[问答]

多通道adc在stm32的所有通道中读取的值相同是为什么？怎么解决？

问答对人有帮助，内容完整，我也想知道答案 0 大家好，我一直在 STM32L072CBT6 控制器中工作，我有读取 adc 多通道的代码，我可以通过为每个通道使用单独的代码来单独读取不同通道的值，但是如果我一起读取所有四个通道，则一个值通道反映在所有通道中。而且我还检查了每个通道中的电压是否相同，发现所有值都不同，尽管我得到相同的值，例如反映在通道 0 中的通道 1 值，请分享我对这个问题的任何想法。我附上了下面的代码。 static void MX_ADC1_Init(void) { /* USER CODE BEGIN ADC1_Init 0 / / USER CODE END ADC1_Init 0 / ADC_ChannelConfTypeDef sConfig = {0}; / USER CODE BEGIN ADC1_Init 1 / / USER CODE END ADC1_Init 1 / /* 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.ScanConvMode = ENABLE; hadc1.Init.ContinuousConvMode = ENABLE; hadc1.Init.DiscontinuousConvMode = DISABLE; hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START; hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT; hadc1.Init.DMAContinuousRequests = DISABLE; hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;//ADC_EOC_SINGLE_CONV; //naga hadc.Init.SamplingTime = ADC_SAMPLETIME_160CYCLES_5; if (HAL_ADC_Init(&hadc1) != HAL_OK) { Error_Handler(); } } void ADC_Select_CH0 (void) { ADC_ChannelConfTypeDef sConfig = {0}; /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. / sConfig.Channel = ADC_CHANNEL_0; sConfig.Rank = ADC_RANK_CHANNEL_NUMBER; //sConfig.SamplingTime = ADC_SAMPLETIME_160CYCLES_5; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } } void ADC_Select_CH1 (void) { ADC_ChannelConfTypeDef sConfig = {0}; /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. / sConfig.Channel = ADC_CHANNEL_1; sConfig.Rank = ADC_RANK_CHANNEL_NUMBER; //sConfig.SamplingTime = ADC_SAMPLETIME_84CYCLES; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } } int main(void) { HAL_Init(); SystemClock_Config(); / Initialize all configured peripherals / MX_GPIO_Init(); MX_USART1_UART_Init(); MX_USART2_UART_Init(); MX_ADC1_Init(); // MX_ADC_Init(); / Infinite loop / / USER CODE BEGIN WHILE */ while (1) { AD_RES0 = 0; AD_RES1 = 0; // HAL_UART_Transmit(&huart1,Buf, sizeof(Buf), 100); // HAL_GPIO_WritePin(BUZZER_GPIO_Port, BUZZER_Pin, GPIO_PIN_RESET); ADC_Select_CH0(); HAL_ADC_Start(&hadc1); HAL_ADC_PollForConversion(&hadc1, 1000); AD_RES0 = HAL_ADC_GetValue(&hadc1); HAL_ADC_Stop(&hadc1); sprintf(Buf,"adc0 %u rn", AD_RES0); HAL_UART_Transmit(&huart1,Buf, sizeof(Buf), 100); // ADC->CCR \|= (1<ADEN); HAL_Delay(10); ADC_Select_CH1(); HAL_ADC_Start(&hadc1); HAL_ADC_PollForConversion(&hadc1, 1000); AD_RES1 = HAL_ADC_GetValue(&hadc1); HAL_ADC_Stop(&hadc1); sprintf(Buf," adc1 %u rn", AD_RES1); HAL_UART_Transmit(&huart1,Buf, sizeof(Buf), 100); HAL_Delay(10); } } 0
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答案对人有帮助，有参考价值 0 问题在于通道选择寄存器，下面的代码在轮询方法本身中工作正常。 void MX_ADC1_Init(void) { /* USER CODE BEGIN ADC1_Init 0 / / USER CODE END ADC1_Init 0 / ADC_ChannelConfTypeDef sConfig = {0}; / USER CODE BEGIN ADC1_Init 1 / / USER CODE END ADC1_Init 1 / /* 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.ScanConvMode = ENABLE; hadc1.Init.ContinuousConvMode = ENABLE; hadc1.Init.DiscontinuousConvMode = DISABLE; hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START; hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT; // hadc1.Init.NbrOfConversion = 1; hadc1.Init.DMAContinuousRequests = DISABLE; hadc1.Init.EOCSelection = ADC_EOC_SEQ_CONV;//ADC_EOC_SINGLE_CONV; //naga hadc.Init.SamplingTime = ADC_SAMPLETIME_160CYCLES_5; if (HAL_ADC_Init(&hadc1) != HAL_OK) { Error_Handler(); } // /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. // / // sConfig.Channel = ADC_CHANNEL_0; // sConfig.Rank = 1; // sConfig.SamplingTime = ADC_SAMPLETIME_28CYCLES; // if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) // { // Error_Handler(); // } // /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. // / // sConfig.Channel = ADC_CHANNEL_1; // sConfig.Rank = 2; // sConfig.SamplingTime = ADC_SAMPLETIME_84CYCLES; // if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) // { // Error_Handler(); // } // /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. // / // sConfig.Channel = ADC_CHANNEL_TEMPSENSOR; // sConfig.Rank = 3; // sConfig.SamplingTime = ADC_SAMPLETIME_112CYCLES; // if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) // { // Error_Handler(); // } / USER CODE BEGIN ADC1_Init 2 / / USER CODE END ADC1_Init 2 / } void ADC_Select_CH0 (void) { ADC_ChannelConfTypeDef sConfig = {0}; /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. / sConfig.Channel = ADC_CHANNEL_0; sConfig.Rank = ADC_RANK_CHANNEL_NUMBER; //sConfig.SamplingTime = ADC_SAMPLETIME_28CYCLES; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } } void ADC_Select_CH1 (void) { ADC_ChannelConfTypeDef sConfig = {0}; /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. / sConfig.Channel = ADC_CHANNEL_1; sConfig.Rank = ADC_RANK_CHANNEL_NUMBER; //sConfig.SamplingTime = ADC_SAMPLETIME_84CYCLES; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } } void ADC_Select_CH5 (void) { ADC_ChannelConfTypeDef sConfig = {0}; /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. / sConfig.Channel = ADC_CHANNEL_5; sConfig.Rank = ADC_RANK_CHANNEL_NUMBER; //sConfig.SamplingTime = ADC_SAMPLETIME_84CYCLES; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } } void ADC_Select_CH6 (void) { ADC_ChannelConfTypeDef sConfig = {0}; /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. / sConfig.Channel = ADC_CHANNEL_6; // sConfig.Rank = 6; //sConfig.SamplingTime = ADC_SAMPLETIME_84CYCLES; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } } void Adc_Read_Raw_Data(void) { ADC1->CHSELR = 0x01; ADC_Select_CH0(); HAL_ADC_Start(&hadc1); HAL_ADC_PollForConversion(&hadc1, 1000); Adc_0_Data = HAL_ADC_GetValue(&hadc1); HAL_ADC_Stop(&hadc1); sprintf(Buf,"adc0 %u rn", Adc_0_Data); HAL_UART_Transmit(&huart1,Buf, sizeof(Buf), 100); Channel_0_Volt = ((float)Adc_0_Data/4095)3.3; sprintf(Buf,"adc0 %u rn", (unsigned int)Channel_0_Volt); HAL_UART_Transmit(&huart1,Buf, sizeof(Buf), 100); //HAL_Delay(10); ADC1->CHSELR = 0x02; ADC_Select_CH1(); HAL_ADC_Start(&hadc1); HAL_ADC_PollForConversion(&hadc1, 1000); Adc_1_Data = HAL_ADC_GetValue(&hadc1); HAL_ADC_Stop(&hadc1); sprintf(Buf," adc1 %u rn", Adc_1_Data); HAL_UART_Transmit(&huart1,Buf, sizeof(Buf), 100); Channel_1_Volt = ((float)Adc_1_Data/4095)3.3; sprintf(Buf,"adc0 %u rn", (unsigned int)Channel_1_Volt); HAL_UART_Transmit(&huart1,Buf, sizeof(Buf), 100); //HAL_Delay(10); ADC1->CHSELR = 0x20; ADC_Select_CH5(); HAL_ADC_Start(&hadc1); HAL_ADC_PollForConversion(&hadc1, 1000); Adc_5_Data = HAL_ADC_GetValue(&hadc1); HAL_ADC_Stop(&hadc1); sprintf(Buf," adc5 %u rn", Adc_5_Data); HAL_UART_Transmit(&huart1,Buf, sizeof(Buf), 100); Channel_5_Volt = ((float)Adc_5_Data/4095)3.3; sprintf(Buf,"adc0 %u rn", (unsigned int)Channel_5_Volt); HAL_UART_Transmit(&huart1,Buf, sizeof(Buf), 100); //HAL_Delay(10); ADC1->CHSELR = 0x40; ADC_Select_CH6(); HAL_ADC_Start(&hadc1); HAL_ADC_PollForConversion(&hadc1, 1000); Adc_6_Data = HAL_ADC_GetValue(&hadc1); HAL_ADC_Stop(&hadc1); sprintf(Buf," adc6 %u rn", Adc_6_Data); HAL_UART_Transmit(&huart1,Buf, sizeof(Buf), 100); Channel_6_Volt = ((float)Adc_6_Data/4095)*3.3; sprintf(Buf,"adc0 %u rn", (unsigned int)Channel_6_Volt); HAL_UART_Transmit(&huart1,Buf, sizeof(Buf), 100); //HAL_Delay(100); }

2022-12-6 16:16:06 评论举报张宁