1#ifndef GBA_GPIO_H
 2#define GBA_GPIO_H
 3
 4#include <stdint.h>
 5
 6#define IS_GPIO_REGISTER(reg) ((reg) == GPIO_REG_DATA || (reg) == GPIO_REG_DIRECTION || (reg) == GPIO_REG_CONTROL)
 7
 8enum GPIODevice {
 9	GPIO_NONE = 0,
10	GPIO_RTC = 1,
11	GPIO_RUMBLE = 2,
12	GPIO_LIGHT_SENSOR = 4,
13	GPIO_GYRO = 8
14};
15
16enum GPIORegister {
17	GPIO_REG_DATA = 0xC4,
18	GPIO_REG_DIRECTION = 0xC6,
19	GPIO_REG_CONTROL = 0xC8
20};
21
22enum GPIODirection {
23	GPIO_WRITE_ONLY = 0,
24	GPIO_READ_WRITE = 1
25};
26
27union RTCControl {
28	struct {
29		unsigned : 3;
30		unsigned minIRQ : 1;
31		unsigned : 2;
32		unsigned hour24 : 1;
33		unsigned poweroff : 1;
34	};
35	uint8_t packed;
36};
37
38enum RTCCommand {
39	RTC_RESET = 0,
40	RTC_DATETIME = 2,
41	RTC_FORCE_IRQ = 3,
42	RTC_CONTROL = 4,
43	RTC_TIME = 6
44};
45
46union RTCCommandData {
47	struct {
48		unsigned magic : 4;
49		enum RTCCommand command : 3;
50		unsigned reading : 1;
51	};
52	uint8_t packed;
53};
54
55struct GBARTC {
56	int bytesRemaining;
57	int transferStep;
58	int bitsRead;
59	int bits;
60	int commandActive;
61	union RTCCommandData command;
62	union RTCControl control;
63	uint8_t time[7];
64};
65
66struct GBACartridgeGPIO {
67	int gpioDevices;
68	enum GPIODirection readWrite;
69	uint16_t* gpioBase;
70
71	union {
72		struct {
73			unsigned p0 : 1;
74			unsigned p1 : 1;
75			unsigned p2 : 1;
76			unsigned p3 : 1;
77		};
78		uint16_t pinState;
79	};
80
81	union {
82		struct {
83			unsigned dir0 : 1;
84			unsigned dir1 : 1;
85			unsigned dir2 : 1;
86			unsigned dir3 : 1;			
87		};
88		uint16_t direction;
89	};
90
91	struct GBARTC rtc;
92};
93
94void GBAGPIOInit(struct GBACartridgeGPIO* gpio, uint16_t* gpioBase);
95void GBAGPIOWrite(struct GBACartridgeGPIO* gpio, uint32_t address, uint16_t value);
96
97void GBAGPIOInitRTC(struct GBACartridgeGPIO* gpio);
98
99#endif