STM32G031 ADC采集数值为0问题

开发平台：KEIL5

芯片：STM32G031

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。

使用STM32CubeMX生成代码。配置ADC引脚，PB0为ADC1_8,PA11[PA9]为ADC1_15.

生成代码如下：

int main(void)
{HAL_Init();SystemClock_Config();MX_DMA_Init();MX_ADC1_Init();MX_NVIC_Init();HAL_ADCEx_Calibration_Start(&hadc1);HAL_ADC_Start_DMA(&hadc1,(uint32_t *)&adcbuf,2);while (1){if(get_sys_time_us() % 1000 == 0){   printf("adc1 = %d\r\n", adcbuf[0]);printf("adc1 = %d\r\n", adcbuf[1]);}}

ADC_HandleTypeDef hadc1;
DMA_HandleTypeDef hdma_adc1;/* ADC1 init function */
void MX_ADC1_Init(void)
{ADC_AnalogWDGConfTypeDef AnalogWDGConfig = {0};ADC_ChannelConfTypeDef sConfig = {0};/** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion) */hadc1.Instance = ADC1;hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;hadc1.Init.Resolution = ADC_RESOLUTION_12B;hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;hadc1.Init.LowPowerAutoWait = DISABLE;hadc1.Init.LowPowerAutoPowerOff = DISABLE;hadc1.Init.ContinuousConvMode = ENABLE;hadc1.Init.NbrOfConversion = 2;hadc1.Init.DiscontinuousConvMode = DISABLE;hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;hadc1.Init.DMAContinuousRequests = ENABLE;hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;hadc1.Init.SamplingTimeCommon1 = ADC_SAMPLETIME_160CYCLES_5;hadc1.Init.SamplingTimeCommon2 = ADC_SAMPLETIME_160CYCLES_5;hadc1.Init.OversamplingMode = DISABLE;hadc1.Init.TriggerFrequencyMode = ADC_TRIGGER_FREQ_HIGH;if (HAL_ADC_Init(&hadc1) != HAL_OK){Error_Handler();}/** Configure Analog WatchDog 2 */AnalogWDGConfig.WatchdogMode = ADC_ANALOGWATCHDOG_SINGLE_REG;if (HAL_ADC_AnalogWDGConfig(&hadc1, &AnalogWDGConfig) != HAL_OK){Error_Handler();}/** Configure Regular Channel */sConfig.Channel = ADC_CHANNEL_15;sConfig.Rank = ADC_REGULAR_RANK_1;sConfig.SamplingTime = ADC_SAMPLINGTIME_COMMON_1;if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK){Error_Handler();}/** Configure Regular Channel */sConfig.Channel = ADC_CHANNEL_8;sConfig.Rank = ADC_REGULAR_RANK_2;sConfig.SamplingTime = ADC_SAMPLINGTIME_COMMON_2;if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK){Error_Handler();}}void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{GPIO_InitTypeDef GPIO_InitStruct = {0};if(adcHandle->Instance==ADC1){/* USER CODE BEGIN ADC1_MspInit 0 *//* USER CODE END ADC1_MspInit 0 *//* ADC1 clock enable */__HAL_RCC_ADC_CLK_ENABLE();__HAL_RCC_GPIOB_CLK_ENABLE();__HAL_RCC_GPIOA_CLK_ENABLE();/**ADC1 GPIO Configuration    PB0     ------> ADC1_IN8PA11 [PA9]     ------> ADC1_IN15 */GPIO_InitStruct.Pin = GPIO_PIN_0;GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;GPIO_InitStruct.Pull = GPIO_NOPULL;HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);GPIO_InitStruct.Pin = GPIO_PIN_11;GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;GPIO_InitStruct.Pull = GPIO_NOPULL;HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);/* ADC1 DMA Init *//* ADC1 Init */hdma_adc1.Instance = DMA1_Channel1;hdma_adc1.Init.Request = DMA_REQUEST_ADC1;hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;hdma_adc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;hdma_adc1.Init.Mode = DMA_CIRCULAR;hdma_adc1.Init.Priority = DMA_PRIORITY_HIGH;if (HAL_DMA_Init(&hdma_adc1) != HAL_OK){Error_Handler();}__HAL_LINKDMA(adcHandle,DMA_Handle,hdma_adc1);/* USER CODE BEGIN ADC1_MspInit 1 *//* USER CODE END ADC1_MspInit 1 */}
}

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.

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
如果是多通道则 Discontinuous Conversion Mode 要使能

正确代码:跳转链接

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