STM32F207 ADC3读取数据出错

只看该作者 · 2015-3-5 15:16

故障现象：连续循环扫描8个通道，发现读取的数据1和3通道数据相同，2通道和4通道数据相同，硬件上1通道和3通道,2通道和4通道是独立的，如果1通道读的是300的话，3通道读也是300（3是没电压的），如果3通道读的是300的话，1通道读也是300（1是没电压的），这是什么情况啊？同一个芯片上还使用了ADC1，也是独立连续循环扫描模式，通道都正常，ADC3配置哪里出错呢？
ADC3口配置如下：
void ADC3_Configuration(void)
{
//GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
  DMA_InitTypeDef DMA_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3,ENABLE);// ADC3的时钟信号
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF,ENABLE); //DMA，F口的时钟信号
//  RCC_ADCCLKConfig(RCC_PCLK2_Div6);
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); //DMA，F口的时钟信号

/* ADC3 configuration ------------------------------------------------------*/
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//ADC模块独立工作模式
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div8;//  //ADC采样周期8分频
  //ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_20Cycles; //采样周期
  ADC_CommonInit(&ADC_CommonInitStructure);

//DMA_DeInit(DMA2_Stream0);
DMA_InitStructure.DMA_Channel=DMA_Channel_2;
  DMA_InitStructure.DMA_PeripheralBaseAddr = ADC3_DR_ADDRESS;//ADC1接口寄存器首地址外设地址
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC3_Value;//定义寄存器基址//ADC结果地址
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//定义DMA传输模式从外设到内存
  DMA_InitStructure.DMA_BufferSize = 80;// 13*10  //设置DMA在传输时缓冲区的长度 word/
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//设置DMA的外设递增模式/
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//设置DMA的内存递增模式/
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;////DMA外设数据大小，16位半字
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;////DMA存储器数据大小，16位半字
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//设置DMA的传输模式：连续不断的循环模式/
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;//设置DMA的优先级别/
DMA_InitStructure.DMA_FIFOMode= DMA_FIFOMode_Disable; //直接传输模式无效
  DMA_InitStructure.DMA_FIFOThreshold= DMA_FIFOThreshold_HalfFull;
  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);/* Enable DMA1 channel1 */

//  ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;//ADC采样精度
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;//采用扫描模式，因为多路
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;//连续扫描模式
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConvEdge_None;;//无外部触发
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 8;//  通道个数8
  ADC_Init(ADC3, &ADC_InitStructure);
//ADC_ContinuousModeCmd(ADC2,ENABLE);

  /* ADC1 regular channel configuration */
  ADC_RegularChannelConfig(ADC3, ADC_Channel_4, 1, ADC_SampleTime_15Cycles);
ADC_RegularChannelConfig(ADC3, ADC_Channel_5, 2, ADC_SampleTime_15Cycles);
ADC_RegularChannelConfig(ADC3, ADC_Channel_6, 3, ADC_SampleTime_15Cycles);
ADC_RegularChannelConfig(ADC3, ADC_Channel_7, 4, ADC_SampleTime_15Cycles);
ADC_RegularChannelConfig(ADC3, ADC_Channel_8, 5, ADC_SampleTime_15Cycles);
ADC_RegularChannelConfig(ADC3, ADC_Channel_9, 6, ADC_SampleTime_15Cycles);
ADC_RegularChannelConfig(ADC3, ADC_Channel_14, 7, ADC_SampleTime_15Cycles);
ADC_RegularChannelConfig(ADC3, ADC_Channel_15, 8, ADC_SampleTime_15Cycles);

  ADC_DMARequestAfterLastTransferCmd(ADC3, ENABLE);
  ADC_DMACmd(ADC3, ENABLE); /* Enable ADC3 DMA */
  ADC_Cmd(ADC3, ENABLE);/* Enable ADC3 */
  ADC_SoftwareStartConv(ADC3);/* Start ADC3 Software Conversion */
}

3万 · 2015-3-5 19:04

#define ADC1_DR_Address ((uint32_t)0x4001244C)
#define ADCN 128 //每通道采16次
#define ADCM 16 //为16个通道

vu16 AD_ConvertedValue[ADCN][ADCM]; //用来存放ADC转换结果，也是DMA的目标地址
vu16 After_filter[ADCM]; //用来存放求平均值之后的结果

void ADC1_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;

/* Enable DMA1 clock */
RCC_ADCCLKConfig(RCC_PCLK2_Div8);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC|RCC_APB2Periph_ADC1 ,ENABLE);

//PC2--PC3 PA0--PA7 PC4--PC5  PB0--PB1
//PA0/1/2 作为模拟通道输入引脚
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0| GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4| GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚
GPIO_Init(GPIOA, &GPIO_InitStructure);

//PB0--1 作为模拟通道输入引脚
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚
GPIO_Init(GPIOC, &GPIO_InitStructure);

DMA_DeInit(DMA1_Channel1); //将DMA的通道1寄存器重设为缺省值
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&ADC1->DR; //DMA外设ADC基地址
//DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&AD_ConvertedValue; //DMA内存基地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //内存作为数据传输的目的地
DMA_InitStructure.DMA_BufferSize = ADCN*ADCM; //DMA通道的DMA缓存的大小
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址寄存器递增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //数据宽度为16位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //数据宽度为16位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //工作在循环缓存模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA通道 x拥有高优先级
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //DMA通道x没有设置为内存到内存传输
DMA_Init(DMA1_Channel1, &DMA_InitStructure); //根据DMA_InitStruct中指定的参数初始化DMA的通道

DMA_Cmd(DMA1_Channel1, ENABLE);

ADC_DeInit(ADC1); //将外设 ADC1 的全部寄存器重设为缺省值

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC工作模式:独立模式
ADC_InitStructure.ADC_ScanConvMode =ENABLE; //模数转换工作在扫描模式
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //模数转换工作在连续转换模式
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //外部触发转换关闭
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC数据右对齐
ADC_InitStructure.ADC_NbrOfChannel = ADCM; //顺序进行规则转换的ADC通道的数目
ADC_Init(ADC1, &ADC_InitStructure); //根据ADC_InitStruct中指定的参数初始化外设ADCx的寄存器

//设置指定ADC的规则组通道，设置它们的转化顺序和采样时间
//ADC1,ADC通道x,规则采样顺序值为y,采样时间为239.5周期
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 5, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 6, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 7, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 8, ADC_SampleTime_239Cycles5 );

ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 9, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 10, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 11, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 12, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 13, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 14, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 15, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 16, ADC_SampleTime_239Cycles5 );

   /* Enable ADC1 DMA */
  ADC_DMACmd(ADC1, ENABLE);

ADC_Cmd(ADC1, ENABLE); //使能指定的ADC1
ADC_ResetCalibration(ADC1); //复位指定的ADC1的校准寄存器
while(ADC_GetResetCalibrationStatus(ADC1)); //获取ADC1复位校准寄存器的状态,设置状态则等待
ADC_StartCalibration(ADC1); //开始校准
while(ADC_GetCalibrationStatus(ADC1)); //获取指定ADC1的校准程序,设置状态则等待
ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能ADC的软件转换启动功能

/* Test on DMA1 channel1 transfer complete flag */
  while(!DMA_GetFlagStatus(DMA1_FLAG_TC1));
  /* Clear DMA1 channel1 transfer complete flag */
  DMA_ClearFlag(DMA1_FLAG_TC1);
}