传输大数据量异常

2万 · 2021-6-17 21:51

STM32F205RE SPI DMA
为了提高传输效率我使用 SPI 的 DMA 模式进行传输，测试过程中将 MISO 和 MOSI 短接，直接发送和接收。当数据量为 256 个的时候发送和接收一致。当时数据量为300 的时候后面的20个数据就异常了

2万 · 2021-6-17 21:54

GPIO_InitTypeDef GPIO_InitStructure;
      SPI_InitTypeDef  SPI_InitStructure;
      DMA_InitTypeDef  DMA_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      int ii =0;

      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
      /*!< Enable SPI2 clocks */
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
      /*!< Enable GPIO clocks */
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
      /*!< Connect SPI pins to AF5 */
      GPIO_PinAFConfig(GPIOB, GPIO_PinSource13,GPIO_AF_SPI2);
      GPIO_PinAFConfig(GPIOB, GPIO_PinSource14,GPIO_AF_SPI2);
      GPIO_PinAFConfig(GPIOB, GPIO_PinSource15,GPIO_AF_SPI2);

      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN;
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
      GPIO_Init(GPIOB, &GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//GPIO_PuPd_NOPULL;
      GPIO_Init(GPIOB, &GPIO_InitStructure);
      Cdfinger_BspCs_HIGH();
      //Cdfinger_Bspdelay_ms(1);
  //Cdfinger_BspCs_LOW();
      SPI_Cmd(SPI2,DISABLE);
      SPI_DeInit(SPI2);
      SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
      SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
      SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
      SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
      SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
      SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;//;
      SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
      SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
      SPI_InitStructure.SPI_CRCPolynomial = 7;
      SPI_Init(SPI2, &SPI_InitStructure);

  memset(&cdfingerimgtxbuf[0],0x55,COMMUNICATIONLEN);
      /* DMA1 Stream0 channel4 spi tx configuration **************************************/
      DMA_DeInit(DMA1_Stream4);
      DMA_InitStructure.DMA_Channel = DMA_Channel_0;
      DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(SPI2->DR);
      DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&cdfingerimgtxbuf[0];
      DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
      DMA_InitStructure.DMA_BufferSize = COMMUNICATIONLEN;
      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_InitStructure.DMA_Priority = DMA_Priority_High;//DMA_Priority_Medium;//DMA_Priority_High;
      DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;//;//DMA_FIFOMode_Enable;
      DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
      DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
      DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
      DMA_Init(DMA1_Stream4, &DMA_InitStructure);

      /* DMA1 Stream0 channel3 spi rx configuration **************************************/
      DMA_DeInit(DMA1_Stream3);
      DMA_InitStructure.DMA_Channel = DMA_Channel_0;
      DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(SPI2->DR);
      DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&cdfingerimgrxbuf[0];//(uint32_t)&cdfingerimgrxbuf[0];
      DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
      DMA_InitStructure.DMA_BufferSize =COMMUNICATIONLEN;
      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_High;//DMA_Priority_Medium;
      DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;//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(DMA1_Stream3, &DMA_InitStructure);
      //Cdfinger_BspCs_HIGH();

      //发送中断
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
      NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream4_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      //接收中断
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
      NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream3_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x04;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      //SPI_TIModeCmd(SPI2,ENABLE);
      SPI_Cmd(SPI2, ENABLE);
      DMA_ITConfig(DMA1_Stream4,DMA_IT_TC,ENABLE);
      DMA_ITConfig(DMA1_Stream3,DMA_IT_TC,ENABLE);

  SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx|SPI_I2S_DMAReq_Rx, ENABLE);
      DMA_Cmd(DMA1_Stream4, ENABLE);
  DMA_Cmd(DMA1_Stream3, ENABLE);

void DMA1_Stream4_IRQHandler(void)
{
  if(DMA_GetITStatus(DMA1_Stream4,DMA_IT_TCIF4) != RESET)
  {
            DMA_ClearITPendingBit(DMA1_Stream4,DMA_IT_TCIF4);
      DMA_ClearFlag(DMA1_Stream4,DMA_IT_TCIF4);
  }
}

void DMA1_Stream3_IRQHandler(void)
{
  if(DMA_GetITStatus(DMA1_Stream3,DMA_IT_TCIF3) != RESET)
  {
            DMA_ClearITPendingBit(DMA1_Stream3,DMA_IT_TCIF3);
      DMA_ClearFlag(DMA1_Stream3,DMA_IT_TCIF3);
  }
}

1万 · 2021-6-17 21:56

cdfingerimgtxbuf这个数组有没有越界？

2万 · 2021-6-17 21:59

这个单片机DMA传输个数的寄存器是不是8位的，导致超过256溢出了？

2万 · 2021-6-17 22:01

请问一下你说的这个数组越界是什么意思，应该不存在这个情况。我看DMA的说明能传 65535 个数据。

1万 · 2021-6-17 22:03

我想问的是，你SPI与DMA发送与接收的这个两个数组的大小是多少的？会不会溢出了？

1万 · 2021-6-17 22:06

COMMUNICATIONLEN，这个是传进来的变量么？

1万 · 2021-6-17 22:09

是什么类型的数据？

1万 · 2021-6-17 22:12

建议你结合官方相关例程看看手册，弄清原理。

1万 · 2021-6-17 22:15

你现在DMA配置为NORMAL模式，你定义的存储数据的内存大小总有个边界的。

1万 · 2021-6-17 22:17

目的地址指针配置：
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
改成disable，是不是就正常了？如果正常说明内存指针越界。

1万 · 2021-6-17 22:18

channel3目的地址指针设置：
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
改成disable，是不是就正常了？如果正常说明内存指针越界。

1万 · 2021-6-17 22:20

速度太快了？

1万 · 2021-6-17 22:28

好像SPI有回环测试吧。

2万 · 2021-6-17 22:30

建议楼主加上间隔。

2万 · 2021-6-17 22:32

想错了，STM32可以CAN回环测试

1万 · 2021-6-17 22:34

不是256的问题吗

1万 · 2021-6-17 22:37

有可能是程序判定问题

2万 · 2021-6-17 22:39

嗯，我再好好缕一缕吧，有了好消息及时通知大家

只看该作者 · 2021-6-28 15:43

SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; 你把8位改成16位试一下