代碼編譯，仿真運行時均不報錯，就是LDR PA0引腳讀出的數(shù)據(jù)一直為0，用探針實際測量有電壓
單片機為STM32F103R6
光敏電阻連接在PA0，電路連接如下圖所示（嘗試過在LDR引腳處加電阻，有電壓讀出數(shù)據(jù)還為0）
adc初始化代碼
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1|RCC_APB2Periph_GPIOA,ENABLE);
- GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AIN;
- GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOA,&GPIO_InitStruct);
- RCC_ADCCLKConfig(RCC_PCLK2_Div6);
- ADC_DeInit(ADC1);
- ADC_InitStruct.ADC_Mode = ADC_Mode_Independent;
- ADC_InitStruct.ADC_ScanConvMode = DISABLE;
- ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;
- ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
- ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
- ADC_InitStruct.ADC_NbrOfChannel = 1;
- ADC_Init(ADC1,&ADC_InitStruct);
-
- ADC_RegularChannelConfig(ADC1,ADC_Channel_0,1,ADC_SampleTime_239Cycles5);
- ADC_Cmd(ADC1,ENABLE);
-
- //ADC_SoftwareStartConvCmd(ADC1,ENABLE);
-
- ADC_ResetCalibration(ADC1);
- delay_ms(500);
- //while(ADC_GetResetCalibrationStatus(ADC1)){OLED_ShowString(0,36,"LSENS Reset...",12);OLED_Refresh_Gram();};
- ADC_StartCalibration(ADC1);
- delay_ms(500);
- //while(ADC_GetCalibrationStatus(ADC1)){OLED_ShowString(0,36,"LSENS Strat...",12);OLED_Refresh_Gram();};
讀取adc值代碼
- while(ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC));
- return ADC_GetConversionValue(ADC1);
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