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sms: Pad WIP
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parent
1597f1e131
commit
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2
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@ -1,3 +1,3 @@
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Sega Master System Recipe
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Sega Master System Recipe
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622 VDP
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622 VDP 630 PAD
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@ -13,4 +13,4 @@ the screen is reached, we wrap up to the top.
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When reaching a new line, we clear that line and the next to
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When reaching a new line, we clear that line and the next to
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help readability.
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help readability.
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Load range: 623-623
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Load range: 623-628
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16
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16
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Pad driver - read input from MD controller
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Conveniently expose an API to read the status of a MD pad A.
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Moreover, implement a mechanism to input arbitrary characters
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from it. It goes as follow:
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* Direction pad select characters. Up/Down move by one,
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Left/Right move by 5
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* Start acts like Return
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* A acts like Backspace
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* B changes "character class": lowercase, uppercase, numbers,
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special chars. The space character is the first among special
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chars.
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* C confirms letter selection
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(cont.)
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6
blk/631
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6
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This module is currently hard-wired to VDP driver, that is, it
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calls vdp's routines during (key) to update character
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selection.
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Load range: 632-637
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12
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: _prevstat [ PAD_MEM LITN ] ;
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: _sel [ PAD_MEM 1+ LITN ] ;
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: _next [ PAD_MEM 2+ LITN ] ;
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( Put status for port A in register A. Bits, from MSB to LSB:
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Start - A - C - B - Right - Left - Down - Up
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Each bit is high when button is unpressed and low if button is
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pressed. When no button is pressed, 0xff is returned.
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This logic below is for the Genesis controller, which is modal.
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TH is an output pin that swiches the meaning of TL and TR. When
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TH is high (unselected), TL = Button B and TR = Button C. When
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TH is low (selected), TL = Button A and TR = Start. )
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15
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15
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CODE _status
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A 0b11111101 LDrn, ( TH output, unselected )
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PAD_CTLPORT OUTnA,
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PAD_D1PORT INAn,
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0x3f ANDn, ( low 6 bits are good )
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B A LDrr, ( let's store them )
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( Start and A are returned when TH is selected, in bits 5 and
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4. Well get them, left-shift them and integrate them to B. )
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A 0b11011101 LDrn, ( TH output, selected )
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PAD_CTLPORT OUTnA,
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PAD_D1PORT INAn,
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0b00110000 ANDn,
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A SLAr, A SLAr, B ORr,
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PUSHA,
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;CODE
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5
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5
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@ -0,0 +1,5 @@
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: _chk ( c --, check _sel range )
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_sel C@ DUP 0x7f > IF 0x20 _sel C! THEN
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0x20 < IF 0x7f _sel C! THEN ;
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: _nxtcls
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;
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13
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: _updsel ( -- f, has an action button been pressed? )
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_status _prevstat C@ OVER = IF DROP 0 EXIT THEN
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DUP _prevstat C! ( changed, update ) ( s )
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0x01 ( UP ) OVER AND NOT IF 1 _sel +! THEN
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0x02 ( DOWN ) OVER AND NOT IF -1 _sel +! THEN
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0x04 ( LEFT ) OVER AND NOT IF -5 _sel +! THEN
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0x08 ( RIGHT ) OVER AND NOT IF 5 _sel +! THEN
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0x10 ( BUTB ) OVER AND NOT IF _nxtcls THEN
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( update sel in VDP )
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_sel C@ (emit) -1 XYPOS +!
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( return whether any of the high 3 bits is low )
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0xe0 AND 0xe0 <
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;
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8
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8
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: (key)
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BEGIN _updsel UNTIL
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_prevstat C@
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0x20 ( BUTC ) OVER AND NOT IF THEN
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0x40 ( BUTA ) AND NOT IF THEN
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( If not BUTC or BUTA, it has to be START )
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_sel C@
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;
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@ -8,6 +8,9 @@ RAMSTART 0x70 + CONSTANT VDP_MEM
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0xbe CONSTANT VDP_DATAPORT
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0xbe CONSTANT VDP_DATAPORT
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32 CONSTANT VDP_COLS
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32 CONSTANT VDP_COLS
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24 CONSTANT VDP_ROWS
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24 CONSTANT VDP_ROWS
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RAMSTART 0x72 + CONSTANT PAD_MEM
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0x3f CONSTANT PAD_CTLPORT
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0xdc CONSTANT PAD_D1PORT
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212 LOAD ( z80 assembler )
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212 LOAD ( z80 assembler )
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: ZFILL, ( u ) 0 DO 0 A, LOOP ;
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: ZFILL, ( u ) 0 DO 0 A, LOOP ;
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262 LOAD ( xcomp )
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262 LOAD ( xcomp )
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@ -23,11 +26,11 @@ CURRENT @ XCURRENT !
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393 LOAD ( xcomp core low )
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393 LOAD ( xcomp core low )
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CREATE ~FNT CPFNT7x7
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CREATE ~FNT CPFNT7x7
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623 628 LOADR ( VDP )
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623 628 LOADR ( VDP )
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: (key) 4 ;
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632 637 LOADR ( PAD )
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420 LOAD ( xcomp core high )
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420 LOAD ( xcomp core high )
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(entry) _
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(entry) _
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( Update LATEST )
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( Update LATEST )
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PC ORG @ 8 + !
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PC ORG @ 8 + !
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," VDP$ " EOT,
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," VDP$ PAD$ " EOT,
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ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
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ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
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H@ 256 /MOD 2 PC! 2 PC!
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H@ 256 /MOD 2 PC! 2 PC!
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