DMA 进行AD采集，采集的数据始终为0，请问各位大神。

类似青枫 · 发表于 2016-4-16 12:39:26

#include "stm32f10x.h"
#include "define.h"
#include "delay.h"
#include "stdio.h"
//àûóÃ′®¿ú·￠ËíAD2éÑùμÄÖμ
//ê±Öó3õê¼»ˉ

u16 ADCData[50];
void RCC_Configuration(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div6);//12M  ×î′ó14M

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
}

//GPIO3õê¼»ˉ
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;//TX
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;//RX
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;//ADμÄC41ü½Å
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;//Ä￡Äaá¿êäèë
GPIO_Init(GPIOC,&GPIO_InitStructure);
}

//ÖD¶ÏóÅÏè¼¶éèÖÃ
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//ÖD¶Ï·Ö×é2

NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn; ;//′®¿ú1í¨μà
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;//ÇàÕ¼0
NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;//Ïìó|1
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;//IRQí¨μà±»ê1Äü
NVIC_Init(&NVIC_InitStructure);
}
void USART_Configuration(void)
{
  USART_InitTypeDef  USART_InitStructure;
USART_InitStructure.USART_BaudRate=9600;
USART_InitStructure.USART_WordLength=USART_WordLength_8b;
USART_InitStructure.USART_StopBits=USART_StopBits_1;
USART_InitStructure.USART_Parity=USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;

USART_Init(USART1,&USART_InitStructure);
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
USART_Cmd(USART1,ENABLE);
USART_ClearFlag(USART1,USART_FLAG_TC);
}

void ADC_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;

ADC_InitStructure.ADC_Mode=ADC_Mode_Independent;//¶àá￠Ä￡ê½
ADC_InitStructure.ADC_ScanConvMode=DISABLE;//μ￥í¨μàÄ￡ê½
ADC_InitStructure.ADC_ContinuousConvMode=ENABLE;//Ñ-»·2é¼ˉ
ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_None;//èí¼t′￥·￠
ADC_InitStructure.ADC_DataAlign=ADC_DataAlign_Right;//óò¶ÔÆë
ADC_InitStructure.ADC_NbrOfChannel=1;//×a»»í¨μàêyÄ¿Îa1

ADC_Init(ADC1,&ADC_InitStructure);

ADC_RegularChannelConfig(ADC1,ADC_Channel_10,1,ADC_SampleTime_239Cycles5);//1æÔò×é,ADC1,í¨μà10￡¬ò»¸öí¨μà￡¬239.5¸öÖüÆú

ADC_DMACmd(ADC1,ENABLE);//ÖØòa °ÑADoíDMA°ó¶¨ò»Æe

ADC_Cmd(ADC1,ENABLE);//ê1ÄüADC1

ADC_ResetCalibration(ADC1);//¸′Î»
while(ADC_GetResetCalibrationStatus(ADC1)); //¡￠μè′yêÇ·ñ¸′Î»íê3é

ADC_StartCalibration(ADC1);//D￡×¼ADC1
while(ADC_GetCalibrationStatus(ADC1));//¼ìÑéêÇ·ñD￡×¼íê3é

ADC_SoftwareStartConvCmd(ADC1,ENABLE);//Æô¶ˉADC1

}
void DMA_Configuration(void)
{
   DMA_InitTypeDef DMA_InitStructure;

   DMA_DeInit(DMA1_Channel1);//ADC11òÔúDMA1μÄí¨μàéÏ

   DMA_InitStructure.DMA_PeripheralBaseAddr=(u32)&ADC1->DR;//íaéèμØÖ·ADC1Ëí¸øDMA
   DMA_InitStructure.DMA_MemoryBaseAddr=(u32)ADCData;//Äú′æμØÖ· Ëí¸øêy×é êy×éÃûμèóúêy×éμÄμØÖ·

    DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC;//íaéèADC1×÷Îaêy¾YμÄà′Ô′
   DMA_InitStructure.DMA_BufferSize=50;//»o3åÇøÎaêy×éμÄ′óD¡

DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;//íaéèADC1μÄ′æ′￠μØÖ·Îa2»±äμÄ
   DMA_InitStructure.DMA_MemoryInc=DMA_PeripheralInc_Enable;//Äú′æμÄμØÖ·êÇμYÔöμÄ

DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord;//íaéèêy¾Y¿í¶è16
   DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord;//Äú′æêy¾Y¿í¶è16
   DMA_InitStructure.DMA_Mode=DMA_Mode_Circular;//á¬Dø1¤×÷Ä￡ê½￡¬Ñ-»·2é¼ˉ
   DMA_InitStructure.DMA_Priority=DMA_Priority_High;//óÅÏè¼¶
   DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;//2»êÇÄú′æμ½Äú′æ íaéèμ½Äú′æ

   DMA_Init(DMA1_Channel1,&DMA_InitStructure);

   DMA_Cmd(DMA1_Channel1,ENABLE);//ê1ÄüDMA
}
int main(void)
{
u32 ad=0;
u8 i=0;
   delay_init();
RCC_Configuration(); //Ïμí3ê±Öó3õê¼»ˉ
GPIO_Configuration();//¶Ë¿ú3õê¼»ˉ
USART_Configuration();
NVIC_Configuration();
ADC_Configuration();
DMA_Configuration();
while(1)
{
   ad=0;
   for(i=0;i<50;i++)
   {
ad=ad+ADCData[i];
   }
   ad=ad/50;
   printf("ad =%f\r\n",3.24/4095*ad);
   delay_ms(1000);
   delay_ms(1000);

}
}