嵌入式C語言資料結構之迴圈佇列

佇列擁有先進先出特性，類似生活中的排隊場景，多應用於緩衝區的設計等。

迴圈佇列就是當front或者rear即將產生陣列越界時，將其置為0。

本文用陣列實現迴圈佇列，感興趣的朋友也可以用鍊錶實現迴圈佇列。

以下為原始碼。

queue.h

#ifndef __queue_h__

#define __queue_h__
#include "stm32f10x.h"
#include #define maxqueuelength 20
#define loopqueue
typedef struct
queuenode;
typedef unsigned int queuestate;
queuestate queue_init(queuenode * phead);
queuestate queue_isempytorfull(queuenode * phead);
queuestate queue_addvalue(queuenode * phead,const uint32_t value);
queuestate queue_output(queuenode * phead, uint32_t *pbuffer , uint32_t nbytes);
#endif

#include "queue.h"

/**  * @name   queue_init.
* @brief  init my queue.
* @param  listnode * phead: head of the queue.
* @retval 0               : succeed.
1               : head of queue is null
* @author jiao wo yi sheng xiao ming ge.
* @date   2018.5.30
**/queuestate queue_init(queuenode * phead)
/**  * @name   queue_isempytorfull.
* @brief  get the queue state.
* @param  listnode * phead: head of the queue.
* @retval 0               : not full or empty.
1								: the queue is empyt.
2               : the queue is full.
3								: head of queue is null
* @author jiao wo yi sheng xiao ming ge.
* @date   2018.5.30
**/queuestate queue_isempytorfull(queuenode * phead)
return 0;	
}/**
* @name   queue_addvalue.
* @brief  add value to the queue.
* @param  listnode     * phead: head of the queue.
const uint32_t value: value added to the queue
* @retval 0                   : succeed.
1					    			: the queue is full.
2                   : head of queue is null.
* @author jiao wo yi sheng xiao ming ge.
* @date   2018.5.30
**/queuestate queue_addvalue(queuenode * phead, const uint32_t value)
static queuestate queue_outvalue(queuenode * phead, uint32_t *pbuffer)
/**  * @name   queue_output.
* @brief  output values in queue to buffer.
* @param  listnode * phead  : head of the queue.
uint32_t * pbuffer: value added to the queue.if it's null,then clear the queue.
const uint32_t nbytes:output bytes numbers.
* @retval 0                   : succeed.
1                   : head of queue is null.
2					    			: length of output bytes is beyond queue.
* @author jiao wo yi sheng xiao ming ge.
* @date   2018.5.30
**/queuestate queue_output(queuenode * phead, uint32_t *pbuffer , uint32_t nbytes)
else
queue_init(phead);
return 0;
}

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