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sms: CPORT_CTL is write-only!

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why did I think that I could read from it?
This commit is contained in:
Virgil Dupras 2020-11-08 08:43:24 -05:00
parent 6cb310c38c
commit 2b8524d11e
8 changed files with 18 additions and 25 deletions
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13
arch/z80/sms/blk/625
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@ -1,15 +1,16 @@
( Routines for interacting with SMS controller ports.
Requires CPORT_CTL, CPORT_D1 and CPORT_D2 to be defined.
Will usually be 0x3f, 0xdc, 0xdd. )
Requires CPORT_MEM, CPORT_CTL, CPORT_D1 and CPORT_D2 to be
defined. CPORT_MEM is a 1 byte buffer for CPORT_CTL. The last
3 consts will usually be 0x3f, 0xdc, 0xdd. )
( mode -- set TR pin on mode a on:
0= output low 1=output high 2=input )
CODE _TRA! HL POP, chkPS, ( B0 -> B4, B1 -> B0 )
L RR, RLA, RLA, RLA, RLA, L RR, RLA,
0x11 ANDi, L A LDrr, CPORT_CTL INAi,
0xee ANDi, L ORr, CPORT_CTL OUTiA,
0x11 ANDi, L A LDrr, CPORT_MEM LDA(i),
0xee ANDi, L ORr, CPORT_CTL OUTiA, CPORT_MEM LD(i)A,
;CODE
CODE _THA! HL POP, chkPS, ( B0 -> B5, B1 -> B1 )
L RR, RLA, RLA, RLA, RLA, L RR, RLA, RLA,
0x22 ANDi, L A LDrr, CPORT_CTL INAi,
0xdd ANDi, L ORr, CPORT_CTL OUTiA,
0x22 ANDi, L A LDrr, CPORT_MEM LDA(i),
0xdd ANDi, L ORr, CPORT_CTL OUTiA, CPORT_MEM LD(i)A,
;CODE

8
arch/z80/sms/blk/626
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@ -1,12 +1,12 @@
CODE _TRB! HL POP, chkPS, ( B0 -> B6, B1 -> B2 )
L RR, RLA, RLA, RLA, RLA, L RR, RLA, RLA, RLA,
0x44 ANDi, L A LDrr, CPORT_CTL INAi,
0xbb ANDi, L ORr, CPORT_CTL OUTiA,
0x44 ANDi, L A LDrr, CPORT_MEM LDA(i),
0xbb ANDi, L ORr, CPORT_CTL OUTiA, CPORT_MEM LD(i)A,
;CODE
CODE _THB! HL POP, chkPS, ( B0 -> B7, B1 -> B3 )
L RR, RLA, RLA, RLA, RLA, L RR, RLA, RLA, RLA, RLA,
0x88 ANDi, L A LDrr, CPORT_CTL INAi,
0x77 ANDi, L ORr, CPORT_CTL OUTiA,
0x88 ANDi, L A LDrr, CPORT_MEM LDA(i),
0x77 ANDi, L ORr, CPORT_CTL OUTiA, CPORT_MEM LD(i)A,
;CODE
CODE _D1@ CPORT_D1 INAi, PUSHA, ;CODE
CODE _D2@ CPORT_D2 INAi, PUSHA, ;CODE

3
arch/z80/sms/xcomp.fs
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@ -9,10 +9,11 @@ SYSVARS 0x70 + CONSTANT VDP_MEM
0xbe CONSTANT VDP_DATAPORT
32 CONSTANT VDP_COLS
24 CONSTANT VDP_ROWS
SYSVARS 0x72 + CONSTANT PAD_MEM
SYSVARS 0x72 + CONSTANT CPORT_MEM
0x3f CONSTANT CPORT_CTL
0xdc CONSTANT CPORT_D1
0xdd CONSTANT CPORT_D2
SYSVARS 0x73 + CONSTANT PAD_MEM
5 LOAD ( z80 assembler )
: ZFILL, ( u ) 0 DO 0 A, LOOP ;
262 LOAD ( xcomp )

3
arch/z80/sms/xcompkbd.fs
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@ -10,10 +10,11 @@ SYSVARS 0x70 + CONSTANT VDP_MEM
0xbe CONSTANT VDP_DATAPORT
32 CONSTANT VDP_COLS
24 CONSTANT VDP_ROWS
SYSVARS 0x72 + CONSTANT PS2_MEM
SYSVARS 0x72 + CONSTANT CPORT_MEM
0x3f CONSTANT CPORT_CTL
0xdc CONSTANT CPORT_D1
0xdd CONSTANT CPORT_D2
SYSVARS 0x73 + CONSTANT PS2_MEM
5 LOAD ( z80 assembler )
: ZFILL, ( u ) 0 DO 0 A, LOOP ;
262 LOAD ( xcomp )

3
arch/z80/sms/xcompsdc.fs
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@ -11,10 +11,11 @@ SYSVARS 0x70 + CONSTANT VDP_MEM
0xbe CONSTANT VDP_DATAPORT
32 CONSTANT VDP_COLS
24 CONSTANT VDP_ROWS
SYSVARS 0x72 + CONSTANT PS2_MEM
SYSVARS 0x72 + CONSTANT CPORT_MEM
0x3f CONSTANT CPORT_CTL
0xdc CONSTANT CPORT_D1
0xdd CONSTANT CPORT_D2
SYSVARS 0x73 + CONSTANT PS2_MEM
5 LOAD ( z80 assembler )
: ZFILL, ( u ) 0 DO 0 A, LOOP ;
262 LOAD ( xcomp )

7
emul/z80/sms.c
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@ -76,11 +76,6 @@ static uint8_t iord_kbd()
return kbd_rd(&kbd);
}
static uint8_t iord_ports_ctl()
{
return ports_ctl_rd(&ports);
}
static void iowr_vdp_cmd(uint8_t val)
{
vdp_cmd_wr(&vdp, val);
@ -362,7 +357,7 @@ int main(int argc, char *argv[])
m->iord[VDP_DATA_PORT] = iord_vdp_data;
m->iord[PORTS_IO1_PORT] = iord_ports_io1;
m->iord[PORTS_IO2_PORT] = iord_ports_io2;
m->iord[PORTS_CTL_PORT] = iord_ports_ctl;
m->iord[PORTS_CTL_PORT] = iord_noop;
m->iowr[VDP_CMD_PORT] = iowr_vdp_cmd;
m->iowr[VDP_DATA_PORT] = iowr_vdp_data;
m->iowr[PORTS_CTL_PORT] = iowr_ports_ctl;

5
emul/z80/sms_ports.c
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@ -9,11 +9,6 @@ void ports_init(Ports *ports)
ports->THB = TRI_HIGHZ;
}
uint8_t ports_ctl_rd(Ports *ports)
{
return ports->ctl;
}
void ports_ctl_wr(Ports *ports, uint8_t val)
{
ports->ctl = val;

1
emul/z80/sms_ports.h
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@ -15,7 +15,6 @@ typedef struct {
} Ports;
void ports_init(Ports *ports);
uint8_t ports_ctl_rd(Ports *ports);
void ports_ctl_wr(Ports *ports, uint8_t val);
uint8_t ports_A_rd(Ports *ports);
uint8_t ports_B_rd(Ports *ports);