开发平台：KEIL5

芯片：STM32G031
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. Q2 M, V+ F8 S) A* Y3 q描述：近日使用STM32G031给客户做一款产品，在使用ADC时出现，采集的数值一直为0的情况。分享给大家。

$ d  y) s) K: Z  o使用STM32CubeMX生成代码。配置ADC引脚，PB0为ADC1_8,PA11[PA9]为ADC1_15.
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生成代码如下：

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1. int main(void)
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2. {
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3.     HAL_Init();
   
4.     SystemClock_Config();
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5.     MX_DMA_Init();
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6.     MX_ADC1_Init();
   
7.     MX_NVIC_Init();
   
8.     HAL_ADCEx_Calibration_Start(&hadc1);
   
9.     HAL_ADC_Start_DMA(&hadc1,(uint32_t *)&adcbuf,2);
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10.     while (1)
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11.     {
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12.           if(get_sys_time_us() % 1000 == 0)
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13.         {   
    
14.             printf("adc1 = %d\r\n", adcbuf[0]);
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15.             printf("adc1 = %d\r\n", adcbuf[1]);
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16.         }
    
17. 
    
18.     }

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1. ADC_HandleTypeDef hadc1;
   
2. DMA_HandleTypeDef hdma_adc1;
   
3. 
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4. /* ADC1 init function */
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5. void MX_ADC1_Init(void)
   
6. {
   
7.   ADC_AnalogWDGConfTypeDef AnalogWDGConfig = {0};
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8.   ADC_ChannelConfTypeDef sConfig = {0};
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9. 
   
10.   /** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
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11.   */
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12.   hadc1.Instance = ADC1;
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13.   hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
    
14.   hadc1.Init.Resolution = ADC_RESOLUTION_12B;
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15.   hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
    
16.   hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;
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17.   hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
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18.   hadc1.Init.LowPowerAutoWait = DISABLE;
    
19.   hadc1.Init.LowPowerAutoPowerOff = DISABLE;
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20.   hadc1.Init.ContinuousConvMode = ENABLE;
    
21.   hadc1.Init.NbrOfConversion = 2;
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22.   hadc1.Init.DiscontinuousConvMode = DISABLE;
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23.   hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
    
24.   hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
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25.   hadc1.Init.DMAContinuousRequests = ENABLE;
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26.   hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
    
27.   hadc1.Init.SamplingTimeCommon1 = ADC_SAMPLETIME_160CYCLES_5;
    
28.   hadc1.Init.SamplingTimeCommon2 = ADC_SAMPLETIME_160CYCLES_5;
    
29.   hadc1.Init.OversamplingMode = DISABLE;
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30.   hadc1.Init.TriggerFrequencyMode = ADC_TRIGGER_FREQ_HIGH;
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31.   if (HAL_ADC_Init(&hadc1) != HAL_OK)
    
32.   {
    
33.     Error_Handler();
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34.   }
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35.   /** Configure Analog WatchDog 2
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36.   */
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37.   AnalogWDGConfig.WatchdogMode = ADC_ANALOGWATCHDOG_SINGLE_REG;
    
38.   if (HAL_ADC_AnalogWDGConfig(&hadc1, &AnalogWDGConfig) != HAL_OK)
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39.   {
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40.     Error_Handler();
    
41.   }
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42.   /** Configure Regular Channel
    
43.   */
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44.   sConfig.Channel = ADC_CHANNEL_15;
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45.   sConfig.Rank = ADC_REGULAR_RANK_1;
    
46.   sConfig.SamplingTime = ADC_SAMPLINGTIME_COMMON_1;
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47.   if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
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48.   {
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49.     Error_Handler();
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50.   }
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51.   /** Configure Regular Channel
    
52.   */
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53.   sConfig.Channel = ADC_CHANNEL_8;
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54.   sConfig.Rank = ADC_REGULAR_RANK_2;
    
55.   sConfig.SamplingTime = ADC_SAMPLINGTIME_COMMON_2;
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56.   if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
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57.   {
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58.     Error_Handler();
    
59.   }
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60. 
    
61. }
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62. 
    
63. void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
    
64. {
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65. 
    
66.   GPIO_InitTypeDef GPIO_InitStruct = {0};
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67.   if(adcHandle->Instance==ADC1)
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68.   {
    
69.   /* USER CODE BEGIN ADC1_MspInit 0 */
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70. 
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71.   /* USER CODE END ADC1_MspInit 0 */
    
72.     /* ADC1 clock enable */
    
73.     __HAL_RCC_ADC_CLK_ENABLE();
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74. 
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75.     __HAL_RCC_GPIOB_CLK_ENABLE();
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76.     __HAL_RCC_GPIOA_CLK_ENABLE();
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77.     /**ADC1 GPIO Configuration   
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78.     PB0     ------> ADC1_IN8
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79.     PA11 [PA9]     ------> ADC1_IN15
    
80.     */
    
81.     GPIO_InitStruct.Pin = GPIO_PIN_0;
    
82.     GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
    
83.     GPIO_InitStruct.Pull = GPIO_NOPULL;
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84.     HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
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85. 
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86.     GPIO_InitStruct.Pin = GPIO_PIN_11;
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87.     GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
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88.     GPIO_InitStruct.Pull = GPIO_NOPULL;
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89.     HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
    
90. 
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91.     /* ADC1 DMA Init */
    
92.     /* ADC1 Init */
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93.     hdma_adc1.Instance = DMA1_Channel1;
    
94.     hdma_adc1.Init.Request = DMA_REQUEST_ADC1;
    
95.     hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
    
96.     hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;
    
97.     hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;
    
98.     hdma_adc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
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99.     hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
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100.     hdma_adc1.Init.Mode = DMA_CIRCULAR;
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101.     hdma_adc1.Init.Priority = DMA_PRIORITY_HIGH;
     
102.     if (HAL_DMA_Init(&hdma_adc1) != HAL_OK)
     
103.     {
     
104.       Error_Handler();
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105.     }
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106. 
     
107.     __HAL_LINKDMA(adcHandle,DMA_Handle,hdma_adc1);
     
108. 
     
109.   /* USER CODE BEGIN ADC1_MspInit 1 */
     
110. 
     
111.   /* USER CODE END ADC1_MspInit 1 */
     
112.   }
     
113. }

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把STM32CubeMX生成的代码下载到芯片中运行，结果ADC1_8的值可以读到，但是ADC1_15的值却一直为0.
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出现上述问题的原因是因为STM32G031的 ADC 序列器配置成完全可配置时，只能使用通
道 0-14，不能使用通道 15,16,17,18；所以在有使用到通道 15,16,17,18 的情况下，ADC 序列
器要配置成不完全可配置。Sequencer 选项选择为：Sequencer not fully configurable
* @3 ^5 b0 g' e; {0 J7 y  U8 q3 ]  \如果是多通道则 Discontinuous Conversion Mode 要使能