2023-12-27 21:40:14 +01:00
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;;********************************************************************************
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;; @module keyboard
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;; @type drive
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;; @details:
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;; Support for a PS2 Keyboard using the shift register of a 6522 VIA
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2023-12-31 01:59:06 +01:00
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;; Pressing a key causes 11 bits to be sent: 1 start - 8 scancode - 1 parity - 1 stop
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2023-12-27 21:40:14 +01:00
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;; The VIA is set up to interrupt after 8 bits have been shifted into the shift register
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;; from the external clock pulses of the keyboard (additional hardware required to
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;; address the hardware bug of the VIA, where bit get lost when the external clock
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;; transition happens during falling edge of PHI2). After reading the shift register,
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;; the VIAs T2 timer is set to interrupt after the last 3 bits have been shifted in,
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;; which takes about ~230ms.
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;;********************************************************************************
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.ifndef INCLUDE_KEYBOARD
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INCLUDE_KEYBOARD = 1
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.include "system.h65"
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.scope kb
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2023-12-31 01:59:06 +01:00
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Import kb,init,irq_shift_reg_handler,irq_timer_handler,scancode,key_read
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Import kb, CHARS_NOMOD, CHARS_MODSHIFT
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ImportZp kb,status
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2023-12-27 21:40:14 +01:00
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KB_IO = IO1
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2023-12-31 01:59:06 +01:00
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.enum STATUS
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RELEASE = %10000000
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TWOBYTE = %01000000
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SHIFT = %00100000
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CAPSLOCK = %00010000
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CAPSLOCK_HELD = %00000010
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RIGHTALT = %00001000
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NUMLOCK = %00000100
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.endenum
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K_TWOBYTE = $E0
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K_RELEASE = $F0
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.enum K
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F9 = $01
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F5 = $03
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F3 = $04
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F1 = $05
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F2 = $06
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F12 = $07
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F10 = $09
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F8 = $0A
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F6 = $0B
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F4 = $0C
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TAB = $0D
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GRAVE = $0E
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LEFTALT = $11
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LEFTSHIFT = $12
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LEFTCTRL = $14
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K_Q = $15
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K_1 = $16
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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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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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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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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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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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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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DOT = $49
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DASH = $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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AUML = $52
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UUML = $54
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BACKTICK = $55
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CAPSLOCK = $58
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RIGHTSHIFT = $59
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ENTER = $5A
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PLUS = $5B
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HASH = $5D
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LESSTHAN = $61
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BACKSPACE = $66
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KP1 = $69
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KP4 = $6B
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KP7 = $6C
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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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ESCAPE = $76
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NUMLOCK = $77
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F11 = $78
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KPPLUS = $79
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KP3 = $7A
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KPMINUS = $7B
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KPASTERISK = $7C
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KP9 = $7D
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SCROLLLOCK = $7E
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F7 = $83
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.endenum
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.enum K2
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RIGHTALT = $11
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RIGHTCTRL = $14
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LEFTMETA = $1F
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RIGHTMETA = $27
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MENU = $2F
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BREAK = $37
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SYSRQ = $3F
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KPDIVIDE = $4A
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KPENTER = $5A
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END = $69
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LEFT = $6B
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POS1 = $6C
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INSERT = $70
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DELETE = $71
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DOWN = $72
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RIGHT = $74
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UP = $75
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PAGEDOWN = $7A
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PAGEUP = $7D
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.endenum
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2023-12-27 21:40:14 +01:00
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.endscope
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2023-12-31 01:59:06 +01:00
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.endif ; guard
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