to Track 2 clock wire (ie. PORTC3)
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MAG_T2_DATA_PIN Pin connected to Track 2 data wire (ie. PORTC0)
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MAG_T3_CLOCK_PIN Pin connected to Track 3 clock wire (ie. PORTC5)
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MAG_T3_DATA_PIN Pin connected to Track 3 data wire (ie. PORTC6)
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MAG_CLS_PIN Pin connected to card loaded wire (ie. PORTC4)
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MAG_PIN PIN macro for the reader's port (ie. PINC)
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MAG_DDR DDR macro for the reader's port (ie. DDRC)
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MAG_PORT PORT macro for the reader's port (ie. PORTC)
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The example macros listed above assume that the Track 2 data wire is
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connected to pin 0 on port C, the Track 2 clock wire is connected to
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pin 3 on port C (similarly for Tracks 1 and 3), and the card loaded
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wire is connected to pin 4 on port C.
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If the magstripe reader you are using only reads one or two tracks,
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then set the clock and data pins for the tracks it doesn't read to a
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pin that is unused. For example, on the AT90USBKey, any of the pins on
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port C that do not have wires attached will be unused since they are
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not connected to any onboard devices (such as the joystick or
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temperature sensor).
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Connecting wires to pins on different ports (ie. a data wire to pin 0
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on port C and a clock wire to pin 0 on port D) is currently
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unsupported. All pins specified above must be on the same port.
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*/
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/** \file
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*
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* Driver header for a TTL Magnetic Card reader device (such as the Omron V3B-4K).
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*/
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#ifndef _MAGSTRIPEHW_H_
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#define _MAGSTRIPEHW_H_
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/* Includes: */
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#include <avr/io.h>
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#include <LUFA/Common/Common.h>
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/* Private Interface - For use in library only: */
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/* Macros: */
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/** Mask of the track data, clock and card detection pins. */
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#define MAG_MASK (MAG_T1_DATA | MAG_T1_CLOCK | \
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MAG_T2_DATA | MAG_T2_CLOCK | \
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MAG_T3_DATA | MAG_T3_CLOCK | \
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MAG_CARDPRESENT)
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/* Public Interface - May be used in end-application: */
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/* Inline Functions: */
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/** Initializes the magnetic stripe card reader ports and pins so that the card reader
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* device can be controlled and read by the card reader driver. This must be called before
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* trying to read any of the card reader's status lines.
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*/
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static inline void Magstripe_Init(void)
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{
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MAG_DDR &= ~MAG_MASK;
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MAG_PORT |= MAG_MASK;
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};
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/** Returns the status of all the magnetic card reader's outputs.
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*
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* \return A mask indicating which card lines are high or low
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*/
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static inline uint8_t Magstripe_GetStatus(void) ATTR_WARN_UNUSED_RESULT;
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static inline uint8_t Magstripe_GetStatus(void)
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{
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/* Magstripe IOs are active low and must be inverted when read */
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return ((uint8_t)~MAG_PIN & MAG_MASK);
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}
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#endif
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