#ifdef __cplusplus
extern "C" {
#endif

/* Struct to overlay on the VS4 registers. Note that the VS4 */
/* responds to both 8bit and 16bit transfers. We use the 16bit */
volatile struct VS4 {
	volatile unsigned short data;		
	volatile unsigned short done;
	volatile unsigned short control;
	volatile unsigned short status;
	volatile unsigned short interrupt;
} vs4_registers_t;

/* VS4 status register bits */
#define IRQ_S		0x80
#define TBE_S		0x40
#define IBF_S		0x20
#define DON_S		0x10
#define OVRT		0x08
#define ENCODER	0x04
#define INIT		0x02
#define CMD_S		0x01


/* Initialize the VS4 */
int VS4Init(unsigned short addr);

/* Print the VS4 registers to the screen */
int VS4Registers(void);

/* Quietly get the VS4 registers */
int VS4reg(struct VS4  *my_vs4);

/* Issue a command and print it along with any return */
/* messages to the screen in a verbose manner. */
int VS4Command(const char *mess);

/* Issue a command quietly and optionally copy the return */
/* string (if any) to the user specified buffer. chomp_ret_mess */
/* can be used to have the leading and trailing <LF> and <CR> */
/* characters stripped. */
int VS4cmd(const char *mess, char *ret_mess, int ret_mess_size, int chomp_ret_mess);

#ifdef __cplusplus
}
#endif