fifo.h

[詳解]

/** @file
    @brief      汎用リングバッファ

    @date       2017.09.07
    @date       2002.03.24
    @author     Takashi SHUDO
*/

#ifndef FIFO_H
#define FIFO_H

struct st_fifo {
        unsigned char   *buf;   ///< バッファのポインタ
        unsigned int    size;   ///< バッファのサイズ
        unsigned char   *wp;    ///< 書き込みデータのポインタ
        unsigned char   *rp;    ///< 読み込みデータのポインタ
};      ///< 汎用FIFO

extern void init_fifo(struct st_fifo *fp, unsigned char *buf, unsigned int size);
extern int write_fifo(struct st_fifo *fp, unsigned char *data, unsigned int length);
extern int read_fifo(struct st_fifo *fp, unsigned char *data, unsigned int length);
extern void clear_fifo(struct st_fifo *fp);
extern unsigned int fifo_size(struct st_fifo *fp);
extern unsigned int fifo_free_size(struct st_fifo *fp);
extern int drop_fifo(struct st_fifo *fp, unsigned int length);

#endif  // FIFO_H