stm32之TIM+ADC+DMA采集50HZ交流信号

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void ADC_DMA_Config(void)
{
 DMA_InitTypeDef DMA_InitStructure;              
 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
 DMA_DeInit(DMA1_Channel1);  //DMA复位
 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;  //外设的地址
 DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue;  //存储区的起始地址
 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;  //DMA传输方向到内部存储区
 DMA_InitStructure.DMA_BufferSize = ADC_NUM;  //ADC转换的次数
 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;  //ADC数据长度为16位
 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;  //存储区数据长度为16位
 DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;