1、Ping Pong Buffer 原理分析简图描述：A Ping Pong Buffer is a double buffer that is used to speed up a device that can overlap the I/O operation with the data processing operation. One buffer is used to hold a block of data so that a reader device will see a complete (old) version of the data, while in the other buffer a writer device is creating a new (partial) version of data. When the new block of data is complete and self consistent, the reader and the writer device will alternate the two buffers. As a result, the usage of double buffer increases the overall throughput of a device and helps to prevent eventual bottlenecks.————————————————乒乓缓存是一种双缓存机制，用来加速同时存在I/O操作以及数据处理操作的设备
一个缓存用来保存旧版本的数据供读设备读取，与此同时，另一个缓存保存写设备产生的新版本数据
当新数据完成时，读设备和写设备将会交换两个缓存，双缓存机制将会提高设备的吞吐量，最终有助于避免瓶颈的产生 ​2、C++代码实现相关结构体创建 、读和写接口的创建

​typedef struct{void buffer[2];//void buffer[2] 无类型指针，指向不同数据类型的缓冲Buffvolatile uint8_t writeIndex;//volatile uint8_t writeIndex 缓冲写索引volatile uint8_t readIndex;//volatile uint8_t readIndex 缓冲读索引volatile uint8_t readAvaliable[2];//volatile uint8_t readAvaliable[2] 可读标志位} PingPongBuffer_t;/初始化存储管理模块/void PingPongBuffer_Init(PingPongBuffer_t ppbuf, void buf0, void buf1);/读取：获取的缓存/bool PingPongBuffer_GetReadBuf(PingPongBuffer_t ppbuf, void pReadBuf);/读标志：设置读标志/void PingPongBuffer_SetReadDone(PingPongBuffer_t ppbuf);/写入：获取可写位置/void PingPongBuffer_GetWriteBuf(PingPongBuffer_t ppbuf, void pWriteBuf);/设置写完成标志 /void PingPongBuffer_SetWriteDone(PingPongBuffer_t ppbuf);​读写接口的实现所谓ping-pong buffer，也就是定义两个buffer当有数据进来的时候，负责写入buffer的进程就寻找第一个没有被占用而且可写的buffer，进行写入，写好之后，将占用flag释放，同时设置一个flag提示此buffer已经可读，然后再接下去找另外一个可写的buffer，写入新的数据
而读入的进程也是一直对buffer状态进行检测，一旦发现没有被占用，而且已经可以被读，就把这个buffer的数据取出来，然后标志为可写

​/ @brief Ping-pong buffer initialization @param ppbuf: Pointer to the ping-pong buffer structure @param buf0: Pointer to the first buffer @param buf1: Pointer to the second buffer @retval None/void PingPongBuffer_Init(PingPongBuffer_t ppbuf, void buf0, void buf1){memset(ppbuf, 0, sizeof(PingPongBuffer_t));ppbuf->buffer[0] = buf0;ppbuf->buffer[1] = buf1;}/当设备有数据来时1.负责读取buffer的进程就寻找第一个没有被占用而且可读取的buff（ppbuf->readAvaliable==1）2.记录该buff的序号index（等读完后-对该buff设置一个flag提示此buffer已经不可读false）3.读取该索引的buff；将该索引buffer设置不可读// @brief Get a readable buffer @param ppbuf: Pointer to the ping-pong buffer structure @param pReadBuf: Pointer to the pointer to the buffer to be read @retval Returns true if there is a buffer to be read/bool PingPongBuffer_GetReadBuf(PingPongBuffer_t ppbuf, void pReadBuf){/负责读取buffer的进程就寻找第一个没有被占用而且可读取的buff/if(ppbuf->readAvaliable[0]){ppbuf->readIndex = 0;}else if(ppbuf->readAvaliable[1]){ppbuf->readIndex = 1;}else{return false;}/读取该索引的buff/pReadBuf = ppbuf->buffer[ppbuf->readIndex];return true;}/ @brief Notify buffer read completion @param ppbuf: Pointer to the ping-pong buffer structure @retval None/void PingPongBuffer_SetReadDone(PingPongBuffer_t ppbuf){ /将该索引buffer设置不可读/ppbuf->readAvaliable[ppbuf->readIndex] = false;}/当缓存数据要输出时，缓冲区0的数据放入缓冲区1，这时缓冲区0可接收下次数据
工作区可从缓冲区1拿数据然后将缓存0的可读取标志置为true1.如果写索引和读索引都指向一个buff时，将另外一个buff给写索引，并将该索引buff写出如果写索引和读索引不一样，将该索引buff写出2.将该索引的可读标志设置为可读； 将可写的索引指向另外一个缓存// @brief Get writable buffer @param ppbuf: Pointer to the ping-pong buffer structure @param pWriteBuf: Pointer to the pointer to the buffer to be wriye @retval None/void PingPongBuffer_GetWriteBuf(PingPongBuffer_t ppbuf, void pWriteBuf){/如果写索引和读索引都指向一个buff时，将另外一个buff给写索引，并将该索引buff写出/if(ppbuf->writeIndex == ppbuf->readIndex){ppbuf->writeIndex = !ppbuf->readIndex;}/将该索引buff写出/pWriteBuf = ppbuf->buffer[ppbuf->writeIndex];}/ @brief Notify buffer write completion @param ppbuf: Pointer to the ping-pong buffer structure @retval None/void PingPongBuffer_SetWriteDone(PingPongBuffer_t ppbuf){ /将该索引的可读标志设置为可读/ppbuf->readAvaliable[ppbuf->writeIndex] = true;/将可写的索引指向另外一个缓存/ppbuf->writeIndex = !ppbuf->writeIndex;}3.应用​内存申请和释放写入读取

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