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recipes/sms: Add pad-oriented character selection

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This commit is contained in:
Virgil Dupras 2019-07-02 13:15:24 -04:00
parent 2679172edf
commit dd84c11905
1 changed files with 5 additions and 43 deletions
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48
recipes/sms/glue.asm
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@ -33,54 +33,16 @@ init:
call padInit
call vdpInit
ld hl, padUpdateSel
ld (VDP_CHRSELHOOK), hl
ld hl, myGetC
ld hl, padGetC
ld de, vdpPutC
call stdioInit
call shellInit
ld hl, vdpShellLoopHook
ld (SHELL_LOOPHOOK), hl
jp shellLoop
myGetC:
; What we do here is simple. We go though all bits of port A controller
; increasing B each time. As soon as we get a hit, we display that
; letter. Pressed buttons go low.
call padStatusA
push bc
jr z, .nothing ; unchanged since last poll
ld b, 'A'
bit 5, a ; Port A Button C pressed
jr z, .something
inc b ; b
bit 4, a ; Port A Button B pressed
jr z, .something
inc b ; c
bit 3, a ; Port A Right pressed
jr z, .something
inc b ; d
bit 2, a ; Port A Left pressed
jr z, .something
inc b ; e
bit 1, a ; Port A Down pressed
jr z, .something
inc b ; f
bit 0, a ; Port A Up pressed
jr z, .something
inc b ; g
bit 6, a ; Port A Button A pressed
jr z, .something
inc b ; h
bit 7, a ; Port A Start pressed
jr z, .something
; nothing
.nothing:
pop bc
xor a
jp unsetZ
.something:
ld a, b
pop bc
cp a ; ensure Z
ret
.fill 0x7ff0-$
.db "TMR SEGA", 0x00, 0x00, 0xfb, 0x68, 0x00, 0x00, 0x00, 0x4c