关于用DMA实现SPI通信的问题

只看该作者 · 2014-4-10 16:57

STM32作为从机，打算用DMA来实现收发，配置如下：
void SPI1_DMA_Configuration(void)
{

DMA_InitTypeDef DMA_InitStructure;

/* DMA1 Channel2 (triggered by SPI1 Rx event) Config */
DMA_DeInit(DMA1_Channel2);
DMA_InitStructure.DMA_PeripheralBaseAddr = SPI1_DR_Addr;                         //?? SPI1 ????(0x4001300C) ??(????)
// DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SRC_Buffer;                   //?? SRAM ????(????)
DMA_InitStructure.DMA_MemoryBaseAddr = (u16)SendD;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;                               //???? ??-??
DMA_InitStructure.DMA_BufferSize = buffersize;                      //?? SPI1 ????
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;    //Êý¾Ý¿í¶È16Î»
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;          //¹¤×÷ÔÚÕý³£»º´æÄ£Ê½
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStructure);          //²»ÉèÖÃÎªÄÚ´æµ½ÄÚ´æ´«Êä

DMA_ITConfig(DMA1_Channel2, DMA_IT_TC, ENABLE);          //¿ªÆô½ÓÊÕÍê³ÉÖÐ¶Ï
  /* Enable SPI1 DMA RX request */
SPI1->CR2 |= 1<<0;                                                                //½ÓÊÕ»º³åÇøDMAÊ¹ÄÜ
DMA_Cmd(DMA1_Channel2, ENABLE);

/* DMA1 Channel3 (triggered by SPI1 Tx event) Config */
DMA_DeInit(DMA1_Channel3);
//DMA_InitStructure.DMA_PeripheralBaseAddr = SPI1_DR_Addr;                         //??  ????(0x4001300C) ??(???)
DMA_InitStructure.DMA_PeripheralBaseAddr = SPI1_DR_Addr;
// DMA_InitStructure.DMA_MemoryBaseAddr = (u32)DST_Buffer;                   //?? SRAM ????(???)
DMA_InitStructure.DMA_MemoryBaseAddr = (u16)ReceivedD;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;                               //???? ??-??
DMA_InitStructure.DMA_BufferSize = buffersize;                         //?? SPI1Êý¾Ý¿í¶È
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable;                //??????(??)
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                         //??????(??)
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;          //??????(??)
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;                //16Î»
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;                                  //????,???????,?????
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;                         //????-?(??)
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;                                     //?????????
DMA_Init(DMA1_Channel3, &DMA_InitStructure);

DMA_ITConfig(DMA1_Channel3, DMA_IT_TC, ENABLE);                                  //¿ªÆô·¢ËÍÍê³ÉÖÐ¶Ï
//DMA_ITConfig(DMA1_Channel3, DMA_IT_TE, ENABLE);                                  //¿ªÆô·¢ËÍ´íÎóÖÐ¶Ï
/* Enable SPI1 DMA TX request */
  SPI1->CR2 |= 1<<1;                                                             //·¢ËÍ»º³åÇøDMAÊ¹ÄÜ
  DMA_Cmd(DMA1_Channel3, ENABLE);                                                 //Ê¹ÄÜDMA
}
/*ÅäÖÃDAMÖÐ¶Ï*/
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel2_IRQn;       //DMAÍ¨µÀ2ÖÐ¶Ï
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;    //Ö÷ÓÅÏÈ¼¶Îª2
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;    //´ÓÓÅÏÈ¼¶Îª0
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;    //    NVIC_Init(&NVIC_InitStructure);
  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;    //Ö÷ÓÅÏÈ¼¶Îª2
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;    //´ÓÓÅÏÈ¼¶Îª0
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;    //
  NVIC_Init(&NVIC_InitStructure);
为什么我的程序运行的时候不能正常收发数据呢？
每次程序都会运行到
            B    .

            ENDP

            ALIGN

1万 · 2014-4-10 18:14

SPI, 用 DMA 来传输, 是个不错的办法, 可以减少不少中断开销

不过楼主的问题没有描述清楚, "每次程序都会运行到
B ."

是不是遇到异常了? 借助调试器跟踪一下

只看该作者 · 2014-4-11 08:15

airwill 发表于 2014-4-10 18:14
SPI, 用 DMA 来传输, 是个不错的办法, 可以减少不少中断开销

不过楼主的问题没有描述清楚, "每次程序都会 ...

嗯，是的，程序运行到这儿之后就一直在此循环，进不了主函数。我的中断函数为：
void DMA1_Channel2_IRQnHandler(void)
{
DMA_ClearITPendingBit(DMA1_IT_TC2); /*Çå³ýDMAÈ«¾ÖÖÐ¶Ï¹ÒÆð±êÖ¾*/
}
void DMA1_Channel3_IRQnHandler(void)
{
DMA_ClearITPendingBit(DMA1_IT_TC3); /*Çå³ýDMAÈ«¾ÖÖÐ¶Ï¹ÒÆð±êÖ¾*/
}

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