TIM3捕获触发DMA

有何不可

#include "capturedma.h"

#define BUF_SIZE 20
unsigned short ReadBuf[BUF_SIZE];
#define CameraReadAdr (unsigned int)&(GPIOA->IDR)//0x40020010//GPIOA IDR
#define ReadBufAdr (unsigned int)&(ReadBuf[0])
static void TIM3_CH3_NVIC_Init(void)
{
        NVIC_InitTypeDef NVIC_InitStructure;
  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;   //ÇàÕ¼óÅÏ輶3
        NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;                      //×óóÅÏ輶3
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                              //IRQí¨μàê1Äü
        NVIC_Init(&NVIC_InitStructure);                                  //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷¡￠
}
static void DMA1_Stream7_NVIC_Init(void)
{
        NVIC_InitTypeDef NVIC_InitStructure;
  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream7_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;   //ÇàÕ¼óÅÏ輶3
        NVIC_InitStructure.NVIC_IRQChannelSubPriority =0;                      //×óóÅÏ輶3
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                              //IRQí¨μàê1Äü
        NVIC_Init(&NVIC_InitStructure);                                  //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷¡￠       
}
static void DMA1_Stream7_Init(void)
{
        DMA_InitTypeDef  DMA_InitStructure;

        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);//DMA1ê±Öóê1Äü

        DMA_DeInit(DMA1_Stream7);
       
        while (DMA_GetCmdStatus(DMA1_Stream7) != DISABLE){}//μè′yDMA¿éÅäÖà        
               
/* ÅäÖÃ DMA Stream */
  DMA_InitStructure.DMA_Channel = DMA_Channel_5;  //í¨μàÑ¡Ôñ
  DMA_InitStructure.DMA_PeripheralBaseAddr = CameraReadAdr;//DMAíaéèμØÖ·
  DMA_InitStructure.DMA_Memory0BaseAddr = ReadBufAdr;//DMA ′æ′￠Æ÷0μØÖ·
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//′æ′￠Æ÷μ½íaéèÄ￡ê½
  DMA_InitStructure.DMA_BufferSize = BUF_SIZE;//êy¾Y′«êäá¿
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//íaéè·ÇÔöá¿Ä￡ê½
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//′æ′￠Æ÷Ôöá¿Ä￡ê½
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//íaéèêy¾Y3¤¶è:8λ
  DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord;//′æ′￠Æ÷êy¾Y3¤¶è:8λ
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//ê1óÃÑ-»·Ä￡ê½
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;//ÖDμèóÅÏ輶
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//′æ′￠Æ÷í»·￠μ￥′Î′«êä
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//íaéèí»·￠μ￥′Î′«êä
  DMA_Init(DMA1_Stream7, &DMA_InitStructure);//3õê¼»ˉDMA Stream

  /* Enable DMA2_Stream1 */
  DMA_Cmd(DMA1_Stream7, ENABLE);  

  /* Enable DMA2_Stream1 Transfer complete interrupt -------------------------*/                 
        DMA_ITConfig(DMA1_Stream7,DMA_IT_TC,ENABLE);//DMA′«êäíê3éÖD¶Ï                
}
static void TIM3_CH3_Cap_Init()
{
        TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
        TIM_ICInitTypeDef  TIM_ICInitStructure;       
       
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);  ///ê1ÄüTIM3ê±Öó
       
  TIM_TimeBaseInitStructure.TIM_Period = 10000;         //×Ô¶ˉÖØ×°ÔØÖμ
        TIM_TimeBaseInitStructure.TIM_Prescaler=4199;  //¶¨ê±Æ÷·ÖÆμ
        TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up; //ÏòéϼÆêyÄ￡ê½
        TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;
       
        TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);//3õê¼»ˉTIM3
       
        TIM_ClearFlag(TIM3,TIM_FLAG_Update);          /*Çå3yÖD¶Ï±êÖ¾*/       
//        TIM_SelectCCDMA(TIM3,ENABLE);       
        TIM_DMACmd(TIM3,TIM_DMA_Update, ENABLE);       
//        TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE); //ÔêDí¶¨ê±Æ÷3¸üDÂÖD¶Ï
        TIM_Cmd(TIM3, ENABLE);     
}
void TIM3_CH3_DMA_Init(void)
{         
        DMA1_Stream7_NVIC_Init();
        DMA1_Stream7_Init();
        TIM3_CH3_Cap_Init();
}
//¶¨ê±Æ÷3ÖD¶Ï·tÎñ3ìDò         
void TIM3_IRQHandler(void)
{                     
        if(TIM_GetITStatus(TIM3,TIM_IT_Update)==SET) //òç3öÖD¶Ï
                TIM_ClearITPendingBit(TIM3,TIM_IT_Update);  //Çå3yÖD¶Ï±ê־λ       
}
//void DMA1_Stream7_IRQHandler(void)
//{
//        if(DMA_GetITStatus(DMA1_Stream7, DMA_IT_TCIF7)==SET)
//        {
//                DMA_ClearITPendingBit(DMA1_Stream7,DMA_IT_TCIF7);
//        }
//}


问题：我用TIM3_CH3的输入捕获功能，触发DMA1_Stream7,在设置源地址如果为TIM3的寄存器比如：#define CameraReadAdr (unsigned int)&(TIM3->DIER)
就能触发DMA,能进DMA的传输完成中断，但如果#define CameraReadAdr (unsigned int)&(GPIOA->IDR)就会在DMA就会传输错误

正点原子

我觉得应该可以哦

正点原子

看看是不是其他地方的问题