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請問大神，為什么我的ADC_CH_NUM一定要等于10，如果改成2，讀出來的數(shù)據(jù)是錯(cuò)的，求大神指點(diǎn)我怎么改。萬分感謝。
#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通道時(shí)鐘
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div6); //設(shè)置ADC分頻因子6 72M/6=12,ADC最大時(shí)間不能超過14M
//PB0-B1 作為模擬通道輸入引腳
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模擬輸入引腳
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* DMA channel1 configuration */
DMA_DeInit(DMA1_Channel1);
/*定義DMA外設(shè)基地址,即為存放轉(zhuǎn)換結(jié)果的寄存器*/
DMA_InitStructure.DMA_PeripheralBaseAddr =(u32)&(ADC1->DR);
/*定義內(nèi)存基地址*/
DMA_InitStructure.DMA_MemoryBaseAddr =(u32)ADC_Value;
/*定義AD外設(shè)作為數(shù)據(jù)傳輸?shù)膩碓?/
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
/*指定DMA通道的DMA緩存的大小,即需要開辟幾個(gè)內(nèi)存空間，由ADC_CH_NUM這個(gè)宏決定*/
DMA_InitStructure.DMA_BufferSize = ADC_CH_NUM;
/*設(shè)定寄存器地址固定*/
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
/*設(shè)定內(nèi)存地址遞加，即每次DMA都是將該外設(shè)寄存器中的值傳到開辟的內(nèi)存空間中*/
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
/*設(shè)定外設(shè)數(shù)據(jù)寬度 半字*/
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
/*設(shè)定內(nèi)存的的寬度 半字*/
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
/*設(shè)定DMA工作再循環(huán)緩存模式*/
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
/*設(shè)定DMA選定的通道軟件優(yōu)先級*/
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); //復(fù)位ADC1
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC工作模式:ADC1和ADC2工作在獨(dú)立模式
ADC_InitStructure.ADC_ScanConvMode = ENABLE ; //模數(shù)轉(zhuǎn)換工作在掃描模式
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE ; //模數(shù)轉(zhuǎn)換工作在連續(xù)轉(zhuǎn)換模式
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //轉(zhuǎn)換由軟件而不是外部觸發(fā)啟動(dòng)
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC數(shù)據(jù)右對齊
ADC_InitStructure.ADC_NbrOfChannel = ADC_CH_NUM; //順序進(jìn)行規(guī)則轉(zhuǎn)換的ADC通道的數(shù)目
ADC_Init(ADC1, &ADC_InitStructure); //根據(jù)ADC_InitStruct中指定的參數(shù)初始化外設(shè)ADCx的寄存器
RCC_ADCCLKConfig(RCC_PCLK2_Div6); //設(shè)置ADC分頻因子6 72M/6=12,ADC最大時(shí)間不能超過14M
/*ADC通道編號*/
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); //使能復(fù)位校準(zhǔn)
while(ADC_GetResetCalibrationStatus(ADC1)); //等待復(fù)位校準(zhǔn)結(jié)束
ADC_StartCalibration(ADC1); //開啟AD校準(zhǔn)
while(ADC_GetCalibrationStatus(ADC1)); //等待校準(zhǔn)結(jié)束
ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能指定的ADC1的軟件轉(zhuǎn)換啟動(dòng)功能
}
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