stm32f103 TIM8中断

在STM32F103中，TIM8是一个16位定时器，可以用于产生定时中断。要使用TIM8中断，首先需要配置中断优先级和使能中断。然后，在TIM8的中断处理函数中编写相应的代码。可以使用类似下面的代码来配置和处理TIM8中断：

// 配置中断优先级
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = TIM8_IRQn;  // 设置中断通道为TIM8
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  // 设置抢占优先级为0
NVIC_InitStructure.NVIC_IRQChannel＊＊＊Priority = 0;  // 设置子优先级为0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  // 使能中断通道
NVIC_Init(&NVIC_InitStructure);

// 配置TIM8
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 1000;  // 设置计数器周期
TIM_TimeBaseStructure.TIM_Prescaler = 7200;  // 设置预分频值
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  // 设置计数模式为向上计数
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;  // 设置时钟分频因子
TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);

// 使能TIM8更新中断
TIM_ITConfig(TIM8, TIM_IT_Update, ENABLE);

// 编写TIM8中断处理函数
void TIM8_IRQHandler(void) {
    if (TIM_GetITStatus(TIM8, TIM_IT_Update) == SET) {
        // 处理定时器中断事件

        TIM_ClearITPendingBit(TIM8, TIM_IT_Update);  // 清除中断标志位
    }
}

这段代码配置了TIM8的中断优先级为最高，计数器周期为1000，预分频值为7200，并使能了更新中断。在TIM8中断处理函数中，可以编写相应的代码来处理定时器中断事件。最后，通过调用`TIM_ClearITPendingBit`函数清除中断标志位，以退出中断。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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