STM32042 SPI1 SAVE模式接受发送数据问题

Gohome_soon · 发表于 2016-11-23 13:24:06

本帖最后由 Gohome_soon 于 2016-11-23 13:24 编辑

最近在调试stm32f042 spi 从模式时遇到一些问题

如下图，黄色是发送，另外两个是时钟和042发送数据0XA1，
示波器打波形发现数据个别出现如红色圈出部分
本应该是低电平，确出现了比低电平高，比高电平低的现象，
另外一段ARM接受到的数据个别也有0xA1变成0xA7

QQ图片20161123131133.jpg

SPI 接受DMA程序如下；
[mw_shl_code=c,true]u8 RxBuff;
void SPI1_Init(void)
{
  SPI_InitTypeDef  SPI_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
      //NVIC_InitTypeDef NVIC_InitStructure;
      DMA_InitTypeDef  DMA_InitStructure;

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

  GPIO_PinAFConfig(GPIOA,GPIO_PinSource5,GPIO_AF_0);
      GPIO_PinAFConfig(GPIOA,GPIO_PinSource6,GPIO_AF_0);
  GPIO_PinAFConfig(GPIOA,GPIO_PinSource7,GPIO_AF_0);

      /*!< Configure SPI_FLASH_SPI pins: SCK */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_InitStructure.GPIO_OType  = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_Speed  = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

  /*!< Configure SPI_FLASH_SPI pins: MISO */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

  /*!< Configure SPI_FLASH_SPI pins: MOSI */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_InitStructure.GPIO_OType  = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_Speed  = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

  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_Hard;
      SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
      SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

      SPI_Init(SPI1, &SPI_InitStructure);
      /* Initialize the FIFO threshold */
  SPI_RxFIFOThresholdConfig(SPI1, SPI_RxFIFOThreshold_QF);

      SPI_Cmd(SPI1, ENABLE);
//       SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);


      /* Enable the DMA peripheral */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

      /* DMA Configuration -------------------------------------------------------*/
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  DMA_InitStructure.DMA_MemoryDataSize =  DMA_MemoryDataSize_Byte;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

      /* DMA channel Rx of SPI Configuration */
      DMA_InitStructure.DMA_BufferSize = RxLen;
      DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(SPI1->DR);
      DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)RxData;
      DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
      DMA_InitStructure.DMA_Priority = DMA_Priority_High;
      DMA_Init(DMA1_Channel2, &DMA_InitStructure);



      /* Enable the SPI Rx and Tx DMA requests */
      SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE);
//       SPI_I2S_DMACmd(SPIx, SPI_I2S_DMAReq_Tx, ENABLE);


      /* Enable the DMA channels */
      DMA_Cmd(DMA1_Channel2, ENABLE);
//       DMA_Cmd(SPIx_TX_DMA_CHANNEL, ENABLE);

}[/mw_shl_code]

[mw_shl_code=c,true]int main(void)
{
      u32 i;
      SystemInit();
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

      SYSCFG->CFGR1 |= SYSCFG_CFGR1_PA11_PA12_RMP;

      USBD_Init(&USB_Device_dev,
                        &USR_desc,
                        &USBD_CDC_cb,
                        &USR_cb);


      LED_GPIO_Config();

      SPI1_Init();

      USART_Config();
      printf("\r\nSystem Init......\r\n");

      while (1)
      {

            if(DMA_GetFlagStatus(DMA1_FLAG_TC2) == SET)//接受数据完成，
            {
                     printf("%2X\r\n",*(u32*)RxData);
                     if(*(u32*)RxData==0xFFCB5656)
                     {
                              SPI_SendData8(SPI1,0xC1);
                              i++;
                     }
                     *(u16*)RxData=0xFFFF;
                     DMA_ClearFlag(DMA1_FLAG_GL2);//清除DMA完成标志
                     DMA1_Channel2->CCR&=~(1<<0);    //关闭DMA传输
                     DMA1_Channel2->CNDTR=RxLen; //DMA1,传输数据量
                     DMA1_Channel2->CCR|=1<<0;       //开启DMA传输
            }
}
}[/mw_shl_code]

042 SPI1 速度不是应该最高有12M啥，可是我使用042 从模式DMA接受速度只有3.5M，在快接受数据就出错了，