1 #include "led.h" 2 3 void TIM3_Int_Init(u16 arr,u16 psc) 4 { 5 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; 6 NVIC_InitTypeDef NVIC_InitStructure; 7 8 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //设置TIM3时钟使能 9 10 11 TIM_TimeBaseStructure.TIM_Period = arr; //设置重装载寄存器的周期 12 TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置时钟频率除数的预分频值 13 TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割 14 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上的计数模式 15 TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //TIM3的初始化 16 17 TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //TIM3更新中断使能 18 19 20 NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3中断 21 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占优先0级 22 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //从占优先3级 23 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能 24 NVIC_Init(&NVIC_InitStructure); //初始化NVIC寄存器 25 26 27 TIM_Cmd(TIM3, ENABLE); //使能TIM3 28 } 29 //定时器3中断服务程序 30 void TIM3_IRQHandler(void) //TIM3中断 31 { 32 if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查TIM3更新中断发生与否 33 { 34 TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); //清除TIMx更新中断标志 35 LED2=!LED2; //取反 36 } 37 }
1 #include "stm32f10x_conf.h" 2 #include "led.h" 3 #include "key.h" 4 #include "delay.h" 5 #include "timer.h" 6 #include "usart.h" 7 8 int main(void) 9 { 10 11 delay_init(); 12 LED_Init(); 13 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); 14 uart_init(115200); 15 TIM3_Int_Init(4999,7199); 16 //((4999+1)*( 7199+1))/72=500000us=500ms 延时500ms 17 while(1) 18 { 19 LED3=!LED3; 20 delay_ms(1500); 21 /*当数值为2000时，延时时间变快。当数值为1500以下， 22 延时时间为x/1000，只设了几个值。其他值都还没有尝试。 23 */ 24 } 25 26 }