使用STM32F4的ADC采集4路电压信号，通过DMA传输，可是串口助手一直不能接受数据

1. 主程序
   
2. int main(void)
   
3. {
   
4.   delay_init(168);
   
5.         uart_init(115200);
   
6.   Adc_Init();
   
7.         LED_Init();
   
8.         delay_ms(10);
   
9.         LED0=0;
   
10.         MYDMA_Config(DMA2_Stream0,(u32)&ADC1->DR,(u32)&ADC_V);
    
11.         while(1)
    
12.         {
    
13.           if(DMA_GetFlagStatus(DMA2_Stream0,DMA_FLAG_TCIF0)！=RESET)
    
14.     {
    
15.       printf("adc0=%d  ",ADC_V[0]);
    
16.       printf("adc1=%d  ",ADC_V[1]);
    
17.                         printf("adc0=%d  ",ADC_V[2]);
    
18.       printf("adc1=%d  ",ADC_V[3]);
    
19.      DMA_ClearFlag(DMA2_Stream0,DMA_FLAG_TCIF0);
    
20.     }
    
21.                 delay_ms(1);
    
22.         }
    
23. }
    
24. 
    
25. ADC的程序
    
26. void  Adc_Init(void)
    
27. {   
    
28.   GPIO_InitTypeDef  GPIO_InitStructure;
    
29.         ADC_CommonInitTypeDef ADC_CommonInitStructure;
    
30.         ADC_InitTypeDef       ADC_InitStructure;
    
31.        
    
32.   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//ê1?üGPIOAê±?ó
    
33.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //ê1?üADC1ê±?ó
    
34. 
    
35. 
    
36.   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_5|GPIO_Pin_6;
    
37.   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//?￡?aê?è?
    
38.   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;//2?′?é???à-
    
39.   GPIO_Init(GPIOA, &GPIO_InitStructure);//3?ê??ˉ  
    
40. 
    
41.         RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE);          //ADC1?′??
    
42.         RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE);        //?′???áê?         
    
43. 
    
44.        
    
45.   ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//?àá￠?￡ê?
    
46.   ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//á???2é?ù?×??????μ??ó3ù5??ê±?ó
    
47.   ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
    
48.   ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;//?¤·??μ4·??μ?￡ADCCLK=PCLK2/4=84/4=21Mhz,ADCê±?ó×?o?2?òa3?1y36Mhz
    
49.   ADC_CommonInit(&ADC_CommonInitStructure);//3?ê??ˉ
    
50.        
    
51.   ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;//12???￡ê?
    
52.   ADC_InitStructure.ADC_ScanConvMode = ENABLE;
    
53.   ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    
54.   ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;//???1′￥·￠?ì2a￡?ê1ó?èí?t′￥·￠
    
55.   ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//óò????       
    
56.   ADC_InitStructure.ADC_NbrOfConversion = 4;
    
57.   ADC_Init(ADC1, &ADC_InitStructure);//ADC3?ê??ˉ
    
58.        
    
59.         ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_480Cycles );        //ADC1,ADCí¨μà,480???ü?ú,ìá??2é?ùê±???éò?ìá????è·?è                       
    
60.   ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_480Cycles );
    
61.   ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 3, ADC_SampleTime_480Cycles );
    
62.   ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 4, ADC_SampleTime_480Cycles );       
    
63.        
    
64.        
    
65.         ADC_Cmd(ADC1, ENABLE);       
    
66.         ADC_SoftwareStartConv(ADC1);
    
67.         ADC_DMARequestAfterLastTransferCmd(ADC1,ENABLE);
    
68.         ADC_DMACmd(ADC1,ENABLE);
    
69.   
    
70. 
    
71. }
    
72. 
    
73. DMA程序
    
74. void MYDMA_Config(DMA_Stream_TypeDef *DMA_Streamx,u32 par,u32 mar)
    
75. {
    
76. 
    
77.         DMA_InitTypeDef  DMA_InitStructure;
    
78.         NVIC_InitTypeDef NVIC_InitStructure;
    
79.        
    
80.         if((u32)DMA_Streamx>(u32)DMA2)//μ?μ?μ±?°streamê?ê?óúDMA2?1ê?DMA1
    
81.         {
    
82.           RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);//DMA2ê±?óê1?ü
    
83.                
    
84.         }else
    
85.         {
    
86.           RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);//DMA1ê±?óê1?ü
    
87.         }
    
88.   DMA_DeInit(DMA_Streamx);
    
89.        
    
90.         while (DMA_GetCmdStatus(DMA_Streamx) ！= DISABLE){}//μè′yDMA?é????
    
91.        
    
92.   /* ???? DMA Stream */
    
93.   DMA_InitStructure.DMA_Channel = DMA_Channel_0;  //í¨μà????
    
94.   DMA_InitStructure.DMA_PeripheralBaseAddr = par;//DMAíaéèμ??·
    
95.   DMA_InitStructure.DMA_Memory0BaseAddr = mar;//DMA ′?′￠?÷0μ??·
    
96.   DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//íaéèμ?′?′￠?÷
    
97.   DMA_InitStructure.DMA_BufferSize = 4;//êy?Y′?ê?á?
    
98.   DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//íaéè·???á??￡ê?
    
99.   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//′?′￠?÷??á??￡ê?
    
100.   DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//íaéèêy?Y3¤?è:16??
     
101.   DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//′?′￠?÷êy?Y3¤?è:16??
     
102.   DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//?-?·?￡ê?
     
103.   DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//?Dμèó??è??
     
104.   DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
     
105.   DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
     
106.   DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//′?′￠?÷í?·￠μ￥′?′?ê?
     
107.   DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//íaéèí?·￠μ￥′?′?ê?
     
108.   DMA_Init(DMA_Streamx, &DMA_InitStructure);//3?ê??ˉDMA Stream
     
109. 
     
110.         DMA_Cmd(DMA_Streamx, ENABLE);                      //?a??DMA′?ê?
     
111.                
     
112. 
     
113. }         
     

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