STM32 ADC DMA方式,为什么我串口输出的值要么是0.86V,要么就是0V,调节电位器没反应！ -

标题: STM32 ADC DMA方式,为什么我串口输出的值要么是0.86V,要么就是0V,调节电位器没反应！ [打印本页]

作者: 8452636 时间: 2018-8-17 09:56
标题: STM32 ADC DMA方式,为什么我串口输出的值要么是0.86V,要么就是0V,调节电位器没反应！

/***********adc.c***********/
#include "adc.h"
#include "SysTick.h"
volatile u16 ADC_ConvertedValue;
void ADC1_Init(void)
{
      GPIO_InitTypeDef  GPIO_InitStruct;
      ADC_InitTypeDef ADC_InitStruct;
      DMA_InitTypeDef DMA_InitStructure;
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_ADC1,ENABLE);
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

      GPIO_InitStruct.GPIO_Pin=GPIO_Pin_1;
      GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AIN
      GPIO_Init(GPIOA,&GPIO_InitStruct);

      DMA_DeInit(DMA1_Channel1);
      DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1->DR;
      DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue
      DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
      DMA_InitStructure.DMA_BufferSize = 1;
      DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable
      DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
      DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
      DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
      DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
      DMA_InitStructure.DMA_Priority = DMA_Priority_High;
      DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
      DMA_Init(DMA1_Channel1, &DMA_InitStructure);

      DMA_Cmd(DMA1_Channel1, ENABLE);

      RCC_ADCCLKConfig(RCC_PCLK2_Div8)

      ADC_InitStruct.ADC_Mode=ADC_Mode_Independent;
      ADC_InitStruct.ADC_NbrOfChannel=1;
      ADC_InitStruct.ADC_ContinuousConvMode=ENABLE
      ADC_InitStruct.ADC_ScanConvMode=DISABLE
      ADC_InitStruct.ADC_ExternalTrigConv=ADC_ExternalTrigConv_None
      ADC_InitStruct.ADC_DataAlign=ADC_DataAlign_Right;
      ADC_Init(ADC1,&ADC_InitStruct);
      ADC_DMACmd(ADC1, ENABLE);
      ADC_Cmd(ADC1,ENABLE);
      ADC_RegularChannelConfig(ADC1,ADC_Channel_1,1,ADC_SampleTime_55Cycles5);

      ADC_ResetCalibration(ADC1)
      while(ADC_GetResetCalibrationStatus(ADC1))
      ADC_StartCalibration(ADC1)
      while(ADC_GetCalibrationStatus(ADC1))
      ADC_SoftwareStartConvCmd(ADC1,ENABLE)
}

/*********************main.c*****************/

#include "system.h"
#include "SysTick.h"
#include "led.h"
#include "usart.h"
#include "adc.h"
extern __IO uint16_t ADC_ConvertedValue;
float ADC_ConvertedValueLocal;
int main(void)
{
      u8 i=0;
      SysTick_Init(72);
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
      LED_Init();
      USART1_Init(9600);
      ADC1_Init();
      while(1)
      {
            i++;

                              ADC_ConvertedValueLocal =(float) ADC_ConvertedValue/4096*3.3
                              printf("êä3öADÖμ￡o%d\r\n", ADC_ConvertedValue);
                              printf("êä3öμçÑ1%.2f V \r\n",ADC_ConvertedValueLocal);
            if(i%20==0)
            {
                     led1=!led1;
            }
                     delay_ms(10);
      }
}

作者: xuyaqi 时间: 2018-8-17 10:51
这和硬件软件都有关系，把有关资料都发出来才好判断。

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