请问大神，为什么我的ADC_CH_NUM一定要等于10，如果改成2，读出来的数据是错的，求大神指点我怎么改。万分感谢。
#include "adc.h"
#include "dma.h"
u16 ADC_Value[ADC_CH_NUM] = {0};
u16 ADC_AfterFilter[ADC_CH_NUM] = {0};
void Adc_Init(void)
{
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_ADC1,ENABLE ); //使能ADC1通道时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div6); //设置ADC分频因子6 72M/6=12,ADC最大时间不能超过14M
//PB0-B1 作为模拟通道输入引脚
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* DMA channel1 configuration */
DMA_DeInit(DMA1_Channel1);
/*定义DMA外设基地址,即为存放转换结果的寄存器*/
DMA_InitStructure.DMA_PeripheralBaseAddr =(u32)&(ADC1->DR);
/*定义内存基地址*/
DMA_InitStructure.DMA_MemoryBaseAddr =(u32)ADC_Value;
/*定义AD外设作为数据传输的来源*/
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
/*指定DMA通道的DMA缓存的大小,即需要开辟几个内存空间，由ADC_CH_NUM这个宏决定*/
DMA_InitStructure.DMA_BufferSize = ADC_CH_NUM;
/*设定寄存器地址固定*/
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
/*设定内存地址递加，即每次DMA都是将该外设寄存器中的值传到开辟的内存空间中*/
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
/*设定外设数据宽度 半字*/
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
/*设定内存的的宽度 半字*/
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
/*设定DMA工作再循环缓存模式*/
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
/*设定DMA选定的通道软件优先级*/
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
/* Enable DMA channel1 */
DMA_Cmd(DMA1_Channel1, ENABLE);
ADC_DeInit(ADC1); //复位ADC1
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC工作模式:ADC1和ADC2工作在独立模式
ADC_InitStructure.ADC_ScanConvMode = ENABLE ; //模数转换工作在扫描模式
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE ; //模数转换工作在连续转换模式
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //转换由软件而不是外部触发启动
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC数据右对齐
ADC_InitStructure.ADC_NbrOfChannel = ADC_CH_NUM; //顺序进行规则转换的ADC通道的数目
ADC_Init(ADC1, &ADC_InitStructure); //根据ADC_InitStruct中指定的参数初始化外设ADCx的寄存器
RCC_ADCCLKConfig(RCC_PCLK2_Div6); //设置ADC分频因子6 72M/6=12,ADC最大时间不能超过14M
/*ADC通道编号*/
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 5, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 6, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 7, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 8, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 9, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 10, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_10,11, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_11,12, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_12,13, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_13,14, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_14,15, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_15,16, ADC_SampleTime_55Cycles5);
ADC_DMACmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE); //使能指定的ADC1
ADC_ResetCalibration(ADC1); //使能复位校准
while(ADC_GetResetCalibrationStatus(ADC1)); //等待复位校准结束
ADC_StartCalibration(ADC1); //开启AD校准
while(ADC_GetCalibrationStatus(ADC1)); //等待校准结束
ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能指定的ADC1的软件转换启动功能
}
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