pit.c File Reference

#include "pit.h"
#include "../io/io.h"

Include dependency graph for pit.c:

Go to the source code of this file.

Macros
#define	PIT_PORT   0x40
#define	PIT_CMD_PORT   0x43
#define	PIT_FREQUENCY   1193182

Functions
void	__pinit (void)
	pinit initializes the programmable interval timer
void	__delay (uint32_t ms)
	delay pauses execution for a number of milliseconds

Macro Definition Documentation

PIT_CMD_PORT

#define PIT_CMD_PORT   0x43

Definition at line 5 of file pit.c.

Referenced by __delay(), and __pinit().

PIT_FREQUENCY

#define PIT_FREQUENCY   1193182

Definition at line 6 of file pit.c.

Referenced by __pinit().

PIT_PORT

#define PIT_PORT   0x40

Definition at line 4 of file pit.c.

Referenced by __delay(), and __pinit().

Function Documentation

__delay()

void __delay

(

uint32_t

ms

)

delay pauses execution for a number of milliseconds

delay is a function that busy-waits on the pit counter for the specified number of milliseconds

Parameters

ms,the

number of milliseconds to wait

using delay is done with

#include "../lib/pit.h" //or just pit.h
delay(500); //wait half a second

See also

pinit()

Definition at line 46 of file pit.c.

References inb, outb, PIT_CMD_PORT, and PIT_PORT.

__pinit()

void __pinit

(

void

)

pinit initializes the programmable interval timer

pinit is a function that configures the pit to fire at 1000 hz providing 1ms resolution for timing purposes

using pinit is done with

#include "../lib/pit.h" //or just pit.h
pinit();

See also

delay()

Definition at line 22 of file pit.c.

References outb, PIT_CMD_PORT, PIT_FREQUENCY, and PIT_PORT.