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@ -39,6 +39,13 @@ SIO1_VEC .EQU VEC(INT_SIO1) |
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; |
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#ENDIF |
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; |
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#IF (SIO0MODE == SIOMODE_STD) |
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SIO0A_CMD .EQU SIO0BASE + $01 |
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SIO0A_DAT .EQU SIO0BASE + $00 |
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SIO0B_CMD .EQU SIO0BASE + $03 |
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SIO0B_DAT .EQU SIO0BASE + $02 |
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#ENDIF |
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; |
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#IF (SIO0MODE == SIOMODE_RC) |
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SIO0A_CMD .EQU SIO0BASE + $00 |
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SIO0A_DAT .EQU SIO0BASE + $01 |
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@ -60,15 +67,15 @@ SIO0B_CMD .EQU SIO0BASE + $07 |
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SIO0B_DAT .EQU SIO0BASE + $05 |
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#ENDIF |
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; |
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#IF (SIO0MODE == SIOMODE_EZZ80) |
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SIO0A_CMD .EQU SIO0BASE + $01 |
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SIO0A_DAT .EQU SIO0BASE + $00 |
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SIO0B_CMD .EQU SIO0BASE + $03 |
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SIO0B_DAT .EQU SIO0BASE + $02 |
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#ENDIF |
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; |
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#IF (SIOCNT >= 2) |
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; |
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#IF (SIO1MODE == SIOMODE_STD) |
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SIO1A_CMD .EQU SIO1BASE + $01 |
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SIO1A_DAT .EQU SIO1BASE + $00 |
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SIO1B_CMD .EQU SIO1BASE + $03 |
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SIO1B_DAT .EQU SIO1BASE + $02 |
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#ENDIF |
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; |
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#IF (SIO1MODE == SIOMODE_RC) |
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SIO1A_CMD .EQU SIO1BASE + $00 |
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SIO1A_DAT .EQU SIO1BASE + $01 |
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@ -90,13 +97,6 @@ SIO1B_CMD .EQU SIO1BASE + $07 |
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SIO1B_DAT .EQU SIO1BASE + $05 |
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#ENDIF |
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; |
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#IF (SIO1MODE == SIOMODE_EZZ80) |
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SIO1A_CMD .EQU SIO1BASE + $01 |
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SIO1A_DAT .EQU SIO1BASE + $00 |
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SIO1B_CMD .EQU SIO1BASE + $03 |
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SIO1B_DAT .EQU SIO1BASE + $02 |
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#ENDIF |
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; |
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#ENDIF |
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; |
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SIO_PREINIT: |
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@ -158,44 +158,6 @@ SIO_PREINIT2: |
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; |
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#ENDIF |
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; |
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; FOR NOW, THIS IS SPECIFICALLY FOR A CTC TO DRIVE AN SIO |
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; AT 1:1 USING CTC CHANNELS A & B. IN OTHER WORDS, IT JUST |
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; PASSES THE INCOMING TRIGGER OUT AT 1:1. |
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; |
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#IF (SIOCNT >= 1) |
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#IF (SIO0CTCC >= 0) |
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LD A,%01010111 ; CTCC CONTROL WORD VALUE |
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; |||||||+-- 1=CONTROL WORD FLAG |
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; ||||||+--- 1=SOFTWARE RESET |
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; |||||+---- 1=TIME CONSTANT FOLLOWS |
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; ||||+----- 0=AUTO TRIGGER WHEN TIME CONST LOADED |
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; |||+------ 1=RISING EDGE TRIGGER |
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; ||+------- 0=PRESCALER OF 16 (NOT USED) |
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; |+-------- 1=COUNTER MODE |
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; +--------- 0=NO INTERRUPTS |
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OUT (CTCA + SIO0CTCC),A ; SETUP CTCC |
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LD A,1 ; CTC TIMER CONSTANT = 1 |
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OUT (CTCA + SIO0CTCC),A ; SETUP CTC TIMER CONSTANT |
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#ENDIF |
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#ENDIF |
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; |
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#IF (SIOCNT >= 2) |
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#IF (SIO1CTCC >= 0) |
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LD A,%01010111 ; CTCC CONTROL WORD VALUE |
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; |||||||+-- 1=CONTROL WORD FLAG |
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; ||||||+--- 1=SOFTWARE RESET |
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; |||||+---- 1=TIME CONSTANT FOLLOWS |
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; ||||+----- 0=AUTO TRIGGER WHEN TIME CONST LOADED |
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; |||+------ 1=RISING EDGE TRIGGER |
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; ||+------- 0=PRESCALER OF 16 (NOT USED) |
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; |+-------- 1=COUNTER MODE |
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; +--------- 0=NO INTERRUPTS |
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OUT (CTCA + SIO1CTCC),A ; SETUP CTCC |
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LD A,1 ; CTC TIMER CONSTANT = 1 |
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OUT (CTCA + SIO1CTCC),A ; SETUP CTC TIMER CONSTANT |
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#ENDIF |
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#ENDIF |
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; |
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SIO_PREINIT3: |
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XOR A ; SIGNAL SUCCESS |
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RET ; AND RETURN |
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@ -538,72 +500,195 @@ SIO_INITDEV1: |
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CALL PRTHEXWORD |
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#ENDIF |
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; |
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LD A,E ; GET CONFIG LSB |
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AND $E0 ; CHECK FOR DTR, XON, PARITY=MARK/SPACE |
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JR NZ,SIO_INITFAIL ; IF ANY BIT SET, FAIL, NOT SUPPORTED |
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PUSH DE ; SAVE TARGET CONFIG |
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; |
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; WE WANT TO DETERMINE A DIVISOR FOR THE SIO CLOCK |
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; THAT RESULTS IN THE DESIRED BAUD RATE. |
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; BAUD RATE = SIO CLK / DIVISOR, OR TO SOLVE FOR DIVISOR |
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; DIVISOR = SIO CLK / BAUDRATE. |
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; TAKE ADVANTAGE OF ENCODED BAUD RATES ALWAYS BEING A FACTOR OF 75. |
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; SO, WE CAN USE (SIO OSC / 75) / (BAUDRATE / 75) |
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; |
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; GET SERIAL CLOCK VALUE AND DIVIDE IT BY 75 |
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PUSH IY ; GET CONFIG TABLE ENTRY PTR |
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POP HL ; MOVE TO HL |
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LD A,9 ; OFFSET TO CLK VALUE |
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CALL ADDHLA ; HL IS NOW PTR TO 32 BIT CLK |
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CALL LD32 ; LOAD DE:HL W/ RAW CLK VAL |
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LD C,75 ; DIVIDE BY 75 LIKE BAUD RATE |
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CALL DIV32X8 ; HL NOW HAS (CLK / 75) |
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; |
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#IF (SIODEBUG) |
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PRTS(" CLK75=$") |
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CALL PRTHEX32 |
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#ENDIF |
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; |
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; SCALE DOWN THE 32 BIT VALUE TO FIT IN 16 BITS KEEPING |
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; TRACK OF THE NUMBER OF BITS SHIFTED OUT IN B |
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LD B,0 |
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SIO_INITDEV1A: |
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LD A,D |
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OR E |
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JR Z,SIO_INITDEV1B |
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SRL D |
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RR E |
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RR H |
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RR L |
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INC B |
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JR SIO_INITDEV1A |
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SIO_INITDEV1B: |
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; |
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#IF (SIODEBUG) |
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PRTS(" CLK=$") |
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CALL PRTHEX32 |
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#ENDIF |
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; |
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POP DE ; RECOVER INCOMING TARGET CFG |
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PUSH DE ; RESAVE IT |
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PUSH HL ; SAVE CLK VALUE |
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PUSH BC ; SAVE BITS SHIFTED |
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; NOW DECODE THE BAUDRATE, BUT WE USE A CONSTANT OF 1 INSTEAD |
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; OF THE NORMAL 75. THIS PRODUCES (BAUDRATE / 75). |
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LD A,D ; GET CONFIG MSB |
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AND $1F ; ISOLATE ENCODED BAUD RATE |
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LD L,A ; PUT IN L |
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LD H,0 ; H IS ALWAYS ZERO |
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LD DE,1 ; USE 1 FOR ENCODING CONSTANT |
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CALL DECODE ; DE:HL := BAUD RATE, ERRORS IGNORED |
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; |
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#IF (SIODEBUG) |
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PRTS(" BAUD75=$") |
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CALL PRTHEX32 |
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#ENDIF |
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; |
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; SCALE DOWN CLK BY SAME AMOUNT AS BAUD RATE |
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POP BC ; RESTORE BITS TO SHIFT |
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LD A,B |
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OR A |
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JR Z,SIO_INITDEV1D |
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SIO_INITDEV1C: |
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SRL D |
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RR E |
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RR H |
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RR L |
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DJNZ SIO_INITDEV1C |
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SIO_INITDEV1D: |
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; |
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#IF (SIODEBUG) |
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PRTS(" BAUD=$") |
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CALL PRTHEX32 |
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#ENDIF |
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; |
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POP DE ; RECOVER CLOCK |
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EX DE,HL ; SWAP CLOCK & BAUD FOR DIV |
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; *** HANDLE DIVIDE BY ZERO??? *** |
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CALL DIV16 ; BC := HL/DE == TARGET DIVISOR |
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; |
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#IF (SIODEBUG) |
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PRTS(" ENC=$") |
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#IF (SIODEBUG) |
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PRTS(" DIV=$") |
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CALL PRTHEXWORD |
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#ENDIF |
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; |
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; NOW THAT WE HAVE THE TARGET BAUD RATE DIVISOR, WE WILL |
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; ATTEMPT TO IMPLEMENT IT. THE SIO ITSELF CAN APPLY |
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; A DIVISOR OF 1, 16, 32, OR 64. IF A CTC CHANNEL IS |
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; CONFIGURED FOR THIS SERIAL PORT, THEN WE CAN ADDITIONALLY |
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; APPLY A SCALER OF 1-256. |
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; |
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; WE START BY DETERMINING THE MAXIMUM POSSIBLE SIO |
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; SCALING. |
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; |
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; WARNING: IF THE INCOMING SIO CLOCK IS THE SAME AS THE |
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; CPU CLOCK AND WE USE THE 1:1 DIVISOR, THE SIO WILL NOT |
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; WORK WELL. |
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; |
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PUSH BC ; MOVE WORKING DIVISOR VALUE |
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POP HL ; ... TO HL |
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LD A,L ; LOAD LSB OF DIVISOR |
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LD BC,$0004 ; SHIFT 0 BITS / SIO WR4 DIV 1 |
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LD A,L ; LOAD LSB OF DIVISOR |
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AND %00001111 ; DIV 16 POSSIBLE? |
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JR NZ,SIO_INITDEV2 ; NOPE, DONE TRYING |
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LD BC,$0444 ; SHIFT 4 BITS / SIO WR4 DIV 16 |
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LD A,L ; LOAD LSB OF DIVISOR |
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AND %00011111 ; DIV 32 POSSIBLE? |
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JR NZ,SIO_INITDEV2 ; NOPE, DONE TRYING |
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LD BC,$0584 ; SHIFT 5 BITS / SIO WR4 DIV 32 |
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LD A,L ; LOAD LSB OF DIVISOR |
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AND %00111111 ; DIV 32 POSSIBLE? |
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JR NZ,SIO_INITDEV2 ; NOPE, DONE TRYING |
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LD BC,$06C4 ; SHIFT 6 BITS / SIO WR4 DIV 64 |
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; |
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; NOW APPLY THE SIO DIVISOR TO THE WORKING DIVISOR |
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; AND SAVE THE RESULTANT SIO REGISTER VALUE TO APPLY LATER. |
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SIO_INITDEV2: |
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; SHIFT BITS |
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XOR A ; ZERO ACCUM |
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OR B ; ZERO BITS TO SHIFT? |
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JR Z,SIO_INITDEV4 ; BYPASS SHIFTING IF SO |
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SIO_INITDEV3: |
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RR H ; SHIFT HL RIGHT BY |
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RR L ; ONE BIT |
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DJNZ SIO_INITDEV3 ; UNTIL ALL BITS DONE |
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SIO_INITDEV4: |
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LD B,C ; MOVE SIO WR4 VALUE TO B |
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; |
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POP DE ; RESTORE DE = SERIAL CONFIG |
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; |
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#IF (SIODEBUG) |
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PUSH BC |
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PUSH HL |
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POP BC |
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PRTS(" CTCDIV=$") |
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CALL PRTHEXWORD |
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POP BC |
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#ENDIF |
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; |
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#IF (CTCENABLE) |
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LD A,(IY+13) ; GET CTC CHANNEL |
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INC A ; $FF -> 0 |
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JR Z,SIO_NOCTC ; NO CTC CHANNEL, BYPASS |
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; |
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; HL HAS THE DIVISOR THAT WE WANT TO PROGRAM INTO THE |
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; DESIGNATED CTC CHANNEL. HOWEVER, THE CTC REGISTER IS ONE |
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; BYTE. A VALUE OF 0 MEANS 256. SO WE NEED TO VALIDATE |
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; THAT HL IS BETWEEN 1 AND 256. |
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DEC HL ; 1-256 -> 0-255 |
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LD A,H ; MSB NOW MUST BE ZERO |
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OR A ; SET FLAGS |
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JR NZ,SIO_INITFAIL ; IF ANY BIT SET, FAIL |
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INC HL ; RESTORE HL |
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; |
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; ALL GOOD. PROGRAM THE CTC CHANNEL |
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LD A,(IY+13) ; GET CTC CHANNEL |
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ADD A,CTCA ; ADD TO CTC BASE PORT ADR |
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#IF (SIODEBUG) |
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PRTS(" CTC=$") |
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CALL PRTHEXBYTE |
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#ENDIF |
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LD C,A ; AND PUT IN C FOR I/O |
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LD A,%01010111 ; CTCC CONTROL WORD VALUE |
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; |||||||+-- 1=CONTROL WORD FLAG |
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; ||||||+--- 1=SOFTWARE RESET |
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; |||||+---- 1=TIME CONSTANT FOLLOWS |
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; ||||+----- 0=AUTO TRIGGER WHEN TIME CONST LOADED |
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; |||+------ 1=RISING EDGE TRIGGER |
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; ||+------- 0=PRESCALER OF 16 (NOT USED) |
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; |+-------- 1=COUNTER MODE |
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; +--------- 0=NO INTERRUPTS |
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OUT (C),A ; PREP CTC CHANNEL |
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OUT (C),L ; SET CTC TIMER CONSTANT |
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JR SIO_INITBROK ; AND REJOIN MAIN SETUP |
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; |
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#ENDIF |
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; |
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PUSH DE ; SAVE REQUESTED CONFIG |
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LD L,(IY+9) ; LOAD CLK FREQ |
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LD H,(IY+10) ; ... INTO DE:HL |
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LD E,(IY+11) ; ... " |
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LD D,(IY+12) ; ... " |
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LD C,75 ; BAUD RATE ENCODING CONSTANT |
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CALL ENCODE ; C = TEST BAUD RATE (ENCODED) = BAUDTST |
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POP DE ; GET REQ CONFIG BACK, D = BAUDREQ |
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; |
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; BIT 4 (DIV 3) OF BAUDREQ AND BAUDTST MUST MATCH! |
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LD A,C ; A = BAUDTST |
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XOR D ; XOR WITH BAUDREQ |
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BIT 4,A ; DO BIT 4 VALS MATCH? |
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JR NZ,SIO_INITFAIL ; IF NOT, BAIL OUT |
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; |
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LD A,C ; BAUDTST TO A |
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AND $0F ; ISOLATE DIV 2 BAUD BITS |
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LD C,A ; C = BAUDTST |
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; |
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LD A,D ; MSB W/ BAUD RATE TO A |
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AND $0F ; ISOLATE DIV 2 BAUD BITS |
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LD L,A ; L = BAUDREQ |
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; |
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; PUSH AF ; *DEBUG* |
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; CALL NEWLINE ; *DEBUG* |
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; LD A,L ; *DEBUG* |
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; CALL PRTHEXBYTE ; *DEBUG* |
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; LD A,C ; *DEBUG* |
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; CALL PRTHEXBYTE ; *DEBUG* |
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; CALL NEWLINE ; *DEBUG* |
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; POP AF ; *DEBUG* |
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; |
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LD A,C ; A = BAUDTST |
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LD B,$04 ; SIO R4 VAL FOR DIV 1 |
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CP L ; BAUDTST = BAUDREQ? |
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JR Z,SIO_INITBROK ; IF MATCH, WE ARE DONE |
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; |
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SUB 4 ; DIVIDE BY 16 (NOW DIV 16 TOT) |
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JR C,SIO_INITFAIL ; FAIL IF UNDERFLOW |
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LD B,$44 ; SIO R4 VAL FOR DIV 16 |
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CP L ; BAUDTST = BAUDREQ? |
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JR Z,SIO_INITBROK ; IF MATCH, WE ARE DONE |
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; |
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SUB 1 ; DIVIDE BY 2 (NOW DIV 32 TOT) |
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JR C,SIO_INITFAIL ; FAIL IF UNDERFLOW |
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LD B,$84 ; SIO R4 VAL FOR DIV 32 |
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CP L ; BAUDTST = BAUDREQ? |
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JR Z,SIO_INITBROK ; IF MATCH, WE ARE DONE |
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; |
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SUB 1 ; DIVIDE BY 2 (NOW DIV 64 TOT) |
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JR C,SIO_INITFAIL ; FAIL IF UNDERFLOW |
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LD B,$C4 ; SIO R4 VAL FOR DIV 64 |
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CP L ; BAUDTST = BAUDREQ? |
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JR Z,SIO_INITBROK ; IF MATCH, WE ARE DONE |
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SIO_NOCTC: |
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; IF THERE IS NO CTC, THEN THE REMAINING DIVISOR |
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; NEEDS TO BE EXACTLY 1 OR WE HAVE A PROBLEM. |
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LD A,L ; GET REMAINING DIVISOR |
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DEC A ; 1 -> 0 |
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JR Z,SIO_INITBROK ; FAIL IF NOT 1 |
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; |
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SIO_INITFAIL: |
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; |
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@ -665,6 +750,28 @@ SIO_INITBROK: |
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; FAILS. |
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; |
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SIO_INITSAFE: |
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; |
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#IF (CTCENABLE) |
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; |
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; CHECK IF A CTC CHANNEL IS CONFIGURED |
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LD A,(IY+13) ; GET CTC CHANNEL |
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INC A ; $FF -> 0 |
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JR Z,SIO_INITSAFE2 ; NO CTC CHANNEL, BYPASS |
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; |
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; IF A CTC CHANNEL IS CONFIGURED, PROGRAM IT FOR |
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; SIMPLE 1:1 SCALING. |
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LD A,(IY+13) ; GET CTC CHANNEL |
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ADD A,CTCA ; ADD TO CTC BASE PORT ADR |
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LD C,A ; AND PUT IN C FOR I/O |
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LD A,%01010111 ; CTCC CONTROL WORD VALUE |
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OUT (C),A ; PREP CTC CHANNEL |
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LD A,1 ; TIMER CONSTANT IS 1 |
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OUT (C),A ; SET CTC TIMER CONSTANT |
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; |
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#ENDIF |
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; |
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SIO_INITSAFE2: |
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; SETUP DEFAULT VALUES FOR SIO REGISTERS |
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LD HL,SIO_INITDEFS |
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LD DE,SIO_INITVALS |
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LD BC,SIO_INITLEN |
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@ -764,7 +871,8 @@ SIO_INITLEN .EQU $ - SIO_INITVALS |
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; |
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SIO_INITDEFS: |
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.DB $00, $18 ; WR0: CHANNEL RESET CMD |
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.DB $04, $C4 ; WR4: CLK BAUD PARITY STOP BIT |
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;.DB $04, $C4 ; WR4: CLK BAUD PARITY STOP BIT |
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.DB $04, $44 ; WR4: CLK BAUD PARITY STOP BIT |
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.DB $01, SIO_WR1VAL ; WR1: INTERRUPT STYLE |
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.DB $02, $00 ; WR2: IM2 VEC OFFSET |
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.DB $03, $E1 ; WR3: 8 BIT RCV, CTS/DCD AUTO, RX ENABLE |
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@ -984,8 +1092,9 @@ SIO0A_CFG: |
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.DB SIO0A_DAT ; DATA PORT |
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.DW SIO0ACFG ; LINE CONFIGURATION |
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.DW SIO0A_RCVBUF ; POINTER TO RCV BUFFER STRUCT |
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.DW (SIO0ACLK / SIO0ADIV) & $FFFF ; CLOCK FREQ AS |
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.DW (SIO0ACLK / SIO0ADIV) >> 16 ; ... DWORD VALUE |
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.DW SIO0ACLK & $FFFF ; CLOCK FREQ AS |
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.DW SIO0ACLK >> 16 ; ... DWORD VALUE |
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.DB SIO0ACTCC ; CTC CHANNEL |
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; |
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SIO_CFGSIZ .EQU $ - SIO_CFG ; SIZE OF ONE CFG TABLE ENTRY |
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; |
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@ -998,8 +1107,9 @@ SIO0B_CFG: |
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.DB SIO0B_DAT ; DATA PORT |
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.DW SIO0BCFG ; LINE CONFIGURATION |
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.DW SIO0B_RCVBUF ; POINTER TO RCV BUFFER STRUCT |
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.DW (SIO0BCLK / SIO0BDIV) & $FFFF ; CLOCK FREQ AS |
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.DW (SIO0BCLK / SIO0BDIV) >> 16 ; ... DWORD VALUE |
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.DW SIO0BCLK & $FFFF ; CLOCK FREQ AS |
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.DW SIO0BCLK >> 16 ; ... DWORD VALUE |
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.DB SIO0BCTCC ; CTC CHANNEL |
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; |
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#IF (SIOCNT >= 2) |
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; |
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@ -1012,8 +1122,9 @@ SIO1A_CFG: |
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.DB SIO1A_DAT ; DATA PORT |
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.DW SIO1ACFG ; LINE CONFIGURATION |
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.DW SIO1A_RCVBUF ; POINTER TO RCV BUFFER STRUCT |
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.DW (SIO1ACLK / SIO1ADIV) & $FFFF ; CLOCK FREQ AS |
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.DW (SIO1ACLK / SIO1ADIV) >> 16 ; ... DWORD VALUE |
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.DW SIO1ACLK & $FFFF ; CLOCK FREQ AS |
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.DW SIO1ACLK >> 16 ; ... DWORD VALUE |
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.DB SIO1ACTCC ; CTC CHANNEL |
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; |
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; SIO1 CHANNEL B |
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SIO1B_CFG: |
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@ -1024,8 +1135,9 @@ SIO1B_CFG: |
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.DB SIO1B_DAT ; DATA PORT |
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.DW SIO1BCFG ; LINE CONFIGURATION |
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.DW SIO1B_RCVBUF ; POINTER TO RCV BUFFER STRUCT |
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.DW (SIO1BCLK / SIO1BDIV) & $FFFF ; CLOCK FREQ AS |
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.DW (SIO1BCLK / SIO1BDIV) >> 16 ; ... DWORD VALUE |
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.DW SIO1BCLK & $FFFF ; CLOCK FREQ AS |
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.DW SIO1BCLK >> 16 ; ... DWORD VALUE |
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.DB SIO1BCTCC ; CTC CHANNEL |
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; |
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#ENDIF |
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; |
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Wayne Warthen
6 years ago