keyin.c File Reference

#include <global.h>
#include <io/kio.h>

Go to the source code of this file.

Functions
unsigned char	scancode_to_ascii (unsigned char scancode)
	Converts a keyboard scancode to an ASCII character.
unsigned char	Keytoshift (unsigned char ascii)
	Converts an ASCII character to its shifted equivalent.
void	Irq1HandlerC (void)
	IRQ handler for PS/2 keyboard (IRQ1).
char	Kgetkey ()
	Gets the next character from the keyboard buffer (blocking).
void	Kgetstr (char *str, int length)
	Reads a line of input from the keyboard (blocking).
void	Kflush ()
	Flushes the keyboard controller input buffer.

Variables
volatile char	Keybuf [256]
	Circular buffer storing incoming keystrokes.
volatile int	buf_head = 0
	Head index for Keybuf.
volatile int	buf_tail = 0
	Tail index for Keybuf.

Function Documentation

Irq1HandlerC()

void Irq1HandlerC

(

void

)

IRQ handler for PS/2 keyboard (IRQ1).

Reads raw scancode, handles modifier keys (Shift, CapsLock), converts to ASCII, and stores in the Keybuf ring buffer.

Definition at line 130 of file keyin.c.

Keytoshift()

unsigned char Keytoshift

(

unsigned char

ascii

)

Converts an ASCII character to its shifted equivalent.

Parameters

ascii

The base character

Returns

Shifted version of the input character, or the same character if no shift mapping exists.

Definition at line 73 of file keyin.c.

Kflush()

void Kflush

(

)

Flushes the keyboard controller input buffer.

Reads and discards all unread bytes in the controller’s 0x60 port.

Definition at line 219 of file keyin.c.

Kgetkey()

char Kgetkey

(

)

Gets the next character from the keyboard buffer (blocking).

Returns

The next ASCII character from the input buffer.

Definition at line 169 of file keyin.c.

Kgetstr()

void Kgetstr	(	char *	str,
		int	length )

Reads a line of input from the keyboard (blocking).

Handles basic line editing (Enter, Backspace, Delete).

Parameters

str	Destination buffer
length	Maximum buffer length (including null terminator)

Definition at line 186 of file keyin.c.

scancode_to_ascii()

unsigned char scancode_to_ascii

(

unsigned char

scancode

)

Converts a keyboard scancode to an ASCII character.

Parameters

scancode

The raw scancode from keyboard hardware.

Returns

Corresponding ASCII character, or 0 if unmapped.

Definition at line 33 of file keyin.c.

Variable Documentation

buf_head

volatile int buf_head = 0

Head index for Keybuf.

Definition at line 65 of file keyin.c.

buf_tail

volatile int buf_tail = 0

Tail index for Keybuf.

Definition at line 67 of file keyin.c.

Keybuf

volatile char Keybuf[256]

Circular buffer storing incoming keystrokes.

Definition at line 63 of file keyin.c.