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Initial work on VDP emulation
author Michael Pavone <pavone@retrodev.com>
date Sun, 27 Mar 2016 00:24:31 -0700
parents
children 04d8efe7a1f0
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7:8f9a05e2e425 8:5176efdda5ae
1 #ifndef VDP_H_
2 #define VDP_H_
3
4 typedef struct {
5 uint32_t cycles;
6 uint32_t clock_inc;
7
8 uint16_t fifo;
9 uint16_t dest_offset;
10 uint16_t status;
11
12 uint16_t vcounter;
13 uint16_t hcounter;
14
15 uint16_t vscroll;
16 uint16_t hscroll;
17
18 uint16_t vram[32*512];
19 uint16_t sram[64*2];
20 uint16_t cram[64];
21
22 uint8_t fifo_dest;
23 } vdp;
24
25 enum {
26 FIFO_DEST_INVALID,
27 FIFO_DEST_VRAM,
28 FIFO_DEST_SRAM,
29 FIFO_DEST_CRAM
30 };
31
32 #define VDP_STATUS_FIFO 1
33 #define VDP_STATUS_VRAM 2
34 #define VDP_STATUS_SRAM 4
35
36 void vdp_init(vdp *context, uint32_t clock_div);
37 void vdp_run(vdp *context, uint32_t target);
38 void vdp_write_address(vdp *context, uint16_t value);
39 void vdp_write_data(vdp *context, uint16_t value);
40
41 #endif //VDP_H_