139 lines
3.3 KiB
NASM
139 lines
3.3 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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#ifndef AQH_AVR_ILI9341_FONT12X20_ASM
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#define AQH_AVR_ILI9341_FONT12X20_ASM
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; ***************************************************************************
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; code
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.cseg
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; ---------------------------------------------------------------------------
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; @routine ili9341Font12x20MonoHandlerFn
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;
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; Handler for 12x20 Mono Fonts
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;
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ili9341Font12x20MonoHandlerFn:
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cpi r23, FONT_FN_RENDER
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breq ili9341Font12x20MonoRenderChar
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bigjmp FONT_GenericHandler
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; @end
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; ---------------------------------------------------------------------------
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; @routine ili9341Font12x20RenderCharacter
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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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; @return r18 char width in pixel
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; @return r19 char height in pixel
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; @clobbers r17, r18, r19, r23, r24, r25, x
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ili9341Font12x20MonoRenderChar:
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push zl
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push zh
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rcall ili9341Font12x20GetCharPosInFont ; (r24, r25, z)
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ldi r25, 20 ; 20 bytes height
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ili9341Font12x20MonoRenderChar_loop1:
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ldi r24, 12 ; 12 bits
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ldi r23, 8 ; bit counter
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lpm r17, Z+ ; current font byte
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ili9341Font12x20MonoRenderChar_loop2:
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dec r23
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brne ili9341Font12x20MonoRenderChar_haveByte
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lpm r17, Z+
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ldi r23, 8
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ili9341Font12x20MonoRenderChar_haveByte:
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lsr r17
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brcs ili9341Font12x20MonoRenderChar_writeForeground
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mov r18, r0
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mov r19, r1
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rjmp ili9341Font12x20MonoRenderChar_sendToDisplay
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ili9341Font12x20MonoRenderChar_writeForeground:
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mov r18, r2
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mov r19, r3
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ili9341Font12x20MonoRenderChar_sendToDisplay:
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mov r16, r19
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rcall SPIHW_MasterTransfer ; (R16)
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mov r16, r18
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rcall SPIHW_MasterTransfer ; (R16)
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ili9341Font12x20MonoRenderChar_loop2end:
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dec r24
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brne ili9341Font12x20MonoRenderChar_loop2
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dec r25
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brne ili9341Font12x20MonoRenderChar_loop1
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ldi r18, 12
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ldi r19, 20
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pop zh
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pop zl
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine ili9341Font12x20GetCharPosInFont
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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 r24, r25, z
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ili9341Font12x20GetCharPosInFont:
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mov r24, r16
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adiw zh:zl, FONT_OFFS_FIRSTCHAR
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lpm r24, Z+ ; first char num
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lpm r25, Z+ ; num of chars
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sub r16, r24
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brcs ili9341Font12x20GetCharPosInFont_ret
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cp r16, r25
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brcc ili9341Font12x20GetCharPosInFont_ret
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mov r24, r16
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clr r25
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lsl r24 ; x2
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rol r25
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lsl r24 ; x4
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rol r25
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add r24, r16 ; x5
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adc r25, r16
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sub r25, r16
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lsl r24 ; x10
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rol r25
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lsl r24 ; x20
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rol r25
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lsl r24 ; x40
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rol r25
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add zl, r24
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adc zh, r25
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ili9341Font12x20GetCharPosInFont_ret:
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ret
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; @end
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#endif ; AQH_AVR_ILI9341_FONT12X20_ASM
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