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672 lines
14 KiB
672 lines
14 KiB
;
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;==================================================================================================
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; DSKY NEXT GENERATION PKD (DISPLAY AND KEYBOARD) ROUTINES
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;==================================================================================================
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;
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; A PKD CAN SHARE A PPI BUS WITH EITHER A PPIDE OR PPISD.
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; SEE PPI_BUS.TXT FOR MORE INFORMATION.
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;
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; LED SEGMENTS (BIT VALUES)
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;
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; +--01--+
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; 20 02
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; +--40--+
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; 10 04
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; +--08--+ 80
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;
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; KEY CODE MAP (KEY CODES) CSCCCRRR
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; ||||||||
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; |||||+++-- ROW
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; ||+++----- COL
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; |+-------- SHIFT
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; +--------- CONTROL
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;
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; 00 08 10 18 23
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; 01 09 11 19 22
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; 02 0A 12 1A 21
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; 03 0B 13 1B 20
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; 04 0C 14 1C SHIFT
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; 05 0D 15 1D CTRL
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;
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; LED BIT MAP (BIT VALUES)
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;
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; $08 $09 $0A $0B $0C $0D $0E $0F
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; --- --- --- --- --- --- --- ---
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; 01 01 01 01 01
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; 02 02 02 02 02
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; 04 04 04 04 04
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; 08 08 08 08 08
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; 10 10 10 10 10
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; 20 20 20 20 20 L1 L2 BUZZ
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;
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PKD_PPIA .EQU PKDPPIBASE + 0 ; PORT A
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PKD_PPIB .EQU PKDPPIBASE + 1 ; PORT B
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PKD_PPIC .EQU PKDPPIBASE + 2 ; PORT C
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PKD_PPIX .EQU PKDPPIBASE + 3 ; PPI CONTROL PORT
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;
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PKD_PPIX_RD: .EQU %10010010 ; PPIX VALUE FOR READS
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PKD_PPIX_WR: .EQU %10000010 ; PPIX VALUE FOR WRITES
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;
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; PIO CHANNEL C:
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;
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; 7 6 5 4 3 2 1 0
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; RES 0 0 CS CS /RD /WR A0
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;
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; SETTING BITS 3 & 4 WILL ASSERT /CS ON 3279
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; CLEAR BITS 1 OR 2 TO ASSERT READ/WRITE
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;
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PKD_PPI_IDLE .EQU %00000110
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;
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PKD_CMD_CLR .EQU %11011111 ; CLEAR (ALL OFF)
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PKD_CMD_CLRX .EQU %11010011 ; CLEAR (ALL ON)
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PKD_CMD_WDSP .EQU %10010000 ; WRITE DISPLAY RAM
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PKD_CMD_RDSP .EQU %01110000 ; READ DISPLAY RAM
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PKD_CMD_CLK .EQU %00100000 ; SET CLK PRESCALE
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PKD_CMD_FIFO .EQU %01000000 ; READ FIFO
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;
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PKD_PRESCL .EQU PKDOSC/100000 ; PRESCALER
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;
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;__PKD_PREINIT_______________________________________________________________________________________
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;
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; CONFIGURE PARALLEL PORT AND INITIALIZE 8279
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;____________________________________________________________________________________________________
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;
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;
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; HARDWARE RESET 8279 BY PULSING RESET LINE
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;
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PKD_PREINIT:
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LD A,(DSKY_DISPACT) ; DSKY DISPATCHER ALREADY SET?
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OR A ; SET FLAGS
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RET NZ ; IF ALREADY ACTIVE, ABORT
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;
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; CHECK FOR PPI
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CALL PKD_PPIDETECT ; TEST FOR PPI HARDWARE
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RET NZ ; BAIL OUT IF NOT THERE
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;
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; SETUP PPI TO IDLE STATE
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CALL PKD_PPIIDLE
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LD A,PKD_PPI_IDLE
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OUT (PKD_PPIC),A
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;
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; PULSE RESET SIGNAL ON 8279
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SET 7,A
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OUT (PKD_PPIC),A
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RES 7,A
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OUT (PKD_PPIC),A
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;
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; INITIALIZE 8279
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CALL PKD_REINIT
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;
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; NOW SEE IF A PKD IS REALLY THERE...
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LD A,$71
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LD C,0
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CALL PKD_PUTBYTE
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LD C,0
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CALL PKD_GETBYTE
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CP $71
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RET NZ ; BAIL OUT IF MISCOMPARE
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;
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; RECORD HARDWARE PRESENT
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LD A,$FF
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LD (PKD_PRESENT),A
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;
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; REGISTER DRIVER WITH HBIOS
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LD BC,PKD_DISPATCH
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CALL DSKY_SETDISP
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;
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RET
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;
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PKD_REINIT:
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CALL PKD_PPIIDLE
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; SET CLOCK SCALER TO 20
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LD A,PKD_CMD_CLK | PKD_PRESCL
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CALL PKD_CMD
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JP PKD_RESET
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;
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;__PKD_INIT__________________________________________________________________________________________
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;
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; DISPLAY DSKY INFO
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;____________________________________________________________________________________________________
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;
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PKD_INIT:
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CALL NEWLINE ; FORMATTING
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PRTS("PKD:$") ; FORMATTING
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;
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PRTS(" IO=0x$") ; FORMATTING
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LD A,PKDPPIBASE ; GET BASE PORT
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CALL PRTHEXBYTE ; PRINT BASE PORT
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;
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LD A,(PKD_PRESENT) ; PRESENT?
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OR A ; SET FLAGS
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RET NZ ; YES, ALL DONE
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PRTS(" NOT PRESENT$") ; NOT PRESENT
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RET ; DONE
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;
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; DSKY DEVICE FUNCTION DISPATCH ENTRY
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; A: RESULT (OUT), 0=OK, Z=OK, NZ=ERR
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; B: FUNCTION (IN)
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;
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PKD_DISPATCH:
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LD A,B ; GET REQUESTED FUNCTION
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AND $0F ; ISOLATE SUB-FUNCTION
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JP Z,PKD_RESET ; RESET DSKY HARDWARE
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DEC A
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JP Z,PKD_STAT ; GET KEYPAD STATUS
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DEC A
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JP Z,PKD_GETKEY ; READ A KEY FROM THE KEYPAD
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DEC A
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JP Z,PKD_SHOWHEX ; DISPLAY A 32-BIT BINARY VALUE IN HEX
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DEC A
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JP Z,PKD_SHOWSEG ; DISPLAY SEGMENTS
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DEC A
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JP Z,PKD_KEYLEDS ; SET KEYPAD LEDS
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DEC A
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JP Z,PKD_STATLED ; SET STATUS LED
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DEC A
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JP Z,PKD_BEEP ; BEEP DSKY SPEAKER
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DEC A
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JP Z,PKD_DEVICE ; DEVICE INFO
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SYSCHKERR(ERR_NOFUNC)
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RET
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;
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; RESET DSKY -- CLEAR RAM AND FIFO
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;
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PKD_RESET:
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LD A,PKD_CMD_CLR
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CALL PKD_CMD
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;
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; 8259 TAKES ~160US TO CLEAR RAM DURING WHICH TIME WRITES TO
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; DISPLAY RAM ARE INHIBITED. HIGH BIT OF STATUS BYTE IS SET
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; DURING THIS WINDOW. TO PREVENT A DEADLOCK, A LOOP COUNTER
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; IS USED TO IMPLEMENT A TIMEOUT.
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LD B,0 ; TIMEOUT LOOP COUNTER
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PKD_RESET1:
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PUSH BC ; SAVE COUNTER
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CALL PKD_ST ; GET STATUS BYTE
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POP BC ; RECOVER COUNTER
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BIT 7,A ; BIT 7 IS DISPLAY RAM BUSY
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JR Z,PKD_RESET2 ; MOVE ON IF DONE
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DJNZ PKD_RESET1 ; LOOP TILL TIMEOUT
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;
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PKD_RESET2:
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RET
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;
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; CHECK FOR KEY PRESS, SAVE RAW VALUE, RETURN STATUS
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;
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PKD_STAT:
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LD A,(PKD_PRESENT) ; DOES IT EXIST?
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OR A ; SET FLAGS
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RET Z ; ABORT WITH A=0 IF NOT THERE
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CALL PKD_ST
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AND $0F ; ISOLATE THE CUR FIFO LEN
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RET
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;
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; WAIT FOR A DSKY KEYPRESS AND RETURN
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;
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PKD_GETKEY:
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LD A,(PKD_PRESENT) ; DOES IT EXIST?
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OR A ; SET FLAGS
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JR Z,PKD_GETKEY1A ; ABORT IF NOT PRESENT
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CALL PKD_STAT
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JR Z,PKD_GETKEY ; LOOP IF NOTHING THERE
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LD A,PKD_CMD_FIFO
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CALL PKD_CMD
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CALL PKD_DIN
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XOR %11000000 ; FLIP POLARITY OF SHIFT/CTL BITS
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PUSH AF ; SAVE VALUE
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AND $3F ; STRIP SHIFT/CTL BITS FOR LOOKUP
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LD B,28 ; SIZE OF DECODE TABLE
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LD C,0 ; INDEX
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LD HL,PKD_KEYMAP ; POINT TO BEGINNING OF TABLE
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PKD_GETKEY1:
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CP (HL) ; MATCH?
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JR Z,PKD_GETKEY2 ; FOUND, DONE
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INC HL
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INC C ; BUMP INDEX
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DJNZ PKD_GETKEY1 ; LOOP UNTIL EOT
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POP AF ; FIX STACK
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PKD_GETKEY1A:
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LD A,$FF ; NOT FOUND ERR, RETURN $FF
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RET
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PKD_GETKEY2:
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; RETURN THE INDEX POSITION WHERE THE SCAN CODE WAS FOUND
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; THE ORIGINAL SHIFT/CTRL BITS ARE RESTORED
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POP AF ; RESTORE RAW VALUE
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AND %11000000 ; ISOLATE SHIFT/CTRL BITS
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OR C ; COMBINE WITH INDEX VALUE
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LD E,A ; PUT IN E FOR RETURN
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XOR A ; SIGNAL SUCCESS
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RET
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;
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; DISPLAY HEX VALUE FROM DE:HL
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;
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PKD_SHOWHEX:
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LD BC,DSKY_HEXBUF ; POINT TO HEX BUFFER
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CALL ST32 ; STORE 32-BIT BINARY THERE
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LD HL,DSKY_HEXBUF ; FROM: BINARY VALUE (HL)
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LD DE,DSKY_BUF ; TO: SEGMENT BUFFER (DE)
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CALL DSKY_BIN2SEG ; CONVERT
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LD HL,DSKY_BUF ; POINT TO SEGMENT BUFFER
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; AND FALL THRU TO DISPLAY IT
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;
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;
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;
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PKD_SHOWSEG:
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LD C,0 ; STARTING DISPLAY POSITION
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LD B,DSKY_BUFLEN ; NUMBER OF CHARS
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CALL PKD_PUTSTR ; DO IT
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XOR A ; SIGNAL SUCCESS
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RET
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;
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;
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;
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PKD_KEYLEDS:
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CALL PKD_PUTLED ; DO IT
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XOR A ; SIGNAL SUCCESS
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RET
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;
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;
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;
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PKD_STATLED:
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LD A,$0D ; PORT FOR FIRST LED
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ADD A,D ; ADD LED NUM
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LD C,A ; PUT IN C
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LD A,E ; LED STATE INDICATOR
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OR A ; SET FLAGS
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JR NZ,PKD_STATLED1 ; HANDLE "ON"
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;
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; TURN LED OFF
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PUSH BC ; SAVE LED NUM
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CALL PKD_GETBYTE ; GET CUR VALUE
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AND ~$20 ; BIT 5 OFF
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JR PKD_STATLED2 ; FINISH UP
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;
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PKD_STATLED1:
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; TURN LED ON
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PUSH BC ; SAVE LED NUM
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CALL PKD_GETBYTE ; GET CUR VALUE
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OR $20 ; BIT 5 ON
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;
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PKD_STATLED2:
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POP BC ; RECOVER LED NUM
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CALL PKD_PUTBYTE ; PUT NEW VALUE
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XOR A ; SIGNAL SUCCESS
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RET
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;
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; BEEP THE SPEAKER ON THE PKD
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;
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PKD_BEEP:
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PUSH BC
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LD C,$0F
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CALL PKD_GETBYTE
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OR $20
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LD C,$0F
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CALL PKD_PUTBYTE
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;
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; TIMER
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PUSH HL
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LD hl,$8FFF
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PKD_BEEP1:
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DEC HL
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LD A,H
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CP 0
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JR NZ,PKD_BEEP1
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POP HL
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LD C,$0F
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CALL PKD_GETBYTE
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AND $DF
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LD C,$0F
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CALL PKD_PUTBYTE
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POP BC
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XOR A ; SIGNAL SUCCESS
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RET
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;
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; DEVICE INFORMATION
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;
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PKD_DEVICE:
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LD D,DSKYDEV_PKD ; D := DEVICE TYPE
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LD E,0 ; E := PHYSICAL DEVICE NUMBER
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LD H,0 ; H := MODE
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LD L,PKDPPIBASE ; L := BASE I/O ADDRESS
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XOR A ; SIGNAL SUCCESS
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RET
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;
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;__PKD_PPIDETECT_____________________________________________________________________________________
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;
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; PROBE FOR PPI HARDWARE
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;____________________________________________________________________________________________________
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;
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PKD_PPIDETECT:
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;
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; TEST FOR PPI EXISTENCE
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; WE SETUP THE PPI TO WRITE, THEN WRITE A VALUE OF ZERO
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; TO PORT A (DATALO), THEN READ IT BACK. IF THE PPI IS THERE
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; THEN THE BUS HOLD CIRCUITRY WILL READ BACK THE ZERO. SINCE
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; WE ARE IN WRITE MODE, AN IDE CONTROLLER WILL NOT BE ABLE TO
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; INTERFERE WITH THE VALUE BEING READ.
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CALL PKD_PPIWR
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;
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LD C,PKD_PPIA ; PPI PORT A
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XOR A ; VALUE ZERO
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OUT (C),A ; PUSH VALUE TO PORT
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IN A,(C) ; GET PORT VALUE
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OR A ; SET FLAGS
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RET ; AND RETURN
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;
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;_KEYMAP_TABLE_____________________________________________________________________________________________________________
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;
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PKD_KEYMAP:
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; POS $00 $01 $02 $03 $04 $05 $06 $07
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; KEY [0] [1] [2] [3] [4] [5] [6] [7]
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.DB $0D, $04, $0C, $14, $03, $0B, $13, $02
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;
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; POS $08 $09 $0A $0B $0C $0D $0E $0F
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; KEY [8] [9] [A] [B] [C] [D] [E] [F]
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.DB $0A, $12, $01, $09, $11, $00, $08, $10
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;
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; POS $10 $11 $12 $13 $14 $15 $16 $17
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; KEY [FW] [BK] [CL] [EN] [DE] [EX] [GO] [BO]
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.DB $05, $15, $1D, $1C, $1B, $1A, $19, $18
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; POS $18 $19 $1A $1B
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; KEY [F4] [F3] [F2] [F1]
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.DB $23, $22, $21, $20
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;
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;==================================================================================================
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; PKD OUTPUT ROUTINES
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;==================================================================================================
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;
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; SEND DSKY COMMAND BYTE IN REGISTER A
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; TRASHES BC
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;
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PKD_CMD:
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LD B,$01
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JR PKD_DOUT2
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;
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; SEND DSKY DATA BYTE IN REGISTER A
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; TRASHES BC
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;
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PKD_DOUT:
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LD B,$00
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;
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PKD_DOUT2:
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;
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; SAVE INCOMING DATA BYTE
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PUSH AF
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;
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; SET PPI LINE CONFIG TO WRITE MODE
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CALL PKD_PPIWR
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;
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; SETUP
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LD C,PKD_PPIC
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;
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; SET ADDRESS FIRST
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LD A,PKD_PPI_IDLE
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OR B
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OUT (C),A
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;
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; ASSERT 8279 /CS
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SET 3,A
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SET 4,A
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OUT (C),A
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;
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; PPIC WORKING VALUE TO REG B NOW
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LD B,A
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;
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; ASSERT DATA BYTE VALUE
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POP AF
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OUT (PKD_PPIA),A
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;
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; PULSE /WR
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RES 1,B
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OUT (C),B
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NOP ; MAY NOT BE NEEDED
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SET 1,B
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OUT (C),B
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;
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; DEASSERT /CS
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RES 3,B
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RES 4,B
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OUT (C),B
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;
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; CLEAR ADDRESS BIT
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RES 0,B
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OUT (C),B
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;
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; DONE
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CALL PKD_PPIIDLE
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RET
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;
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;==================================================================================================
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; PKD INPUT ROUTINES
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;==================================================================================================
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;
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; RETURN DSKY STATUS VALUE IN A
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; TRASHES BC
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;
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PKD_ST:
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LD B,$01
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JR PKD_DIN2
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;
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; RETURN NEXT DATA VALUE IN A
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; TRASHES BC
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;
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PKD_DIN:
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LD B,$00
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;
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PKD_DIN2:
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; SET PPI LINE CONFIG TO READ MODE
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CALL PKD_PPIRD
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;
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; SETUP
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LD C,PKD_PPIC
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;
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; SET ADDRESS FIRST
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LD A,PKD_PPI_IDLE
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OR B
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OUT (C),A
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;
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; ASSERT 8279 /CS
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SET 3,A
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SET 4,A
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OUT (C),A
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;
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; PPIC WORKING VALUE TO REG B NOW
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LD B,A
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;
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; ASSERT /RD
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RES 2,B
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OUT (C),B
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;
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; GET VALUE
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IN A,(PKD_PPIA)
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;
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; DEASSERT /RD
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SET 2,B
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OUT (C),B
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;
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; DEASSERT /CS
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RES 3,B
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RES 4,B
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OUT (C),B
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;
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; CLEAR ADDRESS BIT
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RES 0,B
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OUT (C),B
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;
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; DONE
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CALL PKD_PPIIDLE
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RET
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;
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;==================================================================================================
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; PKD UTILITY ROUTINES
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;==================================================================================================
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;
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; BLANK PKD DISPLAY (WITHOUT USING CLEAR)
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;
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PKD_BLANK:
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LD A,PKD_CMD_WDSP
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CALL PKD_CMD
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LD B,16
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PKD_BLANK1:
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PUSH BC
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LD A,$FF
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CALL PKD_DOUT
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POP BC
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DJNZ PKD_BLANK1
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RET
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;
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; WRITE A RAW BYTE VALUE TO DSKY DISPLAY RAM
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; AT LOCATION IN REGISTER C, VALUE IN A.
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;
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PKD_PUTBYTE:
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PUSH BC
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PUSH AF
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LD A,C
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ADD A,PKD_CMD_WDSP
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CALL PKD_CMD
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POP AF
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XOR $FF
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CALL PKD_DOUT
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POP BC
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RET
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;
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; READ A RAW BYTE VALUE FROM DSKY DISPLAY RAM
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; AT LOCATION IN REGISTER C, VALUE RETURNED IN A
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|
;
|
|
PKD_GETBYTE:
|
|
PUSH BC
|
|
LD A,C
|
|
ADD A,PKD_CMD_RDSP
|
|
CALL PKD_CMD
|
|
CALL PKD_DIN
|
|
XOR $FF
|
|
POP BC
|
|
RET
|
|
;
|
|
; WRITE A STRING OF RAW BYTE VALUES TO DSKY DISPLAY RAM
|
|
; AT LOCATION IN REGISTER C, LENGTH IN B, ADDRESS IN HL.
|
|
;
|
|
PKD_PUTSTR:
|
|
PUSH BC
|
|
LD A,C
|
|
ADD A,PKD_CMD_WDSP
|
|
CALL PKD_CMD
|
|
POP BC
|
|
;
|
|
PKD_PUTSTR1:
|
|
LD A,(HL)
|
|
XOR $FF
|
|
INC HL
|
|
PUSH BC
|
|
CALL PKD_DOUT
|
|
POP BC
|
|
DJNZ PKD_PUTSTR1
|
|
RET
|
|
;
|
|
; READ A STRING OF RAW BYTE VALUES FROM DSKY DISPLAY RAM
|
|
; AT LOCATION IN REGISTER C, LENGTH IN B, ADDRESS IN HL.
|
|
;
|
|
PKD_GETSTR:
|
|
PUSH BC
|
|
LD A,C
|
|
ADD A,PKD_CMD_RDSP
|
|
CALL PKD_CMD
|
|
POP BC
|
|
;
|
|
PKD_GETSTR1:
|
|
PUSH BC
|
|
CALL PKD_DIN
|
|
POP BC
|
|
XOR $FF
|
|
LD (HL),A
|
|
INC HL
|
|
DJNZ PKD_GETSTR1
|
|
RET
|
|
;
|
|
; UPDATE THE KEYPAD KEY LEDS. HL POINTS TO AN 8 BYTE BITMAP BUFFER
|
|
; THAT DEFINES ALL KEYPAD LED VALUES. THE ENTIRE MATRIX IS UPDATED.
|
|
;
|
|
PKD_PUTLED:
|
|
PUSH AF
|
|
PUSH BC
|
|
LD C,8
|
|
PKD_PUTLED_1:
|
|
LD A,(HL)
|
|
PUSH BC
|
|
CALL PKD_PUTBYTE
|
|
POP BC
|
|
INC C
|
|
INC HL
|
|
LD A,C
|
|
CP $10
|
|
JP NZ,PKD_PUTLED_1
|
|
POP BC
|
|
POP AF
|
|
RET
|
|
;
|
|
;==================================================================================================
|
|
; PKD LINE CONTROL ROUTINES
|
|
;==================================================================================================
|
|
;
|
|
; SETUP PPI FOR WRITING: PUT PPI PORT A IN OUTPUT MODE
|
|
; AVOID REWRTING PPIX IF ALREADY IN OUTPUT MODE
|
|
;
|
|
PKD_PPIWR:
|
|
PUSH AF
|
|
;
|
|
; CHECK FOR WRITE MODE
|
|
LD A,(PKD_PPIX_VAL)
|
|
CP PKD_PPIX_WR
|
|
JR Z,PKD_PPIWR1
|
|
;
|
|
; SET PPI TO WRITE MODE
|
|
LD A,PKD_PPIX_WR
|
|
OUT (PKD_PPIX),A
|
|
LD (PKD_PPIX_VAL),A
|
|
;
|
|
; RESTORE PORT C (MAY NOT BE NEEDED)
|
|
LD A,PKD_PPI_IDLE
|
|
OUT (PKD_PPIC),A
|
|
;
|
|
PKD_PPIWR1:
|
|
;
|
|
POP AF
|
|
RET
|
|
;
|
|
; SETUP PPI FOR READING: PUT PPI PORT A IN INPUT MODE
|
|
; AVOID REWRTING PPIX IF ALREADY IN INPUT MODE
|
|
;
|
|
PKD_PPIRD:
|
|
PUSH AF
|
|
;
|
|
; CHECK FOR READ MODE
|
|
LD A,(PKD_PPIX_VAL)
|
|
CP PKD_PPIX_RD
|
|
JR Z,PKD_PPIRD1
|
|
;
|
|
; SET PPI TO READ MODE
|
|
LD A,PKD_PPIX_RD
|
|
OUT (PKD_PPIX),A
|
|
LD (PKD_PPIX_VAL),A
|
|
;
|
|
PKD_PPIRD1:
|
|
POP AF
|
|
RET
|
|
;
|
|
; RELEASE USE OF PPI
|
|
;
|
|
PKD_PPIIDLE:
|
|
JR PKD_PPIRD ; SAME AS READ MODE
|
|
;
|
|
;==================================================================================================
|
|
; UTILTITY FUNCTIONS
|
|
;==================================================================================================
|
|
;
|
|
;
|
|
;==================================================================================================
|
|
; STORAGE
|
|
;==================================================================================================
|
|
;
|
|
PKD_PPIX_VAL .DB 0 ; PPIX SHADOW REG
|
|
PKD_PRESENT .DB 0 ; HARDWARE PRESENT FLAG
|
|
|