STM32时钟2不中断的分析和解决方法

sky-Hawk where

STM32时钟2不中断的分析
先是怀疑时钟使能问题，但是有

1. <STRONG>RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); </STRONG>

复制代码

将按键检查加入，下载后没反应

1. <STRONG>void TargetInit(void)
   
2. {
   
3.   RCC_Configuration();
   
4.   GPIO_Configuration();//加入这一句
   
5.   NVIC_Configuration();
   
6. 
   
7.   Timer_Configuration();
   
8.   OS_CPU_SysTickInit();
   
9. }
   
10. GPIO_Configuration();
    
11. {</STRONG>

复制代码

定时器中断部分

1. NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
   
2. NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
   
3. NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
   
4. NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   
5. NVIC_Init(&NVIC_InitStructure);}
   
6. 
   
7. TIM_TimeBaseStructure.TIM_Period = 200;
   
8. TIM_TimeBaseStructure.TIM_Prescaler = 360-1;
   
9. TIM_TimeBaseStructure.TIM_ClockDivision = 0;
   
10. TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    
11. TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
    
12. TIM_ClearFlag(TIM2,TIM_FLAG_Update);
    
13. TIM_ARRPreloadConfig(TIM2, ENABLE);
    
14. TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
    
15. TIM_Cmd(TIM2,ENABLE);
    
16. 
    
17. void TIM2_IRQHandler(void)
    
18. {
    
19. if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源
    
20. {
    
21. TIM_ClearITPendingBit(TIM2, TIM_IT_Update );
    
22. GPIO_WriteBit(led_gpio, led4 , (BitAction)!GPIO_ReadOutputDataBit(led_gpio, led4));
    
23. }
    
24. }
    

复制代码

修改后，指示灯常亮

再次修改，结果TIM2和TIM3都正常，将程序代码贴出：

中断配置

1. NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
   
2. NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
   
3. NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
   
4. NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   
5. NVIC_Init(&NVIC_InitStructure);
   
6. 
   

复制代码

  时钟配置：

1. void Timer_Configuration(void)
   
2. { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
   
3. 
   
4. //TIM_DeInit(TIM2);
   
5. RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);//启动TIM2时钟
   
6. 
   
7. TIM_TimeBaseStructure.TIM_Period = 5000;//200;
   
8. TIM_TimeBaseStructure.TIM_Prescaler = (7200-1);//360-1;
   
9. TIM_TimeBaseStructure.TIM_ClockDivision = 0;
   
10. TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    
11. TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
    
12. 
    
13. TIM_ITConfig( //使能或者失能指定的TIM中断
    
14. TIM2, //TIM2
    
15. TIM_IT_Update | //TIM 中断源
    
16. TIM_IT_Trigger, //TIM 触发中断源
    
17. ENABLE //使能);
    
18. }
    

复制代码

初始化流程：

1. void TargetInit(void)
   
2. {
   
3. //RCC_Configuration();
   
4. GPIO_Configuration();//加入
   
5. NVIC_Configuration();
   
6. Timer_Configuration();
   
7. //OS_CPU_SysTickInit();
   
8. }
   

复制代码

中断服务程序：

1. void TIM2_IRQHandler(void)
   
2. {
   
3. if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源
   
4. {
   
5. TIM_ClearITPendingBit(TIM2, TIM_IT_Update );
   
6. GPIO_WriteBit(led_gpio, led4 , (BitAction)!GPIO_ReadOutputDataBit(led_gpio, led4));
   
7. }
   
8. }
   

复制代码

注意：我发现网友将该代码写在MAIN中，那需将该程序写在MAIN函数之前，我把它提到MAIN之前

最后实验结果，时钟2中断使LED4不停闪烁，网友设置的值较快，看不到闪烁效果，我改了一下。

sky-Hawk where

板凳来了，支持啊！