gbdk-2020 | GameBoy Development Kit |
| download: https://git.y1.nz/archives/gbdk.tar.gz | |
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gbdk-lib/libc/targets/z80/msxdos/msx_set_native_data.s
1 .include "global.s"
2
3 .title "VRAM utilities"
4 .module VRAMUtils
5
6 .ez80
7
8 .area _HOME
9
10 ; void set_native_tile_data(uint16_t start, uint16_t ntiles, const void *src) __z88dk_callee
11 _set_native_tile_data::
12 DISABLE_VBLANK_COPY ; switch OFF copy shadow SAT
13
14 pop bc
15 pop hl
16 pop iy
17 pop de
18 push bc
19
20 add hl, hl
21 add hl, hl
22 add hl, hl
23
24 push hl
25
26 ld bc, #.VDP_COLORDATA0
27 add hl, bc
28 ex (sp), hl
29
30 ld bc, #.VDP_TILEDATA0
31 add hl, bc
32
33 ld c, #.VDP_DATA
34 inc iyh
35 inc iyl
36 jr 2$
37
38 1$:
39 VDP_WRITE_CMD h, l
40 ex de, hl
41 ld b, #8
42 3$:
43 outi
44 jr nz, 3$
45 ex de, hl
46
47 ld a, #8
48 ADD_A_REG16 h, l
49 ex (sp), hl
50
51 VDP_WRITE_CMD h, l
52 ex de, hl
53 ld b, #8
54 4$:
55 outi
56 jr nz, 4$
57 ex de, hl
58
59 ld a, #8
60 ADD_A_REG16 h, l
61 ex (sp), hl
62
63 2$:
64 dec iyl
65 jr nz, 1$
66
67 dec iyh
68 jr nz, 1$
69
70 pop hl
71
72 ENABLE_VBLANK_COPY ; switch ON copy shadow SAT
73
74 ret
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