STM32:PWM控制LED达到呼吸灯效果

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "PWM.h"
uint8_t i;
int main(void)
{
    OLED_Init();    
    PWM_Init();
    while(1)
    {
        for(i=0;i<=100;i++)
        {
            PWM_SetCompare(i);
            Delay_ms(10);
        }
        for(i=0;i<=100;i++)
        {
            PWM_SetCompare(100-i);
            Delay_ms(10);
        }
    }
}

#include "stm32f10x.h"                  // Device header
void PWM_Init(void)
{
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
    TIM_TimeBaseInitStruct.TIM_ClockDivision=TIM_CKD_DIV1;
    TIM_TimeBaseInitStruct.TIM_CounterMode=TIM_CounterMode_Up;
    TIM_TimeBaseInitStruct.TIM_Period=100-1;
    TIM_TimeBaseInitStruct.TIM_Prescaler=720-1;
    TIM_TimeBaseInitStruct.TIM_RepetitionCounter=0;
    TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStruct);
    TIM_InternalClockConfig(TIM2);
    TIM_OCInitTypeDef TIM_OCInitStruct;
    TIM_OCInitStruct.TIM_OCMode=TIM_OCMode_PWM1;
    TIM_OCInitStruct.TIM_OCPolarity=TIM_OCPolarity_High;
    TIM_OCInitStruct.TIM_OutputState=TIM_OutputState_Enable;
    TIM_OCInitStruct.TIM_Pulse=50;
    TIM_OC1Init(TIM2,&TIM_OCInitStruct);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
    GPIO_InitTypeDef GPIO_InitStruct;
    GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF_PP;
    GPIO_InitStruct.GPIO_Pin=GPIO_Pin_0;
    GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
    GPIO_Init(GPIOA,&GPIO_InitStruct);
    TIM_Cmd(TIM2,ENABLE);
}
void PWM_SetCompare(uint8_t Compare)
{
    TIM_SetCompare1(TIM2,Compare);
}

#ifndef  __PWM_H
#define  __PWM_H
void PWM_SetCompare(uint8_t Compare);
void PWM_Init(void);
#endif