Question

我正在使用Analog Devices波形发生器（AD5930），并尝试使用STM32f767评估板上的spi外设对其进行编程。通过使用SPI的串行时钟将数据以16位字的形式加载到设备寄存器中，可以对波形发生器进行编程。数据字包括寄存器地址（前4位）和命令（后12位）。正确放置了STM32与AD5930的连接，当用示波器检查线路时，我可以看到数据，时钟和控制全部来自电路板。截至目前，我正在尝试使用HAL_SPI_Transmit命令发送8个16位命令字。这是我的 main.c 中包含的内容：

`

HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_SPI1_Init();`

 `HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET);
    HAL_Delay(5);  `

    spiData[0] = 0x0E83;
    spiData[1] = 0x13E8;
    spiData[2] = 0x2000;
    spiData[3] = 0x3800;
    spiData[4] = 0x63E8;
    spiData[5] = 0xC0C5;
    spiData[6] = 0xD002;
    spiData[7] = 0xA3E8;

    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET);
    if((HAL_SPI_Transmit(&hspi1,(uint8_t*)&spiData,8,5)) ==HAL_TIMEOUT){
            HAL_Delay(100);
        }
    while(HAL_SPI_GetState(&hspi1) != HAL_SPI_STATE_READY);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET);
    HAL_Delay(1);


        HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_RESET);       
    HAL_Delay(1);
        HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_SET);
        HAL_Delay(1);`

以下是我的初始化规范：

`

hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_16BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 7;
  hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
  hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
  if (HAL_SPI_Init(&hspi1) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;


  __HAL_RCC_PWR_CLK_ENABLE();

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = 16;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = 16;
  RCC_OscInitStruct.PLL.PLLN = 192;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }


  if (HAL_PWREx_EnableOverDrive() != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }


  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);


  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);


GPIO_InitStruct.Pin = GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_7;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
    HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

  GPIO_InitStruct.Pin = LD3_Pin|LD2_Pin|GPIO_PIN_8;
  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 = GPIO_PIN_4;
  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);

引脚PB8用作控制触发器，以在寄存器编程后开始生成波形；引脚PA5用作SPI时钟； PD7用作SPI数据或MOSI；引脚PA4用作片选。

我在示波器上观察到的（查看时钟+数据时）是正在输入数据，这似乎是正确的，但是当clk停止时却悬空了。我没有收到HAL TIMEOUT错误，因此我的假设是数据已正确格式化以进行传输。当程序继续运行并且触发器（Pin PB8）转换时，我在输出中看不到波形。我的配置可能会导致我无法与AD5930正确通信？

Answer 1

HAL_SPI_Transmit第三个参数是要传输的字节数。您的数据缓冲区包含16个字节（8 * sizeof（uint16）= 8 * 2个字节），但您仅发送8个字节。

如何使用SPI和STM32 HAL库对AD5930进行串行编程？

1 个答案: