STM32的AD采集光敏电阻电路的电压并通过串口发送和液晶显示

首先，需要将光敏电阻连接到STM32的ADC模块上，以便测量光敏电阻的电压值。其次，需要配置ADC模块的参数，如采样时间、采样速率等。然后，通过编写代码读取ADC模块的值，并将其转换为电压值。最后，将电压值通过串口发送或显示在液晶屏上。

下面是一个简单的示例代码：

#include "stm32f10x.h"
#include "stdio.h"

#define ADC1_DR_Address ((u32)0x4001244C)

static __IO uint32_t TimingDelay;

void Delay(__IO uint32_t nTime);

void RCC_Configuration(void);
void GPIO_Configuration(void);
void USART_Configuration(void);
void ADC_Configuration(void);

int main(void)
{
    RCC_Configuration();
    GPIO_Configuration();
    USART_Configuration();
    ADC_Configuration();

    while (1)
    {
        ADC_SoftwareStartConvCmd(ADC1, ENABLE);
        while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);

        uint16_t adc_value = ADC_GetConversionValue(ADC1);
        float voltage = (float)adc_value / 4096 * 3.3;

        char buffer[64];
        sprintf(buffer, "Voltage: %.2f V\r\n", voltage);
        USART_SendString(buffer);

        Delay(1000);
    }
}

void RCC_Configuration(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_ADC1 | RCC_APB2Periph_USART1, ENABLE);
}

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void USART_Configuration(void)
{
    USART_InitTypeDef USART_InitStructure;

    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStructure);
    USART_Cmd(USART1, ENABLE);
}

void ADC_Configuration(void)
{
    ADC_InitTypeDef ADC_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_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_239Cycles5);

    ADC_Cmd(ADC1, ENABLE);
}

void USART_SendChar(char ch)
{
    while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
    USART_SendData(USART1, ch);
}

void USART_SendString(char *str)
{
    while (*str)
    {
        USART_SendChar(*str++);
    }
}

void Delay(__IO uint32_t nTime)
{
    TimingDelay = nTime;
    while (TimingDelay != 0);
}

void SysTick_Handler(void)
{
    if (TimingDelay != 0x00)
    {
        TimingDelay--;
    }
}

这段代码中，我们使用了PA0作为ADC输入引脚，PA9作为USART1的TX引脚，PA10作为USART1的RX引脚。在ADC_Configuration函数中，我们配置了ADC1的参数，将PA0作为ADC输入通道，并设置了采样时间。在主函数中，我们通过ADC_GetConversionValue函数读取ADC1的值，并将其转换为电压值。最后，我们将电压值通过USART_SendString函数发送到串口，或者通过LCD显示。