赏析之 M3定时器 TIM3计数中断led闪烁 (13)

yuweixian4230

工程代码： 6_tim3计数中断led闪烁.rar  

1. #ifndef __TIM3_H
   
2. #define __TIM3_H
   
3. 
   
4. #include "stm32f10x_nvic.h"
   
5. #include "stm32f10x_tim.h"
   
6. 
   
7. void TIM3_Configuration(void); //初始化 TIM3
   
8. void TIM3_NVIC_Configuration(void); //中断优先级配置
   
9. 
   
10. #endif

1. #include "tim3.h"
   
2. /*
   
3. * rcc时钟配置： SYSCLK = 16MHZ
   
4. * AHB = 16MHZ
   
5. *              APB1 = 8 MHZ // TIM2 TIM3 TIM4
   
6. *                 APB2 = 16 MHZ //GPIO A B C D
   
7. */
   
8. void TIM3_Configuration(void)
   
9. {
   
10.     TIM_TimeBaseInitTypeDef      TIM_TimeBaseStructure;
    
11.     
    
12.     TIM_TimeBaseStructure.TIM_Prescaler = 1; //APB1时钟 2预分频 8MHZ/2 = 4MHZ
    
13.                                             //1秒时间 4MHZ 的脉冲
    
14.     TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    
15.     TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //计数模式
    
16.     TIM_TimeBaseStructure.TIM_Period = 4000; //自动装载 从1~4000计数，刚好1ms时间
    
17.     TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
    
18.     
    
19.     TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
    
20.     TIM_Cmd(TIM3, ENABLE);
    
21.     //需要使能TIM3时钟，我们已经在RCC头文件中 使能了
    
22.     //RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);    //定时器3提供时钟
    
23. }
    
24. 
    
25. 
    
26. /**********************************************************************
    
27. * 名 称:NVIC_Configuration()
    
28. * 功 能:中断优先级设置
    
29. * 入口参数：
    
30. * 出口参数：
    
31. -----------------------------------------------------------------------
    
32. * 说明：设置Tim3优先级
    
33. ***********************************************************************/
    
34. void TIM3_NVIC_Configuration(void)
    
35. {
    
36.     NVIC_InitTypeDef NVIC_InitStructure;
    
37.     
    
38. #ifdef VECT_TAB_RAM
    
39.     /* Set the Vector Table base location at 0x20000000 */
    
40.     NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
    
41. #else /* VECT_TAB_FLASH */
    
42.     /* Set the Vector Table base location at 0x08000000 */
    
43.     NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
    
44. #endif
    
45. 
    
46.     NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//抢占式优先级别, 无抢占优先级
    
47.     
    
48.     /* Enable the TIM3 Interrupt 使能TIM3中断*/
    
49.     NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQChannel;
    
50.     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    
51.     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    
52.     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    
53.     NVIC_Init(&NVIC_InitStructure);
    
54.  
    
55. }