Reading ps/2 keyboard, but somehow, keycodes are decremented by 1
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Daniele Verducci su MatissePenguin
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2366408679
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assets/misc/ps2_modeset_2_to_ascii.ods
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BIN
assets/misc/ps2_modeset_2_to_ascii.ods
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@ -3,9 +3,9 @@
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; Based on PS/2 protocol as documented on http://www.lucadavidian.com/2017/11/15/interfacing-ps2-keyboard-to-a-microcontroller/
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;
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; The CLK and Data pin of the PS/2 keyboard are fed into two cascated serial-in parallel-out shift registers.
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; Their outputs are connected to the Pat80 data bus via a buffer activated by the selected
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; I/O EN signal and their RESET is connected to I/O Address line 0 of the keyboard I/O port.
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; Being RESET active low, they will be erased when the PAT80 reads (or writes) anything at address 0
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; Their outputs are connected to the Pat80 data bus via a buffer activated by the selected
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; I/O EN signal and their RESET is connected to I/O Address line 0 of the keyboard I/O port.
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; Being RESET active low, they will be erased when the PAT80 reads (or writes) anything at address 0
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; of the keyboard I/0 port.
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;
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; Thus, the read cycle is:
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@ -20,7 +20,7 @@
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; behave strangely (will drop next pressed key). This is not a problem, as the computer, once completed, will
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; have a 60% keyboard, without any of the unusable keys.
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include 'ps2_keyboard_scancodeset2.asm' ; PS/2 Scan Codeset 2 mappings
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include 'drivers/ps2_keyboard_scancodeset2.asm' ; PS/2 Scan Codeset 2 mappings
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; config (IO port 1)
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PS2KEYB_CLEAR_REG: EQU IO_2
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@ -35,19 +35,20 @@ PS2KEYB_BREAK: EQU 0xF0 - %10000000 ; The MSB is dropped: see NOTE on intro a
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PS2Keyb_readc:
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in a, (PS2KEYB_DATA_REG) ; reads a character
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add a, 0
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jp z, Term_readc ; if char is 0 (NULL), user didn't press any key: wait for character
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; we found something, allow the keyboard to complete data transmission
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jp z, PS2Keyb_readc ; if char is 0 (NULL), user didn't press any key: wait for character
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; we found something, but it may still be shifting in bits. Allow the keyboard to complete data transmission
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ld a, PS2KEYB_TRANSMISSION_DURATION/5 ; every cycle is 5 CPU cycles
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ps2keyb_readc_waitloop:
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sub 1
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jr nz, ps2keyb_readc_waitloop
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; data transmission should now be complete.
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; check if code is a Break Code. If it is, discard next key as it is a released key
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ld c, a ; save a
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in a, (PS2KEYB_DATA_REG) ; re-reads the character (it should now be complete)
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ld c, a ; save a, because it will be modified by next compare
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cp PS2KEYB_BREAK ; compare a with Break Code
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jp z, ps2keyb_readc_discard ; if it is a Break Code, jump to discarder routine
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; we read a valid character: clean key registers
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in a, PS2KEYB_CLEAR_REG
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in a, (PS2KEYB_CLEAR_REG)
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; now we will convert keycode in c to ASCII code
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ld hl, PS2KEYB_SCANCODESET_ASCII_MAP ; load start of codeset to ascii map
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ld b, 0 ; reset b, as we are going to do a sum with bc (where c contains the read scancode)
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@ -56,7 +57,7 @@ PS2Keyb_readc:
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ret ; returns in the a register
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ps2keyb_readc_discard:
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; clean key registers
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in a, PS2KEYB_CLEAR_REG
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in a, (PS2KEYB_CLEAR_REG)
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ps2keyb_readc_discard_waitfordata:
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; wait for next non-0 keycode and discards it (it is the code of the released key)
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in a, (PS2KEYB_DATA_REG) ; reads a character
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@ -68,5 +69,5 @@ PS2Keyb_readc:
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sub 1
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jr nz, ps2keyb_readc_discard_waitloop
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; data transmission should now be complete, throw away key code
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in a, PS2KEYB_CLEAR_REG
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in a, (PS2KEYB_CLEAR_REG)
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jp PS2Keyb_readc ; go back and wait for another keycode
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@ -2,136 +2,136 @@
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;
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; Keycodes 0 to 83
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.db PS2KEYB_SCANCODESET_ASCII_MAP: .db 0 ; (Unused)
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.db 0 ; F9
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.db 0 ; (Control key)
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.db 0 ; F5
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.db 0 ; F3
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.db 0 ; F1
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.db 0 ; F2
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.db 0 ; F12
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.db 0 ; (Control key)
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.db 0 ; F10
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.db 0 ; F8
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.db 0 ; F6
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.db 0 ; F4
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.db 9 ; TAB
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.db 96 ; `
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 0 ; L ALT
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.db 0 ; L SHFT
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.db 0 ; (Control key)
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.db 0 ; L CTRL
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.db 1 ; Q
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.db 2 ; 1
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 3 ; Z
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.db 4 ; S
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.db 65 ; A
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.db 66 ; W
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.db 67 ; 2
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 68 ; C
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.db 69 ; X
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.db 70 ; D
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.db 71 ; E
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.db 72 ; 4
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.db 73 ; 3
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 32 ; SPACE
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.db 33 ; V
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.db 34 ; F
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.db 35 ; T
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.db 36 ; R
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.db 37 ; 5
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 38 ; N
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.db 39 ; B
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.db 40 ; H
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.db 41 ; G
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.db 42 ; Y
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.db 43 ; 6
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 44 ; M
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.db 45 ; J
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.db 46 ; U
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.db 47 ; 7
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.db 48 ; 8
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 44 ; ,
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.db 45 ; K
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.db 46 ; I
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.db 47 ; O
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.db 48 ; 0
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.db 49 ; 9
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 46 ; .
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.db 47 ; /
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.db 48 ; L
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.db 59 ; ;
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.db 60 ; P
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.db 45 ; -
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 39 ; '
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.db 0 ; (Unused)
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.db 91 ; [
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.db 61 ; =
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 0 ; CAPS
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.db 0 ; R SHFT
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.db 10 ; ENTER
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.db 93 ; ]
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.db 0 ; (Unused)
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.db 92 ; \
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 8 ; BKSP
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 9 ; KP 1
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.db 0 ; (Unused)
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.db 10 ; KP 4 -- NOTE: shadowed by break code (see the NOTE in ps2_keyboard.asm)
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.db 11 ; KP 7
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 0 ; (Unused)
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.db 48 ; KP 0
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.db 46 ; KP .
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.db 47 ; KP 2
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.db 48 ; KP 5
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.db 49 ; KP 6
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.db 50 ; KP 8
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.db 27 ; ESC
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.db 0 ; NUM
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.db 0 ; F11
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.db 43 ; KP +
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.db 44 ; KP 3
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PS2KEYB_SCANCODESET_ASCII_MAP: DB 0 ; (Unused)
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DB 0 ; F9
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DB 0 ; (Control key)
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DB 0 ; F5
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DB 0 ; F3
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DB 0 ; F1
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DB 0 ; F2
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DB 0 ; F12
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DB 0 ; (Control key)
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DB 0 ; F10
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DB 0 ; F8
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DB 0 ; F6
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DB 0 ; F4
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DB 9 ; TAB
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DB 96 ; `
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 0 ; L ALT
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DB 0 ; L SHFT
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DB 0 ; (Control key)
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DB 0 ; L CTRL
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DB 1 ; Q
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DB 2 ; 1
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 3 ; Z
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DB 4 ; S
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DB 65 ; A
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DB 66 ; W
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DB 67 ; 2
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 68 ; C
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DB 69 ; X
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DB 70 ; D
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DB 71 ; E
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DB 72 ; 4
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DB 73 ; 3
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 32 ; SPACE
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DB 33 ; V
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DB 34 ; F
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DB 35 ; T
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DB 36 ; R
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DB 37 ; 5
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 38 ; N
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DB 39 ; B
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DB 40 ; H
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DB 41 ; G
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DB 42 ; Y
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DB 43 ; 6
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 44 ; M
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DB 45 ; J
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DB 46 ; U
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DB 47 ; 7
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DB 48 ; 8
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 44 ; ,
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DB 45 ; K
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DB 46 ; I
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DB 47 ; O
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DB 48 ; 0
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DB 49 ; 9
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 46 ; .
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DB 47 ; /
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DB 48 ; L
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DB 59 ; ;
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DB 60 ; P
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DB 45 ; -
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 39 ; '
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DB 0 ; (Unused)
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DB 91 ; [
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DB 61 ; =
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 0 ; CAPS
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DB 0 ; R SHFT
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DB 10 ; ENTER
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DB 93 ; ]
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DB 0 ; (Unused)
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DB 92 ; \
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 8 ; BKSP
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 9 ; KP 1
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DB 0 ; (Unused)
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DB 10 ; KP 4 -- NOTE: shadowed by break code (see the NOTE in ps2_keyboard.asm)
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DB 11 ; KP 7
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 0 ; (Unused)
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DB 48 ; KP 0
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DB 46 ; KP .
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DB 47 ; KP 2
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DB 48 ; KP 5
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DB 49 ; KP 6
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DB 50 ; KP 8
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DB 27 ; ESC
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DB 0 ; NUM
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DB 0 ; F11
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DB 43 ; KP +
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DB 44 ; KP 3
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; The following codes are unrecognized by PAT80, as it uses only 7 bits (see the NOTE in ps2_keyboard.asm)
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; .db 45 ; KP -
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; .db 42 ; KP *
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; .db 43 ; KP 9
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; .db 0 ; SCROLL
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; .db 0 ; (Control key)
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; .db 0 ; (Control key)
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; .db 0 ; (Control key)
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; .db 0 ; (Control key)
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; .db 0 ; F7
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; DB 45 ; KP -
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; DB 42 ; KP *
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; DB 43 ; KP 9
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; DB 0 ; SCROLL
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; DB 0 ; (Control key)
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; DB 0 ; (Control key)
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; DB 0 ; (Control key)
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; DB 0 ; (Control key)
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; DB 0 ; F7
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@ -116,9 +116,19 @@ Sysinit:
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call Sys_Beep
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; Run memory monitor
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ei ; enable maskabpe interrupts
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im 1 ; set interrupt mode 1 (on interrupt jumps to 0x38)
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rst 0x38 ; throw fake interrupt: jump to interrupt routine to start monitor
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; ei ; enable maskabpe interrupts
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; im 1 ; set interrupt mode 1 (on interrupt jumps to 0x38)
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; rst 0x38 ; throw fake interrupt: jump to interrupt routine to start monitor
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; Keyboard test
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ld a, 0x3E
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call Sys_Printc
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ktestloop:
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call Sys_Readc
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call Sys_Printc
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ld a, 46
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call Sys_Printc
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jp ktestloop
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; User exited from memory monitor without loading a program. Do nothing.
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mloop:
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