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Dallas.s
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Dallas.s
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;--------------------------------------------------------------
; dallas1.s
; Dallas Phantom Time Chip (ROM configuration)
;
; DS1216E, DS1216F
; DS1315 in ROM mode
;
;
; Thanks to Troed of SYNC for example DS1216 code
;
;--------------------------------------------------------------
;
; This file is distributed under the GPL v2 or at your
; option any later version. See LICENSE.TXT for details.
;
; (c) Anders Granlund, 2020
;
;--------------------------------------------------------------
DEV_BASE_ADDR EQU $00000000 ; autodetect
DEV_WRITE_ADDR EQU $00000001 ; A1 --> D
DEV_READ_ADDR EQU $0000000C ; A2 or A3 --> /CE
DEV_NVRAM_SIZE EQU $00000000 ;
DEV_CONF4 EQU $00000000 ;
DEV_CONF5 EQU $00000000 ;
DEV_CONF6 EQU $00000005 ; autodetect delay
DEV_CONF7 EQU $00000000 ; last found addr
CONF_DETECT_DELAY EQU 6*4
CONF_PREF_ADDR EQU 7*4
include "Core.s"
DI MACRO
move.w sr,-(sp)
ori.w #$700,sr
ENDM
EI MACRO
move.w (sp)+,sr
ENDM
section data
dsAutoDetectPref:
dc.l $0
dsAutoDetectAddr:
dc.l $00FB0000, $00FB0001 ; Cartridge ROM3
dc.l $00FA0000, $00FA0001 ; Cartridge ROM4
dc.l $00E00000, $00E00001 ; TOS2 Lo/Hi-0
dc.l $00FC0000, $00FC0001 ; TOS1 Lo/Hi-0
dc.l $00FD0000, $00FD0001 ; TOS1 Lo/Hi-1
dc.l $00FE0000, $00FE0001 ; TOS1 Lo/Hi-2
dc.l 0
section bss
gBusError ds.l 1
gReadAddr ds.l 1
gWriteAddr ds.l 1
gDataPin ds.l 1
section text
;--------------------------------------------------------------
devInit: ; a0 = config, d0 = return status
;--------------------------------------------------------------
move.l (a0),a0
bsr dsDetect ; detect chip
cmp.l #0,d0
bne .found
moveq.l #0,d0
.found rts
;--------------------------------------------------------------
devGetTime: ; d0 = return
;--------------------------------------------------------------
DI
bsr dsOpen
bsr dsReadRegs
EI
moveq #0,d7 ; year
rol.l #4,d1
move.l d1,d2
and.l #$F,d2
mulu.w #10,d2
rol.l #4,d1
move.l d1,d3
and.l #$F,d3
add.l d2,d3
and.l #$7F,d3
ror.l #7,d3
or.l d3,d7
rol.l #4,d1 ; month
move.l d1,d2
and.l #1,d2
mulu.w #10,d2
rol.l #4,d1
move.l d1,d3
and.l #$F,d3
add.l d2,d3
and.l #$F,d3
ror.l #8,d3
ror.l #3,d3
or.l d3,d7
rol.l #4,d1 ; day
move.l d1,d2
and.l #3,d2
mulu.w #10,d2
rol.l #4,d1
move.l d1,d3
and.l #$F,d3
add.l d2,d3
and.l #$1F,d3
swap d3
or.l d3,d7
rol.l #4,d0 ; hour
move.l d0,d2
and.l #3,d2
mulu.w #10,d2
rol.l #4,d0
move.l d0,d3
and.l #$F,d3
add.l d2,d3
and.l #$1F,d3
lsl.l #8,d3
lsl.l #3,d3
or.l d3,d7
rol.l #4,d0 ; minute
move.l d0,d2
and.l #7,d2
mulu.w #10,d2
rol.l #4,d0
move.l d0,d3
and.l #$F,d3
add.l d2,d3
and.l #$3F,d3
lsl.l #5,d3
or.l d3,d7
rol.l #4,d0 ; second/2
move.l d0,d2
and.l #7,d2
mulu.w #10,d2
rol.l #4,d0
move.l d0,d3
and.l #$F,d3
add.l d2,d3
lsr.l #1,d3
and.l #$1F,d3
or.l d3,d7
move.l d7,d0
rts
;--------------------------------------------------------------
devSetTime: ; d0 = input
;--------------------------------------------------------------
moveq #0,d7
move.l d0,d1 ; seconds
and.l #$1F,d1
lsl.l #1,d1
divu.w #10,d1
swap d1
move.l d1,d2
and.l #$F,d1
or.l d1,d7
ror.l #4,d7
swap d2
and.l #$7,d2
or.l d2,d7
ror.l #4,d7
lsr.l #5,d0
move.l d0,d1 ; minutes
and.l #$3F,d1
divu #10,d1
swap d1
move.l d1,d2
and.l #$F,d1
or.l d1,d7
ror.l #4,d7
swap d2
and #$7,d2
or.l d2,d7
ror.l #4,d7
lsr.l #6,d0
move.l d0,d1 ; hours
and.l #$1F,d1
divu.w #10,d1
swap d1
move.l d1,d2
and.l #$F,d1
or.l d1,d7
ror.l #4,d7
swap d2
and.l #$3,d2
or.l d2,d7
ror.l #4,d7
and.l #$FFFFFF00,d7
lsr.l #5,d0
move.l d7,d6
moveq #0,d7
move.l #$11,d1 ; day + ctrl
or.l d1,d7
ror.l #8,d7
move.l d0,d1 ; date
and.l #$1F,d1
divu.w #10,d1
swap d1
move.l d1,d2
and.l #$F,d1
or.l d1,d7
ror.l #4,d7
swap d2
and.l #$3,d2
or.l d2,d7
ror.l #4,d7
lsr.l #5,d0
move.l d0,d1 ; month
and.l #$F,d1
divu.w #10,d1
swap d1
move.l d1,d2
and.l #$F,d1
or.l d1,d7
ror.l #4,d7
swap d2
and.l #$1,d2
or.l d2,d7
ror.l #4,d7
lsr.l #4,d0
move.l d0,d1 ; year
and.l #$7F,d1
divu.w #10,d1
swap d1
move.l d1,d2
and.l #$F,d1
or.l d1,d7
ror.l #4,d7
swap d2
and.l #$F,d2
or.l d2,d7
ror.l #4,d7
lsr.l #5,d0
move.l d6,d0
move.l d7,d1
DI
bsr dsOpen
bsr dsWriteRegs
EI
rts
;--------------------------------------------------------------
devReadNVram: ; a0 = buffer, d0 = start, d1 = length
;--------------------------------------------------------------
DI
EI
rts
;--------------------------------------------------------------
devWriteNVram: ; a0 = buffer, d0 = start, d1 = length
;--------------------------------------------------------------
DI
EI
rts
;--------------------------------------------------------------
dsSetAddr: ; d0 = base addr
;--------------------------------------------------------------
movem.l d0-d1,-(sp)
move.l d0,gWriteAddr
or.l config+8,d0
move.l d0,gReadAddr
move.l config+4,d0
move.l d0,gDataPin
movem.l (sp)+,d0-d1
rts
;--------------------------------------------------------------
dsDetect: ; d0 = base address in/out
;--------------------------------------------------------------
cmp.l #0,d0
beq dsAutoDetect
bsr dsCheckDevice
bne .found
bsr dsInitDevice
bsr dsCheckDevice
bne .found
moveq #0,d0
rts
.found move.l gWriteAddr,d0
rts
dsAutoDetect:
move.l config+CONF_PREF_ADDR,d0
movea.l #dsAutoDetectPref,a1
move.l d0,(a1)
cmp.l #0,d0
bne .l1
add.l #4,a1
.l1 move.l (a1)+,d0
cmp.l #0,d0
beq .l2
bsr dsCheckDevice
bne .l7
bra .l1
.l2 movea.l #dsAutoDetectAddr,a1 ; found nothing
.l3 move.l (a1)+,d0 ; it may be switched off so
cmp.l #0,d0 ; reinitialize and try again
beq .l4
bsr dsInitDevice
bra .l3
.l4 movea.l #dsAutoDetectAddr,a1 ; again now
.l5 move.l (a1)+,d0
cmp.l #0,d0
beq .l6
bsr dsCheckDevice
bne .l7
bra .l5
.l6 moveq #0,d0
rts
.l7 move.l -(a1),d0
move.l dsAutoDetectPref,d1
cmp.l d0,d1
bne dsUpdateAutoDetectPref
rts
dsUpdateAutoDetectPref:
move.l d0,-(sp)
move.l d0,dsAutoDetectPref
move.l d0,config+CONF_PREF_ADDR
bsr saveConfig
move.l (sp)+,d0
rts
dsCheckDevice:
move.l sp,a6
move.l $8,gBusError
move.l #.except,$8
bsr dsSetAddr
DI
bsr dsOpen
bsr dsReadRegs
EI
move.l d0,d2
move.l $4ba,d1
add.l config+CONF_DETECT_DELAY,d1
.l1 move.l $4ba,d0
cmp.l d0,d1
bhi .l1
DI
bsr dsOpen
bsr dsReadRegs
EI
.done cmp.l d0,d2
rts
.except move.l a6,sp
moveq #0,d0
moveq #0,d1
move.l gBusError,$8
bra .done
dsInitDevice:
DI
bsr dsSetAddr
bsr dsOpen
move.l #$00000000,d0
move.l #$01010111,d1
bsr dsWriteRegs
EI
rts
;--------------------------------------------------------------
dsOpen:
;--------------------------------------------------------------
movem.l d0-d1,-(sp)
bsr dsReadRegs ; flush open transmissions
move.l #$5CA33AC5,d0 ; write magic to reopen
move.l d0,d1
bsr dsWriteRegs
movem.l (sp)+,d0-d1
rts
;--------------------------------------------------------------
dsReadRegs: ; d1=7-4, d0=3-0
;--------------------------------------------------------------
movem.l d2-d3/a0,-(sp)
movea.l (gReadAddr),a0 ; a0 = read address
moveq #0,d0
moveq #0,d1
moveq #63,d2 ; d2 = bit counter
.l1 move.b (a0),d3 ; d3 = temp data
roxr.b #1,d3
roxr.l #1,d1
roxr.l #1,d0
dbf d2,.l1
movem.l (sp)+,d2-d3/a0
rts
;--------------------------------------------------------------
dsWriteRegs: ; d1=7-4, d0=3-0
;--------------------------------------------------------------
movem.l d0-d5/a0,-(sp)
movea.l (gWriteAddr),a0 ; a0 = write address
move.l gDataPin,d2 ; d2 = data pin
moveq #31,d5 ; d5 = bit counter
.l1 move.w d0,d3 ; d3 = temp data
ror.l #1,d0
and.w #1,d3 ; bit to write
lsl.w d2,d3 ; shift into position
move.b (a0,d3),d4 ; read to write
dbf d5,.l1
moveq #31,d5 ; d5 = bit counter
.l2 move.w d1,d3
ror.l #1,d1
and.w #1,d3 ; bit to write
lsl.w d2,d3 ; shift into position
move.b (a0,d3),d4 ; read to write
dbf d5,.l2
movem.l (sp)+,d0-d5/a0
rts