我试图在 B-L475E-IOT01A 开发板的 STM32L475VG 上获得一个使用 DAC 的非常简单的示例。我用 STM32CubeMX 生成了下面的代码,用于 STM32CubeIDE。我可以看到 DAC 寄存器值发生变化,并且 LD1 闪烁,但无法在任何输出引脚 A3-A5 上接收到信号(用于 OPAMP 放大信号或任一 DAC 通道)。
我想我忽略了一些配置细节,但我不知道是什么!任何见解将不胜感激。
干杯,
布雷特
- /* Includes ------------------------------------------------------------------*/
- #include "main.h"
- /* Private includes ----------------------------------------------------------*/
- /* USER CODE BEGIN Includes */
- /* USER CODE END Includes */
- /* Private typedef -----------------------------------------------------------*/
- /* USER CODE BEGIN PTD */
- /* USER CODE END PTD */
- /* Private define ------------------------------------------------------------*/
- /* USER CODE BEGIN PD */
- /* USER CODE END PD */
- /* Private macro -------------------------------------------------------------*/
- /* USER CODE BEGIN PM */
- /* USER CODE END PM */
- /* Private variables ---------------------------------------------------------*/
- DAC_HandleTypeDef hdac1;
- OPAMP_HandleTypeDef hopamp1;
- /* USER CODE BEGIN PV */
- /* USER CODE END PV */
- /* Private function prototypes -----------------------------------------------*/
- void SystemClock_Config(void);
- static void MX_GPIO_Init(void);
- static void MX_DAC1_Init(void);
- static void MX_OPAMP1_Init(void);
- /* USER CODE BEGIN PFP */
- /* USER CODE END PFP */
- /* Private user code ---------------------------------------------------------*/
- /* USER CODE BEGIN 0 */
- /* USER CODE END 0 */
- /**
- * @brief The application entry point.
- * @retval int
- */
- int main(void)
- {
- /* USER CODE BEGIN 1 */
- /* USER CODE END 1 */
- /* MCU Configuration--------------------------------------------------------*/
- /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
- HAL_Init();
- /* USER CODE BEGIN Init */
- /* USER CODE END Init */
- /* Configure the system clock */
- SystemClock_Config();
- /* USER CODE BEGIN SysInit */
- /* USER CODE END SysInit */
- /* Initialize all configured peripherals */
- MX_GPIO_Init();
- MX_DAC1_Init();
- MX_OPAMP1_Init();
- /* USER CODE BEGIN 2 */
- /* USER CODE END 2 */
- /* Infinite loop */
- /* USER CODE BEGIN WHILE */
- // initialize variables for the DACs
- uint8_t triangle=0, rising=1, saw=0;
- uint32_t data=0;
- #define TRI_CHANNEL DAC_CHANNEL_1
- #define SAW_CHANNEL DAC_CHANNEL_2 // we can observe the saw wave on LED1
- // start the DACs
- HAL_DAC_Start(&hdac1, DAC_CHANNEL_1);
- HAL_DAC_Start(&hdac1, DAC_CHANNEL_2);
- while (1)
- {
- /* USER CODE END WHILE */
- /* USER CODE BEGIN 3 */
- // PART 1
- if (HAL_GPIO_ReadPin(B2_GPIO_Port, B2_Pin)) {
- // if the pin value is true, then the button IS NOT pressed (pull-up by default)
- HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
- } else {
- // if the pin value is false, then the button IS pressed (button connects to GND)
- HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_SET);
- } // if-else
- // PART 2
- // check if it's time for the triangle wave to decrease
- if (triangle == UINT8_MAX+1 - 32)
- rising = 0;
- if (triangle == 0)
- rising = 1;
- // C2 freqeuency is 65 Hz, or with a period of 15 ms. We could
- // divide into 16 steps as an approximation.
- // update triangle and saw values
- // triangle rises and falls, and must complete the cycle in 16 steps
- if (rising)
- triangle += 32;
- else
- triangle -= 32;
- // saw rises and then overflows; a cycle must be completed in 16 steps
- saw += 16;
- // write a value for the triangle wave
- HAL_DAC_SetValue(&hdac1, TRI_CHANNEL, DAC_ALIGN_8B_R, triangle);
- data = HAL_DAC_GetValue(&hdac1, TRI_CHANNEL);
- HAL_DAC_SetValue(&hdac1, SAW_CHANNEL, DAC_ALIGN_8B_R, saw);
- data = HAL_DAC_GetValue(&hdac1, SAW_CHANNEL);
- // wait for 1 ms
- HAL_Delay(1);
- }
- /* USER CODE END 3 */
- }
- /**
- * @brief System Clock Configuration
- * @retval None
- */
- void SystemClock_Config(void)
- {
- RCC_OscInitTypeDef RCC_OscInitStruct = {0};
- RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
- /** Initializes the CPU, AHB and APB busses clocks
- */
- RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
- RCC_OscInitStruct.MSIState = RCC_MSI_ON;
- RCC_OscInitStruct.MSICalibrationValue = 0;
- RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
- RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
- RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
- RCC_OscInitStruct.PLL.PLLM = 1;
- RCC_OscInitStruct.PLL.PLLN = 40;
- RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
- RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
- RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
- if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
- {
- Error_Handler();
- }
- /** Initializes the CPU, AHB and APB busses clocks
- */
- 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_DIV1;
- RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
- if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
- {
- Error_Handler();
- }
- /** Configure the main internal regulator output voltage
- */
- if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
- {
- Error_Handler();
- }
- }
- /**
- * @brief DAC1 Initialization Function
- * @param None
- * @retval None
- */
- static void MX_DAC1_Init(void)
- {
- /* USER CODE BEGIN DAC1_Init 0 */
- /* USER CODE END DAC1_Init 0 */
- DAC_ChannelConfTypeDef sConfig = {0};
- /* USER CODE BEGIN DAC1_Init 1 */
- /* USER CODE END DAC1_Init 1 */
- /** DAC Initialization
- */
- hdac1.Instance = DAC1;
- if (HAL_DAC_Init(&hdac1) != HAL_OK)
- {
- Error_Handler();
- }
- /** DAC channel OUT1 config
- */
- sConfig.DAC_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE;
- sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
- sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
- sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_ENABLE;
- sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY;
- if (HAL_DAC_ConfigChannel(&hdac1, &sConfig, DAC_CHANNEL_1) != HAL_OK)
- {
- Error_Handler();
- }
- /** DAC channel OUT2 config
- */
- sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_ENABLE;
- if (HAL_DAC_ConfigChannel(&hdac1, &sConfig, DAC_CHANNEL_2) != HAL_OK)
- {
- Error_Handler();
- }
- /* USER CODE BEGIN DAC1_Init 2 */
- /* USER CODE END DAC1_Init 2 */
- }
- /**
- * @brief OPAMP1 Initialization Function
- * @param None
- * @retval None
- */
- static void MX_OPAMP1_Init(void)
- {
- /* USER CODE BEGIN OPAMP1_Init 0 */
- /* USER CODE END OPAMP1_Init 0 */
- /* USER CODE BEGIN OPAMP1_Init 1 */
- /* USER CODE END OPAMP1_Init 1 */
- hopamp1.Instance = OPAMP1;
- hopamp1.Init.PowerSupplyRange = OPAMP_POWERSUPPLY_LOW;
- hopamp1.Init.Mode = OPAMP_PGA_MODE;
- hopamp1.Init.NonInvertingInput = OPAMP_NONINVERTINGINPUT_DAC_CH;
- hopamp1.Init.InvertingInput = OPAMP_INVERTINGINPUT_IO0;
- hopamp1.Init.PgaGain = OPAMP_PGA_GAIN_2;
- hopamp1.Init.PowerMode = OPAMP_POWERMODE_NORMAL;
- hopamp1.Init.UserTrimming = OPAMP_TRIMMING_FACTORY;
- if (HAL_OPAMP_Init(&hopamp1) != HAL_OK)
- {
- Error_Handler();
- }
- /* USER CODE BEGIN OPAMP1_Init 2 */
- /* USER CODE END OPAMP1_Init 2 */
- }
- /**
- * @brief GPIO Initialization Function
- * @param None
- * @retval None
- */
- static void MX_GPIO_Init(void)
- {
- GPIO_InitTypeDef GPIO_InitStruct = {0};
- /* GPIO Ports Clock Enable */
- __HAL_RCC_GPIOC_CLK_ENABLE();
- __HAL_RCC_GPIOA_CLK_ENABLE();
- __HAL_RCC_GPIOB_CLK_ENABLE();
- /*Configure GPIO pin Output Level */
- HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
- /*Configure GPIO pin : B2_Pin */
- GPIO_InitStruct.Pin = B2_Pin;
- GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
- GPIO_InitStruct.Pull = GPIO_NOPULL;
- HAL_GPIO_Init(B2_GPIO_Port, &GPIO_InitStruct);
- /*Configure GPIO pin : LED_Pin */
- GPIO_InitStruct.Pin = LED_Pin;
- GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
- GPIO_InitStruct.Pull = GPIO_NOPULL;
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
- HAL_GPIO_Init(LED_GPIO_Port, &GPIO_InitStruct);
- }
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