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#ifndef _FIFO_H_

#define _FIFO_H_

#include <stdio.h>

#include "91x_lib.h"

#define NO_ITLine 0xFFFF

// the fifo object

typedef struct

{

        u8 *buffer;                             // pointer to start of the ringbuffer

        u16 count;                              // number of bytes in FIFO

        u16 size;                               // buffer size

        u8 *pread;                              // read pointer

        u8 *pwrite;                             // write pointer

        u16 putvicsource;               // IRQ source to block, during put

        u16 getvicsource;               // IRQ source to block, during get

} fifo_t;

/*

The initialization of the FIFO sets the read/write pointers etc..

The FIFO uses the buffer 'buf' which byte length must 'size'.

Returns 1 on success ans 0 in case of an error.

*/

u8 fifo_init (fifo_t* f, u8* buffer, const u16 size, u16 putvicsource, u16 getvicsource);

/*

Puts a byte into the FIFO. Returns 1 on success and 0 in case of FIFO overflow.

*/

u8 fifo_put (fifo_t* f, const u8 data);

/*

Get the next byte from the FIFO. Returns 0 if the FIFO is empty.

*/

u8 fifo_get (fifo_t* f, u8* pdata);

/*

Get the next byte out of the FIFO. If the FIFO is empty the function blocks

until the next byte is put into the FIFO.

*/

u8 fifo_get_wait (fifo_t* f, u8* pdata);

/*

Purges the FIFO so that it is empty afterwards

*/

void fifo_purge (fifo_t* f);

#endif /* _FIFO_H_ */