megadrive_test2
view src/io.h @ 10:ca7108a82867
fixed gamepad input on real megadrive
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 24 Jun 2017 02:33:52 +0300 |
| parents | 6ecf2f3ff05a |
| children | 302bcd73edc4 |
line source
1 #ifndef MEGADRIVE_IO_H_
2 #define MEGADRIVE_IO_H_
4 #include <stdint.h>
6 #define IO_REG_VER *((volatile uint8_t*)0xa10001)
7 #define IO_REG_DATA1 *((volatile uint8_t*)0xa10003)
8 #define IO_REG_DATA2 *((volatile uint8_t*)0xa10005)
9 #define IO_REG_DATA3 *((volatile uint8_t*)0xa10007)
10 #define IO_REG_CTRL1 *((volatile uint8_t*)0xa10009)
11 #define IO_REG_CTRL2 *((volatile uint8_t*)0xa1000b)
12 #define IO_REG_CTRL3 *((volatile uint8_t*)0xa1000d)
13 #define IO_REG_TXDATA1 *((volatile uint8_t*)0xa1000f)
14 #define IO_REG_RXDATA1 *((volatile uint8_t*)0xa10011)
15 #define IO_REG_S_CTRL1 *((volatile uint8_t*)0xa10013)
16 #define IO_REG_TXDATA2 *((volatile uint8_t*)0xa10015)
17 #define IO_REG_RXDATA2 *((volatile uint8_t*)0xa10017)
18 #define IO_REG_S_CTRL2 *((volatile uint8_t*)0xa10013)
19 #define IO_REG_TXDATA3 *((volatile uint8_t*)0xa1001b)
20 #define IO_REG_RXDATA3 *((volatile uint8_t*)0xa1001d)
21 #define IO_REG_S_CTRL3 *((volatile uint8_t*)0xa1001f)
22 #define IO_REG_LOCK *((volatile uint8_t*)0xa14000)
23 #define IO_REG_TMSS *((volatile uint8_t*)0xa14101)
25 #define IO_REG_DATA(x) *((volatile uint8_t*)0xa10003 + ((x) << 1))
26 #define IO_REG_CTRL(x) *((volatile uint8_t*)0xa10009 + ((x) << 1))
29 enum {
30 IO_VER_VERSION_MASK = 0x0f,
31 IO_VER_EXP = 0x20,
32 IO_VER_PAL = 0x40,
33 IO_VER_NONJP = 0x80
34 };
36 enum {
37 IO_PAD_UP = 1,
38 IO_PAD_DOWN = 2,
39 IO_PAD_LEFT = 4,
40 IO_PAD_RIGHT = 8,
41 IO_PAD_B = 16,
42 IO_PAD_C = 32,
43 IO_PAD_A = 64,
44 IO_PAD_START = 128
45 };
46 #define IO_PAD_LOW_MASK 0x3f
47 #define IO_PAD_HIGH_MASK (IO_PAD_A | IO_PAD_START)
49 static inline void io_setdir(int port, uint8_t dir)
50 {
51 IO_REG_CTRL(port) = dir;
52 }
54 static inline uint16_t io_readpad(int port)
55 {
56 uint16_t bnstate;
58 bnstate = ~(IO_REG_DATA(port) << 2) & IO_PAD_HIGH_MASK;
60 IO_REG_DATA(port) = 0x40; /* select mode 1 */
61 asm volatile("nop");
62 asm volatile("nop");
63 bnstate |= ~IO_REG_DATA(port) & IO_PAD_LOW_MASK;
65 IO_REG_DATA(port) = 0; /* select mode 0 */
66 return bnstate;
67 }
69 void io_init(void);
70 /*uint16_t io_readpad(int port);*/
72 #endif /* MEGADRIVE_IO_H_ */