nuclear@6: #ifndef MEGADRIVE_IO_H_
nuclear@6: #define MEGADRIVE_IO_H_
nuclear@6: 
nuclear@7: #include <stdint.h>
nuclear@7: 
nuclear@7: #define IO_REG_VER		*((volatile uint8_t*)0xa10001)
nuclear@7: #define IO_REG_DATA1	*((volatile uint8_t*)0xa10003)
nuclear@7: #define IO_REG_DATA2	*((volatile uint8_t*)0xa10005)
nuclear@7: #define IO_REG_DATA3	*((volatile uint8_t*)0xa10007)
nuclear@7: #define IO_REG_CTRL1	*((volatile uint8_t*)0xa10009)
nuclear@7: #define IO_REG_CTRL2	*((volatile uint8_t*)0xa1000b)
nuclear@7: #define IO_REG_CTRL3	*((volatile uint8_t*)0xa1000d)
nuclear@7: #define IO_REG_TXDATA1	*((volatile uint8_t*)0xa1000f)
nuclear@7: #define IO_REG_RXDATA1	*((volatile uint8_t*)0xa10011)
nuclear@7: #define IO_REG_S_CTRL1	*((volatile uint8_t*)0xa10013)
nuclear@7: #define IO_REG_TXDATA2	*((volatile uint8_t*)0xa10015)
nuclear@7: #define IO_REG_RXDATA2	*((volatile uint8_t*)0xa10017)
nuclear@7: #define IO_REG_S_CTRL2	*((volatile uint8_t*)0xa10013)
nuclear@7: #define IO_REG_TXDATA3	*((volatile uint8_t*)0xa1001b)
nuclear@7: #define IO_REG_RXDATA3	*((volatile uint8_t*)0xa1001d)
nuclear@7: #define IO_REG_S_CTRL3	*((volatile uint8_t*)0xa1001f)
nuclear@7: #define IO_REG_LOCK		*((volatile uint8_t*)0xa14000)
nuclear@7: #define IO_REG_TMSS		*((volatile uint8_t*)0xa14101)
nuclear@7: 
nuclear@8: #define IO_REG_DATA(x)	*((volatile uint8_t*)0xa10003 + ((x) << 1))
nuclear@8: #define IO_REG_CTRL(x)	*((volatile uint8_t*)0xa10009 + ((x) << 1))
nuclear@8: 
nuclear@6: 
nuclear@6: enum {
nuclear@6: 	IO_VER_VERSION_MASK = 0x0f,
nuclear@6: 	IO_VER_EXP		= 0x20,
nuclear@6: 	IO_VER_PAL		= 0x40,
nuclear@6: 	IO_VER_NONJP	= 0x80
nuclear@6: };
nuclear@6: 
nuclear@8: enum {
nuclear@8: 	IO_PAD_UP		= 1,
nuclear@8: 	IO_PAD_DOWN		= 2,
nuclear@8: 	IO_PAD_LEFT		= 4,
nuclear@8: 	IO_PAD_RIGHT	= 8,
nuclear@8: 	IO_PAD_B		= 16,
nuclear@8: 	IO_PAD_C		= 32,
nuclear@8: 	IO_PAD_A		= 64,
nuclear@8: 	IO_PAD_START	= 128
nuclear@8: };
nuclear@8: 
nuclear@8: static inline void io_setdir(int port, uint8_t dir)
nuclear@8: {
nuclear@8: 	IO_REG_CTRL(port) = dir;
nuclear@8: }
nuclear@8: 
nuclear@8: static inline uint16_t io_readpad(int port)
nuclear@8: {
nuclear@8: 	uint16_t bnstate;
nuclear@8: 
nuclear@8: 	io_setdir(port, 0x40);		/* pin 6 (multiplexer) output, 0-5 inputs */
nuclear@8: 	IO_REG_DATA(port) = 0x40;	/* select mode 1 */
nuclear@8: 	bnstate = IO_REG_DATA(port);
nuclear@8: 	IO_REG_DATA(port) = 0;		/* select mode 0 */
nuclear@8: 	bnstate |= (IO_REG_DATA(port) << 2) & (IO_PAD_A | IO_PAD_START);
nuclear@8: 	return bnstate;
nuclear@8: }
nuclear@8: 
nuclear@6: #endif	/* MEGADRIVE_IO_H_ */