89 lines
2.3 KiB
NASM
89 lines
2.3 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2025 by Martin Preuss
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; email : martin@libchipcard.de
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;
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; ***************************************************************************
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; * This file is part of the project "AqHome". *
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; * Please see toplevel file COPYING of that project for license details. *
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; ***************************************************************************
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; ***************************************************************************
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; code
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.cseg
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; ---------------------------------------------------------------------------
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; @routine ili9341WriteCharacterFromFont8x8
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; @param R16 character to write
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; @param R1:R0 background color
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; @param R3:R2 foreground color
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; @param Z pointer to font
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; @param X pointer to RAM to store data to
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; @clobbers r17, r24, r25, x, z
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ili9341WriteCharacterFromFont8x8:
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rcall ili9341GetCharPosInFont8x8 ; (r17, r24, r25, z)
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ldi r25, 8 ; 8 bytes
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ili9341WriteCharacterFromFont8x8_loop1:
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ldi r24, 8 ; 8 bits
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lpm r17, Z+
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ili9341WriteCharacterFromFont8x8_loop2:
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lsr r17
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brcs ili9341WriteCharacterFromFont8x8_writeForeground
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st X+, r0
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st X+, r1
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rjmp ili9341WriteCharacterFromFont8x8_loop2end
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ili9341WriteCharacterFromFont8x8_writeForeground:
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st X+, r2
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st X+, r3
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ili9341WriteCharacterFromFont8x8_loop2end:
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dec r24
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brne ili9341WriteCharacterFromFont8x8_loop2
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dec r25
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brne ili9341WriteCharacterFromFont8x8_loop1
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ili9341GetCharPosInFont8x8
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; @param R16 character to write
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; @param Z pointer to font
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; @return Z pointer to begin of char data
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; @clobbers r17, r24, r25, z
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ili9341GetCharPosInFont8x8:
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mov r24, r16
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lpm r17, Z+ ; first char num
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sub r24, r17
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brcc ili9341GetCharPosInFont8x8_firstValueOkay
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adiw zh:zl, 1 ; use first char
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ret
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ili9341GetCharPosInFont8x8_firstValueOkay:
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lpm r17, Z+
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cp r24, r17
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brcs ili9341WriteCharacterFromFont8x8_gotPos
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ret
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ili9341WriteCharacterFromFont8x8_gotPos:
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clr r25
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lsl r24 ; R16x8
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rol r25
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lsl r24
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rol r25
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lsl r24
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rol r25
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add zl, r24
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adc zh, r25
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ret
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; @end
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