求助，独立多路ADC DMA传输通道之间相互影响

blueunplug

#include "adc.h"
#include "delay.h"   
#define ADC1_DR_ADDRESS    ((uint32_t)0x4001204C)
/* ±äÁ¿ ----------------------------------------------------------------------*/
extern __IO uint16_t ADC1ConvertedValue[64][2];
//³õʼ»¯ADC                  
void  Adc_Init(void)
{   
    ADC_InitTypeDef       ADC_InitStructure;
    ADC_CommonInitTypeDef ADC_CommonInitStructure;
    DMA_InitTypeDef       DMA_InitStructure;
    GPIO_InitTypeDef      GPIO_InitStructure;
    /* ʹÄÜ ADC1, DMA2 ºÍ GPIO ʱÖÓ ****************************************/
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    /* DMA2 Stream0 channel0 ÅäÖÃ **************************************/
    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 = 128;
    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);
    /* ÅäÖÃADC1ͨµÀ3¡¢5Òý½ÅΪģÄâÊäÈëģʽ******************************/
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div8;
    ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
    ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_20Cycles;
    ADC_CommonInit(&ADC_CommonInitStructure);
    /* ADC1 ³õʼ»¯ ****************************************************************/
    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_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfConversion = 2;
    ADC_Init(ADC1, &ADC_InitStructure);
    /* ADC1 ¹æÔò channel3¡¢5 ÅäÖà *************************************/
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_84Cycles);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_84Cycles);
   
    /* ʹÄÜDMAÇëÇó(µ¥ADCģʽ) */
    ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

    /* ʹÄÜ ADC1 DMA */
    ADC_DMACmd(ADC1, ENABLE);
    /* ʹÄÜ ADC1 */
    ADC_Cmd(ADC1, ENABLE);
ADC_SoftwareStartConv(ADC1);
}      

blueunplug

问题已经解决，解释一下，上面的配置没有问题，但是会出现显示一个通道然后对另一个通道数值产生影响，后来发现，显示的拿个通道引脚没有接任何电压所以会受影响。如果两个引脚分别接了电压就不会产生影响只有浮空状态时数值才会受到其他通道的影响

blueunplug

我把A0接地后，A1的数值会变成400多，A0接3.3V，A1会变成3000多，然而，什么都不接的话两个引脚一直在1000左右跳动

正点原子

帮顶

blueunplug

有没有dalao帮我看一下啊，这个真的搞定不了了

turlip8

DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)ADC1ConvertedValue;
该句是不是要改为取地址DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1ConvertedValue;

58lu

刚刚好！遇到同样的问题，谢谢啦