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ti/kbd: add alpha support

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ref #41
This commit is contained in:
Virgil Dupras 2019-11-08 15:45:45 -05:00
parent ca8b315e9d
commit 8d5c26f299
1 changed files with 24 additions and 2 deletions
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26
kernel/ti/kbd.asm
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@ -24,11 +24,17 @@ kbdGetC:
push bc
push hl
; loop until a digit is pressed
; During this GetC loop, register C holds the modificators (Alpha, 2nd)
ld c, 0
; loop until a digit is pressed
.loop:
ld hl, .dtbl
; we go through the 7 rows of the table
ld b, 7
; is alpha mod enabled?
bit 0, c
jr z, .inner ; unset? skip next
ld hl, .atbl ; set? we're in alpha mode
.inner:
ld a, (hl) ; group mask
call .get
@ -54,6 +60,11 @@ kbdGetC:
ld a, (hl)
or a ; is char 0?
jr z, .loop ; yes? unsupported. loop.
cp 0x80 ; is it alpha?
jr nz, .notalpha
set 0, c
jr .loop
.notalpha:
; wait until all keys are de-pressed
push af ; --> lvl 1
@ -81,11 +92,22 @@ kbdGetC:
; digits table. each row represents a group. first item is group mask.
; 0 means unsupported. no group 7 because it has no keys.
; 0x80 is a special value for ALPHA key which is never returned directly.
.dtbl:
.db 0xfe, 0, 0, 0, 0, 0, 0, 0, 0
.db 0xfd, 0x0d, '+' ,'-' ,'*', '/', '^', 0, 0
.db 0xfb, 0, '3', '6', '9', ')', 0, 0, 0
.db 0xf7, '.', '2', '5', '8', '(', 0, 0, 0
.db 0xef, '0', '1', '4', '7', ',', 0, 0, 0
.db 0xdf, 0, 0, 0, 0, 0, 0, 0, 0
.db 0xdf, 0, 0, 0, 0, 0, 0, 0, 0x80
.db 0xbf, 0, 0, 0, 0, 0, 0, 0, 0x7f
; alpha table. same as .dtbl, for when we're in alpha mode.
.atbl:
.db 0xfe, 0, 0, 0, 0, 0, 0, 0, 0
.db 0xfd, 0x0d, '"' ,'W' ,'R', 'M', 'H', 0, 0
.db 0xfb, '?', 0, 'V', 'Q', 'L', 'G', 0, 0
.db 0xf7, ':', 'Z', 'U', 'P', 'K', 'F', 'C', 0
.db 0xef, '_', 'Y', 'T', 'O', 'J', 'E', 'B', 0
.db 0xdf, 0, 'X', 'S', 'N', 'I', 'D', 'A', 0x80
.db 0xbf, 0, 0, 0, 0, 0, 0, 0, 0x7f