在stm32中用定时器中断和外部中断实现PE0-15口流水灯，0.2s亮0.2s灭，每按一次PA0流水方向变换一次。给我代码

好的，以下是实现代码：

#include "stm32f10x.h"

#define LED_ALL 0x0000FFFF

uint16_t led_mask = 0x0001;
uint32_t last_time = 0;
uint32_t debounce_time = 0;

void init_GPIO(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  // 初始化PE0-15为输出口
  GPIO_InitStructure.GPIO_Pin = LED_ALL;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOE, &GPIO_InitStructure);

  // 初始化PA0为输入口
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void init_TIM2(void)
{
  TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

  // 定时器2初始化，计数频率为72MHz
  TIM_TimeBaseInitStruct.TIM_Prescaler = 7200 - 1; // 分频器72
  TIM_TimeBaseInitStruct.TIM_Period = 2000 - 1;    // 计数周期2000
  TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);

  TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

  TIM_Cmd(TIM2, ENABLE);
}

void init_EXTI0(void)
{
  EXTI_InitTypeDef EXTI_InitStruct;
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStruct;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);

  EXTI_InitStruct.EXTI_Line = EXTI_Line0;
  EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
  EXTI_InitStruct.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStruct);

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

void TIM2_IRQHandler(void)
{
  if (TIM_GetITStatus(TIM2, TIM_IT_Update) == SET) {
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

    // 翻转流水灯方向
    if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0)) {
      if (millis() - debounce_time > 50) {
        debounce_time = millis();

        if (led_mask & 0x8000) {
          led_mask = 0x0001;
        } else {
          led_mask <<= 1;
        }
      }
    }

    // 更新LED状态
    uint16_t led_output = 0;
    if (GPIO_ReadOutputDataBit(GPIOE, LED_ALL & led_mask))
      led_output |= led_mask;
    GPIO_Write(GPIOE, led_output);
  }
}

void EXTI0_IRQHandler(void)
{
  EXTI_ClearITPendingBit(EXTI_Line0);
}

int main(void)
{
  SystemInit();
  init_GPIO();
  init_TIM2();
  init_EXTI0();

  while (1) {
  }

  return 0;
}

这是一个使用定时器中断和外部中断实现PE0-15口流水灯的代码，每个灯需要使用PE0-15口控制。0.2秒内每个灯亮起一次，然后熄灭。PA0为流水灯切换方向的按钮，按一下会改变流水灯方向。