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源码
void tim3_init(void)
{NVIC_InitTypeDef NVIC_InitStructure;TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;//使能TIM3的硬件时钟RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);//配置TIM3的定时时间TIM_TimeBaseStructure.TIM_Period = 10000-1; //自动重载TIM_TimeBaseStructure.TIM_Prescaler = 8400-1; //预分频值为8400 84000000/8400=10000(1S)TIM_TimeBaseStructure.TIM_ClockDivision = 0;TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //从0开始计数，然后计数到TIM_Period这个值就触发中断TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);//配置TIM3的中断触发：时间更新TIM_ITConfig(TIM3,TIM_IT_Update, ENABLE);//配置TIM3的优先级NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //中断号NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //响应优先级NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //打开通道给NVIC管理NVIC_Init(&NVIC_InitStructure);//使能TIM3工作TIM_Cmd(TIM3, ENABLE);
}void TIM3_IRQHandler(void)
{if(TIM_GetITStatus(TIM3,TIM_IT_Update) == SET){PFout(9)^=1; //告诉CPU，已经完成接收中断请求，可以响应新的接收中断请求TIM_ClearITPendingBit(TIM3,TIM_IT_Update);}}
其他外设定时器使用方法
打开对应时钟供电
