DMA双向传输 stm32F407

约定不等于承诺〃 2022-05-09 21:23 318阅读 0赞

#define SEND_BUF_SIZE 80 //·¢ËÍÊý¾Ý³¤¶È,×îºÃµÈÓÚsizeof(TEXT_TO_SEND)+2µÄÕûÊý±¶.
    #define Receice_BUF_SIZE 80 //·¢ËÍÊý¾Ý³¤¶È,×îºÃµÈÓÚsizeof(TEXT_TO_SEND)+2µÄÕûÊý±¶.
    
    
    u8 SendBuff[SEND_BUF_SIZE];	//·¢ËÍÊý¾Ý»º³åÇø
    u8 ReceiceBuff[Receice_BUF_SIZE];	//·¢ËÍÊý¾Ý»º³åÇø
    const u8 TEXT_TO_SEND[]={ "ALIENTEK Explorer STM32F4 DMA ´®¿ÚÊµÑé"};	 
    
      /*wdh¸Ä³ÉDMA´«Êä¡£*/
    /* 1¡¢µ÷ÊÔDMA2³ÌÐòÊÇ·ñÕýÈ·¡£ok 2¡¢¸Ä³ÉDMA2ÅäÖÃ£¬´Ó´æ´¢Æ÷µ½ÍâÉè¡£ok 3¡¢¸Ä³ÉDMA2ÅäÖÃ£¬´ÓÍâÉèµ½´æ´¢Æ÷¡£ok 3¡¢Ë«ÏòÍ¬Ê±´«Êä ok ×¢ÒâË«Ïò´«ÊäµÄ Ê±ºò£¬Òª¼ÇµÃË«ÏòÅäÖÃ£¬ÅäÖÃÒ»¸ö·¢ËÍº¯ÊýºÍÒ»¸ö½ÓÊÕº¯Êý£¬´«Êä·½Ïò²»Ò»Ñù¼´¿É¡£¡¢¡¢ ×¢Òâ´®¿ÚµÄÊý¾ÝÁ÷ºÍÍ¨µÀ²»Ò»Ñù£¬¶ÔÓÚ´®¿ÚÀ´Ëµ¡£Ò»¶¨Òª×¢Òâ¡£ */
    int main(void)
    {  
    	u16 i;
    	u8 t=0;
    	u8 j,mask=0;
    	float pro=0;//½ø¶È
    	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//ÉèÖÃÏµÍ³ÖÐ¶ÏÓÅÏÈ¼¶·Ö×é2
    	delay_init(168);     //³õÊ¼»¯ÑÓÊ±º¯Êý
    	uart_init(115200);	//³õÊ¼»¯´®¿Ú²¨ÌØÂÊÎª115200
    	LED_Init();					//³õÊ¼»¯LED 
    	KEY_Init(); 				//°´¼ü³õÊ¼»¯ 
     	 MYDMA_Config_Tx(DMA2_Stream7,DMA_Channel_4,(u32)&USART1->DR,(u32)SendBuff,SEND_BUF_SIZE);//DMA2,STEAM7,CH4,ÍâÉèÎª´®¿Ú1,´æ´¢Æ÷ÎªSendBuff,³¤¶ÈÎª:SEND_BUF_SIZE.
     	 MYDMA_Config_Rx(DMA2_Stream5,DMA_Channel_4,(u32)&USART1->DR,(u32)ReceiceBuff,Receice_BUF_SIZE);//DMA1,STEAM7,CH5,ÍâÉèÎª´®¿Ú1,´æ´¢Æ÷ÎªSendBuff,³¤¶ÈÎª:SEND_BUF_SIZE.
     //ÏÔÊ¾ÌáÊ¾ÐÅÏ¢ 
    	j=sizeof(TEXT_TO_SEND);	   
    	for(i=0;i<SEND_BUF_SIZE;i++)//Ìî³äASCII×Ö·û¼¯Êý¾Ý
        { 
    		if(t>=j)//¼ÓÈë»»ÐÐ·û
    		{ 
    			if(mask)
    			{ 
    				SendBuff[i]=0x0a;
    				t=0;
    			}else 
    			{ 
    				SendBuff[i]=0x0d;
    				mask++;
    			}	
    		}else//¸´ÖÆTEXT_TO_SENDÓï¾ä
    		{ 
    			mask=0;
    			SendBuff[i]=TEXT_TO_SEND[t];
    			t++;
    		}   	   
        }		 
     
    	i=0;
    	while(1)
    	{ 
    		printf("\r\nDMA DATA:\r\n"); 	          
    		USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE);  //Ê¹ÄÜ´®¿Ú1µÄDMA·¢ËÍ 
    		USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE);  //Ê¹ÄÜ´®¿Ú1µÄDMA½ÓÊÕ 
    		MYDMA_Enable(DMA2_Stream7,SEND_BUF_SIZE);     //¿ªÊ¼Ò»´ÎDMA´«Êä£¡ 
    		MYDMA_Enable(DMA2_Stream5,Receice_BUF_SIZE);     //¿ªÊ¼Ò»´ÎDMA´«Êä£¡
    		while(1)
    		{ 
    			//µÈ´ýDMA´«ÊäÍê³É£¬´ËÊ±ÎÒÃÇÀ´×öÁíÍâÒ»Ð©ÊÂ£¬µãµÆ
    		   //Êµ¼ÊÓ¦ÓÃÖÐ£¬´«ÊäÊý¾ÝÆÚ¼ä£¬¿ÉÒÔÖ´ÐÐÁíÍâµÄÈÎÎñ 
    		  if(DMA_GetFlagStatus(DMA2_Stream5,DMA_FLAG_TCIF5)!=RESET)//µÈ´ýDMA2_Steam7´«ÊäÍê³É
    			{  
    				printf("ReceiceBuff[] = %s\r\n",ReceiceBuff);
    				DMA_ClearFlag(DMA2_Stream5,DMA_FLAG_TCIF5);//Çå³ýDMA2_Steam7´«ÊäÍê³É±êÖ¾
    				break; 
    			}
    			if(DMA_GetFlagStatus(DMA2_Stream7,DMA_FLAG_TCIF7)!=RESET)//µÈ´ýDMA2_Steam7´«ÊäÍê³É
    			{  
    				DMA_ClearFlag(DMA2_Stream7,DMA_FLAG_TCIF7);//Çå³ýDMA2_Steam7´«ÊäÍê³É±êÖ¾
    				//break; 
    			}
    			pro=DMA_GetCurrDataCounter(DMA2_Stream7);//µÃµ½µ±Ç°»¹Ê£Óà¶àÉÙ¸öÊý¾Ý
    			pro=1-pro/SEND_BUF_SIZE;//µÃµ½°Ù·Ö±È 
    			pro*=100;      			    //À©´ó100±¶ 
    			printf("pro = %f\r\n",pro);
    			LED0=!LED0;
    		}				
    	}    	
    		        		    
    }
    
    
    函数配置
    
    
    //DMAxµÄ¸÷Í¨µÀÅäÖÃ
    //ÕâÀïµÄ´«ÊäÐÎÊ½ÊÇ¹Ì¶¨µÄ,ÕâµãÒª¸ù¾Ý²»Í¬µÄÇé¿öÀ´ÐÞ¸Ä
    //´Ó´æ´¢Æ÷->ÍâÉèÄ£Ê½/8Î»Êý¾Ý¿í¶È/´æ´¢Æ÷ÔöÁ¿Ä£Ê½
    //DMA_Streamx:DMAÊý¾ÝÁ÷,DMA1_Stream0~7/DMA2_Stream0~7
    //chx:DMAÍ¨µÀÑ¡Ôñ,@ref DMA_channel DMA_Channel_0~DMA_Channel_7
    //par:ÍâÉèµØÖ·
    //mar:´æ´¢Æ÷µØÖ·
    //ndtr:Êý¾Ý´«ÊäÁ¿ 
    void MYDMA_Config_Rx(DMA_Stream_TypeDef *DMA_Streamx,u32 chx,u32 par,u32 mar,u16 ndtr)
    {  
     
    	DMA_InitTypeDef  DMA_InitStructure;
    	
    	if((u32)DMA_Streamx>(u32)DMA2)//µÃµ½µ±Ç°streamÊÇÊôÓÚDMA2»¹ÊÇDMA1
    	{ 
    	  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);//DMA2Ê±ÖÓÊ¹ÄÜ 
    		
    	}else 
    	{ 
    	  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);//DMA1Ê±ÖÓÊ¹ÄÜ 
    	}
      DMA_DeInit(DMA_Streamx);
    	
    	while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){ }//µÈ´ýDMA¿ÉÅäÖÃ 
    	
      /* ÅäÖÃ DMA Stream */
      DMA_InitStructure.DMA_Channel = chx;  //Í¨µÀÑ¡Ôñ
      DMA_InitStructure.DMA_PeripheralBaseAddr = par;//DMAÍâÉèµØÖ·
      DMA_InitStructure.DMA_Memory0BaseAddr = mar;//DMA ´æ´¢Æ÷0µØÖ·
      //DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;//´æ´¢Æ÷µ½ÍâÉèÄ£Ê½
    		
    	DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//ÍâÉèµ½´æ´¢Æ÷Ä£Ê½
    		
      DMA_InitStructure.DMA_BufferSize = ndtr;//Êý¾Ý´«ÊäÁ¿ 
      DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//ÍâÉè·ÇÔöÁ¿Ä£Ê½
      DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//´æ´¢Æ÷ÔöÁ¿Ä£Ê½
      DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//ÍâÉèÊý¾Ý³¤¶È:8Î»
      DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;//´æ´¢Æ÷Êý¾Ý³¤¶È:8Î»
      DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;// Ê¹ÓÃÆÕÍ¨Ä£Ê½ 
      DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//ÖÐµÈÓÅÏÈ¼¶
      DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
      DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
      DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//´æ´¢Æ÷Í»·¢µ¥´Î´«Êä
      DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//ÍâÉèÍ»·¢µ¥´Î´«Êä
      DMA_Init(DMA_Streamx, &DMA_InitStructure);//³õÊ¼»¯DMA Stream
    	
    
    } 
    void MYDMA_Config_Tx(DMA_Stream_TypeDef *DMA_Streamx,u32 chx,u32 par,u32 mar,u16 ndtr)
    {  
     
    	DMA_InitTypeDef  DMA_InitStructure;
    	
    	if((u32)DMA_Streamx>(u32)DMA2)//µÃµ½µ±Ç°streamÊÇÊôÓÚDMA2»¹ÊÇDMA1
    	{ 
    	  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);//DMA2Ê±ÖÓÊ¹ÄÜ 
    		
    	}else 
    	{ 
    	  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);//DMA1Ê±ÖÓÊ¹ÄÜ 
    	}
      DMA_DeInit(DMA_Streamx);
    	
    	while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){ }//µÈ´ýDMA¿ÉÅäÖÃ 
    	
      /* ÅäÖÃ DMA Stream */
      DMA_InitStructure.DMA_Channel = chx;  //Í¨µÀÑ¡Ôñ
      DMA_InitStructure.DMA_PeripheralBaseAddr = par;//DMAÍâÉèµØÖ·
      DMA_InitStructure.DMA_Memory0BaseAddr = mar;//DMA ´æ´¢Æ÷0µØÖ·
      DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;//´æ´¢Æ÷µ½ÍâÉèÄ£Ê½
      DMA_InitStructure.DMA_BufferSize = ndtr;//Êý¾Ý´«ÊäÁ¿ 
      DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//ÍâÉè·ÇÔöÁ¿Ä£Ê½
      DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//´æ´¢Æ÷ÔöÁ¿Ä£Ê½
      DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//ÍâÉèÊý¾Ý³¤¶È:8Î»
      DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;//´æ´¢Æ÷Êý¾Ý³¤¶È:8Î»
      DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;// Ê¹ÓÃÆÕÍ¨Ä£Ê½ 
      DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//ÖÐµÈÓÅÏÈ¼¶
      DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
      DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
      DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//´æ´¢Æ÷Í»·¢µ¥´Î´«Êä
      DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//ÍâÉèÍ»·¢µ¥´Î´«Êä
      DMA_Init(DMA_Streamx, &DMA_InitStructure);//³õÊ¼»¯DMA Stream
    	
    
    } 
    //¿ªÆôÒ»´ÎDMA´«Êä
    //DMA_Streamx:DMAÊý¾ÝÁ÷,DMA1_Stream0~7/DMA2_Stream0~7 
    //ndtr:Êý¾Ý´«ÊäÁ¿ 
    void MYDMA_Enable(DMA_Stream_TypeDef *DMA_Streamx,u16 ndtr)
    { 
     
    	DMA_Cmd(DMA_Streamx, DISABLE);                      //¹Ø±ÕDMA´«Êä 
    	
    	while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){ }	//È·±£DMA¿ÉÒÔ±»ÉèÖÃ 
    		
    	DMA_SetCurrDataCounter(DMA_Streamx,ndtr);          //Êý¾Ý´«ÊäÁ¿ 
     
    	DMA_Cmd(DMA_Streamx, ENABLE);                      //¿ªÆôDMA´«Êä 
    }