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好贴，MARK！

HI  
   有个问题纠结很久了。使用的STM32F205RE MCU SPI2 进行DMA 传输，数据量大的时候接收的数据会乱，直接将MISO 和 MOSI 短接测试的，代码如下：
   期望接收到的全部为0x55 ，实际出来的是前面数据正常，后面的数据就乱了。

1. /*****************************************
   
2. 函数名称:Cdfinger_Bspspi_init
   
3. 函数作用:spi初始化函数
   
4. 备注:
   
5. ******************************************/
   
6. void Cdfinger_Bspspi_init(void)
   
7. {
   
8.         GPIO_InitTypeDef GPIO_InitStructure;
   
9.         SPI_InitTypeDef  SPI_InitStructure;
   
10.         DMA_InitTypeDef  DMA_InitStructure;
    
11.         NVIC_InitTypeDef NVIC_InitStructure;
    
12.   
    
13.         int ii =0;
    
14.        
    
15.         RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
    
16.         /*!< Enable SPI2 clocks */
    
17.         RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
    
18.         /*!< Enable GPIO clocks */
    
19.         RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
    
20.         /*!< Connect SPI pins to AF5 */
    
21.         GPIO_PinAFConfig(GPIOB, GPIO_PinSource13,GPIO_AF_SPI2);
    
22.         GPIO_PinAFConfig(GPIOB, GPIO_PinSource14,GPIO_AF_SPI2);
    
23.         GPIO_PinAFConfig(GPIOB, GPIO_PinSource15,GPIO_AF_SPI2);
    
24. 
    
25.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    
26.         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
27.         GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    
28.         GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN;
    
29.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
    
30.         GPIO_Init(GPIOB, &GPIO_InitStructure);
    
31. 
    
32.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
    
33.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    
34.         GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    
35.         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
36.         GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//GPIO_PuPd_NOPULL;
    
37.         GPIO_Init(GPIOB, &GPIO_InitStructure);
    
38.         Cdfinger_BspCs_HIGH();
    
39.         //Cdfinger_Bspdelay_ms(1);
    
40.   //Cdfinger_BspCs_LOW();
    
41.         SPI_Cmd(SPI2,DISABLE);
    
42.         SPI_DeInit(SPI2);
    
43.         SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    
44.         SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    
45.         SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    
46.         SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    
47.         SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    
48.         SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;//;
    
49.         SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
    
50.         SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    
51.         SPI_InitStructure.SPI_CRCPolynomial = 7;
    
52.         SPI_Init(SPI2, &SPI_InitStructure);
    
53. 
    
54.   memset(&cdfingerimgtxbuf[0],0x55,COMMUNICATIONLEN);
    
55.         /* DMA1 Stream0 channel4 spi tx configuration **************************************/
    
56.         DMA_DeInit(DMA1_Stream4);
    
57.         DMA_InitStructure.DMA_Channel = DMA_Channel_0;
    
58.         DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(SPI2->DR);
    
59.         DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&cdfingerimgtxbuf[0];
    
60.         DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
    
61.         DMA_InitStructure.DMA_BufferSize = COMMUNICATIONLEN;
    
62.         DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//;
    
63.         DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    
64.         DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    
65.         DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    
66.         DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;// ;
    
67.         DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//DMA_Priority_Medium;//DMA_Priority_High;
    
68.         DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;//;//DMA_FIFOMode_Enable;
    
69.         DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
    
70.         DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    
71.         DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    
72.         DMA_Init(DMA1_Stream4, &DMA_InitStructure);
    
73.   
    
74.         /* DMA1 Stream0 channel3 spi rx configuration **************************************/
    
75.         DMA_DeInit(DMA1_Stream3);
    
76.         DMA_InitStructure.DMA_Channel = DMA_Channel_0;
    
77.         DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(SPI2->DR);
    
78.         DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&cdfingerimgrxbuf[0];//(uint32_t)&cdfingerimgrxbuf[0];
    
79.         DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
    
80.         DMA_InitStructure.DMA_BufferSize =COMMUNICATIONLEN;
    
81.         DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    
82.         DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    
83.         DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    
84.         DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    
85.         DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//DMA_Mode_Circular;
    
86.         DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//DMA_Priority_Medium;
    
87.         DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;//DMA_FIFOMode_Disable;
    
88.         DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
    
89.         DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    
90.         DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    
91.         DMA_Init(DMA1_Stream3, &DMA_InitStructure);
    
92.         //Cdfinger_BspCs_HIGH();
    
93.        
    
94. 
    
95. 
    
96.         //发送中断
    
97.         NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
    
98.         NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream4_IRQn;     
    
99.         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    
100.         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03;
     
101.         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
     
102.         NVIC_Init(&NVIC_InitStructure);
     
103.        
     
104.         //接收中断
     
105.         NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
     
106.         NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream3_IRQn;     
     
107.         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
     
108.         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x04;
     
109.         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
     
110.         NVIC_Init(&NVIC_InitStructure);
     
111.         SPI_TIModeCmd(SPI2,ENABLE);
     
112.         SPI_Cmd(SPI2, ENABLE);
     
113.         DMA_ITConfig(DMA1_Stream4,DMA_IT_TC,ENABLE);
     
114.         DMA_ITConfig(DMA1_Stream3,DMA_IT_TC,ENABLE);
     
115. 
     
116.   DMA_Cmd(DMA1_Stream3, ENABLE);
     
117.         DMA_Cmd(DMA1_Stream4, ENABLE);
     
118.         SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx|SPI_I2S_DMAReq_Rx, ENABLE);
     
119. 
     
120.         for(ii=0;ii<COMMUNICATIONLEN;ii++)
     
121.         {
     
122.           if(ii%8==0)
     
123.                 {
     
124.                                 printf("\r\n");
     
125.                 }
     
126.                 printf("  0x%x",cdfingerimgrxbuf[ii]);
     
127.         }
     
128.         printf("111\r\n");
     
129. }
     
130. 
     
131. 
     
132. void DMA1_Stream4_IRQHandler(void)
     
133. {
     
134.   if(DMA_GetITStatus(DMA1_Stream4,DMA_IT_TCIF4) != RESET)
     
135.   {
     
136.           printf("DMA1_Stream4_IRQHandler = %d \r\n",DMA_GetCurrDataCounter(DMA1_Stream4));
     
137.     DMA_Cmd(DMA1_Stream4, DISABLE);
     
138.                 DMA_ClearITPendingBit(DMA1_Stream4,DMA_IT_TCIF4);
     
139.           DMA_ClearFlag(DMA1_Stream4,DMA_IT_TCIF4);
     
140.   }
     
141. }
     
142. 
     
143. void DMA1_Stream3_IRQHandler(void)
     
144. {
     
145.   if(DMA_GetITStatus(DMA1_Stream3,DMA_IT_TCIF3) != RESET)
     
146.   {
     
147.           printf("DMA1_Stream3_IRQHandler = %d \r\n",DMA_GetCurrDataCounter(DMA1_Stream3));
     
148.     DMA_Cmd(DMA1_Stream3, DISABLE);
     
149.                 DMA_ClearITPendingBit(DMA1_Stream3,DMA_IT_TCIF3);
     
150.           DMA_ClearFlag(DMA1_Stream3,DMA_IT_TCIF3);
     
151.   }
     
152. }

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多看看别人出过的错，自己就不会犯了

多谢，大神中的大神

MARK一下

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