STM32

STM32串口DMA发送数据不连续

2019-07-14 14:13发布

站内问答 / STM32/STM8
12577 11 1263
STM32串口DMA发送的数据不连续，已经试了一些办法，仍未解决，不知是什么原因？
用串口监控得到的数据是：
10,9:07:54,io.exe(5532),IRP_MJ_WRITE,COM8,7,        4D 00 01 01 06 00 08  | M#0#1#1#6#0#8,
12,9:07:54,io.exe(5532),IRP_MJ_READ,COM8,1,        4D  | M,
13,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        00  | #0,
14,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        01  | #1,
15,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        23  | #,
16,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        00  | #0,
17,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        03  | #3,
18,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        5C  | ,
19,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        88  | ?,
20,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        00  | #0,
21,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        13  | #19,
22,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        CB  | ?,
23,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        12  | #18,
24,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        00  | #0,
25,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        00  | #0,
26,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        90  | ?,
27,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        D2  | ò,
28,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        07  | #7,
29,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        EE  | ?,
30,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        17  | ,
31,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        E1  | á,
32,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        00  | #0,
33,9:07:56,io.exe(5532),IRP_MJ_READ,COM8,1,        0D  | #13,
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11条回答
cmh4
2019-07-15 06:52
USART串口通讯的代码如下：

void GPIO_Configuration(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOA, &GPIO_InitStructure);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
        GPIO_Init(GPIOA, &GPIO_InitStructure);
}

//串口初始化：
void USART_Configuration(void)
{
        USART_InitTypeDef USART_InitStructure;
        USART_InitStructure.USART_BaudRate = 9600;
        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(USART1, &USART_InitStructure);
        USART_ITConfig(USART1, USART_IT_IDLE , ENABLE);
        USART_Cmd(USART1, ENABLE);  
        USART_ClearFlag(USART1, USART_FLAG_TC); // 清发送完成标志
}       

//DMA配置：
void DMA_Configuration(void)
{
  DMA_InitTypeDef DMA_InitStructure;
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);//DMA1时钟
  DMA_DeInit(DMA1_Channel4);  
  DMA_InitStructure.DMA_PeripheralBaseAddr = 0x40013804;
  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)TX1_SendBuf;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;        //外设作为DMA的目的端
  DMA_InitStructure.DMA_BufferSize = 512;         // 根据实际发送数据长度确定
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;        //外设地址不增加
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                        //内存地址自增1
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//（只传送一次）                        DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;                 //DMA传送优先级
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel4, &DMA_InitStructure);
  DMA_ITConfig(DMA1_Channel4, DMA_IT_TC, ENABLE);
  DMA_ITConfig(DMA1_Channel4, DMA_IT_TE, ENABLE);
  USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);
  DMA_Cmd(DMA1_Channel4, DISABLE);

  DMA_DeInit(DMA1_Channel5);  
  DMA_InitStructure.DMA_PeripheralBaseAddr = 0x40013804;
  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)RX1_RcvBuf;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 512;
  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;//（只传送一次）                       
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;         //DMA传送优先级
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel5, &DMA_InitStructure);
  DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);
  DMA_ITConfig(DMA1_Channel5, DMA_IT_TE, ENABLE);

  USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
  DMA_Cmd(DMA1_Channel5, ENABLE);
}

//中断优先级配置：
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  /* Configure one bit for preemption priority */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);                 //中断分组设置
       
/* Enable the USART1 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;                  //设置串口1中断
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;                 //抢占优先级
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;                                         //响应优先级
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable the USART2 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;                 //抢占优先级 1
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;                                         //响应优先级
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;                //抢占优先级
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;                                        //响应优先级
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

void USART1_IRQHandler(void)        //USART1收发全用DMA
{                 
        u16 DATA_LEN;

        if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)//如果为空闲总线中断
        {
                DMA_Cmd(DMA1_Channel5, DISABLE);
                if(RX1_dataOverflow == 0)         //1=接收的数据超过缓冲区数量
                {
                        DATA_LEN = 512 - DMA_GetCurrDataCounter(DMA1_Channel5); //已经传输的字节数

                        if(RX1_RcvBuf[0] == 'M')//;判断是否为帧头，MODBUS数据接收标志，0x4D='M'
                        {
                                RX1_Data_Len = DATA_LEN;
                                Handle_MODBUS_CMD();
                        }
                        else if(RX1_RcvBuf[0] == 126)//检查USART1的国军标协议接收标志，为1则有命令帧需处理
                        {       
                                HandleCMD()        ;
                        }
                }
                RX1_dataOverflow = 0;         //1=接收的数据超过缓冲区数量

                DMA_ClearFlag(DMA1_FLAG_GL5 | DMA1_FLAG_TC5 | DMA1_FLAG_TE5 | DMA1_FLAG_HT5);//清标志
                DMA1_Channel5->CNDTR = 512;//重装填
                DMA_Cmd(DMA1_Channel5, ENABLE);//处理完,重开DMA
                DATA_LEN = USART1->SR;
                DATA_LEN = USART1->DR;
        }

        if(USART_GetITStatus(USART1, USART_IT_PE | USART_IT_FE | USART_IT_NE) != RESET)//出错
        {
                USART_ClearITPendingBit(USART1, USART_IT_PE | USART_IT_FE | USART_IT_NE);
        }
        USART_ClearITPendingBit(USART1, USART_IT_TC);
        USART_ClearITPendingBit(USART1, USART_IT_IDLE);
}

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