数组的循环存入与读取

#define MAXLEN 19 unsigned int ReadPtr = 0;//定义读指针 unsigned int WritePtr = 0;//定义写指针 int Arr[MAXLEN] = {0};//读取的数组

1、循环写入缓冲区

unsigned int BufAdd(int data) { Arr[*WritePtr] = data;//数据写入缓冲区 *WritePtr = ((*WritePtr) + 1) % MAXLEN;//指针+1 return 1; //Ok }

2、计算缓冲区空闲可写个数

unsigned int EmptyNum(void) { unsigned int Num = 0; Num = (ReadPtr + MAXLEN - WritePtr)%(Maxlen ); return Num; }