stm32 adc采集光敏传感器模块的模拟输出脚A0的值

#include "stm32f10x.h"                  // Device header
#include "delay.h"
#include "stdio.h"
unsigned int a;
int fputc(int ch, FILE *f)//重定义打印函数，可以使用printf
{       
	while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); 
    USART_SendData(USART1, (uint8_t)ch);      //USART1->DR = (u8) ch
    return ch;
}
int  main(void)
{
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
	
	GPIO_InitTypeDef GPIO_STRUTURE;
	GPIO_STRUTURE.GPIO_Mode=GPIO_Mode_AF_PP;
	GPIO_STRUTURE.GPIO_Pin=GPIO_Pin_9;
	GPIO_STRUTURE.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO_STRUTURE);
	GPIO_STRUTURE.GPIO_Mode=GPIO_Mode_IPU;
	GPIO_STRUTURE.GPIO_Pin=GPIO_Pin_10;
	GPIO_Init(GPIOA,&GPIO_STRUTURE);
	GPIO_STRUTURE.GPIO_Mode=GPIO_Mode_AIN;
	GPIO_STRUTURE.GPIO_Pin=GPIO_Pin_1;//adc1对应
	GPIO_Init(GPIOA,&GPIO_STRUTURE);
	
	
	USART_InitTypeDef USART_STRUTURE;
	USART_STRUTURE.USART_BaudRate=9600;
	USART_STRUTURE.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
	USART_STRUTURE.USART_Mode=USART_Mode_Tx| USART_Mode_Rx;
	USART_STRUTURE.USART_Parity=USART_Parity_No;
	USART_STRUTURE.USART_StopBits=USART_StopBits_1;
	USART_STRUTURE.USART_WordLength=USART_WordLength_8b;
	USART_Init(USART1,&USART_STRUTURE);
	USART_Cmd(USART1,ENABLE);//串口设置
	
	RCC_ADCCLKConfig(RCC_PCLK2_Div6);
	ADC_DeInit(ADC1);
	ADC_InitTypeDef ADC_STRUTURE;
	ADC_STRUTURE.ADC_ContinuousConvMode=DISABLE;
	ADC_STRUTURE.ADC_DataAlign=ADC_DataAlign_Right;
	ADC_STRUTURE.ADC_ExternalTrigConv=ADC_ExternalTrigConv_None;
	ADC_STRUTURE.ADC_Mode=ADC_Mode_Independent;
	ADC_STRUTURE.ADC_NbrOfChannel=1;
	ADC_STRUTURE.ADC_ScanConvMode=DISABLE;
	ADC_Init(ADC1,&ADC_STRUTURE);
	ADC_Cmd(ADC1,ENABLE);
	ADC_ResetCalibration(ADC1);
	while(ADC_GetResetCalibrationStatus(ADC1));
	ADC_StartCalibration(ADC1);
	while(ADC_GetCalibrationStatus(ADC1));//adc配置
	
	
	printf("你好，hello,world!\r\n");//复位键按下输出
	delay(1000);
	while(1)
	{
		ADC_RegularChannelConfig(ADC1,ADC_Channel_1,1,ADC_SampleTime_239Cycles5);
		ADC_SoftwareStartConvCmd(ADC1,ENABLE);
		while(ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC)== RESET);
		a=ADC_GetConversionValue(ADC1);
		printf("ADC采集值：%d\r\n", a);//循环输出
	    delay(1000) ;		
	}
}

光照从暗（遮挡）到亮，值越小