STM32F030的ADC严重问题

2019-03-23 18:18发布

在使用STM32F030K6T6时,现在只使用了ADC0ADC1PA0PA1两个引脚),发现只要置位具有ADC功能的其他IO口中的任意一个(设置为推挽输出),正在采样的ADC引脚(PA0PA1)就会被附加上一个26K左右的方波信号,幅值大概在2~3V将选中的ADC引脚(PA0PA1引脚)悬空,这个现象照样存在。ADC,DMA的代码使用DISCOVERY的例程,初始化如下: void ADC_CH_DMA_Config(void){  ADC_InitTypeDef     ADC_InitStructure;  DMA_InitTypeDef     DMA_InitStructure;  GPIO_InitTypeDef    GPIO_InitStructure;  /* ADC1 DeInit */    ADC_DeInit(ADC1);    /* ADC1 Periph clock enable */  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);  /* DMA1 clock enable */  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);           GPIO_InitStructure.GPIO_Pin   =  GPIO_Pin_0 | GPIO_Pin_1 ;  GPIO_InitStructure.GPIO_Mode  =  GPIO_Mode_AN;  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;  //GPIO_InitStructure.GPIO_Speed =  GPIO_Speed_2MHz;  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;  GPIO_Init(GPIOA,  &GPIO_InitStructure);                  GPIO_InitStructure.GPIO_Pin   =  GPIO_Pin_2 | GPIO_Pin_3 ;  GPIO_InitStructure.GPIO_Mode  =  GPIO_Mode_OUT;  GPIO_InitStructure.GPIO_OType =  GPIO_OType_PP;  GPIO_InitStructure.GPIO_Speed =  GPIO_Speed_2MHz;  //GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;  GPIO_Init(GPIOA,  &GPIO_InitStructure);                    /* DMA1 Channel1 Config */  DMA_DeInit(DMA1_Channel1);  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)RegularConvData_Tab;  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;  DMA_InitStructure.DMA_BufferSize = 2;  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;  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);    /* DMA1 Channel1 enable */  DMA_Cmd(DMA1_Channel1, ENABLE);    /* ADC DMA request in circular mode */  ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);    /* Enable ADC_DMA */  ADC_DMACmd(ADC1, ENABLE);     /* Initialize ADC structure */  ADC_StructInit(&ADC_InitStructure);    /* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits  */  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;   ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;  ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Backward;  ADC_Init(ADC1, &ADC_InitStructure);   /* Convert the ADC1 temperature sensor  with 55.5 Cycles as sampling time */   ADC_ChannelConfig(ADC1, ADC_Channel_0 , ADC_SampleTime_55_5Cycles);    ADC_TempSensorCmd(ENABLE);    /* Convert the ADC1 Vref  with 55.5 Cycles as sampling time */   ADC_ChannelConfig(ADC1, ADC_Channel_0 , ADC_SampleTime_55_5Cycles);   ADC_VrefintCmd(ENABLE);    /* ADC Calibration */  ADC_GetCalibrationFactor(ADC1);    /* Enable ADC1 */  ADC_Cmd(ADC1, ENABLE);         /* Wait the ADRDY falg */  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY));     /* ADC1 regular Software Start Conv */   ADC_StartOfConversion(ADC1);} 我只要将PA2,或者PA3在初始化时做如下置位:  ADC_CH_DMA_Config();  GPIO_SetBits(GPIOA, GPIO_Pin_3); PA0PA1引脚上就会出现方波信号。 此帖出自小平头技术问答
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