stm32F103 8个流水灯

你可以使用STM32F103的GPIO口控制8个LED灯，实现8个流水灯的效果。下面是一个简单的代码示例：

#include "stm32f10x.h"

int main(void)
{
    // 初始化GPIO口
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    
    // 设置定时器
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    TIM_TimeBaseStructure.TIM_Period = 1000 - 1; // 定时器周期为 1ms
    TIM_TimeBaseStructure.TIM_Prescaler = 7200 - 1; // 定时器预分频为 7200，计数频率为 10kHz
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
    
    // 设置定时器中断
    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
    
    // 启动定时器
    TIM_Cmd(TIM2, ENABLE);
    
    while(1);
}

void TIM2_IRQHandler(void)
{
    static uint8_t led = 0x01;
    GPIO_Write(GPIOB, led);
    led <<= 1;
    if(led == 0x00)
    {
        led = 0x01;
    }
    TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
}

此代码使用定时器中断实现了每1ms更新一次LED灯状态的效果。其中，GPIOB的0~7口分别连接8个LED灯，TIM2定时器的预分频为7200，计数频率为10kHz，所以1ms的定时周期需要计数1000次。在定时器中断中，通过移位操作实现8个LED灯的流水效果。