- #include "time.h"
- #include "led.h"
- void TIM3_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
- void TIM3_Int_Init(u16 arr,u16 psc)
- {
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能TIM3时钟
- TIM_TimeBaseStructure.TIM_Period = arr; //指定下次更新事件时要加载到活动自动重新加载寄存器中的周期值。
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //指定用于划分TIM时钟的预分频器值。
- TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //时钟分频因子
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM计数模式，向上计数模式
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx的时间基数单位
- TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //使能TIM3中断，允许更新中断
- //初始化TIM NVIC，设置中断优先级分组
- NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3中断
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //设置抢占优先级0
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //设置响应优先级3
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //使能通道1中断
- NVIC_Init(&NVIC_InitStructure); //初始化NVIC
- TIM_Cmd(TIM3, ENABLE); //TIM3使能
- }
- void TIM3_IRQHandler(void)
- {
- static u8 i=0;
- if(TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查TIM3中断是否发生。
- {
- TIM_ClearITPendingBit(TIM3,TIM_IT_Update); //清除TIM3的中断挂起位。
- printf("Enter interrupt\n");
- GPIO_WriteBit(GPIOA, GPIO_Pin_1, (i==0) ? (i=Bit_SET):(i=Bit_RESET));
- }
- }
| 
楼主
