38 lines
1.3 KiB
Plaintext
38 lines
1.3 KiB
Plaintext
6502 QR Code Generator - (C)2021 Thomas Jentzsch
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Instructions:
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1. Include QRCodeGen.inc into the code area of your own code
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2. Define the following constants:
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- QR_VERSION = 1..3 ; QR code size (21, 25, 29)
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- QR_LEVEL = 0..3 ; error correction levels L, M, Q, H
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- QR_SINGLE_MASK = 0|1 ; use only the 1st of the 8 mask pattern
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- QR_PADDING = 0|1 ; add padding bytes add the end of test message text
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- QR_GENERATE = 0|1 ; generate Reed-Solomon ECC generator polynomial on-the-fly
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; else use built-in table
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3. Define memory for code generation and displayed bitmap:
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- qrTmpVars ds 9
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- qrData ds QR_TOTAL
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- qrPattern ds 1
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- qrGenerator ds QR_DEGREE (only required if QR_GENERATE = 1)
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- bitmap depends on platform
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4. Implement two subroutines:
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- GetPixel: checks the pixel at position x (Y), y (X), returns Z = 1 if not set
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- InvertPixel: inverts the pixel at position x (Y), y (X)
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Note: Both routines MUST NOT change X and Y registers!
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5. Add message text using macros
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- first START_MSG
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- then for each byte ADD_MSG_BYTE
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- finally STOP_MSG
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6. Set qrPattern to 0..7 (chosing a mask pattern)
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7. Use the GEN_QR_CODE and QR_CODE_DATA macros
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8. Draw the generated QR code bitmap
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That's all! :) |