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Keysadds

Data Structures
struct	_KEYSDCB
Defines
#define	CHAR_CHECK_TIME   100
#define	CHAR_REPEAT_TIME   800
#define	A   1
#define	B   2
#define	C   3
#define	D   4
#define	E   5
Typedefs
typedef _KEYSDCB	KEYSDCB
Functions
char	getK (void)
char	getKey (void)
Variables
NUTDEVICE	devKeys0

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Detailed Description

This module is designed for managing keys contecetd to procesor port. This driver is a stream device. Driver contains thread, which scans port with defined freuqency and when port status != 0xff put this port status to buffer. You can read from this device using stream functions.

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Define Documentation

#define A   1

Constant defines that keys is connected to PORTA. Use it as a device address in InitNutDevice function.

#define B   2

Constant defines that keys is connected to PORTB. Use it as a device address in InitNutDevice function.

#define C   3

Constant defines that keys is connected to PORTC. Use it as a device address in InitNutDevice function.

#define CHAR_CHECK_TIME   100

Defines key scan delay

#define CHAR_REPEAT_TIME   800

Defines key repeat time.

#define D   4

Constant defines that keys is connected to PORTD. Use it as a device address in InitNutDevice function.

#define E   5

Constant defines that keys is connected to PORTE. Use it as a device address in InitNutDevice function.

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Typedef Documentation

typedef struct _KEYSDCB KEYSDCB

Device control block for keys driver. Required for NUT device driver.

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Function Documentation

char getK (  void    )

Read key from buffer Key - it's the port value scaned by driver thread. Methods block user thread if key buffor is empty. Returns: key from buffor. Examples: adds/app/keys.

char getKey (  void    )

Read key from buffer Key - it's the port value scaned by driver thread. Methods don't block user thread if key buffer is empty. Returns: key from buffer if buffer isn't empty -1 when buffor is empty. Examples: adds/app/keys.

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Variable Documentation

NUTDEVICE devKeys0

Driver control structure.

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