stm32f407 ADC读取电压代码

以下是一个简单的 stm32f407 ADC 读取电压的代码示例：

#include "stm32f4xx.h"

int main(void)
{
    // 初始化 ADC1
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    ADC_InitTypeDef ADC_InitStruct;
    ADC_StructInit(&ADC_InitStruct);
    ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStruct.ADC_ScanConvMode = DISABLE;
    ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
    ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStruct.ADC_NbrOfConversion = 1;
    ADC_Init(ADC1, &ADC_InitStruct);
    ADC_Cmd(ADC1, ENABLE);

    // 初始化 GPIOA
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    GPIO_InitTypeDef GPIO_InitStruct;
    GPIO_StructInit(&GPIO_InitStruct);
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    // 等待 ADC 启动
    while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADONS));

    // 读取 ADC 值
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_3Cycles);
    ADC_SoftwareStartConv(ADC1);
    while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
    uint16_t adc_value = ADC_GetConversionValue(ADC1);

    // 计算电压值
    float voltage = adc_value / 4096.0 * 3.3;

    // 此处可以将电压值输出到串口或 LCD 显示屏等设备上

    while(1);
}