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Created vera.a02 and vera.h02

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Curtis F Kaylor 2019-09-23 19:57:03 -04:00
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; C02 module vera.h02 assembly language subroutines
; Requires External Functions NYBCAT, NYBCUT
; and Variables TEMP0
;getvid() - Get Video Output Mode
;Returns: A = Video Mode
; Y = Chroma Disabled
; X = Current Field
GETVID: LDA #$00 ;Set Register Offset to Video Output
JSR GETDCR ;Read from Display Composer
LDY #$00 ;Set Chroma Disabled to FALSE
LDX #$00 ;Set Video Field to EVEN
BIT GETVIM ;Test Chroma Disabled Bit
BEQ GETVIE ;If Bit 3 is Set
DEY ; Set Chroma Disabled to TRUE
BIT GETVIM ;Test Chroma Disabled Bit
GETVIE: BCC GETVIF ;If Bit 7 is Set
DEX ; Set Video Field to ODD
GETVIF: AND #$03 ;Isolate Bits 0-2 (Video Output Mode)
RTS
GETVIM: .DC $04 ;Chroma Disable Bit Mask
;getbdr() - Get Get Border Color
;Returns: A = Border Color Palette Index
GETBDR: LDA #$03 ;Set Register Offset to Border Color
;getdcr() - Get Display Composer Register
;Args: A = Register Offset
;Affects: Y
;Returns: A = Contents of Register
; X = Current Data Port
GETDCR: LDY #$00 ;Set MSB to Display Composer Page
TAX ;Set LSB to Register Offset
;and Execute GETREG
;getreg(addr);
;Args: Y,X = Address
;Returns: A = Mode
; X = Current Data Port
GETREG: LDA #$0F ;Set Bank to Registers
GETBYT: JSR SETADR ;Set Vera Address
LDX $9F25 ;Get Current Data Port
LDA $9F23,X ;Read LSB from Data Port
RTS
;getvsp() - Get Vertical Stop
;Destroys: TEMP0
;Affects: A
;Returns: Y,X = Vertical Stop
GETVSP: LDA #3 ;Set Lookup Index to Vertical Stop
.DC $2C ;Skip to GETHVS (BIT Absolute)
;getvsr() - Get Vertical Start
;Destroys: TEMP0
;Affects: A
;Returns: Y,X = Vertical Start
GETVSR: LDA #2 ;Set Lookup Index to Vertical Start
.DC $2C ;Skip to GETHVS (BIT Absolute)
;gethsp() - Get Horizontal Stop
;Destroys: TEMP0
;Affects: A
;Returns: Y,X = Horizontal Start
GETHSP: LDA #1 ;Set Lookup Index to Horizontal Start
.DC $2C ;Skip to GETHVS (BIT Absolute)
;gethsr() - Get Horizontal Start
;Destroys: TEMP0
;Affects: A
;Returns: Y,X = Horizontal Start
GETHSR: LDA #0 ;Set Lookup Index to Horizontal Start
GETHVS: LDY GETHVM,X ;Get High Bits Mask
STY TEMP0 ;and Save It
LDY GETHVO,X ;Get High Bits Rotation Count
.DC $5A ;PHY ;And Save it on Stack
ORA #4 ;Convert Index to Register Offset
JSR GETDCR ;Read LSB from Register
PHA ;and Save It
LDA #8 ;Load Register Offset for High Bits
STA $9F20 ;Set As Address LSB
LDA $9F23,X ;and Read High Byte from Data Port
AND TEMP0 ;and Isolate High Bits
.DC $FA ;PLX ;Restore LSB into X Register
.DC $7A ;PLY ;Restore Rotation Count into Y
BEQ GETHVY ;If Not Zero
GETHVR: LSR ;Shift Right One Bit
DEY ;Decrement Counter
BNE GETHVR ;and Loop if Not Zero
GETHVY: TYA ;Return MSB in Y Register
RTS
GETHVM: .DC $03,$C0,$10,$20
GETHVO: .DC 0,2,4,5
;getiql() - Get Interrupt Line
;Affects: A
;Returns: Y,X = Interrupt Line#
GETIQL: LDA #9 ;Set Register Offset to HSCALE,VSCALE
.DC $2C ;Skip to SETDCX (BIT Absolute)
;getscl() - Get Horizontal and Vertical Scale
;Returns: A,X = Horizontal Scale
; Y = Vertical Scale
GETSCL: LDA #1 ;Set Register Offset to HSCALE,VSCALE
;getdci() - Get Display Composer Register Pair
;Args: A = Register Offset
;Affects: Y
;Returns: A,X = Integer LSB
; Y = Integer LSB
GETDCI: LDY #$00 ;Set MSB to Display Composer Page
TAX ;Set LSB to Register Offset
;and Execute GETREG
;getrei(addr); Read Vera Register Pair
;Args: Y,X = Address
;Returns: A,X = Integer LSB
; Y = Integer LSB
GETREI: LDA #$0F ;Set Bank to Registers
;getint(addr); Read Integer from Vera Memory
;Args: A = Bank
; Y,X = Address
;Returns: A,X = Integer LSB
; Y = Integer LSB
GETINT: ORA #$10 ;Set Auto-Increment to 1
JSR SETADR ;Set Vera Address
LDX $9F25 ;Get Current Data Port
LDA $9F23,X ;Read LSB from Data Port
LDY $9F23,X ;Read MSB Data Port
TAX ;Copy LSB to X
RTS
;setvid() - Set Video Output Mode
;Args: A = Video Mode
; Y = Chroma Disabled
;Destroys: TEMP0
SETVID: AND #3 ;Isolate Video Mode Bits
CPY #0 ;Set Chroma Mask to
BEQ SETVIF ; 0 if Y is Zero or
LDY #4 ; 4 if it is not
SETVIF: STY TEMP0 ;Save Chroma Bit
ORA TEMP0 ;Combine with Video Mode Bits
LDX #0 ;Set Register Offset to Video Mode
BEQ SETDCX ;Write to Register
;setbdr() - Set Border Color
;Args: A = Border Color Palette Index
SETBDR: LDX #3 ;Set Register Offset to Border Color
.DC $2C ;Skip to SETDCX (BIT Absolute)
;setdcr() - Set Display Composer Register
;Args: A = Register Offset
; Y = Value to Write
;Affects: Y
;Returns: A = Value Written
; X = Current Data Port
SETDCR: TAX ;Set LSB to Register Offset
TYA ;Move Write Value to Accumulator
SETDCX: LDY #$00 ;Set MSB to Display Composer Page
;setreg(addr) - Set Register
;Args: A = Value to Write
; Y,X = Address
;Sets: TEMP0 = Value to Write
;Affects: Y
;Returns: A = Value Written
; X = Current Data Port
SETREG: STA TEMP0 ;Save Value to Write
SETREH: LDA #$0F ;Set Bank, Auto-Increment
;setbyt(addr) - Write Byte to Vera Memory
;Args: A = Bank
; Y,X = Address
;Uses: TEMP0 = Value to Write
;Affects: Y
;Returns: A = Value Written
; X = Current Data Port
SETBYT: JSR SETADR ;Set Vera Address
LDA TEMP0 ;Retrieve Value to Write
LDX $9F25 ;Get Current Data Port
STA $9F23,X ;Write Value to Data Port
RTS
;setiql() - Set IRQ Line
;Args: Y,X = IRQ Line Number`
;Sets: TEMP1,TEMP2 = IRQ Line Number
;Affecta: A,Y,X
SETIQL: TXA ;Copy LSB to Accumulator
LDX #9 ;Set Register Offset to HSCALE,VSCALE
.DC $2C ;Skip to SETDCP (BIT Absolute)
;setscl() - Set Horizontal and Vertical Scale
;Args: A = Horizontal Scale
; Y = Vertical Scale
SETSCL: LDX #1 ;Set Register Offset to HSCALE,VSCALE
;setdcp() - Set Display Composer Register Pair
;Args: A = First Register Value
; Y = Second Register Value
; X = Register Offset
;Affects: A,Y
;Returns: X = Current Data Port
SETDCP: STA TEMP1 ;Store First Value as LSB
STY TEMP2 ;Store Second Value as MSB
LDY #$00 ;Set MSB to Display Composer Page
;setrei(addr); Set Vera Register to Integer
;Args: Y,X = Address
;Uses: TEMP1,TEMP2 = Integer Value
;Affects: A,Y
;Returns: X = Current Data Port
SETREI: LDA #$0F ;Set Bank to Registers
;setint(addr); Write Integer to Vera Memory
;Args: A = Bank
; Y,X = Address
;Uses: TEMP1,TEMP2 = Integer Value
;Affects: A,Y
;Returns: X = Current Data Port
SETINT: ORA #$10 ;Set Auto-Increment to 1
JSR SETADR ;Set Vera Address
LDX $9F25 ;Get Current Data Port
LDA TEMP1 ;Get LSB
STA $9F23,X ;Write to Data Port
LDA TEMP2 ;Get MSB
STA $9F23,X ;Write to Data Port
RTS
;rgbclr(r,g,b) - Convert RGB Values to Palette Color
;Args: A = Red Value (0-15)
; Y = Green Value (0-15)
; X = Blue Value (0-15)
;Affects: A
;Returns: Y = Color MSB (0000RRRR)
; X = Color LSB (GGGGBBBB)
RGBCLR: PHA ;Save Red Value
TYA ;Copy Green Value to Left Nybble
.DC $DA ;PHX Copy Blue Value
.DC $7A ;PLY to Right Nybble
JSR NYBCAT ;Concatanate Green and Blue
TAX ;and Return as LSB
.DC $7A ;PLY Return Red as MSB
RTS
;clrrgb(c) - Convert Palette Color to RGB Values
;Args: Y = Color MSB (0000RRRR)
; X = Color LSB (GGGGBBBB)
;Returns: A = Red Value (0-15)
; Y = Green Value (0-15)
; X = Blue Value (0-15)
CLRRGB: .DC $5A ;PHY Save MSB
TXA ;Copy LSB into Accumulator
JSR NYBCUT ;and Split into Nybbles
.DC $5A ;PHY Return Blue Value
.DC $FA ;PLX in X Register
TAY ;Green Value in Y Register
PLA ;and Red Value in Accumulator
RTS
;getclr(idx) - Get Color Entry idx from Palette
;Args: A = Color Entry Index
;Affects: A
;Returns: Y = Color MSB (0000RRRR)
; X = Color LSB (GGGGBBBB)
GETCLR: JSR SETIDX ;Set Vera Address to Palette Index
LDX $9F25 ;Get Current Data Port
LDA $9F23,X ;Read LSB from Data Port
LDY $9F23,X ;Read MSB from Data Port
TAX ;Copy LSB to X Register
RTS
;setclr(idx) - Set Color Entry idx in Palette
;Args: A = Color Entry Index
; Y = Color MSB (0000RRRR)
; X = Color LSB (GGGGBBBB)
;Affects: A
;Returns: Y,X = Color Entry Address
SETCLR: JSR SAVRXY ;Save Color Value
JSR SETIDX ;Set Vera Address to Palette Index
LDX $9F25 ;Get Current Data Port
LDA TEMP1 ;Retrieve Color Value LSB
STA $9F23,X ;and Write to Data Port
LDA TEMP2 ;Retrieve Color Value MSB
STA $9F23,X ;Read MSB from Data Port
RTS
;setidx(idx) - Set Vera Address to Palette Index
;Args: A = Index
;Returns: A = Bank + Auto-Increment
; Y,X = Address
SETIDX: ASL ;Multiply Index by 2
TAX ;and Set as LSB
LDA #$10 ;Get Palette Page
ADC #$00 ;Add Carry from Multiply
TAY ;and Set as MSB
;regadr(opts,addr) - Set Vera Address to Internal Register
;Args: Y,X = Register Address
;Returns: A= Bank + Auto-Increment
REGADR: LDA #$1F ;Set Bank and Auto-Increment
;setadr(opts,addr) - Set Vera Address
;Args: A = Bank + Auto-Increment
; Y,X = Address
SETADR: STX $9F20 ;Store Address LSB
STY $9F21 ;Store Address MSB
STA $9F22 ;Store Bank & Auto-Increment
RTS

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/***************************************************
* vera.h02 - Commander X16 Routines for Vera chip *
***************************************************/
/* Convert Palette Color Value *
* to R, G, and B Values *
* Args: int c - Color Value *
* Returns: Red Value (0-15) *
* Green Value (0-15) *
* Blue Value (0-15) */
char clrrgb();
/* Read Color Value from Palette *
* Args: char i - Palette Index *
* Returns: int c - Color Value */
char getclr();
/* Read Display Controller Register *
* Args: char r - Register Offset *
* Returns: char v - Register Value */
char getdcr();
/* Read Video Output Mode *
* Returns: m - Output Mode *
* c - Chroma Disabled *
* f - Current Field */
char getvid();
/* Convert R, G, and B Values *
* to Palette Color Value *
* Args: r - Red Value (0-15) *
* g - Green Value (0-15) *
* b - Blue Value (0-15) *
* Returns: int c - Color Value */
char rgbclr();
/* Write Color Value to Palette *
* Args: i - Index into Palette *
* int c - Color Value *
* Returns: int d = Entry Address */
char setclr();

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/*****************************************************
* HELLO - Test/Demo program for C02 Standard Header *
* Prints "HELLO WORLD" and exits *
*****************************************************/
//Specify System Header using -H option
#include <stddef.h02>
#include <stdlib.h02>
#include <intlib.h02>
#include <stdio.h02>
#include <stdiox.h02>
#include <nybble.h02>
#include "include/vera.h02"
char hscale,vscale; //Video Scaling
char index; //Color Palette Index
char mode,mono,field; //Video Output Mode, Monochrome Flag, Current Field
char red,green,blue; //Color Components
char i,j,k,l;
int c,d,s;
int hstart,hstop; //Horizontal Start and Stop
int vstart,vstop; //Vertical Start and Stop
int irqlin; //IRQ Line#
char aa,xx,yy;
void passed() {
putln(" PASSED");
newlin();
}
void prtayx(aa,yy,xx) {prhex(aa); prhex(yy); prhex(xx); putspc(); putspc();}
void prthvs() {
setdst(hstart);printf("HSTART=%w, ");
setdst(hstop);printf("HSTOP=%w, ");
setdst(vstart);printf("VSTART=%w, ");
setdst(vstop);printf("VSTOP=%w%n");
}
void prttmp() {
printf(temp0, "TEMP0=$%h%n");
printf(temp1, "TEMP1=$%h%n");
printf(temp2, "TEMP2=$%h%n");
printf(temp3, "TEMP3=$%h%n");
}
void prtscl() {
printf(hscale, "HSCALE=%h, ");
printf(vscale, "VSCALE=%h%n");
}
void prtvid() {
select (mode) {
case 0: puts("DISABLED");
case 1: puts("VGA");
case 2: puts("NTSC");
case 3: puts("RGB");
default: puts("UNDEFINED");
}
if (mono) puts(" MONOCHROME"); else puts(" COLOR");
puts(", ");
if (field) puts("ODD"); else puts("EVEN");
putln(" FIELD");
}
void xerror() {
putln("ERROR ENCOUNTERED");
goto exit;
}
main:
newlin();
putln("TESTING GETVID() AND SETVID()");
for (i=0;i<4;i++) {
for (j=1;j:+;j--) {
//inline $ff;
setvid(i,j);
mode,mono,field = getvid();
//prtvid();
if (mode<>i or mono&j<>j) xerror();
}
}
passed();
putln("TESTING GETBDR() AND SETBDR()");
i = 0;
do {
setbdr(i);
index = getbdr();
if (index<>i) xerror();
//printf(index, "BORDER=%h%n");
i++;
} while(i);
passed();
putln("TESTING GETSCL() AND SETSCL()");
i=1;
do {
j=1;
do {
setscl(i,j);
hscale,vscale = getscl();
//prtscl();
if (hscale<>i or vscale<>j) xerror("ERROR IN GETSCL()/SETSCL()");
j<<;
} while (j);
i<<;
} while (i);
passed();
putln("TESTING GETHST(), GETHSP()");
hstart = gethsr();
hstop = gethsp();
vstart = getvsr();
vstop = getvsp();
prthvs();
newlin();
putln("TESTING GETIRL() AND SETIRL()");
for (i=0;i<2;i++) {
j=0;
do {
setiql(0,i,j);
irqlin = getiql();
//setdst(); printf("IRQ LINE=%w%n");
if (>irqlin<>i or <irqlin<>j) xerror();
j++;
} while (j);
}
passed();
putln("TESTING RGBCLR() AND CLRRGB()");
for (red=0;red<16;red++) {
for (green=0;green<16;green++) {
for (blue=0;blue<16;blue++) {
//prtayx(red,green,blue);
c = rgbclr(red,green,blue);
//putwrd(c); putspc();
i,j,k = clrrgb();
//prtayx(i,j,k);
if (i<>red or j<>green or blue<>k) xerror();
}
}
//if (anykey()==#ESCKEY) goto exit;
}
passed();
putln("TESTING GETCLR()");
for (i=16; i<32; i++) {
//puthex(i); putspc();
c = getclr(i);
//putwrd(c); putspc();
if (i&15<>>c or nybdup(i)<><c) xerror();
//if (i&7==7) newlin();
}
passed();
putln("TESTING SETCLR()");
for (i=128; i<144; i++) {
//puthex(i); putspc();
red = i+8&15;
green = 144-i;
blue = i&15;
//prhex(red); prhex(green); prhex(blue); putspc(); putspc();
c = rgbclr(red,green,blue);
setclr(i,c);
d = getclr(i);
//putwrd(d); putspc();
if (<d<><c or >d<>>c) xerror();
//if (i&7==7) newlin();
}
passed();
goto exit;