stm32F103用pwm控制led灯的亮度，一个按键用来增加亮度，一个按键用来减少亮度，并用oled显示灯的亮度等级，用keil编写代码

下面是使用TIM3 PWM功能控制LED灯亮度，使用按键控制亮度加减，并用OLED显示当前亮度等级的代码：

#include "stm32f10x.h"
#include "OLED.h"

#define LED_PIN GPIO_Pin_6
#define LED_PORT GPIOA

#define BUTTON_INC_PIN GPIO_Pin_0
#define BUTTON_DEC_PIN GPIO_Pin_1
#define BUTTON_PORT GPIOB

volatile int brightness = 0;
volatile int display_brightness = 0;

void TIM3_IRQHandler(void) {
    if (TIM_GetITStatus(TIM3, TIM_IT_CC1)) {
        TIM_ClearITPendingBit(TIM3, TIM_IT_CC1);
        TIM_OC1InitTypeDef TIM_OCInitStructure;
        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
        TIM_OCInitStructure.TIM_Pulse = ((uint16_t) brightness * 1000) / 255;
        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
        TIM_OC1Init(TIM3, &TIM_OCInitStructure);
    }
}

void EXTI0_IRQHandler(void) {
    if (EXTI_GetITStatus(EXTI_Line0) != RESET) {
        EXTI_ClearITPendingBit(EXTI_Line0);
        if (brightness < 255) {
            brightness++;
            display_brightness = brightness;
            OLED_ShowInt(0, 2, display_brightness, 1, 12);
        }
    }
}

void EXTI1_IRQHandler(void) {
    if (EXTI_GetITStatus(EXTI_Line1) != RESET) {
        EXTI_ClearITPendingBit(EXTI_Line1);
        if (brightness > 0) {
            brightness--;
            display_brightness = brightness;
            OLED_ShowInt(0, 2, display_brightness, 1, 12);
        }
    }
}

void TIM3_Configuration(void) {
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    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);

    TIM_TimeBaseStructure.TIM_Period = 1000;
    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    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_ITConfig(TIM3, TIM_IT_CC1, ENABLE);
    TIM_Cmd(TIM3, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void BUTTON_Configuration(void) {
    GPIO_InitTypeDef GPIO_InitStructure;
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);

    GPIO_InitStructure.GPIO_Pin = BUTTON_INC_PIN | BUTTON_DEC_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(BUTTON_PORT, &GPIO_InitStructure);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource0);
    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);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource1);
    EXTI_InitStructure.EXTI_Line = EXTI_Line1;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    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);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void OLED_Configuration(void) {
    OLED_Init();
    OLED_Clear();
    OLED_ShowString(0, 0, "LED Brightness");
    OLED_ShowInt(0, 2, display_brightness, 1, 12);
}

int main(void) {
    TIM3_Configuration();
    BUTTON_Configuration();
    OLED_Configuration();

    while (1) {
    }
}

使用TIM3的PWM功能控制LED灯的亮度，使用EXTI0和EXTI1中断处理函数来处理按键按下事件，OLED显示当前亮度等级。