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clock.h File Reference

The system clock headers. More...

Go to the source code of this file.

Data Structures
struct	timeout
	Timeout variable structure. More...
Defines
#define	LATCH_COUNT   0x00
	To copy chip count.
#define	TIMER0   0x40
	I/O port for timer channel 0.
#define	TIMER2   0x42
	I/O port for timer channel 2.
#define	TIMER_MODE   0x43
	I/O port for timer mode control.
#define	SQUARE_WAVE   0x36
	The sqare-wave form.
#define	TIMER_FREQ   1193182L
	Clock frequency for timer in PC.
#define	TIMER_COUNT   (unsigned)(TIMER_FREQ/HZ)
	Value to initialize timer.
#define	LATCH   ((TIMER_FREQ + HZ/2) / HZ)
	LATCH is used for the interval timer.
#define	HZ   200
	Clock Frequancy (User settable, default=200Hz).
#define	usleep(m)   delay(m)
	Macro equivalent to delay(dword millisec).
Typedefs
typedef timeout	timeout_t
	Timeout variable structure.
Functions
void	init_clock ()
	Initialize channel 0 of the 8253A timer.
void	stop_clock ()
	Reset the clock for rebooting.
dword	sys_get_ticks (void)
	Return the system ticks. Returns: The system ticks.
void	delay (dword millisec)
	Delay some milliseconds Parameters: millisec  How many milliseconds you want to delay.
void	set_timeout (timeout_t *t, unsigned int millisec)
	Initialize a timeout variable. Parameters: t  The timeout variable. millisec  How many milliseconds have to elapse before the timeout occurs.
bool	is_timeout (timeout_t *t)
	Check if a timeout has been elapsed. Parameters: t  The timeout variable.
void	clock_thread ()
	This is a task that occurs at every clock tick.

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Detailed Description

The system clock headers.

Author:

Andrea Righi <drizzt@inwind.it>

Date:

Last update: 2003-11-01

Note:

Copyright (©) 2003 Andrea Righi

Definition in file clock.h.

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