ring.h

linux下 步进电机驱动

#define RING_SIGNATURE 0x175DE210

typedef struct {
   long signature;
   unsigned char *head_p;
   unsigned char *tail_p;
   unsigned char *end_p;     /* end + 1 */
   unsigned char *begin_p;
   unsigned char buffer[32768];  
} ring_buffer_t;


extern void ring_buffer_init(ring_buffer_t *ring);
extern int ring_buffer_read(ring_buffer_t *ring, unsigned char *buf, int count);
extern int ring_buffer_write(ring_buffer_t *ring, unsigned char *buf, int count);