stm32f407 adc dma 读到的数据一直为0？

2019-07-20 09:28发布

本帖最后由 x20130927 于 2017-9-22 21:15 编辑

#include "adc.h"
#include "dma.h"
#include "lcd.h"
#include "sys.h"
#include "delay.h"
#include "usart.h"
u16 ADCData[50];

void main()
{
  u16 adcx=0;
      char i=0;
      float temp;
      Stm32_Clock_Init(336,8,2,7);
      delay_init(168);
      uart_init(84,115200);
      LCD_Init();

      MYDMA_Config(DMA2_Stream0, 0,(u32)&ADC1->DR, (u32)ADCData,50);
      Adc_Init();
      POINT_COLOR=RED;
      LCD_ShowString(30,50,200,16,16,"Explorer STM32F4");
      LCD_ShowString(30,70,200,16,16,"ADC TEST");
      LCD_ShowString(30,90,200,16,16,"ATOM@ALIENTEK");
      LCD_ShowString(30,110,200,16,16,"2014/5/6");
      POINT_COLOR=BLUE;
      LCD_ShowString(30,130,200,16,16,"ADC1_CH5_VAL:");
      LCD_ShowString(30,150,200,16,16,"ADC1_CH5_VOL:0.000V");

      while(1)
      {
            for(i=0;i<50;i++)
      {
                  adcx=adcx+ADCData;
      }
               adcx=adcx/50;
               LCD_ShowxNum(134,130,adcx,4,16,0);
               temp=(float)adcx*(3.3/4096);
               adcx=temp;
               LCD_ShowxNum(134,150,adcx,1,16,0);
               temp-=adcx;
               temp*=1000;
               LCD_ShowxNum(150,150,temp,3,16,0X80);
      }
}

#include "adc.h"
#include "delay.h"
void  Adc_Init(void)
{

      RCC->APB2ENR|=1<<8;
      RCC->AHB1ENR|=1<<0;
      GPIO_Set(GPIOA,PIN5,GPIO_MODE_AIN,0,0,GPIO_PUPD_PU);
      RCC->APB2RSTR|=1<<8;
      RCC->APB2RSTR&=~(1<<8);

      ADC->CCR=3<<16;
   ADC->CCR=~(3<<14);
      ADC1->CR1=0;
      ADC1->CR2=0;
      ADC1->CR2 |= 1<<9;
      ADC1->CR2 |= 1<<8;
      ADC1->CR1|=0<<24;
      ADC1->CR1|=0<<8;
      ADC1->CR1&=~(1<<5);
      ADC1->CR2|=1<<1;
      ADC1->CR2&=~(1<<11);
      ADC1->CR2|=0<<28;

      ADC1->SQR1&=~(0XF<<20);
      ADC1->SQR1|=0<<20;
      ADC1->SMPR2&=~(7<<(3*5));
      ADC1->SMPR2|=7<<(3*5);

      ADC1->CR2|=1<<0;
}

u16 Get_Adc(u8 ch)
{
      //éèÖÃ×a»»DòáD
      ADC1->SQR3&=0XFFFFFFE0;
      ADC1->SQR3|=ch;
      ADC1->CR2|=1<<30;
      while(!(ADC1->SR&1<<1));
      return ADC1->DR;
}

u16 Get_Adc_Average(u8 ch,u8 times)
{
      u32 temp_val=0;
      u8 t;
      for(t=0;t<times;t++)
      {
            temp_val+=Get_Adc(ch);
            delay_ms(5);
      }
      return temp_val/times;
}

#include "dma.h"
#include "delay.h"
void MYDMA_Config(DMA_Stream_TypeDef *DMA_Streamx,u8 chx,u32 par,u32 mar,u16 ndtr)
{
      DMA_TypeDef *DMAx;
      u8 streamx;
      if((u32)DMA_Streamx>(u32)DMA2)
      {
            DMAx=DMA2;
            RCC->AHB1ENR|=1<<22;
      }else
      {
            DMAx=DMA1;
               RCC->AHB1ENR|=1<<21;
      }
      while(DMA_Streamx->CR&0X01);//μè′yDMA¿éÅäÖÃ
      streamx=(((u32)DMA_Streamx-(u32)DMAx)-0X10)/0X18;
      if(streamx>=6)DMAx->HIFCR|=0X3D<<(6*(streamx-6)+16);
      else if(streamx>=4)DMAx->HIFCR|=0X3D<<6*(streamx-4);
      else if(streamx>=2)DMAx->LIFCR|=0X3D<<(6*(streamx-2)+16);
      else DMAx->LIFCR|=0X3D<<6*streamx;

      DMA_Streamx->PAR=par;
      DMA_Streamx->M0AR=mar;
      DMA_Streamx->NDTR=ndtr;
      DMA_Streamx->CR=0;

      DMA_Streamx->CR&=~(3<<6);
      DMA_Streamx->CR|=1<<8;
      DMA_Streamx->CR|=0<<9;
      DMA_Streamx->CR|=1<<10;
      DMA_Streamx->CR|=1<<11;
      DMA_Streamx->CR|=1<<13;
      DMA_Streamx->CR|=1<<16;
      DMA_Streamx->CR|=0<<21;
      DMA_Streamx->CR|=0<<23;
      DMA_Streamx->CR|=(u32)chx<<25;
      DMA_Streamx->FCR&=0xffffff40;
      DMA_Streamx->FCR|=0x07;
      DMA_Streamx->CR|=1<<0;
}

void MYDMA_Enable(DMA_Stream_TypeDef *DMA_Streamx,u16 ndtr)
{
      DMA_Streamx->CR&=~(1<<0);
      while(DMA_Streamx->CR&0X1);
      DMA_Streamx->NDTR=ndtr;
      DMA_Streamx->CR|=1<<0;
}

这程序AD值一直为0，求求各位大神帮我指点一下

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