My psxkeys project [...] illustrates a device that has interfaces to mouse, keyboard and PSOne controller port using SX28.
There is also in there the startings of a SmartMedia card reader.
The mouse (clk0 dat0) and keyboard (clk1 dat1) use standard ibm ps2 connectors.
B0 clk0 B1 clk1 B2 dat0 B2 dat1 (mouse and keyboard share the dataline)
The psx controller connection is a 5 wire circuit, the timing is critical, (code is also availbe for 10mhz pic16f84 also)
A0 psx-dat A1 psx-cmd A2 psx-ack A3 psx-clk A4 psx-sel
For the sx-entry competitioon, hmm, i'd have to break open my prototype but I'm thinking it's on a parallax 50mhz crystal.
Ideally the circuit would run on 4 mhz cystal due to expense.
SmartMedia pins ----------------- B3 sm-ale B4 sm-cle B5 sm-write B6 sm-read B7 sm-busy ; psx connector ; ------------- ; 1 dat ; 2 cmd ; 3 7v ; 4 gnd ; 5 3v ; 6 sel ; 7 clk ; 8 NC ; 9 ack
The easiest way to test the circuit is with a mouse and standard playstation boot screen (nocd), the psx code can be tested separately and will cause a mouse cursor to appear on the memory card manager page of the Playstation.
A planned LAN connector will allow $100 PSOne to perform network operation in local home network including a beta internet suite from the designer.
ToDo ( contribs to simon@acid.co.nz ):
; psxkeys.src ; version for scenix sx28ac50 ; porta psx dedicated ; portb user port ; portc data bus ; 50mhzturbo=20x DEVICE SX28L,TURBO,STACKX_OPTIONX ID 'PSXKEYS' reset cold_start ; global port regs rb_dir equ $08 rb_dat equ $09 ra_dat equ $0a timer equ $0b timer2 equ $0c timer3 equ $0d ; watchdog waits wdreturn MACRO test timer snz retw $fc ENDM wdwaithi MACRO ;port,bit 100*256*9=230K=~1/160 sec mov timer,#100 clr timer2 :loop dec timer2 ;1 snz ;2 dec timer snz ;2 retw $fc sb \1 ;1 jmp :loop ;3 ENDM wdwaitlo MACRO ;port,bit mov timer,#100 clr timer2 :loop dec timer2 snz dec timer snz retw $fc snb \1 jmp :loop ENDM ; busy waits ifwne MACRO ;imm,label xor w,#\1 sz jmp \2 ENDM ifweq MACRO ;imm,label xor w,#\1 snz jmp \2 ENDM bin MACRO ;pin setb rb_dir.\1 mov !rb,rb_dir ENDM bout MACRO ;pin clrb rb_dir.\1 mov !rb,rb_dir ENDM bsethi MACRO setb rb_dat.\1 mov rb,rb_dat ENDM bsetlo MACRO clrb rb_dat.\1 mov rb,rb_dat ENDM ; ===================================================================== ; register set ; ===================================================================== org $10 pcount ds 1 padout ds 1 padin ds 1 parity ds 1 kout ds 1 kin ds 1 mout ds 1 min ds 1 count ds 1 dins ds 1 key ds 1 flags ds 1 mousex ds 1 mousey ds 1 mouseb ds 1 ; ===================================================================== ; object code starts here ; ===================================================================== org 0 ;port b clk0 equ 0 clk1 equ 1 dat0 equ 2 dat1 equ 2 ale equ 3 cle equ 4 write equ 5 read equ 6 busy equ 7 LEVEL equ $0d PULLUP equ $0e DIR equ $0f ; initialise user port default output=0 dir=input pullups=on cold_start clr ra mov w,#$60 mov rb_dat,w mov rb,w mode LEVEL mov !ra,#$0f ;TTL inputs mov !rb,#$ff ;TTL inputs mode PULLUP mov !ra,#$f0 mov !rb,#$f8 mode DIR mov !ra,#$0f ;port a=inputs mov w,#$84 ;dat,rb inputs mov rb_dir,w mov !rb,w clr dins ; call mediaid mainloop clr key clr flags ;reset data in pacmet dec flags clr mousex clr mousey call @readkeys call @readmouse call @padsend jmp @mainloop wait mov timer,w wa mov timer2,#12 wb decsz timer2 ;1 jmp wb ;3 decsz timer jmp wa retp ; ===================================================================== ; smartmedia driver ; ===================================================================== mediaid clr w mov !rc,w ;output bsethi cle bsetlo write mov rc,#$90 ;cmd=readid bsethi write bsetlo cle bsethi ale bsetlo write clr rc bsethi write bsetlo ale nop nop nop mov w,#$ff ;input mov !rc,w bsetlo read nop nop mov w,rc mov mousex,w bsethi read bsetlo read nop nop mov w,rc mov mousey,w bsethi read retp ; poke.h memf,0x0100 ; poke.b flashcmd,0x90 ;status ; poke.b flashloc,0x00 ; peek.b t0,flashdata ; peek.b t1,flashdata ; peek.b t2,flashdata ; brk ; ; ps/2 drivers for mouse and keyboard interface ; ;dins mouse equ 0 keyboard equ 1 ;flags mleft equ 2 mright equ 3 krelease equ 6 kextended equ 7 ; ===================================================================== ; keyboard driver (din0) ; ===================================================================== org $200 release MACRO bin \1 ENDM drive MACRO bout \1 ENDM ; write ps2 din0 kput mov kout,w ;paramater in w release dat0 ;release data drive clk0 ;drive clock mov w,#$64 call @wait ;wait 100 usecs drive dat0 ;drive data lo release clk0 ;release clock clr parity inc parity mov count,#8 kshift rr kout snc inc parity call kbitout wdreturn decsz count jmp kshift rr parity ;parity bit call kbitout wdreturn stc call kbitout wdreturn wdwaitlo rb.clk0 ;line control (must be 0) snb rb.dat0 retw $fc wdwaithi rb.clk0 jmp kget ;receive ack kbitout wdwaitlo rb.clk0 snc jmp kset drive dat0 wdwaithi rb.clk0 ret kset release dat0 wdwaithi rb.clk0 ret ; read ps2 din0 kget release clk0 release dat0 mov w,#$08 call @wait ;wait 100 usecs mov count,#$08 wdwaitlo rb.clk0 ;start bit wdwaithi rb.clk0 kbitin wdwaitlo rb.clk0 clc snb rb.dat0 stc rr kin wdwaithi rb.clk0 decsz count jmp kbitin wdwaitlo rb.clk0 ;parity check? wdwaithi rb.clk0 wdwaitlo rb.clk0 ;stop bit drive clk0 mov w,#$32 call @wait ;wait 100 usecs mov w,kin ret readkeys sb dins.keyboard jmp nokeyboard getkey call kget ifweq $fc,nokey mov w,kin ifwne $f0,notrelease clrb flags.krelease jmp getkey notrelease mov w,kin ifwne $e0,notextended clrb flags.kextended jmp getkey notextended mov w,kin mov key,w nokey drive clk0 ;inhibit release dat0 retp nokeyboard call kget ;poweron response ;start with reset? ifwne $aa,keyboarderr mov w,#$ed ;set leds call kput ifwne $fa,keyboarderr mov w,#$01 call kput ifwne $fa,keyboarderr setb dins.keyboard retp keyboarderr drive clk0 ;inhibit release dat0 ;release data clrb dins.keyboard retp ; ===================================================================== ; mouse driver (din1) ; ===================================================================== org $400 mput mov mout,w ;paramater in w release dat1 ;release data drive clk1 ;drive clock mov w,#$64 call @wait ;wait 100 usecs drive dat1 ;drive data lo release clk1 ;release clock clr parity inc parity mov count,#8 mshift rr mout snc inc parity call mbitout wdreturn decsz count jmp mshift rr parity ;parity bit call mbitout wdreturn stc call mbitout wdreturn wdwaitlo rb.clk1 ;line control (must be 0) snb rb.dat1 retw $fc wdwaithi rb.clk1 jmp mget ;receive ack mbitout wdwaitlo rb.clk1 snc jmp mset drive dat1 wdwaithi rb.clk1 ret mset release dat1 wdwaithi rb.clk1 ret ; read ps2 din1 mget release clk1 release dat1 mov w,#$08 call @wait ;wait 8 usecs mov count,#$08 wdwaitlo rb.clk1 ;start bit wdwaithi rb.clk1 mbitin wdwaitlo rb.clk1 clc snb rb.dat1 stc rr min wdwaithi rb.clk1 decsz count jmp mbitin wdwaitlo rb.clk1 ;parity check? wdwaithi rb.clk1 wdwaitlo rb.clk1 ;stop bit drive clk1 mov w,#$32 call @wait ;wait 50 usecs mov w,min ret readmouse sb dins.mouse jmp nomouse mov w,#$eb call mput ifwne $fa,mouseerr call mget mov mouseb,w call mget mov mousex,w call mget mov mousey,w snb mouseb.0 clrb flags.mright snb mouseb.1 clrb flags.mleft not mousey inc mousey retp nomouse call mget ;poweron response ifwne $aa,mouseerr call mget ifwne $00,mouseerr mov w,#$f0 ;set remote mode call mput ifwne $fa,mouseerr setb dins.mouse retp mouseerr drive clk1 ;inhibit release dat1 ;release data clrb dins.mouse retp ; ===================================================================== ; psx pad driver (port a) ; ===================================================================== org $600 dat equ 0 cmd equ 1 ack equ 2 clk equ 3 sel equ 4 ;rtcc waitsello MACRO :wlo snb rb.4 jmp :wlo ENDM waitselhi MACRO :whi sb rb.4 jmp :whi ENDM padsend ;waitselhi ;waitsello mov rtcc,#$ff mov !OPTION,#$ff nop wrc1 mov w,rtcc sz jmp wrc1 mov !ra,#$fe ;dat=output mov w,#$ff call dobyte decsz padin ;if padin!=01 ps0 jmp ps0 call doack mov w,#$12 call dobyte call doack mov w,#$5a call dobyte call doack mov w,key ;keys call dobyte call doack mov w,flags ;flags call dobyte call doack mov w,mousex ;deltax call dobyte call doack mov w,mousey ;deltay call dobyte ps0 clr ra mov !ra,#$ff ;float port ; waitselhi retp dobyte mov padout,w ;padout=w mov count,#8 mov w,#$80 ;w=1 dobit rr padout rl ra wl snb ra.clk ;wait clk lo jmp wl wh sb ra.clk ;wait clk hi jmp wh clc rr padin snb ra.cmd or padin,w decsz count jmp dobit ret doack mov count,#50 ;100/50mhz=2usecs db decsz count jmp db clr ra ;drive ack (ra.2) lo mov !ra,#$fa mov count,#25 ;100/50mhz=2usecs da decsz count jmp da mov !ra,#$fe ret
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