2019年03月06日 | stm32 环形缓冲区

/*========================ringbuff.H========================================*/

#ifndef __RingBuff__H

#define USER_RINGBUFF 1 //使用环形缓冲区形式接收数据

#if USER_RINGBUFF

/**如果使用环形缓冲形式接收串口数据***/

#define RINGBUFF_LEN 200 /*最好是2^N,此时就可以进行用取模运算 https://www.cnblogs.com/rechen/p/5143841.html*/

#define FLASE 1

#define TRUE 0

#define TIMEOUT 3

typedef struct

{

u16 Head; //消费者模型，从队头删除

u16 Tail; //生产者模型，从队尾添加

u16 Lenght; //接收数据的长度为ringBuff.Lenght=Ring_Buff.Tail-Ring_Buff.Head

u8 Ring_Buff[RINGBUFF_LEN];

}RingBuff_t;

typedef struct

{

bool bTimeoutCountEn;

bool bTimeout;

u16 Timeoutcount;

u16 Timelimt; //一般为几个字符传送的时间

}Timeout_t;

void RingBuff_Init(void);

u8 Write_RingBuff(u8 data);

u8 Read_RingBuff(u8 *rData);

#endif //end of USER_RINGBUFF

#endif //end of __RingBuff__H

/*========================ringbuff.c========================================*/

#include "ringbuff.h"

RingBuff_t ringBuff;//创建一个ringBuff的缓冲区

Timeout_t RcvTimeout={0,0,0,TIMEOUT};

void RingBuff_Init(void)

{

//初始化相关信息

ringBuff.Head = 0;

ringBuff.Tail = 0;

ringBuff.Lenght = 0;

}

/**

*

*

*

* 说明：被接收中断函数调用

*/

u8 Write_RingBuff(u8 data)

{

#if 0

//if((ringBuff.Tail -ringBuff.Head)== RINGBUFF_LEN) //判断缓冲区是否已满

if(ringBuff.Lenght== RINGBUFF_LEN)

{

return FLASE;

}

ringBuff.Ring_Buff[(ringBuff.Tail++)&(MRINGBUFF_LEN-1)] = data //前提.Tail和.Head数据类型是unsigned int，且MRINGBUFF_LEN是2的词幂,ringBuff.Lenght=Ring_Buff.Tail-Ring_Buff.Head

#else

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+1)%RINGBUFF_LEN;//防止越界非法访问

#endif

ringBuff.Lenght++;

return TRUE;

}

/**

*

*

*

* 说明：原则上不用做接收完成的判断，当缓冲区读都不可读时会有提醒

*/

u8 Read_RingBuff(u8 *rData)

{

#if 0

//if((ringBuff.Tail -ringBuff.Head)== 0) //判断缓冲区是否已空

if(ringBuff.Lenght==0)

{

return FLASE;

}

*rData =ringBuff.Ring_Buff[(ringBuff.Head++)&(MRINGBUFF_LEN-1)]; //前提.Tail和.Head数据类型是unsigned int，且MRINGBUFF_LEN是2的词幂,ringBuff.Lenght=Ring_Buff.Tail-Ring_Buff.Head

#else

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+1)%RINGBUFF_LEN;//防止越界非法访问

#endif

ringBuff.Lenght--;

return TRUE;

}

void USART1_IRQHandler(void)

{

if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //接收中断

{

USART_ClearITPendingBit(USART1,USART_IT_RXNE); //清楚标志位

Write_RingBuff(USART_ReceiveData(USART1)); //读取接收到的数据

RcvTimeout.bTimeoutCountEn =1;

RcvTimeout.Timeoutcount=0;

}

}

void TIM3_IRQHandler(void)

{

if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源

{

TIM_ClearITPendingBit(TIM3, TIM_IT_Update );

if(RcvTimeout.bTimeoutCountEn)

{

if(++RcvTimeout.Timeoutcount == RcvTimeout.Timelimt)

{

RcvTimeout.bTimeoutCountEn=0;

RcvTimeout.Timeoutcount=0;

RcvTimeout.bTimeout=1; //接收完成判断

}

}

}

}