190 lines
6.2 KiB
Plaintext
190 lines
6.2 KiB
Plaintext
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;;********************************************************************************
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;; @module ps2_keyboard_text_handler
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;; @type system
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;; @details:
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;; This module processes keyboard scancodes from the ps2_keyboard driver.
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;; It requires a PS/2 keyboard that supports scancode set 3.
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;;
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;; @section What it does
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;; - keeps track of modifier keys: shift, left/right alt, left right meta (super),
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;; control, capslock, numlock, scrollock
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;; - convert valid keycodes to chars, dependening on the state of shift and right alt
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;; - update the keyboard LEDs (numlock, capslock,, scrolllock)
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;; This handler is designed for efficient text input.
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;; It does not track the status of the keys (except modifiers) and is therefore not suitable for games.
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;;
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;; @section How it works
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;; In the init function, the module disables the typematic behaviour for the modifier keys by
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;; sending commands to the keyboard. The 3 lock keys will be set to make only mode and
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;; the others to make release.
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;; This makes tracking the modifier keys much easier and is the reason why scancode set 3
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;; is required, as these commands are only available with that.
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;;
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;; Using scancode set 3 also adds the benefit that all scancodes are only 1 byte large,
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;; making the recognition of scancodes trivial.
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;;
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;; Scancodes from the keyboard are processed immediately, as the handling functions is called
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;; from the keyboard's interrupt handler.
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;;
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;; @subsection Mapping keycodes to chars
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;; The mapping of keycodes to chars is done using an array of chars for each state:
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;; default, shift and right alt. The tables contains the ascii characters, 0 where the keycode does not
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;; generate a character and 1 where the keycode is modifier key.
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;; This approach consumes a relatively large amount of ROM (3 * 144 bytes), but is super fast,
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;; as loading a character is merely one indexed load instruction.
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;; Checking for mod keys is now also fast, beceause we only have to do 1 comparison to see IF it is a modifier key.
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;;
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;; @section How to use it
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;; Call `kb::init` and check if it was successful (Z = 1).
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;; In your program loop, check if kb::keycode is 0. If it is not, a key has been pressed.
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;;
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;; If the keypress generated a character `kb::char` will be non-zero and contain the character.
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;;
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;; Note that if you will probably want to write a 0 to `kb::keycode` and `kb::char`
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;; after processing the keycode. This will not be done by the handler.
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;;
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;; Conditional branches based on the status of a modifier (SHIFT, RALT, LALT, CTRL, META, NUMLOCK, SCROLLLOCK) can be done
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;; using the `bbs` and `bbr` instructions, as each modifier is represented by a bit of the `kb::modifier` variable
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;; in the zeropage.
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;;
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;; @subsection Changing the keyboard behaviour
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;; You can change the typematic rate and delay (see PS/2 keyboard command 0xF3)
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;; and the typematic behavior (make, make/release, typematic) for all keys except the modifier keys.
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;;
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;; You may also send the echo (0xEE) and identify (0xF2) commands to the keyboard.
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;;********************************************************************************
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.ifndef INCLUDE_KEYBOARD_TEXT
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INCLUDE_KEYBOARD_TEXT = 1
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.include "ps2_keyboard.h65"
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.scope kb
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Import kb, init, char, keycode
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Import kb, CHARS_NOMOD, CHARS_MODRALT, CHARS_MODSHIFT, CHARS_NUMLOCK_OFF, CHARS_NUMLOCK_ON
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ImportZp kb, modifier
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.enum MOD
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SHIFT = %10000000 ; set if either capslock is on or shift is pressed
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RALT = %01000000 ; set while rightalt is pressed
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LALT = %00100000 ; set while leftalt is pressed
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META = %00010000 ; set while left or right meta is pressed
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CTRL = %00001000 ; set while left or right ctrl is pressed
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CAPSLOCK = %00000100 ; ps/2 LED
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NUMLOCK = %00000010 ; ps/2 LED
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SCROLLLOCK = %00000001 ; ps/2 LED
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.endenum
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K_BREAK = $F0
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.enum K
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F1 = $07
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ESCAPE = $08
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TAB = $0D
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GRAVE = $0E
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F2 = $0F
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LEFTCTRL = $11
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LEFTSHIFT = $12
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CAPSLOCK = $14
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K_Q = $15
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K_1 = $16
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F3 = $17
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LEFTALT = $19
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K_Y = $1A
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K_S = $1B
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K_A = $1C
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K_W = $1D
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K_2 = $1E
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F4 = $1F
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K_C = $21
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K_X = $22
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K_D = $23
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K_E = $24
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K_4 = $25
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K_3 = $26
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F5 = $27
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SPACE = $29
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K_V = $2A
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K_F = $2B
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K_T = $2C
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K_R = $2D
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K_5 = $2E
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F6 = $2F
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K_N = $31
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K_B = $32
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K_H = $33
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K_G = $34
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K_Z = $35
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K_6 = $36
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F7 = $37
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RIGHTALT = $39
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K_M = $3A
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K_J = $3B
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K_U = $3C
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K_7 = $3D
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K_8 = $3E
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F8 = $3F
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COMMA = $41
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K_K = $42
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K_I = $43
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K_O = $44
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K_0 = $45
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K_9 = $46
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F9 = $47
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DOT = $49
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DASH = $4A
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KPDIVIDE = $4A
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K_L = $4B
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OUML = $4C
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K_P = $4D
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SSHARP = $4E
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KPMINUS = $4E
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F10 = $4F
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AUML = $52
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UUML = $54
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BACKTICK = $55
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F11 = $56
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PRINT = $57
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RIGHTCTRL = $58
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RIGHTSHIFT = $59
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ENTER = $5A
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PLUS = $5B
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LESSTHAN = $5C
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HASH = $5D
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F12 = $5E
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SCROLLLOCK = $5F
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RIGHT = $60
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LEFT = $61
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PAUSE = $62
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UP = $63
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DELETE = $64
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END = $65
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BACKSPACE = $66
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INSERT = $67
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KP1 = $69
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DOWN = $6A
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KP4 = $6B
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KP7 = $6C
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PAGEDOWN = $6D
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POS1 = $6E
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PAGEUP = $6F
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KP0 = $70
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KPDOT = $71
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KP2 = $72
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KP5 = $73
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KP6 = $74
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KP8 = $75
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NUMLOCK = $76
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KPENTER = $79
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KP3 = $7A
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KPPLUS = $7C
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KP9 = $7D
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KPASTERISK = $7E
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LEFTMETA = $8B
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RIGHTMETA = $8C
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MENU = $8D
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.endenum
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.endscope
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.endif ; guard
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