STM32F103 第22章 ADC实验为什么默认开启0~3通道？

卡卡_73 · 发表于 2018-1-30 15:57:34

本帖最后由卡卡_73 于 2018-1-31 09:52 编辑

Adc_Init()函数只是配置PA1引脚啊，应该只开启了通道1，为什么就默认开启了通道0~3？？？
[mw_shl_code=cpp,true]
void  Adc_Init(void)
{
      ADC_InitTypeDef ADC_InitStructure;
      GPIO_InitTypeDef GPIO_InitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1       , ENABLE );

      RCC_ADCCLKConfig(RCC_PCLK2_Div6);


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

      ADC_DeInit(ADC1);

      ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
      ADC_InitStructure.ADC_ScanConvMode = DISABLE;
      ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
      ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
      ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
      ADC_InitStructure.ADC_NbrOfChannel = 1;
      ADC_Init(ADC1, &ADC_InitStructure);


      ADC_Cmd(ADC1, ENABLE);

      ADC_ResetCalibration(ADC1);

      while(ADC_GetResetCalibrationStatus(ADC1));

      ADC_StartCalibration(ADC1);

      while(ADC_GetCalibrationStatus(ADC1));

//       ADC_SoftwareStartConvCmd(ADC1, ENABLE);

}[/mw_shl_code]