定时器操作步骤

来源：互联网发布：禅道linux安装教程编辑：程序博客网时间：2024/06/01 09:32

void NVIC_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
/* Enable the TIM3 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn; //TIM4中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占优先级0级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //从优先级3级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器

}

void TIM4_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_DeInit(TIM4);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
// TIM_TimeBaseStructure.TIM_Period=10000;//ARR的值 //计数值
// TIM_TimeBaseStructure.TIM_Prescaler=7200-1; //分频2
//定时1.5ms 用于数码管显示
TIM_TimeBaseStructure.TIM_Period=14;//ARR的值 //计数值
TIM_TimeBaseStructure.TIM_Prescaler=7200-1; //分频2
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE);
TIM_Cmd(TIM4, ENABLE); //开启时钟
}

/*
定时时间计算：
TIM_TimeBaseStructure.TIM_Prescaler = 2; //分频2 72M/(2+1)/2=24MHz
TIM_TimeBaseStructure.TIM_Period = 65535; //计数值65535
((1+TIM_Prescaler )/72M)*(1+TIM_Period )=((1+2)/72M)*(1+65535)=0.00273秒=366.2Hz
*/

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