SPI4、SPI5双CPU交互时丢帧率高于1%

自由鸟358 · 发表于 2019-12-17 12:03:57

目前系统运行情况为，每48ms发送300字节，接收300字节，分三次，分别在15ms，25ms，35ms执行，每次100字节，两个CPU对接，都是SPI4发送，SPI5接收，目前发现丢帧率高于1%，有什么解决办法吗，或者说这个丢帧率正常吗，是否是因为速率配置太高，利用率低？SPI配置如下
  /* SPI5 init function */
static void MX_SPI5_Init(void)
{
  hspi5.Instance = SPI5;
  hspi5.Init.Mode = SPI_MODE_SLAVE;
  hspi5.Init.Direction = SPI_DIRECTION_2LINES_RXONLY;
  hspi5.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi5.Init.NSS = SPI_NSS_HARD_INPUT;
  hspi5.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64;
  hspi5.Init.TIMode = SPI_TIMODE_ENABLE;
  hspi5.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi5.Init.CRCPolynomial = 7;
  hspi5.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
  hspi5.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
  if (HAL_SPI_Init(&hspi5) != HAL_OK)
  {
_Error_Handler(__FILE__, __LINE__);
  }
}
/* SPI4 init function */
static void MX_SPI4_Init(void)
{
  hspi4.Instance = SPI4;
  hspi4.Init.Mode = SPI_MODE_MASTER;
  hspi4.Init.Direction = SPI_DIRECTION_2LINES;
  hspi4.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi4.Init.NSS = SPI_NSS_HARD_OUTPUT;
  hspi4.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64;
  hspi4.Init.TIMode = SPI_TIMODE_ENABLE;
  hspi4.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi4.Init.CRCPolynomial = 7;
  hspi4.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
  hspi4.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
  if (HAL_SPI_Init(&hspi4) != HAL_OK)
  {
_Error_Handler(__FILE__, __LINE__);
  }
}

配合的DMA配置如下
/**
  * Enable DMA controller clock
  */
static void MX_DMA_Init(void)
{
  /* DMA controller clock enable */
  __HAL_RCC_DMA2_CLK_ENABLE();

  /* DMA interrupt init */
  /* DMA2_Stream1_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA2_Stream1_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA2_Stream1_IRQn);
  /* DMA2_Stream3_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA2_Stream3_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA2_Stream3_IRQn);
}