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代码如下，为什么采集回来只有两个数据而且跳变很大？求指导。 void Adc_DMA_Init(void) { //----------------------------初始化DMA----------------------------// GPIO_InitTypeDef GPIO_InitStructure; ADC_InitTypeDef ADC_InitStructure; ADC_CommonInitTypeDef ADC_CommonInitStructure; DMA_InitTypeDef DMA_InitStructure; RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA| RCC_AHB1Periph_GPIOC, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //使能ADC1时钟 DMA_InitStructure.DMA_Channel = DMA_Channel_0; //通道选择 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;//(uint32_t)&ADC1->DR DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&AD; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; DMA_InitStructure.DMA_BufferSize = 4; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设地址不变 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//内存地址递增 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); //先初始化ADC1通道1,4 IO口 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_4;//PA1 通道1,PA4 通道4 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//模拟输入 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;//不带上下拉 GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化 //先初始化ADC1通道10,11 IO口 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;//PC0 通道10,PC1 通道11 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//模拟输入 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;//不带上下拉 GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化 //----------------------------初始化ADC----------------------------// ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//独立模式 ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//两个采样阶段之间的延迟5个时钟 ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1; //DMA失能 ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div8;//预分频4分频。ADCCLK=PCLK2/4=84/4=21Mhz,ADC时钟最好不要超过36Mhz ADC_CommonInit(&ADC_CommonInitStructure);//初始化 ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;//12位模式 ADC_InitStructure.ADC_ScanConvMode = ENABLE;//扫描模式 ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;//连续转换 ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;//禁止触发检测，使用软件触发 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//右对齐 ADC_InitStructure.ADC_NbrOfConversion = 4;//1个转换在规则序列中 也就是只转换规则序列1 ADC_Init(ADC1, &ADC_InitStructure);//ADC初始化 ADC_RegularChannelConfig(ADC1,ADC_Channel_10,1,ADC_SampleTime_15Cycles); ADC_RegularChannelConfig(ADC1,ADC_Channel_11,2,ADC_SampleTime_15Cycles); ADC_RegularChannelConfig(ADC1,ADC_Channel_1,3,ADC_SampleTime_15Cycles); ADC_RegularChannelConfig(ADC1,ADC_Channel_4,4,ADC_SampleTime_15Cycles); ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE); ADC_DMACmd(ADC1,ENABLE);//使能ADC的DMA传输 ADC_Cmd(ADC1, ENABLE);//开启AD转换器 ADC_SoftwareStartConv(ADC1); //连续转换开始，ADC通过DMA方式不断的更新RAM区。 } |
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还没采回来呢，求平均就可以了吧。或者麻烦点的冒泡法，取中间的量，再求均值。