ring.h

嵌入式linux学习之uclinux步进电机驱动实例（测试平台S3C44B0X,uclinux系统）

#define RING_SIGNATURE 175DE210	

typedef struct{
	long signuture;
	unsigned char *head_p;	
	unsigned char *tail_p;
	unsigned char *begin_p;
	unsigned char *end_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);