Lesson23 DMA操作

//DMAxµÄ¸÷ͨµÀÅäÖÃ
//ÕâÀïµÄ´«ÊäÐÎʽÊǹ̶¨µÄ,ÕâµãÒª¸ù¾Ý²»Í¬µÄÇé¿öÀ´ÐÞ¸Ä
//´Ó´æ´¢Æ÷->ÍâÉèģʽ/8λÊý¾Ý¿í¶È/´æ´¢Æ÷ÔöÁ¿Ä£Ê½
//DMA_Streamx:DMAÊý¾ÝÁ÷,DMA1_Stream0~7/DMA2_Stream0~7
//chx:DMAͨµÀÑ¡Ôñ,@ref DMA_channel DMA_Channel_0~DMA_Channel_7
//par:ÍâÉèµØÖ·
//mar:´æ´¢Æ÷µØÖ·
//ndtr:Êý¾Ý´«ÊäÁ¿  
void MYDMA_Config(DMA_Stream_TypeDef *DMA_Streamx,u32 chx,u32 par,u32 mar,u16 ndtr)
{  DMA_InitTypeDef myDMA;
     //ʹÄÜDMAµÄʱÖÓ
     if((u32)DMA_Streamx>(u32)DMA2)
         RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);
     else
         RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);
     //
     myDMA.DMA_BufferSize=ndtr; //DMA_SxNDTR[15:0] Êý¾Ý´«ÊäÁ¿£¬Ö»ÓнûÖ¹´«ÊäµÄʱºò£¬²ÅÄÜдÈë¡£Æô¶¯´«Êäºó£¬±íʾʣÓàÊý¾ÝÁ¿
     myDMA.DMA_Channel= DMA_Channel_4;            //DMA_SxCR[27:25] ͨµÀÑ¡Ôñ
     myDMA.DMA_DIR=DMA_DIR_MemoryToPeripheral;    //DMA_SxCR[7:6] ´«Êä·½Ïò ´æ´¢Æ÷µ½ÍâÉè
     myDMA.DMA_FIFOMode=DMA_FIFOMode_Disable;     //DMA_SxFCR[2] ʹÄÜÖ±½Óģʽ
     myDMA.DMA_FIFOThreshold=DMA_FIFOThreshold_Full;//DMA_SxFCR[1:0] ʹÓÃÖ±½Óģʽ£¬Õâ¸öÅä²»Å䶼¿ÉÒÔ
     myDMA.DMA_Memory0BaseAddr=mar;               // DMA_SxM0AR[] ´æ´¢Æ÷µØÖ·
     myDMA.DMA_MemoryBurst=DMA_MemoryBurst_Single; // DMA_SxCR[24:23]Í»·¢´«ÊäÅäÖÃ
     myDMA.DMA_MemoryDataSize=DMA_MemoryDataSize_Byte;//DMA_SxCR[14:13] ´æ´¢Æ÷Êý¾Ý´óС
     myDMA.DMA_MemoryInc=DMA_MemoryInc_Enable;          //DMA_SxCR[10] ´æ´¢Æ÷µØÖ·µÝÔö
     myDMA.DMA_Mode= DMA_Mode_Normal  ;  //DMA_SxCR[8]  ½ûֹѭ»·Ä£Ê½
     myDMA.DMA_PeripheralBaseAddr=par;      //ÍâÉèµØÖ· DMA_SxPAR
     myDMA.DMA_PeripheralBurst= DMA_PeripheralBurst_Single; ////DMA_SxCR[22:21] ÍâÉèÍ»·¢ÅäÖÃ
     myDMA.DMA_PeripheralDataSize=DMA_PeripheralDataSize_Byte; //DMA_SxCR[12:11] ÍâÉèÊý¾Ý´óС
     myDMA.DMA_PeripheralInc= DMA_PeripheralInc_Disable; //DMA_SxCR[9]  ÍâÉèµØÖ·¹Ì¶¨
     myDMA.DMA_Priority= DMA_Priority_Medium;//ÖеÈÓÅÏȼ¶ DMA_SxCR[17:16] 
     DMA_Init(DMA_Streamx, &myDMA);  //³õʼ»¯     
    
}


// Íê³ÉÒ»´Î´«Êä
void MYDMA_Enable(DMA_Stream_TypeDef *DMA_Streamx,u16 ndtr)
{ 
    DMA_Cmd(DMA_Streamx,DISABLE);  //¹Ø±ÕDMA´«Êä DMA_SxCR[0] ENλ
    while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){}  //ÔٴζÁENλ£¬È·±£ÊDz»¿É¶ÁµÄ
    DMA_SetCurrDataCounter(DMA_Streamx,ndtr);     //DMA_SxNDTR[15:0]´«ÊäµÄÊý¾ÝÁ¿£¬ÔÙ´Îд
    DMA_Cmd(DMA_Streamx,ENABLE);   //ʹÄÜ
}

#define SEND_BUF_SIZE 8200    //·¢ËÍÊý¾Ý³¤¶È,×îºÃµÈÓÚsizeof(TEXT_TO_SEND)+2µÄÕûÊý±¶.

u8 SendBuff[SEND_BUF_SIZE];    //·¢ËÍÊý¾Ý»º³åÇø
const u8 TEXT_TO_SEND[]={"123456789abcde"};     
  
int main(void)
{ 
    u8 b; 
     
    u16 i;
    u8 t=0;
    u8 j,mask=0;
    float pro=0;//½ø¶È
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//ÉèÖÃϵͳÖжÏÓÅÏȼ¶·Ö×é2
    delay_init(168);     //³õʼ»¯ÑÓʱº¯Êý
    uart_init(115200);    //³õʼ»¯´®¿Ú²¨ÌØÂÊΪ115200
    LED_Init();                    //³õʼ»¯LED 
     LCD_Init();                    //LCD³õʼ»¯ 
    KEY_Init();                 //°´¼ü³õʼ»¯ 
     MYDMA_Config(DMA2_Stream7,DMA_Channel_4,(u32)&USART1->DR,(u32)SendBuff,SEND_BUF_SIZE);//DMA2,STEAM7,CH4,ÍâÉèΪ´®¿Ú1,´æ´¢Æ÷ΪSendBuff,³¤¶ÈΪ:SEND_BUF_SIZE.
    
    POINT_COLOR=RED; 
    LCD_ShowString(30,50,200,16,16,"Explorer STM32F4");    
    LCD_ShowString(30,70,200,16,16,"DMA TEST");    
    LCD_ShowString(30,90,200,16,16,"ATOM@ALIENTEK");
    LCD_ShowString(30,110,200,16,16,"2014/5/6");     
    LCD_ShowString(30,130,200,16,16,"KEY0:Start");     
    POINT_COLOR=BLUE;//ÉèÖÃ×ÖÌåΪÀ¶É«  

    
// //Ìî³äram
//    j=sizeof(TEXT_TO_SEND);       
//    for(i=0;i<SEND_BUF_SIZE;i++)//Ìî³äASCII×Ö·û¼¯Êý¾Ý
//    { 
//        if(t>=j)//¼ÓÈë»»Ðзû
//        {
//            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++;
//        }          
//    }    

  j=sizeof(TEXT_TO_SEND)+1;    
    for(i=0;i<SEND_BUF_SIZE;i++)
    { b= i% j;
        if(b==j-2)
            SendBuff[i]=0x0d;
        if(b==j-1)
            SendBuff[i]=0x0a;
        if(b<j-2)
            SendBuff[i]=TEXT_TO_SEND[b];
    }




        
    POINT_COLOR=BLUE;//ÉèÖÃ×ÖÌåΪÀ¶É«      
    i=0;
    while(1)
    {
        t=KEY_Scan(0);
        if(t==KEY0_PRES)
        { printf("start to transfer date from ram to uart by DMA\r\n");
            USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE);
            MYDMA_Enable(DMA2_Stream7,SEND_BUF_SIZE);
            while(1)
            { if(DMA_GetFlagStatus(DMA2_Stream7,DMA_FLAG_TCIF7)!=RESET)
                   { DMA_ClearFlag(DMA2_Stream7,DMA_FLAG_TCIF7);
                    break;
                     }
             pro=DMA_GetCurrDataCounter(DMA2_Stream7);
             pro=1-pro/SEND_BUF_SIZE;
             pro=pro*100;    
       //delay_ms(20);
       //printf("have already transfer %f percent data",pro);                     
            }
             printf("\r\n transfer finish");
            
        }
    }