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annotate src/vdp.h @ 8:5176efdda5ae

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