stm32f407六路规则通道ad采样，数据不稳定，求问原子等大神

2019-07-20 18:15发布

刚改好的，基于官方库函数。数据不是很稳定，抖动厉害，ad输入接地偶尔会有30出现，接1v电压，数据抖动在正负3之间。

ad输入管脚pc0-pc5

#define ADC1_DR_ADDRESS ((uint32_t)0x4001204C)；//&(adc->dr);
__IO uint16_t ADC1ConvertedValue[6] = {0,0,0,0,0,0}; //结果存放在这里；

void ADC1_CH10to15_DMA_Config(void) { ADC_InitTypeDef ADC_InitStructure; ADC_CommonInitTypeDef ADC_CommonInitStructure; DMA_InitTypeDef DMA_InitStructure; GPIO_InitTypeDef GPIO_InitStructure;
/* Enable ADC1, DMA2 and GPIO clocks ****************************************/ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOC, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
/* DMA2 Stream0 channel0 configuration **************************************/ DMA_InitStructure.DMA_Channel = DMA_Channel_0; DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS; DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1ConvertedValue; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; DMA_InitStructure.DMA_BufferSize = 6; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; DMA_Init(DMA2_Stream0, &DMA_InitStructure); DMA_Cmd(DMA2_Stream0, ENABLE);
/* Configure ADC1 Channel10to15 pin as analog input ******************************/ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ; GPIO_Init(GPIOC, &GPIO_InitStructure);
/* ADC Common Init **********************************************************/ ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2; ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC1 Init ****************************************************************/ ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; ADC_InitStructure.ADC_ScanConvMode = ENABLE; ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfConversion = 6; ADC_Init(ADC1, &ADC_InitStructure);
/* ADC1 regular channel10to15 configuration *************************************/ ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_112Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 2, ADC_SampleTime_112Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 3, ADC_SampleTime_112Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 4, ADC_SampleTime_112Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 5, ADC_SampleTime_112Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 6, ADC_SampleTime_112Cycles);
/* Enable DMA request after last transfer (Single-ADC mode) */ ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
/* Enable ADC1 DMA */ ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC1 */ ADC_Cmd(ADC1, ENABLE); }

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