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代码

以下是一个简单的示例代码，仅供参考：

#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_adc.h"
#include "stm32f10x_tim.h"

#define LED_PIN GPIO_Pin_13
#define LED_PORT GPIOC
#define BUTTON_PIN GPIO_Pin_0
#define BUTTON_PORT GPIOA
#define POT_PIN GPIO_Pin_1
#define POT_PORT GPIOA

#define PWM_MAX 1000

volatile uint32_t adc_value = 0;
volatile uint16_t pwm_value = 0;
volatile uint8_t mode = 0;

void GPIO_Configuration(void) {
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC, ENABLE);

    // LED pin
    GPIO_InitStructure.GPIO_Pin = LED_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(LED_PORT, &GPIO_InitStructure);

    // Button pin
    GPIO_InitStructure.GPIO_Pin = BUTTON_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(BUTTON_PORT, &GPIO_InitStructure);

    // Potentiometer pin
    GPIO_InitStructure.GPIO_Pin = POT_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(POT_PORT, &GPIO_InitStructure);
}

void ADC_Configuration(void) {
    ADC_InitTypeDef ADC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    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, 1, ADC_SampleTime_55Cycles5);

    ADC_Cmd(ADC1, ENABLE);

    ADC_ResetCalibration(ADC1);
    while (ADC_GetResetCalibrationStatus(ADC1));

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

void TIM_Configuration(void) {
    TIM_OCInitTypeDef TIM_OCInitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

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

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM3, &TIM_OCInitStructure);

    TIM_Cmd(TIM3, ENABLE);
    TIM_CtrlPWMOutputs(TIM3, ENABLE);
}

void EXTI0_IRQHandler(void) {
    if (EXTI_GetITStatus(EXTI_Line0) != RESET) {
        mode++;
        if (mode > 2) {
            mode = 0;
        }
        EXTI_ClearITPendingBit(EXTI_Line0);
    }
}

void ADC1_IRQHandler(void) {
    if (ADC_GetITStatus(ADC1, ADC_IT_EOC) != RESET) {
        adc_value = ADC_GetConversionValue(ADC1);
        pwm_value = adc_value * PWM_MAX / 4096;
        TIM_SetCompare1(TIM3, pwm_value);
        ADC_ClearITPendingBit(ADC1, ADC_IT_EOC);
    }
}

void delay_ms(uint32_t ms) {
    for (volatile uint32_t i = 0; i < ms * 1000; i++);
}

void breathing_light(void) {
    uint16_t step = 10;
    uint16_t delay_time = 10;

    for (uint16_t i = 0; i < PWM_MAX; i += step) {
        TIM_SetCompare1(TIM3, i);
        delay_ms(delay_time);
    }

    for (uint16_t i = PWM_MAX; i > 0; i -= step) {
        TIM_SetCompare1(TIM3, i);
        delay_ms(delay_time);
    }
}

void blinking_light(void) {
    uint16_t delay_time = 100;

    for (uint8_t i = 0; i < 10; i++) {
        TIM_SetCompare1(TIM3, PWM_MAX);
        delay_ms(delay_time);
        TIM_SetCompare1(TIM3, 0);
        delay_ms(delay_time);
    }
}

int main(void) {
    GPIO_Configuration();
    ADC_Configuration();
    TIM_Configuration();

    NVIC_InitTypeDef NVIC_InitStructure;
    EXTI_InitTypeDef EXTI_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_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);

    while (1) {
        switch (mode) {
            case 0:
                break;
            case 1:
                breathing_light();
                break;
            case 2:
                blinking_light();
                break;
            default:
                break;
        }
    }
}

这段代码仅作为参考，实际应用中需要根据具体硬件平台和需求进行修改和优化。