os_ring.h

arm_bootloader _flash writter &USB

#ifndef __OS_RING_H__
#define __OS_RING_H__

#define RING_BUFFER_SIZE        (16384)     // The buffer size must be power of 2
#define RING_BUFFER_INDEX_MASK  (RING_BUFFER_SIZE - 1)

#define RING_SUCCESS            (0)
#define RING_FAIL               (-1)

typedef struct ring_buf_s
{
    unsigned char buffer[RING_BUFFER_SIZE];
    unsigned int putindex;
    unsigned int getindex;
    unsigned int buffersize;
} ring_buf_t;

int putring(ring_buf_t *ring, unsigned char src[], unsigned int len);
int putring_char(ring_buf_t *ring, unsigned char c);
int getring(ring_buf_t *ring, unsigned char src[], unsigned int len);
int getring_char(ring_buf_t *ring, unsigned char *c);

void ring_flush(ring_buf_t *ring);

#endif // __OS_RING_H__