用stm32和Keil5完成：使用按键/ADC/LED，实现电位器控制LED亮度，按键控制LED以该亮度进行呼吸灯开关和闪烁分模块代码

好的，下面是用STM32和Keil5实现电位器控制LED亮度，按键控制LED以该亮度进行呼吸灯开关和闪烁的分模块代码：

//头文件
#include "stm32f10x.h"
#include "delay.h"

//宏定义
#define LED_Pin GPIO_Pin_13
#define LED_Port GPIOC
#define KEY_Pin GPIO_Pin_0
#define KEY_Port GPIOA
#define ADC_Channel ADC_Channel_0
#define ADC_Port GPIOA
#define ADC_Pin GPIO_Pin_0
#define ADC_CLK RCC_APB2Periph_ADC1

//变量定义
__IO uint16_t ADC_Value = 0;
__IO uint16_t LED_Brightness = 0;
__IO uint8_t LED_State = 0;

//函数声明
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void ADC_Configuration(void);
void TIM_Configuration(void);
void EXTI_Configuration(void);
void LED_Breath(void);
void LED_Flash(void);

int main(void)
{
    RCC_Configuration();
    GPIO_Configuration();
    NVIC_Configuration();
    ADC_Configuration();
    TIM_Configuration();
    EXTI_Configuration();

    while(1)
    {
        ADC_SoftwareStartConvCmd(ADC1, ENABLE);
        while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
        ADC_Value = ADC_GetConversionValue(ADC1);
        LED_Brightness = ADC_Value / 4; //将ADC值映射到0-255
        if(LED_State == 1)
        {
            LED_Breath();
        }
        else if(LED_State == 2)
        {
            LED_Flash();
        }
        else
        {
            GPIO_WriteBit(LED_Port, LED_Pin, Bit_RESET);
        }
    }
}

//RCC配置
void RCC_Configuration(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC | RCC_APB2Periph_ADC1, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
}

//GPIO配置
void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    //LED端口配置
    GPIO_InitStructure.GPIO_Pin = LED_Pin;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(LED_Port, &GPIO_InitStructure);

    //按键端口配置
    GPIO_InitStructure.GPIO_Pin = KEY_Pin;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(KEY_Port, &GPIO_InitStructure);

    //ADC端口配置
    GPIO_InitStructure.GPIO_Pin = ADC_Pin;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(ADC_Port, &GPIO_InitStructure);
}

//NVIC配置
void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

//ADC配置
void ADC_Configuration(void)
{
    ADC_InitTypeDef ADC_InitStructure;

    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, 1, ADC_SampleTime_28Cycles5);

    ADC_Cmd(ADC1, ENABLE);

    ADC_ResetCalibration(ADC1);
    while(ADC_GetResetCalibrationStatus(ADC1));
    ADC_StartCalibration(ADC1);
    while(ADC_GetCalibrationStatus(ADC1));
}

//定时器配置
void TIM_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_InitStructure;

    TIM_InitStructure.TIM_Period = 1000 - 1;
    TIM_InitStructure.TIM_Prescaler = 72 - 1;
    TIM_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_InitStructure);

    TIM_Cmd(TIM3, ENABLE);
}

//外部中断配置
void EXTI_Configuration(void)
{
    EXTI_InitTypeDef EXTI_InitStructure;

    EXTI_InitStructure.EXTI_Line = EXTI_Line0;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);
}

//LED呼吸灯
void LED_Breath(void)
{
    uint8_t i = 0;

    for(i = 0; i < LED_Brightness; i++)
    {
        GPIO_WriteBit(LED_Port, LED_Pin, Bit_SET);
        delay_ms(10);
        GPIO_WriteBit(LED_Port, LED_Pin, Bit_RESET);
        delay_ms(10);
    }

    for(i = LED_Brightness; i > 0; i--)
    {
        GPIO_WriteBit(LED_Port, LED_Pin, Bit_SET);
        delay_ms(10);
        GPIO_WriteBit(LED_Port, LED_Pin, Bit_RESET);
        delay_ms(10);
    }
}

//LED闪烁
void LED_Flash(void)
{
    GPIO_WriteBit(LED_Port, LED_Pin, Bit_SET);
    delay_ms(500);
    GPIO_WriteBit(LED_Port, LED_Pin, Bit_RESET);
    delay_ms(500);
}

//外部中断回调函数
void EXTI0_IRQHandler(void)
{
    if(EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        EXTI_ClearITPendingBit(EXTI_Line0);

        LED_State++;
        if(LED_State > 2)
        {
            LED_State = 0;
        }
    }
}

其中，`delay.h`是自己编写的延时函数头文件，可以根据自己的需要进行修改。`LED_Breath`函数实现了LED呼吸灯效果，`LED_Flash`函数实现了LED闪烁效果。在`main`函数中，通过ADC读取电位器的值，并将其映射到0-255的范围内，然后根据按键状态选择LED的显示模式。按下按键，按照呼吸灯-闪烁-关闭的循环顺序进行。