请教调试两块板子STM32 SPI DMA主从通信遇到的问题

阳光&守望者

调试两块板子STM32  SPI DMA主从通信,主机是STM32F107   SPI3 DMA2通道2主机发送时钟和MOSI波形正常，从机stm32f103 SPI2  DMA1通道4第一次接收是对的，以后几次就会出错,仿真按数据看似有规律，每隔几个数据就是对的。这是我主机发送的数组，
#define BufferSize         32
uint8_t SPI_MASTER_Buffer_Tx[BufferSize] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,
                                              0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x10,
                                              0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,
                                              0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,0x20};
从机接收的数据,大家分析一下是什么原因，谢谢

likunxue

这是SPI 数据错位的问题,

阳光&守望者

likunxue 发表于 2016-1-27 14:44
这是SPI 数据错位的问题,

数据错位怎么解决，主从机极性设置都是一样的
主机程序设置:
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_16;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = CRCPolynomial;
  SPI_Init(SPI_MASTER, &SPI_InitStructure);
  
  /* SPI_MASTER_Tx_DMA_Channel configuration ---------------------------------*/
        DMA_DeInit(DMA2_Channel2);
        DMA_InitStructure.DMA_PeripheralBaseAddr =(u32)&SPI3->DR;//SPI1µÄDR¼Ä´æÆ÷µØÖ·
        DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SPI_MASTER_Buffer_Tx;
        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;  //ÍâÉèµØÖ·ÊÇÄ¿µÄµØ
        DMA_InitStructure.DMA_BufferSize = 32;
        DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
        DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;  //DMAÄÚ´æµØÖ·×Ô¶¯Ôö¼Óģʽ
        DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
        DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
        DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;    //Ñ »·Ä£Ê½
        DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
        DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
        DMA_Init(SPI_MASTER_Tx_DMA_Channel, &DMA_InitStructure);

  /* Enable SPI_MASTER DMA Tx request */
  SPI_I2S_DMACmd(SPI_MASTER, SPI_I2S_DMAReq_Tx, ENABLE);
  /* Enable SPI_MASTER CRC calculation */
//  SPI_CalculateCRC(SPI_MASTER, ENABLE);

  /* Enable SPI_MASTER */
  SPI_Cmd(SPI_MASTER, ENABLE);
//        GPIO_ResetBits(GPIOE, GPIO_Pin_1);
  DMA_Cmd(SPI_MASTER_Tx_DMA_Channel, ENABLE);
从机程序设置：
        SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
  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_16;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = CRCPolynomial;
  SPI_Init(SPI_SLAVE, &SPI_InitStructure);

  /* SPI_SLAVE_Rx_DMA_Channel configuration ----------------------------------*/
        
        DMA_DeInit(SPI_SLAVE_Rx_DMA_Channel);
        DMA_InitStructure.DMA_PeripheralBaseAddr =(u32)&SPI2->DR;//SPI2µÄDR¼Ä´æÆ÷µØÖ·
        DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SPI_SLAVE_Buffer_Rx;
        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;  //ÍâÉèµØÖ·ÊÇÄ¿µÄµØ
        DMA_InitStructure.DMA_BufferSize = 32;
        DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
        DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;  //DMAÄÚ´æµØÖ·×Ô¶¯Ôö¼Óģʽ
        DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
        DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
        DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;    //Ñ »·Ä£Ê½
        DMA_InitStructure.DMA_Priority = DMA_Priority_High;
        DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
        DMA_Init(SPI_SLAVE_Rx_DMA_Channel, &DMA_InitStructure);
        
  /* Enable SPI_SLAVE DMA Rx request */
  SPI_I2S_DMACmd(SPI_SLAVE, SPI_I2S_DMAReq_Rx, ENABLE);

  /* Enable SPI_SLAVE CRC calculation */
//  SPI_CalculateCRC(SPI_SLAVE, ENABLE);

  /* Enable SPI_SLAVE */
  SPI_Cmd(SPI_SLAVE, ENABLE);

  DMA_Cmd(SPI_SLAVE_Rx_DMA_Channel, ENABLE);
  
  /* Transfer complete */
//  while(!DMA_GetFlagStatus(SPI_SLAVE_Rx_DMA_FLAG));

正点原子

论坛有网友发过SPI双机通信,搜索,参考.

阳光&守望者

问题解决了，这是DMA机制决定的，程序本身没有错，只要从机不延时接收数据或者保持与主机时钟同步，数据不会出错。谁有更好的控制DMA开关的方法可以讨论一下