我用Cube生成的代码，单纯PWM是可以的。但不知道为什么PWM加上DMA后完全没用，不可控。谁能发个例程给我，或者帮我检查一下我这里例程那里出问题了吗？谢谢了。STM32F030芯片，代码几乎都是用Cube生成的，除了main函数上的几行代码。

1. int main(void)
   
2. {
   
3.   /* USER CODE BEGIN 1 */
   
4.         uint16_t i;
   
5.   /* USER CODE END 1 */
   
6.   
   
7. 
   
8.   /* MCU Configuration--------------------------------------------------------*/
   
9. 
   
10.   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
    
11.   HAL_Init();
    
12. 
    
13.   /* USER CODE BEGIN Init */
    
14. 
    
15.   /* USER CODE END Init */
    
16. 
    
17.   /* Configure the system clock */
    
18.   SystemClock_Config();
    
19. 
    
20.   /* USER CODE BEGIN SysInit */
    
21. 
    
22.   /* USER CODE END SysInit */
    
23. 
    
24.   /* Initialize all configured peripherals */
    
25.   MX_GPIO_Init();
    
26.   MX_TIM3_Init();
    
27.   MX_DMA_Init();
    
28.   /* USER CODE BEGIN 2 */
    
29.         //HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_3);
    
30.        
    
31.        
    
32.         for(i = 0; i < SEND_SIZE; i++)
    
33.         {
    
34.                 pwm_buf[i] = 200;
    
35.         }
    
36.   /* USER CODE END 2 */
    
37. 
    
38.   /* Infinite loop */
    
39.   /* USER CODE BEGIN WHILE */
    
40.   while (1)
    
41.   {
    
42.     /* USER CODE END WHILE */
    
43. 
    
44.     /* USER CODE BEGIN 3 */
    
45.                
    
46.                 HAL_TIM_PWM_Start_DMA(&htim3, TIM_CHANNEL_3, (uint32_t *)(&(pwm_buf[0])), SEND_SIZE*2);
    
47.                 HAL_Delay(200);
    
48.   }
    
49.   /* USER CODE END 3 */
    
50. }

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1. static void MX_TIM3_Init(void)
   
2. {
   
3. 
   
4.   /* USER CODE BEGIN TIM3_Init 0 */
   
5. 
   
6.   /* USER CODE END TIM3_Init 0 */
   
7. 
   
8.   TIM_ClockConfigTypeDef sClockSourceConfig = {0};
   
9.   TIM_MasterConfigTypeDef sMasterConfig = {0};
   
10.   TIM_OC_InitTypeDef sConfigOC = {0};
    
11. 
    
12.   /* USER CODE BEGIN TIM3_Init 1 */
    
13. 
    
14.   /* USER CODE END TIM3_Init 1 */
    
15.   htim3.Instance = TIM3;
    
16.   htim3.Init.Prescaler = 0;
    
17.   htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
    
18.   htim3.Init.Period = 10000;
    
19.   htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    
20.   htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
    
21.   if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
    
22.   {
    
23.     Error_Handler();
    
24.   }
    
25.   sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
    
26.   if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
    
27.   {
    
28.     Error_Handler();
    
29.   }
    
30.   if (HAL_TIM_PWM_Init(&htim3) != HAL_OK)
    
31.   {
    
32.     Error_Handler();
    
33.   }
    
34.   sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
    
35.   sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
    
36.   if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
    
37.   {
    
38.     Error_Handler();
    
39.   }
    
40.   sConfigOC.OCMode = TIM_OCMODE_PWM1;
    
41.   sConfigOC.Pulse = 2;
    
42.   sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
    
43.   sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
    
44.   if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_3) != HAL_OK)
    
45.   {
    
46.     Error_Handler();
    
47.   }
    
48.   __HAL_TIM_DISABLE_OCxPRELOAD(&htim3, TIM_CHANNEL_3);
    
49.   /* USER CODE BEGIN TIM3_Init 2 */
    
50. 
    
51.   /* USER CODE END TIM3_Init 2 */
    
52.   HAL_TIM_MspPostInit(&htim3);
    
53. 
    
54. }

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1. static void MX_DMA_Init(void)
   
2. {
   
3. 
   
4.   /* DMA controller clock enable */
   
5.   __HAL_RCC_DMA1_CLK_ENABLE();
   
6. 
   
7.   /* DMA interrupt init */
   
8.   /* DMA1_Channel2_3_IRQn interrupt configuration */
   
9.   HAL_NVIC_SetPriority(DMA1_Channel2_3_IRQn, 0, 0);
   
10.   HAL_NVIC_EnableIRQ(DMA1_Channel2_3_IRQn);
    
11. 
    
12. }

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1. void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
   
2. {
   
3.   if(htim_base->Instance==TIM3)
   
4.   {
   
5.   /* USER CODE BEGIN TIM3_MspInit 0 */
   
6. 
   
7.   /* USER CODE END TIM3_MspInit 0 */
   
8.     /* Peripheral clock enable */
   
9.     __HAL_RCC_TIM3_CLK_ENABLE();
   
10.   
    
11.     /* TIM3 DMA Init */
    
12.     /* TIM3_CH3 Init */
    
13.     hdma_tim3_ch3.Instance = DMA1_Channel2;
    
14.     hdma_tim3_ch3.Init.Direction = DMA_MEMORY_TO_PERIPH;
    
15.     hdma_tim3_ch3.Init.PeriphInc = DMA_PINC_DISABLE;
    
16.     hdma_tim3_ch3.Init.MemInc = DMA_MINC_ENABLE;
    
17.     hdma_tim3_ch3.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
    
18.     hdma_tim3_ch3.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
    
19.     hdma_tim3_ch3.Init.Mode = DMA_CIRCULAR;
    
20.     hdma_tim3_ch3.Init.Priority = DMA_PRIORITY_VERY_HIGH;
    
21.     if (HAL_DMA_Init(&hdma_tim3_ch3) != HAL_OK)
    
22.     {
    
23.       Error_Handler();
    
24.     }
    
25. 
    
26.     __HAL_LINKDMA(htim_base,hdma[TIM_DMA_ID_CC3],hdma_tim3_ch3);
    
27. 
    
28.   /* USER CODE BEGIN TIM3_MspInit 1 */
    
29. 
    
30.   /* USER CODE END TIM3_MspInit 1 */
    
31.   }
    
32. 
    
33. }

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建议你检查一下那个DMA使能函数的参数。另外在C:\project_32\STM32Cube_FW_F1_V1.7.0\Projects\STM3210E_EVAL\Examples\TIM\TIM_DMA  有个例程可以参考一下