stm32 f4 adc dma采样为0

bugerror

在stm32 f407的板子上写了一个adc dma采样，发现输出为0。能进中断

1. #define len 1400
   
2. 
   
3. u16 ADC_ConvertedValue[len]={1};
   
4. u16 save[len]={2};
   
5. u16 z;
   
6. extern u16 ecc;
   
7. 
   
8. void ADC_DMA_Config(void)
   
9. {
   
10.         ADC_InitTypeDef ADC_InitStructure;
    
11.         ADC_CommonInitTypeDef ADC_CommonInitStructure;
    
12.         DMA_InitTypeDef DMA_InitStructure;
    
13.         GPIO_InitTypeDef GPIO_InitStructure;
    
14.         NVIC_InitTypeDef NVIC_InitStructure;
    
15. 
    
16.         RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA , ENABLE);
    
17.         RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    
18. 
    
19.         DMA_DeInit(DMA2_Stream0);
    
20.         DMA_InitStructure.DMA_Channel = DMA_Channel_0; //选择通道0
    
21.         DMA_InitStructure.DMA_PeripheralBaseAddr = ((u32)ADC1+0x4c); //外设基地址
    
22.         DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC_ConvertedValue; //数据存放地址
    
23.         DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //设置外设到内存
    
24.         DMA_InitStructure.DMA_BufferSize = len; //设置一次传输数据大小
    
25.         DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址不变
    
26.         DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址递增
    
27.         DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    
28.         DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    
29.         DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //设置为正常模式
    
30.         DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //中等优先级
    
31.         DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
    
32.         DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
    
33.         DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    
34.         DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    
35.         DMA_Init(DMA2_Stream0, &DMA_InitStructure); //初始化
    
36.         DMA_Cmd(DMA2_Stream0, ENABLE);
    
37. 
    
38.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    
39.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    
40.         GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    
41.         GPIO_Init(GPIOA, &GPIO_InitStructure);
    
42. 
    
43.         ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; //独立模式
    
44.         ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4; //4分频
    
45.         ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
    
46.         ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; //两次采样间隔5周期
    
47.         ADC_CommonInit(&ADC_CommonInitStructure);
    
48. 
    
49.         ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //12位模式
    
50.         ADC_InitStructure.ADC_ScanConvMode = DISABLE; //关闭扫描模式
    
51.         ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //单次转换
    
52.         ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; //软件触发
    
53.         ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //右对齐
    
54.         ADC_InitStructure.ADC_NbrOfConversion = 1;
    
55.         ADC_Init(ADC1, &ADC_InitStructure);
    
56. 
    
57.         ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 1, ADC_SampleTime_3Cycles); //采样3周期
    
58.         ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
    
59.         ADC_DMACmd(ADC1, ENABLE);
    
60.         ADC_Cmd(ADC1, ENABLE);
    
61. 
    
62.         DMA_ITConfig(DMA2_Stream0,DMA_IT_TC,ENABLE); //开启传输完成中断
    
63.         NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
    
64.         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0X00;
    
65.         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0X01;
    
66.         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    
67.         NVIC_Init(&NVIC_InitStructure);
    
68. }
    
69. 
    
70. void DMA2_Stream0_IRQHandler(void)
    
71. {
    
72.         if(DMA_GetFlagStatus(DMA2_Stream0,DMA_FLAG_TCIF0)==SET) //传输完成标志
    
73.                 {
    
74.                         DMA_Cmd(DMA2_Stream0,DISABLE);
    
75.                         if(ecc) //主函数里面的东西，防止在打印的时候写入
    
76.                         {
    
77.                                 for(z=0;z<len;z++)
    
78.                                 save[z]=ADC_ConvertedValue[z];
    
79.                         }
    
80.                         DMA_ClearFlag(DMA2_Stream0,DMA_FLAG_TCIF0); //清除传输完成中断
    
81.                         DMA_SetCurrDataCounter(DMA2_Stream0,len);
    
82.                         DMA_Cmd(DMA2_Stream0,ENABLE);
    
83.     }
    
84. }

复制代码

bugerror

解决了，这里没问题，主函数标志位设置有误

peng1554

看能参考帖子不
http://www.openedv.com/forum.php?mod=viewthread&tid=290039

bugerror

peng1554 发表于 2019-9-2 12:54
看能参考帖子不
http://www.openedv.com/forum.php?mod=viewthread&tid=290039

以前看到过，没用