怎么实现用DMA把数据从串口232发到存储器啊。。。

wazhzyb

如题，做的是火哥DMA这一章节的每课一问的题目，我把响应的配置改了之后没有反应啊。。。。！

wazhzyb

串口的接收中断需要开启吗？脑袋好晕啊。。

相津童

要使能串口的DMA请求

wazhzyb

相津童 发表于 2016-9-9 16:34
要使能串口的DMA请求

串口的中断需要打开吗?

flyleaf

wazhzyb 发表于 2016-9-13 11:21
串口的中断需要打开吗?

不需要开中断也可以用dma的，要使能dma通道，使能dma接收请求

wazhzyb

flyleaf 发表于 2016-9-13 18:50
不需要开中断也可以用dma的，要使能dma通道，使能dma接收请求

是啊,两个中断都不开的话就能接收,但是我一开dma中断收都收不到了...不知道为什么....
我加了DMA_IT_Config函数,打开dma_it_tc,然后中断函数里检测,然而根本就没进中断..

wazhzyb

这是NVIC和串口DMA的配置..
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  
  /* Configure one bit for preemption priority */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
  
  /* ÅäÖÃÖD¶ÏÔ′ */
  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

void USART2_DMA_Config(void)
{
        DMA_InitTypeDef DMA_InitStructure;

        RCC_AHB1PeriphClockCmd(DEBUG_USART_DMA_CLK, ENABLE);

        DMA_DeInit(DEBUG_USART_DMA_STREAM);

  while (DMA_GetCmdStatus(DEBUG_USART_DMA_STREAM) != DISABLE);

        /*usart2 Rx dma1,channel4,stream5*/       
  DMA_InitStructure.DMA_Channel = DEBUG_USART_DMA_CHANNEL;  
  
  DMA_InitStructure.DMA_PeripheralBaseAddr = DEBUG_USART_DR_BASE;         

  DMA_InitStructure.DMA_Memory0BaseAddr = (u32)RecvBuff;

  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;       
         
  DMA_InitStructure.DMA_BufferSize = BUFF_SIZE;
      
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;       
       
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;       
  
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;// DMA_Mode_Circular;        //
  
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;      
  
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
       
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;   
       
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;   
  
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;   
            
  DMA_Init(DEBUG_USART_DMA_STREAM, &DMA_InitStructure);

        //¿aÆôDMAêy¾Y·￠Ëííê3éÖD¶Ï
        DMA_ITConfig(DEBUG_USART_DMA_STREAM,DMA_IT_TC,ENABLE);
  //Çå±êÖ¾
        DMA_ClearITPendingBit(DEBUG_USART_DMA_STREAM,DMA_IT_TCIF5);
        //¿aÆô′®¿ú½óêÕÇëÇó
        USART_DMACmd(RS232_USART, USART_DMAReq_Rx, ENABLE);
        //¿aÆôDMA
  DMA_Cmd(DEBUG_USART_DMA_STREAM, ENABLE);
       
  /* μè′yDMAá÷óDD§*/
  while(DMA_GetCmdStatus(DEBUG_USART_DMA_STREAM) != ENABLE);
       
        USART_Cmd(RS232_USART, ENABLE);
}
void USART2_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;
               
  RCC_AHB1PeriphClockCmd( RS232_USART_RX_GPIO_CLK|RS232_USART_TX_GPIO_CLK, ENABLE);

  /* ê1Äü USART2 ê±Öó */
  RCC_APB1PeriphClockCmd(RS232_USART_CLK, ENABLE);
  
  /* ᬽó PXx μ½ USARTx_Tx*/
  GPIO_PinAFConfig(RS232_USART_RX_GPIO_PORT,RS232_USART_RX_SOURCE, RS232_USART_RX_AF);

  /*  á¬½ó PXx μ½ USARTx__Rx*/
  GPIO_PinAFConfig(RS232_USART_TX_GPIO_PORT,RS232_USART_TX_SOURCE,RS232_USART_TX_AF);

  /* ÅäÖÃTxòy½ÅÎa¸′óÃ1|Äü  */
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

  GPIO_InitStructure.GPIO_Pin = RS232_USART_TX_PIN  ;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(RS232_USART_TX_GPIO_PORT, &GPIO_InitStructure);

  /* ÅäÖÃRxòy½ÅÎa¸′óÃ1|Äü */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Pin = RS232_USART_RX_PIN;
  GPIO_Init(RS232_USART_RX_GPIO_PORT, &GPIO_InitStructure);
                       
  /* ÅäÖÃ′®¿úRS232_USART Ä￡ê½ */
  USART_InitStructure.USART_BaudRate = RS232_USART_BAUDRATE;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No ;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_Init(RS232_USART, &USART_InitStructure);
        //USART_ITConfig(RS232_USART, USART_IT_RXNE, ENABLE);
  
}


///Öض¨Ïòc¿aoˉêyprintfμ½′®¿úRS232_USART￡¬Öض¨Ïòoó¿éê1óÃprintfoˉêy
int fputc(int ch, FILE *f)
{
                /* ·￠Ëíò»¸ö×Ö½úêy¾Yμ½′®¿úRS232_USART */
                USART_SendData(RS232_USART, (uint8_t) ch);
               
                /* μè′y·￠Ëííê±Ï */
                while (USART_GetFlagStatus(RS232_USART, USART_FLAG_TXE) == RESET);               
       
                return (ch);
}
/*********************************************END OF FILE**********************/

wazhzyb

这是中断函数,不晓得为什么一直进不去
extern uint8_t Rxflag;
       
void DMA1_Stream5_IRQHandler(void)
{
        LED_WHITE;
        if(DMA_GetITStatus(DMA1_Stream5,DMA_IT_TCIF5) == SET)
        {
                Rxflag=1;
                LED1_TOGGLE;
                DMA_ClearITPendingBit(DEBUG_USART_DMA_STREAM,DMA_IT_TCIF5);
        }
}

wazhzyb

这个是main.....
uint8_t Rxflag=0;

extern uint8_t RecvBuff[BUFF_SIZE];

int main(void)
{
        uint16_t i=0;
        uint8_t buff[BUFF_SIZE];
       
        memset(RecvBuff,0,BUFF_SIZE);
       
        LED_GPIO_Config();
  
        NVIC_Configuration();
       
        USART2_Config();
       
        USART2_DMA_Config();       
       
        printf("ÕaêÇò»¸ö′®¿úDMA½óêÕêμÑé!\n");       

  while(1)
        {
                if(Rxflag)
                {       
                        memset(buff,0,BUFF_SIZE);
                        memcpy(buff,RecvBuff,BUFF_SIZE);
                        for(i=0;(strlen(buff)!=0) && (buff[i]!= 0x00);i++)
                        {       
                                printf("%c",buff[i]);
                        }
                }
                Rxflag=0;
        }
}

wazhzyb

哪位大哥能帮下小弟看下哪里的错误吗,我已经被折磨了2天了.......东西也不多可是为什么用电脑通过串口向F4发送数据就是不出结果呢....