一、相关函数
HAL_StatusTypeDef HAL_DAC_SetValue(DAC_HandleTypeDef* hdac, uint32_t Channel, uint32_t Alignment, uint32_t Data)//设置DAC输出电压值 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)//获取相应通道的输出值 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、输出电压
比较简单，直接上代码
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、定时器触发DAC+DMA输出任意波形
（1）配置TIM6，话不多说，10ms触发一次，即100HZ。如下图：
（2）配置DAC，比较简单，不多说，注意使能DMA：
（3）编程实现
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、定时器触发DAC+DMA输出三波形
（1）CubeMX配置
最大三角波幅(Maximum Triangle Amplitude)为4095，即为3.3V（参考电压为3.3V）
（2）编程实现
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 }