3通道ADC采集，DMA方式，然后串口发送给上位机

fengruixin1992 · 发表于 2019-3-28 14:34:44

本帖最后由 fengruixin1992 于 2019-3-28 15:24 编辑

我是在原子哥ADC的例程结合串口通信例程和DMA例程上改的，但是用串口调试助手试了，没任何数据，程序编译没问题，求指教哪点有问题，急求!!!，用16进制显示，显示出来的都是00
void  Adc_Init(u16 mar)
{
  GPIO_InitTypeDef  GPIO_InitStructure;
  ADC_CommonInitTypeDef ADC_CommonInitStructure;
  ADC_InitTypeDef    ADC_InitStructure;
  DMA_InitTypeDef  DMA_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//IO口使能
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //APB2时钟使能

//初始化ADC1的通道0、1、5
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

      RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE);         //ADC1复位
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE);       //使能ADC1时钟
//DMA初始化
  DMA_InitStructure.DMA_Channel = DMA_Channel_0; //选择DMA通道0
  DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&ADC1->DR;//外设地址
  DMA_InitStructure.DMA_Memory0BaseAddr = mar;//DMA 目标内存地址
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//外设到内存
  DMA_InitStructure.DMA_BufferSize = 3;//数据传输量
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设非增量模式
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//内存增量模式
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//外设半字传输
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//内存半字传输
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//DMA循环模式
  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//优先级
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA2_Stream0, &DMA_InitStructure);

      DMA_Cmd(DMA2_Stream0, ENABLE); //使能DMA2的数据流0
//ADC1初始化
  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//独立模式
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//转换间隔时钟周期
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1; //DMA使能模式1
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;//
  ADC_CommonInit(&ADC_CommonInitStructure);//ˉ

  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;//12位采样
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;/扫描模式
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;//连续转换
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;//软件触发
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//右对齐
  ADC_InitStructure.ADC_NbrOfConversion = 3;//3个通道数
  ADC_Init(ADC1, &ADC_InitStructure);//初始化ADC1

      ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_480Cycles );
      ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_480Cycles );
      ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 3, ADC_SampleTime_480Cycles );


      ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
      ADC_DMACmd(ADC1, ENABLE);//使能ADC1的DMA
      ADC_Cmd(ADC1, ENABLE);/使能ADC1

}

//主函数
#define BUF_NUM 3
u16 buffer[BUF_NUM];
int main(void)
{
      u8 t;
      u8 data1;
      u8 data2;
      u16 adcx;
      float temp;
      delay_init(168);
      uart_init(115200);
      LED_Init();
      Adc_Init((u32)buffer);
      while(1)
      {
      for(t=0;t<3;t++)
                     {
                              data1=(buffer[t]>>8)&0xFF;    //AD是12位的，获取高8位数据
                              USART_SendData(USART1, data1);       //向串口1发送数据
                              while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);//等待串口发送完成
                              data2=buffer[t]&0xFF; //获取AD低8位数据
                              USART_SendData(USART1, data2);
                              while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);
                              LED0=!LED0;
                              delay_ms(10);
                     }
      }
}