无法使用SPI与DAC通信

Question

我正在尝试使用STM32L4控制器中的SPI与DAC通信。我基本上是想测试SPI线路是否工作正常，例如，我是否能够分别向DAC发送数据和从DAC接收数据。我已按如下方式配置了DAC引脚-

static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOH_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

    GPIO_InitStruct.Pin = RST_Pin|M_Z_Pin|TC_SB_Pin|LDAC_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = PD_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = SPI3_Chip_Select_DAC_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /*Configure GPIO pins : READY_Pin LDAC_Pin BUSY_Pin */
  GPIO_InitStruct.Pin = READY_Pin|BUSY_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    HAL_GPIO_WritePin(RST_GPIO_Port,RST_Pin,GPIO_PIN_SET);
    HAL_GPIO_WritePin(M_Z_GPIO_Port,M_Z_Pin,GPIO_PIN_RESET);
    HAL_GPIO_WritePin(TC_SB_GPIO_Port,TC_SB_Pin,GPIO_PIN_SET);
    HAL_GPIO_WritePin(LDAC_GPIO_Port,LDAC_Pin,GPIO_PIN_RESET);
    HAL_GPIO_WritePin(PD_GPIO_Port,PD_Pin,GPIO_PIN_RESET);
    HAL_GPIO_WritePin(SPI3_Chip_Select_DAC_GPIO_Port,SPI3_Chip_Select_DAC_Pin,GPIO_PIN_SET);



}

我想要读取状态寄存器的内容，我必须在SPI线路上向其发送0xC0 (如数据手册中所指定)。作为回报，DAC返回状态寄存器的内容。因此，我为它编写了以下代码-

SPI_HandleTypeDef hspi1;
SPI_HandleTypeDef hspi2;
SPI_HandleTypeDef hspi3;

TIM_HandleTypeDef htim3;

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USB_OTG_FS_USB_Init(void);
static void MX_SPI1_Init(void);
static void MX_SPI2_Init(void);
static void MX_SPI3_Init(void);
static void MX_TIM3_Init(void);
uint8_t received_data[3],Data_to_send[3];
int main(void)
{
  HAL_Init();
  /* Configure the system clock */
  SystemClock_Config();
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_SPI1_Init();
  MX_SPI2_Init();
  MX_SPI3_Init();
  MX_TIM3_Init();

    while(1)
    {
         HAL_GPIO_WritePin(SPI3_Chip_Select_DAC_GPIO_Port,SPI3_Chip_Select_DAC_Pin,GPIO_PIN_RESET);
     HAL_Delay(1);
     Data_for_try[0]=0xC0;
         HAL_SPI_TransmitReceive(&hspi3,Data_to_send,received_data,3,100);
         HAL_Delay(1);
         HAL_GPIO_WritePin(SPI3_Chip_Select_DAC_GPIO_Port,SPI3_Chip_Select_DAC_Pin,GPIO_PIN_SET);

    }

}

但我无法从DAC拿回任何数据作为确认。我已检查SPI_CLOCK和SPI_MOSI引脚是否正在使用示波器接收信号。有没有办法检查DAC是否工作正常？

Answer 1

谢谢你的支持，但我还是解决了问题。我必须更改SPI设置，如下所示-

static void MX_SPI3_Init(void)
{
  /* SPI3 parameter configuration*/
  hspi3.Instance = SPI3;
  hspi3.Init.Mode = SPI_MODE_MASTER;
  hspi3.Init.Direction = SPI_DIRECTION_2LINES;
  hspi3.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi3.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi3.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi3.Init.NSS = SPI_NSS_SOFT;
  hspi3.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
  hspi3.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi3.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi3.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi3.Init.CRCPolynomial = 7;
  hspi3.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
  hspi3.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
  if (HAL_SPI_Init(&hspi3) != HAL_OK)
  {
    Error_Handler();
  }
}

hspi3.Init.DataSize被初始化为SPI_DATASIZE_4BIT，而不是SPI_DATASIZE_8BIT，这是问题所在。