1#ifndef GBA_SIO_H
 2#define GBA_SIO_H
 3
 4#include <stdint.h>
 5
 6enum GBASIOMode {
 7	SIO_NORMAL_8 = 0,
 8	SIO_NORMAL_32 = 1,
 9	SIO_MULTI = 2,
10	SIO_UART = 3,
11	SIO_GPIO = 8,
12	SIO_JOYBUS = 12
13};
14
15enum {
16	RCNT_INITIAL = 0x8000
17};
18
19struct GBASIO;
20
21struct GBASIODriver {
22	struct GBASIO* p;
23
24	int (*init)(struct GBASIODriver* driver);
25	void (*deinit)(struct GBASIODriver* driver);
26	int (*load)(struct GBASIODriver* driver);
27	int (*unload)(struct GBASIODriver* driver);
28	int (*writeRegister)(struct GBASIODriver* driver, uint32_t address, uint16_t value);
29	int32_t (*processEvents)(struct GBASIODriver* driver, int32_t cycles);
30};
31
32struct GBASIODriverSet {
33	struct GBASIODriver* normal;
34	struct GBASIODriver* multiplayer;
35	struct GBASIODriver* joybus;
36};
37
38struct GBASIO {
39	struct GBA* p;
40
41	enum GBASIOMode mode;
42	struct GBASIODriverSet drivers;
43	struct GBASIODriver* activeDriver;
44
45	uint16_t rcnt;
46	union {
47		struct {
48			unsigned sc : 1;
49			unsigned internalSc : 1;
50			unsigned si : 1;
51			unsigned idleSo : 1;
52			unsigned : 4;
53			unsigned start : 1;
54			unsigned : 3;
55			unsigned length : 1;
56			unsigned : 1;
57			unsigned irq : 1;
58			unsigned : 1;
59		} normalControl;
60
61		struct {
62			unsigned baud : 2;
63			unsigned slave : 1;
64			unsigned ready : 1;
65			unsigned id : 2;
66			unsigned error : 1;
67			unsigned busy : 1;
68			unsigned : 6;
69			unsigned irq : 1;
70			unsigned : 1;
71		} multiplayerControl;
72
73		uint16_t siocnt;
74	};
75};
76
77void GBASIOInit(struct GBASIO* sio);
78void GBASIODeinit(struct GBASIO* sio);
79
80void GBASIOSetDriverSet(struct GBASIO* sio, struct GBASIODriverSet* drivers);
81void GBASIOSetDriver(struct GBASIO* sio, struct GBASIODriver* driver, enum GBASIOMode mode);
82
83void GBASIOWriteRCNT(struct GBASIO* sio, uint16_t value);
84void GBASIOWriteSIOCNT(struct GBASIO* sio, uint16_t value);
85void GBASIOWriteSIOMLT_SEND(struct GBASIO* sio, uint16_t value);
86
87int32_t GBASIOProcessEvents(struct GBASIO* sio, int32_t cycles);
88
89#endif