arm - 使用 DMA 问题 STM32F0 LL 驱动程序通过 SPI 传输数据

Question

我目前正在开发一个项目，将应用程序的数据从 STM32F030c8 芯片发送到树莓派，问题是当我启用 spi 以使用 DMA 并尝试传输时，数据似乎没有发送。这是我目前所做的工作，STM 充当 SLAVE 设备，并在为 DMA 通道调用 IRQ 处理程序时尝试传输。

IRQ 处理程序

void DMA1_Channel4_5_IRQHandler(void)
{
  /* USER CODE BEGIN DMA1_Channel4_5_IRQn 0 */
  /* USER CODE END DMA1_Channel4_5_IRQn 0 */
  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
  GPIO_InitStruct.Pin = LL_GPIO_PIN_8;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_UP;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_0;
  LL_GPIO_Init(GPIOC, &GPIO_InitStruct);
  prexfer();
  /* USER CODE BEGIN DMA1_Channel4_5_IRQn 1 */

  /* USER CODE END DMA1_Channel4_5_IRQn 1 */
}

RX + TX 缓冲器

struct _jd_frame_t {
    uint8_t data[JD_SERIAL_PAYLOAD_SIZE + 4];
} __attribute__((__packed__, aligned(4)));
typedef struct _jd_frame_t jd_frame_t;

jd_frame_t tempSend, tempRecv;

程序开始将虚拟数据放入 tempSend，设置 SPI+DMA RX

/* USER CODE END 2 */
  tempSend.data[0] = 100;
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  setupReceive(&tempRecv, sizeof(tempRecv));
  while (1)
  {
    /* USER CODE END WHILE */
    /* USER CODE BEGIN 3 */
    // setup transfer
  }

开始接收数据的 Rx 设置方法

void setupReceive(const void *receive, uint32_t numbytes){
  /* Reset the threshold bit */
    CLEAR_BIT(SPI2->CR2, SPI_CR2_LDMATX | SPI_CR2_LDMARX);
  // Reception setup
    LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_4, (uint32_t) & (SPI2->DR), (uint32_t) receive,
                           LL_DMA_DIRECTION_PERIPH_TO_MEMORY);
    LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_4, numbytes);
    // Enable SPI
    LL_SPI_EnableDMAReq_RX(SPI2);
    LL_SPI_Enable(SPI2);
    LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_4);
}

SPI + DMA 传输方式

void prexfer(){
  xfer(&tempSend, &tempRecv, sizeof(tempSend));
}

void xfer(const void *send, const void *receive, uint32_t numbytes){
  /* Reset the threshold bit */
    CLEAR_BIT(SPI2->CR2, SPI_CR2_LDMATX | SPI_CR2_LDMARX);
  // Reception setup
    LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_4, (uint32_t) & (SPI2->DR), (uint32_t) receive,
                           LL_DMA_DIRECTION_PERIPH_TO_MEMORY);
    LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_4, numbytes);
  // Transfer setup
    LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_5, (uint32_t) send, (uint32_t) & (SPI2->DR),
                           LL_DMA_DIRECTION_MEMORY_TO_PERIPH);
    LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_5, numbytes);
  // Enable SPI
    LL_SPI_EnableDMAReq_RX(SPI2);
    LL_SPI_EnableDMAReq_TX(SPI2);
    LL_SPI_Enable(SPI2);
    LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_4);
    LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_5);
}

DMA + SPI 设置

static void MX_SPI2_Init(void)
{

  LL_SPI_InitTypeDef SPI_InitStruct = {0};

  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* Peripheral clock enable */
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_SPI2);
  LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOB);
  LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOC);
  /**SPI2 GPIO Configuration
  PB12   ------> SPI2_NSS
  PB13   ------> SPI2_SCK
  PB14   ------> SPI2_MISO
  PB15   ------> SPI2_MOSI
  */
  GPIO_InitStruct.Pin = LL_GPIO_PIN_12 | LL_GPIO_PIN_13 | LL_GPIO_PIN_14 | LL_GPIO_PIN_15;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_0;
  LL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /* SPI2 DMA Init */

  /* SPI2_RX Init */
  LL_DMA_SetDataTransferDirection(DMA1, LL_DMA_CHANNEL_4, LL_DMA_DIRECTION_PERIPH_TO_MEMORY);
  LL_DMA_SetChannelPriorityLevel(DMA1, LL_DMA_CHANNEL_4, LL_DMA_PRIORITY_LOW);
  LL_DMA_SetMode(DMA1, LL_DMA_CHANNEL_4, LL_DMA_MODE_NORMAL);
  LL_DMA_SetPeriphIncMode(DMA1, LL_DMA_CHANNEL_4, LL_DMA_PERIPH_NOINCREMENT);
  LL_DMA_SetMemoryIncMode(DMA1, LL_DMA_CHANNEL_4, LL_DMA_MEMORY_INCREMENT);
  LL_DMA_SetPeriphSize(DMA1, LL_DMA_CHANNEL_4, LL_DMA_PDATAALIGN_BYTE);
  LL_DMA_SetMemorySize(DMA1, LL_DMA_CHANNEL_4, LL_DMA_MDATAALIGN_BYTE);

  /* SPI2_TX Init */
  LL_DMA_SetDataTransferDirection(DMA1, LL_DMA_CHANNEL_5, LL_DMA_DIRECTION_MEMORY_TO_PERIPH);
  LL_DMA_SetChannelPriorityLevel(DMA1, LL_DMA_CHANNEL_5, LL_DMA_PRIORITY_LOW);
  LL_DMA_SetMode(DMA1, LL_DMA_CHANNEL_5, LL_DMA_MODE_NORMAL);
  LL_DMA_SetPeriphIncMode(DMA1, LL_DMA_CHANNEL_5, LL_DMA_PERIPH_NOINCREMENT);
  LL_DMA_SetMemoryIncMode(DMA1, LL_DMA_CHANNEL_5, LL_DMA_MEMORY_INCREMENT);
  LL_DMA_SetPeriphSize(DMA1, LL_DMA_CHANNEL_5, LL_DMA_PDATAALIGN_BYTE);
  LL_DMA_SetMemorySize(DMA1, LL_DMA_CHANNEL_5, LL_DMA_MDATAALIGN_BYTE);

  /* USER CODE BEGIN SPI2_Init 1 */

  /* USER CODE END SPI2_Init 1 */
  /* SPI2 parameter configuration*/
  SPI_InitStruct.TransferDirection = LL_SPI_FULL_DUPLEX;
  SPI_InitStruct.Mode = LL_SPI_MODE_SLAVE;
  SPI_InitStruct.DataWidth = LL_SPI_DATAWIDTH_4BIT;
  SPI_InitStruct.ClockPolarity = LL_SPI_POLARITY_LOW;
  SPI_InitStruct.ClockPhase = LL_SPI_PHASE_1EDGE;
  SPI_InitStruct.NSS = LL_SPI_NSS_HARD_INPUT;
  SPI_InitStruct.BitOrder = LL_SPI_MSB_FIRST;
  SPI_InitStruct.CRCCalculation = LL_SPI_CRCCALCULATION_DISABLE;
  SPI_InitStruct.CRCPoly = 7;
  LL_SPI_Init(SPI2, &SPI_InitStruct);
  LL_SPI_SetStandard(SPI2, LL_SPI_PROTOCOL_MOTOROLA);
  LL_SPI_DisableNSSPulseMgt(SPI2);
  /* USER CODE BEGIN SPI2_Init 2 */

  /* USER CODE END SPI2_Init 2 */

}

/**
  * Enable DMA controller clock
  */
static void MX_DMA_Init(void)
{

  /* Init with LL driver */
  /* DMA controller clock enable */
  LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_DMA1);
  /* DMA interrupt init */
  /* DMA1_Channel4_5_IRQn interrupt configuration */
  NVIC_SetPriority(DMA1_Channel4_5_IRQn, 1);
  NVIC_EnableIRQ(DMA1_Channel4_5_IRQn);

}

所以代码应该如何工作的是，当我设置 RX 并从 RPi 接收数据时，它应该调用 DMA1 IRQ 处理程序来传输数据，但它永远不会被调用，非常感谢任何帮助！

标签： armembeddedstm32spidma