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 }
