annotate src/vdp.c @ 7:108ecc582a11
defined all the I/O register addresses in io.h
| author |
John Tsiombikas <nuclear@member.fsf.org> |
| date |
Wed, 21 Jun 2017 06:49:50 +0300 |
| parents |
ce1b05082ac4 |
| children |
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1 #include "vdp.h"
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2
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3 void vdp_init(void)
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4 {
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5 int i;
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6
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7 vdp_setreg(VDP_REG_MODE1, VDP_MODE1_BASE);
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8 vdp_setreg(VDP_REG_MODE2, VDP_MODE2_BASE | VDP_MODE2_DISP);
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9
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10 vdp_set_nametab_addr(VDP_PLANE_A, 0xc000);
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11 vdp_set_nametab_addr(VDP_PLANE_B, 0xe000);
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12 vdp_disable_layer(VDP_PLANE_WIN);
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13 vdp_set_scroll_table(0xd000);
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14 vdp_set_sprite_table(0xd400);
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15
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16 vdp_setreg(VDP_REG_MODE3, VDP_MODE3_BASE);
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17 vdp_setreg(VDP_REG_MODE4, VDP_MODE4_BASE | VDP_MODE4_H40CELL);
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18 vdp_setreg(VDP_REG_SCROLL_SIZE, VDP_SCROLL_H64 | VDP_SCROLL_V32);
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19
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20 vdp_set_autoinc(2);
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21 vdp_set_bgcolor(0, 0);
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22
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23 vdp_setreg(VDP_REG_HINTR, 0);
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24 vdp_setreg(VDP_REG_WIN_XPOS, 0);
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25 vdp_setreg(VDP_REG_WIN_YPOS, 0);
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26
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27 /* clear vmem at the planes A/B name tables, scroll table, and sprite table */
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28 vdp_setup_access(0xd000, VDP_MEM_WRITE, VDP_MEM_VRAM);
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29 for(i=0xd000; i<65536; i++) {
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30 VDP_PORT_DATA = 0;
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31 }
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32 }
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