我用ADC和DMA完成数据采集,用ADC1_Channel5采集PA5的电压,连续采样模式,用DMA读取数据将ADC1->DR的值放在ADC_Value[50]中,传输数为50,我在主函数中读取数组求平均值并在显示屏中显示出来,但是发现数组中的数据不变,不管给PA5什么电压。我单次采样是成功的,求大家给分析分析
[mw_shl_code=applescript,true]
void Adc_Init(void)
{
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能GPIOA
//先初始化ADC1通道5 IO口
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;//PA5 通道5
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
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);//使能ADC1时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE); //ADC1复位
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE); //复位结束
ADC_TempSensorVrefintCmd(ENABLE);//使能内部温度传感器
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//独立模式
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1; //DMA失能
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4; //ADCCLK=PCLK2/4=84/4=21Mhz,ADC时钟最好不要超过36Mhz
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;//12位模式
ADC_InitStructure.ADC_ScanConvMode = DISABLE;//非扫描模式
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
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 = 1;//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_DMACmd(ADC1,ENABLE);
ADC_ContinuousModeCmd(ADC1, ENABLE);
ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE);//开启AD转换器
DMA_DeInit(DMA2_Stream0);
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)ADCConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = 50;
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);
//ADC_RegularChannelConfig(ADC1, ADC_Channel_16, 1, ADC_SampleTime_480Cycles ); //ADC16,ADC通道,480个周期,提高采样时间可以提高精确度
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 1, ADC_SampleTime_480Cycles ); //ADC1,ADC通道,480个周期,提高采样时间可以提高精确度
ADC_SoftwareStartConv(ADC1);
}[/mw_shl_code]
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