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Working end of screen scrolling

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Daniele Verducci su MatissePenguin
2021-02-22 19:55:53 +01:00
parent 2c65665900
commit 2b3f9946d9
3 changed files with 59 additions and 88 deletions
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41
pat80-io-devices/composite-pal-adapter/software/avr-assembly/main.asm
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@@ -79,17 +79,17 @@ main:
; clear ram
;*** Load data into ram ***
; Set X to 0x0100
; ldi XH, high(FRAMEBUFFER)
; ldi XL, low(FRAMEBUFFER)
; load_mem_loop:
; clr r17
; st X+, r17
; ; if reached the last framebuffer byte, exit cycle
; cpi XH, 0b00111110
; brne load_mem_loop ; if not 0, repeat h_picture_loop
; cpi XL, 0b11000000
; brne load_mem_loop ; if not 0, repeat h_picture_loop
Set X to 0x0100
ldi XH, high(FRAMEBUFFER)
ldi XL, low(FRAMEBUFFER)
load_mem_loop:
clr r17
st X+, r17
; if reached the last framebuffer byte, exit cycle
cpi XH, 0b00111110
brne load_mem_loop ; if not 0, repeat h_picture_loop
cpi XL, 0b11000000
brne load_mem_loop ; if not 0, repeat h_picture_loop
@@ -122,34 +122,27 @@ main:
; draw example image
call draw_cat
;call draw_cat
; test draw character routine
call draw_carriage_return
call draw_carriage_return
call draw_carriage_return
call cursor_pos_home
ldi r18, 0x41
dctest:
ldi r18, 0x41
draw_chars:
mov HIGH_ACCUM, r18
call draw_char
inc r18
cpi r18, 0x5B
brne dc_continue
ldi r18, 0x41
call draw_carriage_return
dc_continue:
; wait
ser r19
dc_wait_loop_1:
ser r20
ldi r24, 64
dc_wait_loop_2:
dec r20
dec r24
brne dc_wait_loop_2
dec r19
brne dc_wait_loop_1
inc r18
cpi r18, 0x5B
brne draw_chars
jmp dctest