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46 lines
782 B
46 lines
782 B
#ifndef __FIFO_H___
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#define __FIFO_H___
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct fifo {
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unsigned char *buffer;
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unsigned int size;
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volatile unsigned int in;
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volatile unsigned int out;
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};
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typedef struct fifo * fifo_t;
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/*
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* initialize fifo with `buf', len MUST be 2'n
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*/
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int fifo_init(fifo_t fifo, void *buf, unsigned int len);
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/*
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* put data to buffer
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*/
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unsigned int fifo_put(fifo_t fifo, const unsigned char *buffer, unsigned int len);
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unsigned int fifo_get(fifo_t fifo, unsigned char *buffer, unsigned int len);
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/*
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* drop all data in the fifo.
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*/
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void fifo_reset(fifo_t fifo);
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/*
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* get data size in the fifo
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*/
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unsigned int fifo_len(fifo_t fifo);
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/*
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* get fifo's empty space.
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*/
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unsigned int fifo_empty(fifo_t fifo);
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#ifdef __cplusplus
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}
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#endif
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#endif
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