CubeMX配置DAC雙通道輸出電壓和任意波形

一、相關函數

HAL_StatusTypeDef HAL_DAC_SetValue(DAC_HandleTypeDef* hdac, uint32_t Channel, uint32_t Alignment, uint32_t Data)//設置DAC輸出電壓值
HAL_StatusTypeDef HAL_DAC_Start(DAC_HandleTypeDef* hdac, uint32_t Channel)//使能DAC通道
uint32_t HAL_DAC_GetValue(DAC_HandleTypeDef* hdac, uint32_t Channel)//獲取相應通道的輸出值
HAL_StatusTypeDef HAL_DAC_Stop(DAC_HandleTypeDef* hdac, uint32_t Channel);
HAL_StatusTypeDef HAL_DAC_Start_DMA(DAC_HandleTypeDef* hdac, uint32_t Channel, uint32_t* pData, uint32_t Length, uint32_t Alignment);
HAL_StatusTypeDef HAL_DAC_Stop_DMA(DAC_HandleTypeDef* hdac, uint32_t Channel);

二、輸出電壓

比較簡單，直接上代碼

int main(void)
{

  HAL_Init();

  SystemClock_Config();


  MX_GPIO_Init();
  MX_DAC_Init();
  MX_UART4_Init();

    HAL_DAC_SetValue(&hdac,DAC_CHANNEL_1,DAC_ALIGN_8B_R,128);
    HAL_DAC_SetValue(&hdac,DAC_CHANNEL_2,DAC_ALIGN_8B_R,255);
    HAL_DAC_Start(&hdac,DAC_CHANNEL_1);
    HAL_DAC_Start(&hdac,DAC_CHANNEL_2);

  while (1)
  {
        printf("DAC-Channel 1 : %d\\r\\n",HAL_DAC_GetValue(&hdac,DAC_CHANNEL_1));
        printf("DAC-Channel 2 : %d\\r\\n\\n",HAL_DAC_GetValue(&hdac,DAC_CHANNEL_2));
        HAL_Delay(1000);         
  }
}

三、定時器觸發DAC+DMA輸出任意波形

（1）配置TIM6，話不多說，10ms觸發一次，即100HZ。 如下圖：

（2）配置DAC，比較簡單，不多說，注意使能DMA：

（3）編程實現

int main(void)
{
        const uint16_t CH_value[32] = {    2448,2832,3186,3496,3751,3940,4057,4095,
                                                                        4057,3940,3751,3496,3186,2832,2448,2048,
                                                                        1648,1264,910,600,345,156,39,0,39,156,345,
                                                                        600,910,1264,1648,2048};
    
        HAL_Init();

        SystemClock_Config();

        MX_GPIO_Init();
        MX_DMA_Init();
        MX_DAC_Init();
        MX_UART4_Init();
        MX_TIM6_Init();

        HAL_TIM_Base_Start(&htim6);
        HAL_DAC_Start_DMA(&hdac,DAC_CHANNEL_1,(uint32_t *)CH_value,32,DAC_ALIGN_12B_R);
        
        while (1)
        {
                printf("DAC->Channel1 : %d\\r\\n",HAL_DAC_GetValue(&hdac,DAC_CHANNEL_1));
                HAL_Delay(10);
        }
}

四、定時器觸發DAC+DMA輸出三波形

（1）CubeMX配置

最大三角波幅(Maximum Triangle Amplitude)為4095，即為3.3V（參考電壓為3.3V）

（2）編程實現

1 void MX_DAC_Init(void)
 2 {
 3   DAC_ChannelConfTypeDef sConfig = {0};
 4 
 5   /** DAC Initialization 
 6   */
 7   hdac.Instance = DAC;
 8   if (HAL_DAC_Init(&hdac) != HAL_OK)
 9   {
10     Error_Handler();
11   }
12   /** DAC channel OUT1 config 
13   */
14   sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
15   sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
16   if (HAL_DAC_ConfigChannel(&hdac, &sConfig, DAC_CHANNEL_1) != HAL_OK)
17   {
18     Error_Handler();
19   }
20   /** DAC channel OUT2 config 
21   */
22   if (HAL_DAC_ConfigChannel(&hdac, &sConfig, DAC_CHANNEL_2) != HAL_OK)
23   {
24     Error_Handler();
25   }
26   /** Configure Triangle wave generation on DAC OUT2 
27   */
28   if (HAL_DACEx_TriangleWaveGenerate(&hdac, DAC_CHANNEL_2, DAC_TRIANGLEAMPLITUDE_4095) != HAL_OK)
29   {
30     Error_Handler();
31   }
32 
33 }
34 
35 
36 
37 int main(void)
38 {
39   /* USER CODE BEGIN 1 */
40     const uint16_t CH_value[32] = {    2448,2832,3186,3496,3751,3940,4057,4095,
41                                                                         4057,3940,3751,3496,3186,2832,2448,2048,
42                                                                         1648,1264,910,600,345,156,39,0,39,156,345,
43                                                                         600,910,1264,1648,2048};
44   /* USER CODE END 1 */
45   
46 
47   /* MCU Configuration--------------------------------------------------------*/
48 
49   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
50   HAL_Init();
51 
52   /* USER CODE BEGIN Init */
53 
54   /* USER CODE END Init */
55 
56   /* Configure the system clock */
57   SystemClock_Config();
58 
59   /* USER CODE BEGIN SysInit */
60 
61   /* USER CODE END SysInit */
62 
63   /* Initialize all configured peripherals */
64   MX_GPIO_Init();
65   MX_DMA_Init();
66   MX_DAC_Init();
67   MX_UART4_Init();
68   MX_TIM6_Init();
69   /* USER CODE BEGIN 2 */
70     HAL_TIM_Base_Start(&htim6);
71     HAL_DAC_Start_DMA(&hdac,DAC_CHANNEL_1,(uint32_t *)CH_value,32,DAC_ALIGN_12B_R);
72     HAL_DAC_Start(&hdac,DAC_CHANNEL_2);
73   /* USER CODE END 2 */
74 
75   /* Infinite loop */
76   /* USER CODE BEGIN WHILE */
77   while (1)
78   {
79     /* USER CODE END WHILE */
80         printf("DAC Channel 1 ------> %d\\r\\n",HAL_DAC_GetValue(&hdac,DAC_CHANNEL_1));
81         printf("DAC Channel 2 ------> %d\\r\\n\\n",HAL_DAC_GetValue(&hdac,DAC_CHANNEL_2));
82         HAL_Delay(10);
83     /* USER CODE BEGIN 3 */
84   }
85   /* USER CODE END 3 */
86 }