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feat: K2 LCD splash screen with compressed bitmap #3

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144 changes: 137 additions & 7 deletions f256/k2_lcd.asm
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Original file line number Diff line number Diff line change
Expand Up @@ -50,14 +50,16 @@ init ; *** IMPORTANT -> If there is no LCD and if passes the Tests, the m

; Tests have been passed and so we may proceed

;lda #$00
;sta LCD_CTRL_REG ; We don't really a reset, it is already happened.
;jsr WAIT_100ms
lda #LCD_RST | LCD_BL
sta LCD_CTRL_REG
; Release reset but keep backlight OFF during drawing
lda #LCD_RST
sta LCD_CTRL_REG

jsr LCD_1_69_Init ; Go Init the LCD
jsr Splash_LCD_Download ; Go Get the SPI Flash Data and Feed the Display
jsr Splash_RLE_Display ; Display RLE-compressed splash screen

; Turn on backlight after image is ready
lda #LCD_RST | LCD_BL
sta LCD_CTRL_REG

init_No_Splash:
rts
Expand Down Expand Up @@ -177,6 +179,128 @@ LCD_Init_CMD_E0_SEQ .text $F0, $00, $04, $04, $04, $05, $29, $33, $3E, $38, $
LCD_Init_CMD_E1_SEQ .text $F0, $07, $0A, $0D, $0B, $07, $28, $33, $3E, $36, $14, $14, $29, $32


; ================================
; Palette-based RLE splash display
; ================================
; Displays the palette-based RLE-compressed splash screen data to the LCD.
; Uses zero page locations:
; $80/$81 - 16-bit pointer to current position in RLE data
; $82/$83 - 16-bit pointer to end of RLE data
; $84 - temporary for pixel count
;
Splash_RLE_Display:
; Setup the LCD window (240x270)
; 2A Command (Window X): XS=0, XE=239
lda #$2A
sta LCD_CMD_CMD
lda #$00 ; XStart_High
sta LCD_CMD_DTA
lda #$00 ; XStart_Low
sta LCD_CMD_DTA
lda #$00 ; XEnd_High
sta LCD_CMD_DTA
lda #$EF ; XEnd_Low (239)
sta LCD_CMD_DTA

; 2B Command (Window Y): YS=0, YE=319 (320 rows, matches original)
lda #$2B
sta LCD_CMD_CMD
lda #$00 ; YStart_High
sta LCD_CMD_DTA
lda #$00 ; YStart_Low (0)
sta LCD_CMD_DTA
lda #$01 ; YEnd_High (319 = $13F)
sta LCD_CMD_DTA
lda #$3F ; YEnd_Low
sta LCD_CMD_DTA

; 2C Command - Start pixel data transfer
lda #$2C
sta LCD_CMD_CMD

; Initialize pointer to RLE data
lda #<splash_rle_data
sta $80
lda #>splash_rle_data
sta $81
; Store end pointer
lda #<splash_rle_end
sta $82
lda #>splash_rle_end
sta $83

_rle_loop:
; Check if we've reached the end of data
lda $81
cmp $83
bne _rle_decode
lda $80
cmp $82
bne _rle_decode
rts ; Done!

_rle_decode:
; Read control byte
lda ($80)
jsr _inc_ptr
tax ; Save control byte in X and set flags
bmi _rle_run ; High bit set = RLE run

; Literal mode: X = count of literal color indices
txa
sta $84 ; Save count
beq _rle_loop ; Skip if count is 0

_literal_loop:
lda ($80) ; Read color index
jsr _inc_ptr
jsr _output_color
dec $84
bne _literal_loop
bra _rle_loop

_rle_run:
; Run mode: (A & 0x7F) + 1 = repeat count
and #$7F
clc
adc #1 ; count = (A & 0x7F) + 1
sta $84 ; Save count

; Read the color index to repeat
lda ($80) ; Read color index
jsr _inc_ptr
tax ; Save color index in X

_run_loop:
txa ; Get color index
jsr _output_color
dec $84
bne _run_loop
bra _rle_loop

; Output a pixel from palette
; Input: A = color index (0-5)
_output_color:
asl a ; Multiply by 2 (2 bytes per palette entry)
tay
lda splash_palette,y
sta LCD_PIX_LO
lda splash_palette+1,y
sta LCD_PIX_HI
rts

; Increment 16-bit pointer at $80/$81
_inc_ptr:
inc $80
bne _inc_ptr_done
inc $81
_inc_ptr_done:
rts


; ================================
; Old FLASH-based splash display (kept for reference)
; ================================
Splash_LCD_Download:
; The Data on the FLASH for the LCD is made of a BMP File (2 Bytes 565 Encoded) but the file doesn't have a header, so the file needs to be read inverted
; Setup the LCD Windows to go Write into - In this case it is the whole Memory (240x320)
Expand Down Expand Up @@ -361,8 +485,14 @@ wait_inner: nop

ply
plx
rts
rts

.send

; Include RLE-compressed splash screen data in fat32_code section
.section fat32_code
.include "splash_rle.inc"
.send

.endn
.endn
142 changes: 142 additions & 0 deletions f256/splash_rle.inc
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Original file line number Diff line number Diff line change
@@ -0,0 +1,142 @@
; Palette-based RLE-compressed splash screen data
; Original: 240x320 = 153600 bytes (RGB565)
; Compressed: 1932 bytes (1.3%)
; Palette: 6 colors, RLE on indices
;
; RLE format:
; Byte >= 0x80: Run of (byte & 0x7F) + 1 pixels, next byte is color index
; Byte < 0x80: Literal run of byte pixels, next bytes are color indices

; 6-color palette (RGB565 format: lo, hi)
splash_palette:
.byte $64, $08 ; 0: RGB(15, 15, 39)
.byte $C1, $58 ; 1: RGB(94, 25, 14)
.byte $22, $61 ; 2: RGB(96, 39, 17)
.byte $42, $62 ; 3: RGB(100, 74, 23)
.byte $03, $1A ; 4: RGB(27, 64, 29)
.byte $09, $2A ; 5: RGB(42, 66, 74)

splash_rle_data:
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $AE, $00
.byte $01, $05, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $D7, $00, $8A, $01, $FF, $00, $E1, $00, $90, $01, $FF, $00, $B7, $00
.byte $87, $01, $9D, $00, $94, $01, $A0, $00, $87, $01, $FF, $00, $88, $00, $8D, $01
.byte $99, $00, $97, $01, $9B, $00, $8D, $01, $FF, $00, $83, $00, $92, $01, $95, $00
.byte $9A, $01, $97, $00, $91, $01, $FF, $00, $96, $01, $92, $00, $9C, $01, $94, $00
.byte $94, $01, $FD, $00, $98, $01, $90, $00, $9F, $01, $91, $00, $97, $01, $F9, $00
.byte $9C, $01, $8E, $00, $A0, $01, $8F, $00, $99, $01, $F7, $00, $9E, $01, $8C, $00
.byte $A3, $01, $8C, $00, $9B, $01, $F5, $00, $A1, $01, $8A, $00, $A4, $01, $8A, $00
.byte $9D, $01, $F3, $00, $A3, $01, $89, $00, $A6, $01, $87, $00, $9E, $01, $F2, $00
.byte $A5, $01, $88, $00, $A8, $01, $84, $00, $A0, $01, $F0, $00, $A7, $01, $86, $00
.byte $D0, $01, $EE, $00, $A9, $01, $85, $00, $D0, $01, $ED, $00, $AB, $01, $83, $00
.byte $D2, $01, $EC, $00, $FF, $01, $82, $01, $EB, $00, $FF, $01, $84, $01, $E9, $00
.byte $FF, $01, $85, $01, $E9, $00, $FF, $01, $85, $01, $E8, $00, $FF, $01, $87, $01
.byte $E7, $00, $FF, $01, $87, $01, $E6, $00, $FF, $01, $88, $01, $E6, $00, $FF, $01
.byte $89, $01, $E4, $00, $FF, $01, $8A, $01, $E4, $00, $FF, $01, $8A, $01, $E3, $00
.byte $FF, $01, $8C, $01, $E2, $00, $FF, $01, $8C, $01, $E2, $00, $FF, $01, $8C, $01
.byte $E1, $00, $FF, $01, $8D, $01, $E1, $00, $FF, $01, $8D, $01, $E1, $00, $FF, $01
.byte $8E, $01, $E0, $00, $FF, $01, $8E, $01, $DF, $00, $FF, $01, $8F, $01, $DF, $00
.byte $FF, $01, $8F, $01, $DF, $00, $FF, $01, $8F, $01, $DF, $00, $FF, $01, $8F, $01
.byte $DF, $00, $FF, $01, $8F, $01, $DE, $00, $FF, $01, $90, $01, $DE, $00, $FF, $01
.byte $90, $01, $DE, $00, $FF, $01, $90, $01, $DE, $00, $FF, $01, $90, $01, $DE, $00
.byte $FF, $01, $90, $01, $DE, $00, $FF, $01, $90, $01, $DE, $00, $FF, $01, $90, $01
.byte $DE, $00, $FF, $01, $90, $01, $DE, $00, $FF, $02, $8F, $02, $01, $01, $DD, $00
.byte $01, $01, $FF, $02, $8F, $02, $01, $01, $DD, $00, $01, $01, $FF, $02, $8F, $02
.byte $01, $01, $DD, $00, $01, $01, $FF, $02, $8F, $02, $01, $01, $DD, $00, $01, $01
.byte $FF, $02, $8F, $02, $01, $01, $DD, $00, $01, $01, $FF, $02, $8F, $02, $01, $01
.byte $DD, $00, $01, $01, $FF, $02, $8F, $02, $01, $01, $DD, $00, $01, $01, $FF, $02
.byte $8F, $02, $01, $01, $DD, $00, $01, $01, $FF, $02, $8F, $02, $01, $01, $DD, $00
.byte $01, $01, $FF, $02, $8F, $02, $01, $01, $DD, $00, $01, $01, $FF, $02, $8F, $02
.byte $01, $01, $DD, $00, $01, $01, $FF, $02, $8F, $02, $DE, $00, $01, $01, $FF, $02
.byte $8F, $02, $DE, $00, $01, $01, $FF, $02, $8F, $02, $DE, $00, $01, $01, $FF, $02
.byte $8F, $02, $DE, $00, $01, $01, $FF, $02, $8F, $02, $DF, $00, $FF, $02, $8F, $02
.byte $DF, $00, $FF, $02, $8E, $02, $01, $01, $DF, $00, $FF, $02, $8E, $02, $01, $01
.byte $DF, $00, $FF, $02, $8E, $02, $01, $01, $DF, $00, $FF, $02, $8E, $02, $E0, $00
.byte $FF, $02, $8E, $02, $E0, $00, $01, $01, $FF, $02, $8D, $02, $E0, $00, $01, $01
.byte $FF, $02, $8C, $02, $01, $01, $E1, $00, $FF, $02, $8C, $02, $01, $01, $E1, $00
.byte $FF, $02, $8C, $02, $E2, $00, $FF, $02, $8C, $02, $E2, $00, $FF, $02, $8C, $02
.byte $E2, $00, $01, $01, $FF, $02, $8A, $02, $01, $01, $E3, $00, $FF, $02, $8A, $02
.byte $E4, $00, $FF, $02, $8A, $02, $E4, $00, $FF, $02, $8A, $02, $E4, $00, $01, $01
.byte $FF, $02, $88, $02, $01, $01, $E5, $00, $FF, $02, $88, $02, $E6, $00, $FF, $02
.byte $88, $02, $E6, $00, $FF, $02, $87, $02, $01, $01, $E7, $00, $FF, $02, $86, $02
.byte $E8, $00, $FF, $02, $86, $02, $E8, $00, $FF, $02, $85, $02, $01, $01, $E9, $00
.byte $FF, $02, $84, $02, $EA, $00, $FF, $02, $83, $02, $01, $01, $EA, $00, $01, $02
.byte $FF, $03, $82, $03, $01, $04, $EA, $00, $01, $04, $FF, $03, $82, $03, $EC, $00
.byte $FF, $03, $81, $03, $01, $02, $EC, $00, $FF, $03, $81, $03, $ED, $00, $01, $02
.byte $FF, $03, $01, $03, $EE, $00, $FF, $03, $01, $04, $EE, $00, $FF, $03, $EF, $00
.byte $01, $02, $FD, $03, $01, $02, $F0, $00, $FD, $03, $F1, $00, $FD, $03, $F1, $00
.byte $01, $04, $FB, $03, $F3, $00, $FB, $03, $F3, $00, $01, $02, $F9, $03, $01, $04
.byte $F4, $00, $F9, $03, $F5, $00, $01, $02, $F7, $03, $F7, $00, $F7, $03, $F7, $00
.byte $F6, $03, $F9, $00, $F4, $03, $01, $02, $F9, $00, $01, $02, $F3, $03, $FB, $00
.byte $F2, $03, $01, $04, $FB, $00, $01, $04, $F1, $03, $FD, $00, $F0, $03, $FF, $00
.byte $EE, $03, $01, $04, $FF, $00, $01, $04, $ED, $03, $FF, $00, $81, $00, $EC, $03
.byte $FF, $00, $83, $00, $EA, $03, $FF, $00, $85, $00, $E8, $03, $01, $04, $FF, $00
.byte $85, $00, $01, $04, $E6, $03, $01, $02, $FF, $00, $87, $00, $01, $04, $E5, $03
.byte $FF, $00, $89, $00, $01, $02, $E3, $03, $FF, $00, $8B, $00, $01, $02, $E1, $03
.byte $FF, $00, $8D, $00, $01, $02, $DF, $03, $FF, $00, $8F, $00, $01, $04, $DD, $03
.byte $FF, $00, $92, $00, $DA, $03, $01, $02, $FF, $00, $94, $00, $D8, $03, $01, $02
.byte $FF, $00, $96, $00, $01, $04, $D5, $03, $01, $04, $FF, $00, $99, $00, $D3, $03
.byte $FF, $00, $9C, $00, $01, $04, $CF, $03, $01, $04, $FF, $00, $9F, $00, $01, $04
.byte $CC, $03, $FF, $00, $A3, $00, $01, $04, $C8, $03, $01, $04, $FF, $00, $A6, $00
.byte $01, $04, $C4, $03, $01, $02, $FF, $00, $AB, $00, $01, $02, $BF, $03, $01, $02
.byte $FF, $00, $B0, $00, $BC, $04, $FF, $00, $B4, $00, $B8, $04, $FF, $00, $B7, $00
.byte $B4, $04, $FF, $00, $BC, $00, $AF, $04, $FF, $00, $C0, $00, $AB, $04, $FF, $00
.byte $C4, $00, $A6, $04, $FF, $00, $C9, $00, $A1, $04, $FF, $00, $CE, $00, $9B, $04
.byte $FF, $00, $D4, $00, $97, $04, $FF, $00, $D7, $00, $95, $04, $FF, $00, $DA, $00
.byte $92, $04, $FF, $00, $DC, $00, $91, $04, $FF, $00, $DE, $00, $8F, $04, $FF, $00
.byte $DF, $00, $8F, $04, $FF, $00, $E0, $00, $8D, $04, $FF, $00, $E1, $00, $8D, $04
.byte $FF, $00, $E1, $00, $8D, $04, $FF, $00, $E2, $00, $8C, $04, $FF, $00, $E2, $00
.byte $8C, $04, $FF, $00, $E2, $00, $8C, $04, $FF, $00, $E2, $00, $8C, $04, $FF, $00
.byte $B4, $00, $8A, $04, $A2, $00, $8D, $04, $FF, $00, $B0, $00, $92, $04, $9D, $00
.byte $8D, $04, $FF, $00, $AF, $00, $96, $04, $9A, $00, $8D, $04, $9B, $00, $8E, $04
.byte $FF, $00, $82, $00, $9B, $04, $97, $00, $8D, $04, $97, $00, $95, $04, $FE, $00
.byte $9E, $04, $95, $00, $8D, $04, $94, $00, $9B, $04, $FB, $00, $A0, $04, $94, $00
.byte $8C, $04, $91, $00, $A0, $04, $F8, $00, $A3, $04, $92, $00, $8C, $04, $8F, $00
.byte $A4, $04, $F6, $00, $A5, $04, $90, $00, $8D, $04, $8C, $00, $A7, $04, $F4, $00
.byte $A7, $04, $8F, $00, $8D, $04, $8B, $00, $A9, $04, $F3, $00, $A9, $04, $8D, $00
.byte $8D, $04, $89, $00, $AB, $04, $F2, $00, $AB, $04, $8C, $00, $8D, $04, $87, $00
.byte $AE, $04, $F1, $00, $AC, $04, $8B, $00, $8D, $04, $85, $00, $B0, $04, $F1, $00
.byte $AE, $04, $89, $00, $8E, $04, $82, $00, $B3, $04, $F0, $00, $AF, $04, $87, $00
.byte $C6, $04, $F0, $00, $B1, $04, $84, $00, $C7, $04, $EF, $00, $FF, $04, $EF, $00
.byte $FF, $04, $EF, $00, $FF, $04, $EF, $00, $FF, $04, $EF, $00, $FF, $04, $EF, $00
.byte $FF, $04, $EF, $00, $FF, $04, $EF, $00, $FE, $04, $F0, $00, $01, $04, $FB, $05
.byte $81, $04, $F1, $00, $FC, $05, $F2, $00, $FC, $05, $F2, $00, $FB, $05, $F3, $00
.byte $FB, $05, $F3, $00, $FA, $05, $F5, $00, $F9, $05, $F5, $00, $F8, $05, $F6, $00
.byte $F7, $05, $F8, $00, $F5, $05, $F9, $00, $F5, $05, $FA, $00, $F3, $05, $FC, $00
.byte $F1, $05, $FE, $00, $EF, $05, $FF, $00, $EE, $05, $FF, $00, $81, $00, $EB, $05
.byte $FF, $00, $85, $00, $E8, $05, $FF, $00, $87, $00, $E6, $05, $FF, $00, $89, $00
.byte $E3, $05, $FF, $00, $8D, $00, $DF, $05, $FF, $00, $91, $00, $DB, $05, $FF, $00
.byte $95, $00, $D7, $05, $FF, $00, $99, $00, $D2, $05, $FF, $00, $9F, $00, $CC, $05
.byte $FF, $00, $A6, $00, $C5, $05, $FF, $00, $BB, $00, $AE, $05, $FF, $00, $C5, $00
.byte $A3, $05, $FF, $00, $CD, $00, $9C, $05, $FF, $00, $D3, $00, $99, $05, $FF, $00
.byte $D6, $00, $97, $05, $FF, $00, $D7, $00, $97, $05, $FF, $00, $D8, $00, $95, $05
.byte $FF, $00, $D9, $00, $95, $05, $FF, $00, $D9, $00, $95, $05, $FF, $00, $DA, $00
.byte $93, $05, $FF, $00, $DB, $00, $93, $05, $FF, $00, $DB, $00, $93, $05, $FF, $00
.byte $DB, $00, $93, $05, $FF, $00, $DC, $00, $92, $05, $FF, $00, $DC, $00, $92, $05
.byte $FF, $00, $DD, $00, $90, $05, $FF, $00, $E1, $00, $8D, $05, $FF, $00, $E7, $00
.byte $86, $05, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00
.byte $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $FF, $00, $D3, $00

splash_rle_end:
splash_rle_size = splash_rle_end - splash_rle_data