#include "fifo.h"

/**
 * @brief  RingBuff_Init
 * @param  void
 * @return void
 * @note   初始化环形缓冲区
 */
void RingBuff_Init(RingBuff_t *ringBuff)
{
   //初始化相关信息
   ringBuff->Head = 0;
   ringBuff->Tail = 0;
   ringBuff->Lenght = 0;
}

/**
 * @brief  Write_RingBuff
 * @param  u8 data
 * @return FLASE:环形缓冲区已满，写入失败;TRUE:写入成功
 * @note   往环形缓冲区写入u8类型的数据
 */
uint8_t Write_RingBuff(RingBuff_t *ringBuff,uint8_t data)
{
   if(ringBuff->Lenght >= RINGBUFF_LEN) //判断缓冲区是否已满
    {
      return FLASE;
    }
    ringBuff->Ring_Buff[ringBuff->Tail]=data;
//    ringBuff.Tail++;
    ringBuff->Tail = (ringBuff->Tail+1)%RINGBUFF_LEN;//防止越界非法访问
    ringBuff->Lenght++;
    return OK;
}


/**
 * @brief  Read_RingBuff
 * @param  u8 *rData，用于保存读取的数据
 * @return FLASE:环形缓冲区没有数据，读取失败;TRUE:读取成
 * @note   从环形缓冲区读取一个u8类型的数据
 */
uint8_t Read_RingBuff(RingBuff_t *ringBuff,uint8_t *rData)
{
   if(ringBuff->Lenght == 0)//判断非空
    {
       return FLASE;
    }
   *rData = ringBuff->Ring_Buff[ringBuff->Head];//先进先出FIFO，从缓冲区头出
//   ringBuff.Head++;
   ringBuff->Head = (ringBuff->Head+1)%RINGBUFF_LEN;//防止越界非法访问
   ringBuff->Lenght--;
   return OK;
}

/**
 * @brief  Read_Length_RingBuff
 * @param  RingBuff_t *ringBuff 
 * @return 
 * @note
 */
uint8_t Read_Length_RingBuff(RingBuff_t *ringBuff)
{
  return ringBuff->Lenght;
}