6502/6502-QR-code-generator
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6502-QR-code-generator/QRCodeGen.inc
thrust26 eefc158261 added level Q and H support
2021-04-11 21:07:28 +02:00

731 lines
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PHP
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;===============================================================================
; Q R C O D E C O N S T A N T S
;===============================================================================
IF QR_VERSION = 1 ;{
QR_SIZE = 21 ; 21x21 QR code
QR_CAPACITY = 26
IF QR_LEVEL = 0
QR_DEGREE = 7 ; for version 1, level L QR codes
ENDIF
IF QR_LEVEL = 1
QR_DEGREE = 10 ; for version 1, level M QR codes
ENDIF
IF QR_LEVEL = 2
QR_DEGREE = 13 ; for version 1, level Q QR codes
ENDIF
IF QR_LEVEL = 3
QR_DEGREE = 17 ; for version 1, level H QR codes
ENDIF
ENDIF ;}
IF QR_VERSION = 2
QR_SIZE = 25 ; 25x25 QR code
QR_CAPACITY = 44
IF QR_LEVEL = 0
QR_DEGREE = 10 ; for version 2, level L QR codes
ENDIF
IF QR_LEVEL = 1
QR_DEGREE = 16 ; for version 2, level M QR codes
ENDIF
IF QR_LEVEL = 2
QR_DEGREE = 22 ; for version 2, level Q QR codes
ENDIF
IF QR_LEVEL = 3
QR_DEGREE = 28 ; for version 2, level H QR codes
ENDIF
ENDIF
IF QR_VERSION = 3 ;{
QR_SIZE = 29 ; 29x29 QR code
QR_CAPACITY = 70
IF QR_LEVEL = 0
QR_DEGREE = 15 ; for version 3, level L QR codes
ENDIF
IF QR_LEVEL = 1
QR_DEGREE = 26 ; for version 3, level M QR codes
ENDIF
IF QR_LEVEL = 2 || QR_LEVEL = 3
ECHO ""
ECHO "ERROR: Version 3, Level", [QR_LEVEL]d, "not supported"
ERR
ENDIF
ENDIF ;}
QR_MAX_DATA = QR_CAPACITY - QR_DEGREE
QR_MODE = %0100 ; byte mode
QR_POLY = $11d ; GF(2^8) is based on 9 bit polynomial
; x^8 + x^4 + x^3 + x^2 + 1 = 0x11d
QR_FORMATS = 15 ; 15 type information bits
QR_MAX_MSG = QR_MAX_DATA - 2
QR_TOTAL = QR_MAX_DATA + QR_DEGREE ; 44
;===============================================================================
; Q R C O D E M A C R O S
;===============================================================================
; The following code has been partially converted from the C code of the
; QR code generator found at https://github.com/nayuki/QR-Code-generator
;-----------------------------------------------------------
MAC _RS_REMAINDER
;-----------------------------------------------------------
.i = tmpVars+2
.factor = tmpVars+3
; memset(result, 0, 16); // done in START_TEXT
; for (int i = dataLen-1; i >= 0; i--) { // Polynomial division
ldx #QR_MAX_DATA-1
.loopI
stx .i
; uint8_t factor = data[i] ^ result[degree - 1];
lda msgData,x
eor remainder + QR_DEGREE - 1
sta .factor
; memmove(&result[1], &result[0], (size_t)(16 - 1) * sizeof(result[0]));
ldx #QR_DEGREE-1
.loopMove
lda remainder-1,x
sta remainder,x
dex
bne .loopMove
; result[0] = 0;
lda #0
sta remainder
; for (int j = 16-1; j >= 0; j--)
ldx #QR_DEGREE-1
.loopJ
; result[j] ^= reedSolomonMultiply(generator[j], factor);
lda Generator,x
ldy .factor
_RS_MULT
eor remainder,x
sta remainder,x
; }
dex
bpl .loopJ
; }
ldx .i
dex
bpl .loopI
ENDM
;-----------------------------------------------------------
; Returns the product of the two given field elements modulo GF(2^8/0x11D).
; All inputs are valid.
MAC _RS_MULT
;-----------------------------------------------------------
; Russian peasant multiplication (x * y)
; Input: A = x, Y = y
; Result: A
.x = tmpVars
.y = tmpVars+1
sta .x
sty .y
; uint8_t z = 0;
lda #0
; for (int i = 7; i >= 0; i--) {
ldy #7
.loopI
; z = (uint8_t)((z << 1) ^ ((z >> 7) * 0x11D));
asl
bcc .skipEorPoly
eor #<QR_POLY
.skipEorPoly
; z ^= ((y >> i) & 1) * x;
asl .y
bcc .skipEorX
eor .x
.skipEorX
; }
dey
bpl .loopI
ENDM
;-----------------------------------------------------------
; Draws the raw codewords (including data and ECC) onto the given QR Code. This requires the initial state of
; the QR Code to be black at function modules and white at codeword modules (including unused remainder bits).
MAC _DRAW_CODEWORDS
;-----------------------------------------------------------
; Note: This part has the maximum RAM usage
.right1 = tmpVars+0
.vert = tmpVars+1
.j = tmpVars+2
.y = tmpVars+3
.iBit = tmpVars+4
.iByte = tmpVars+5
; blacken the (right) function modules in the bitmap
IF QR_OVERLAP
_BLACK_RIGHT ; returns with X = 0
ELSE
_BLACK_FUNC ; returns with X = 0
ENDIF
; int i = 0; // Bit index into the data
; ldx #0
; 2600 code has data in reversed order
stx .iBit
lda #QR_TOTAL-1
sta .iByte
; // Do the funny zigzag scan
; Note: 2600 code has .right1 increased by 1
; for (int right = qrsize - 1; right >= 1; right -= 2) { // Index of right column in each column pair
ldy #QR_SIZE-1+1
.loopRight
; if (right == 6)
cpy #6+1
bne .not6
; right = 5;
dey ; skip the timing column
.not6
sty .right1
IF QR_OVERLAP
; overwrite shared data
cpy #16+1
bne .skipBlackMiddle
; blacken the middle function modules in the bitmap
_BLACK_MIDDLE
.skipBlackMiddle
cpy #8+1
bne .skipBlackLeft
; blacken the left function modules in the bitmap
_BLACK_LEFT
.skipBlackLeft
ENDIF
; for (int vert = 0; vert < qrsize; vert++) { // Vertical counter
ldy #QR_SIZE-1
.loopVert
sty .vert
; bool upward = ((right + 1) & 2) != 0; // 2600 code works in reverse
lda .right1
and #$02
bne .notUp
; int y = upward ? qrsize - 1 - vert : vert; // Actual y coordinate
lda #QR_SIZE-1;+1
sec
sbc .vert
tay
.notUp
sty .y
; for (int j = 0; j < 2; j++) {
; some tricky code with .j here
ldy .right1
BIT_B
.loopJ
dey
sty .j
; int x = right - j; // Actual x coordinate
dey
; if (!getModule(qrcode, x, y) && i < dataLen * 8) {
; ldy .x
ldx .y
jsr CheckPixel
bne .skipPixel
; bool black = getBit(data[i >> 3], 7 - (i & 7));
ldx .iByte
lda data,x
ldx .iBit
and BitMask,x
beq .skipInv
; setModule(qrcode, x, y, black);
; ldy .x
ldx .y
jsr InvertPixel
ldx .iBit
.skipInv
; i++;
inx
txa
and #$07
sta .iBit
bne .skipByte
dec .iByte
bmi .exitDraw ; 2600 code exits here!
.skipByte
; }
.skipPixel
ldy .j
cpy .right1
beq .loopJ
; } // for j
ldy .vert
dey
bpl .loopVert
; } // for vert
ldy .right1
dey
dey
bpl .loopRight ; unconditional!
; } // for right
.exitDraw
ENDM
;-----------------------------------------------------------
MAC _APPLY_MASK
;-----------------------------------------------------------
IF QR_SINGLE_MASK
.y = tmpVars
ldx #QR_SIZE - 1
.loopY
stx .y
ldy #QR_SIZE - 1
.loopX
; 0: (x + y) % 2 == 0
tya
eor .y
lsr
bcs .skipInvert
jsr InvertPixel
.skipInvert
dey
bpl .loopX
dex
bpl .loopY
ELSE
.y = tmpVars
;.x = tmpVars+2
.xMod3 = tmpVars+1
.yMod3 = tmpVars+2
.xDiv3 = tmpVars+3
.tmp = tmpVars+4
lda #0
sta .yMod3
ldx #QR_SIZE - 1
.loopY
stx .y
lda #0
sta .xMod3
sta .xDiv3
ldy #QR_SIZE - 1
.loopX
; sty .x
lda qrPattern
bne .not0
; 0: (x + y) % 2 == 0
tya
eor .y
bpl .checkMod2
.not0
cmp #4
bne .not4
; 4: (x / 3 + y / 2) % 2 == 0
lda .y
lsr
adc .xDiv3
bpl .checkMod2
.not4
bcs .above4
lsr
bcs .not2
; 2: x % 3 == 0
lda .xMod3
beq .invert
bne .skipInvert
.not2
bne .is3
; 1: y % 2 == 0
txa
bpl .checkMod2
.is3
; 3: (x + y) % 3 == 0
lda .xMod3
; sec
sbc .yMod3
beq .invert
bne .skipInvert
.above4
cmp #6
beq .is6
bcs .is7
.is6
php
; 5: x * y % 2 + x * y % 3 == 0
; 6: (x * y % 2 + x * y % 3) % 2 == 0
lda .xMod3
beq .modEven56
lda .yMod3
beq .modEven56
clc
adc .xMod3
BIT_W
.modEven56
lda #0
sta .tmp
tya
lsr
bcc .even56
txa
lsr
bcc .even56
inc .tmp
.even56
plp
lda .tmp
bcs .checkMod2
beq .invert
bne .skipInvert
.is7
; 7: ((x + y) % 2 + x * y % 3) % 2 == 0
tya
eor .y
sta .tmp
lda .xMod3
beq .modEven7
lda .yMod3
beq .modEven7
clc
adc .xMod3
adc .tmp
sta .tmp
.modEven7
lda .tmp
.checkMod2
lsr
bcs .skipInvert
.invert
jsr InvertPixel
.skipInvert
; next X
dec .xMod3
bpl .xMod3OK
lda #2
sta .xMod3
inc .xDiv3
.xMod3OK
dey
bpl .loopX
; next Y
dec .yMod3
bpl .yMod3OK
lda #2
sta .yMod3
.yMod3OK
dex
bmi .exitLoopY
jmp .loopY
.exitLoopY
ENDIF ; !QR_SINGLE_MASK
ENDM
;-----------------------------------------------------------
MAC _DRAW_FORMAT
;-----------------------------------------------------------
IF QR_SINGLE_MASK = 0
.idx = tmpVars
ldy #QR_FORMATS-1
.loopFormat
sty .idx
cpy #8
; IF QR_SINGLE_MASK
; lda #%10101000
; and BitMask,y
; bcc .lowFormat
; lda #%00100100
; ELSE
ldx qrPattern
lda FormatLo,x
and BitMask,y
bcc .lowFormat
lda FormatHi,x
; ENDIF
and BitMask-8,y
.lowFormat
beq .skipFormat
ldx FormatY1,y
lda FormatX1,y
tay
jsr InvertPixel
ldy .idx
ldx FormatY2,y
lda FormatX2,y
tay
jsr InvertPixel
ldy .idx
.skipFormat
dey
bpl .loopFormat
ENDIF
ENDM
; ********** The user macros start here: **********
;-----------------------------------------------------------
MAC START_MSG
;-----------------------------------------------------------
; A = message length
; add mode and length to message data
tax
lsr
lsr
lsr
lsr
ora #(QR_MODE << 4)
; (QR_MODE << 4) | (MSG_LEN >> 4)
sta msgData + QR_MAX_DATA - 1
txa
asl
asl
asl
asl
; (MSG_LEN << 4)
sta msgData + QR_MAX_DATA - 2
lda #QR_MAX_DATA - 3
sta msgIdx
; clear the remaining data buffer
ldx #QR_TOTAL-3
lda #0
.loopClear
sta data,x
dex
bpl .loopClear
ENDM
;---------------------------------------------------------------
MAC ADD_MSG_BYTE
;---------------------------------------------------------------
; A = byte to add
ldx msgIdx
pha
lsr
lsr
lsr
lsr
ora msgData + 1,x
sta msgData + 1,x
pla
asl
asl
asl
asl
sta msgData,x
dec msgIdx
ENDM
;-----------------------------------------------------------
MAC STOP_MSG
;-----------------------------------------------------------
IF QR_PADDING
.msgLen = tmpVars
; pad with optional filler bytes (QR code works without too)
lda #QR_MAX_MSG - 1
sec
sbc .msgLen
bcc .noPadding
tax
.loopPadding
lda #$ec ; defined by QR standard
sta msgData,x
dex
bmi .noPadding
lda #$11 ; defined by QR standard
sta msgData,x
dex
bpl .loopPadding
.noPadding
ENDIF
ENDM
;-----------------------------------------------------------
MAC GEN_QR_CODE
;-----------------------------------------------------------
; This is the main macro to use!
QRCodeCode
; calculate the ECC
RSRemainder
_RS_REMAINDER
; draw the code words onto the bitmap
DrawCodes
_DRAW_CODEWORDS
; apply the pattern mask
ApplyMask
_APPLY_MASK
; blacken the function modules in the bitmap again
; and draw the function modules in the bitmap
DrawFunc
_DRAW_FUNC
; draw the format bits
DrawFormat
_DRAW_FORMAT
ECHO "QR Code encoding code:", [. - QRCodeCode]d, "bytes"
_QR_TOTAL SET _QR_TOTAL + . - QRCodeCode
ENDM
;-----------------------------------------------------------
MAC QR_CODE_DATA
;-----------------------------------------------------------
; Add this to your code's data area
QRCodeData
; Format Information Strings
IF QR_SINGLE_MASK = 0
IF QR_LEVEL = 0 ; L
FormatLo
.byte %11101111
.byte %11100101
.byte %11111011
.byte %11110001
.byte %11001100
.byte %11000110
.byte %11011000
.byte %11010010
FormatHi
.byte %10001000
.byte %11100110
.byte %01010100
.byte %00111010
.byte %01011110
.byte %00110000
.byte %10000010
.byte %11101100
ENDIF
IF QR_LEVEL = 1 ; M
FormatLo
.byte %10101000
.byte %10100010
.byte %10111100
.byte %10110110
.byte %10001011
.byte %10000001
.byte %10011111
.byte %10010101
FormatHi
.byte %00100100
.byte %01001010
.byte %11111000
.byte %10010110
.byte %11110010
.byte %10011100
.byte %00101110
.byte %01000000
ENDIF
IF QR_LEVEL = 2 ; Q
FormatLo
.byte %01101010
.byte %01100000
.byte %01111110
.byte %01110100
.byte %01001001
.byte %01000011
.byte %01011101
.byte %01010111
FormatHi
.byte %10111110
.byte %11010000
.byte %01100010
.byte %00001100
.byte %01101000
.byte %00000110
.byte %10110100
.byte %11011010
ENDIF
IF QR_LEVEL = 3 ; H
FormatLo
.byte %00101101
.byte %00100111
.byte %00111001
.byte %00110011
.byte %00001110
.byte %00000100
.byte %00011010
.byte %00010000
FormatHi
.byte %00010010
.byte %01111100
.byte %11001110
.byte %10100000
.byte %11000100
.byte %10101010
.byte %00011000
.byte %01110110
ENDIF
ENDIF ; /QR_SINGLE_MASK = 0
; position of the 15 type information bits
FormatX1
.byte 0, 1, 2, 3, 4, 5, 7, 8
.byte 8, 8, 8, 8, 8, 8, 8
FormatY2
.byte 0, 1, 2, 3, 4, 5, 6
; ds 8, QR_SIZE-9 ; shared
FormatY1
ds 8, QR_SIZE-9
.byte QR_SIZE-8, QR_SIZE-6, QR_SIZE-5, QR_SIZE-4
.byte QR_SIZE-3, QR_SIZE-2, QR_SIZE-1
FormatX2
ds 7, 8
.byte QR_SIZE-8, QR_SIZE-7, QR_SIZE-6, QR_SIZE-5
.byte QR_SIZE-4, QR_SIZE-3, QR_SIZE-2, QR_SIZE-1
ENDIF ; QR_SINGLE_MASK = 0
BitMask
.byte $80, $40, $20, $10, $8, $4, $2, $1
Generator ; data in reversed order!
IF QR_DEGREE = 7
.byte $75, $44, $0b, $a4, $9a, $7a, $7f
ENDIF
IF QR_DEGREE = 10
.byte $c1, $9d, $71, $5f, $5e, $c7, $6f, $9f
.byte $c2, $d8
ENDIF
IF QR_DEGREE = 13
.byte $87, $84, $53, $2b, $2e, $0d, $34, $11
.byte $b1, $11, $e3, $49, $89
ENDIF
IF QR_DEGREE = 15
.byte $1a, $86, $20, $97, $84, $8b, $69, $69
.byte $0a, $4a, $70, $a3, $6f, $c4, $1d
ENDIF
IF QR_DEGREE = 16
; Reed-Solomon ECC generator polynomial for degree 16
; g(x)=(x+1)(x+?)(x+?^2)(x+?^3)...(x+?^15)
; = x^16+3bx^15+0dx^14+68x^13+bdx^12+44x^11+d1x^10+1e^x9+08x^8
; +a3x^7+41x^6+29x^5+e5x^4+62x^3+32x^2+24x+3b
.byte $3b, $24, $32, $62, $e5, $29, $41, $a3
.byte $08, $1e, $d1, $44, $bd, $68, $0d, $3b
ENDIF
IF QR_DEGREE = 17
.byte $4f, $63, $7d, $35, $55, $86, $8f, $29
.byte $f9, $53, $c5, $16, $77, $78, $53, $42
.byte $77
ENDIF
IF QR_DEGREE = 22
.byte $f5, $91, $1a, $e6, $da, $56, $fd, $43
.byte $7b, $1d, $89, $1c, $28, $45, $bd, $13
.byte $f4, $b6, $b0, $83, $b3, $59
ENDIF
IF QR_DEGREE = 26
.byte $5e, $2b, $4d, $92, $90, $46, $44, $87
.byte $2a, $e9, $75, $d1, $28, $91, $18, $ce
.byte $38, $4d, $98, $c7, $62, $88, $04, $b7
.byte $44, $f6
ENDIF
IF QR_DEGREE = 28
.byte $c5, $3a, $4a, $b0, $93, $79, $64, $b5
.byte $7f, $e9, $77, $75, $38, $f7, $0c, $a7
.byte $29, $64, $ae, $67, $96, $d0, $fb, $12
.byte $0d, $1c, $09, $fc
ENDIF
QR_DEGREE = . - Generator ; verify data
ECHO "QR Code encoding data:", [. - QRCodeData]d, "bytes"
_QR_TOTAL SET _QR_TOTAL + . - QRCodeData
ENDM
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