STM32L4窗口看门狗的使用还是点灯

xutong

STM32L4窗口看门狗的使用还是点灯 [复制链接]

1. #include "stm32l4xx_hal.h"
   
2. #include "periph.h"
   
3. static WWDG_HandleTypeDef  wwdgHandle;
   
4. int main()
   
5. {
   
6.         HAL_Init();
   
7.         SystemClock_Config();
   
8.         __HAL_RCC_WWDG_CLK_ENABLE();
   
9.         Gpio_Inits();
   
10.                
    
11.          HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_SET);
    
12.         HAL_Delay(300);
    
13.         /*
    
14.                 设置分频系数8
    
15.           WWDG counter clock = (PCLK1/4096)/8
    
16.                 设置窗口值 最大0x7f 到窗口0x50
    
17.                 唤醒中断关闭
    
18. */
    
19.   wwdgHandle.Instance =WWDG; //窗口看门狗
    
20.   wwdgHandle.Init.Prescaler = WWDG_PRESCALER_8;  //设置8分频
    
21.   wwdgHandle.Init.Window = 0X50;
    
22.         wwdgHandle.Init.Counter=0x7f;
    
23.         wwdgHandle.Init.EWIMode=WWDG_EWI_DISABLE;  //唤醒中断
    
24.         HAL_WWDG_Init(&wwdgHandle);
    
25.         while(1)
    
26.         {
    
27.           HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET);
    
28. 
    
29.         }
    
30. }
    

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xutong

1. #include "stm32l4xx_hal.h"
   
2. #include "periph.h"
   
3. static WWDG_HandleTypeDef  wwdgHandle;
   
4. static uint32_t TimeoutCalculation(uint32_t timevalue);
   
5. int main()
   
6. {
   
7.         uint32_t delay;
   
8.         HAL_Init();
   
9.         SystemClock_Config();
   
10.         __HAL_RCC_WWDG_CLK_ENABLE();  //使能wwdg时钟
    
11.         Gpio_Inits();
    
12.                
    
13.          HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET);
    
14.         HAL_Delay(1300);
    
15.         /*
    
16.                 设置分频系数8
    
17.           WWDG counter clock = (PCLK1/4096)/8
    
18.                 设置窗口值 最大0x7f 到窗口0x50
    
19.                 唤醒中断关闭
    
20. */
    
21. 
    
22.   wwdgHandle.Instance =WWDG; //窗口看门狗
    
23.   wwdgHandle.Init.Prescaler = WWDG_PRESCALER_8;  //设置8分频
    
24.   wwdgHandle.Init.Window = 0X50;
    
25.         wwdgHandle.Init.Counter=0x7f;
    
26.         wwdgHandle.Init.EWIMode=WWDG_EWI_DISABLE;  //唤醒中断
    
27.         HAL_WWDG_Init(&wwdgHandle);
    
28.           delay = TimeoutCalculation((wwdgHandle.Init.Counter-wwdgHandle.Init.Window) + 1) + 1;
    
29.         while(1)
    
30.         {
    
31.          HAL_GPIO_TogglePin(GPIOA,GPIO_PIN_5);
    
32.          HAL_Delay(delay);                 //延时到窗口时间
    
33.                 HAL_WWDG_Refresh(&wwdgHandle);  //喂狗
    
34. 
    
35.         }
    
36. }
    
37. static uint32_t TimeoutCalculation(uint32_t timevalue)
    
38. {
    
39.   uint32_t timeoutvalue = 0;
    
40.   uint32_t pclk1 = 0;
    
41.   uint32_t wdgtb = 0;
    
42. 
    
43.   /* considering APB divider is still 1, use HCLK value */
    
44.   pclk1 = HAL_RCC_GetPCLK1Freq();
    
45. 
    
46.   /* get prescaler */
    
47.   wdgtb = (1 << ((wwdgHandle.Init.Prescaler) >> 7)); /* 2^WDGTB[1:0] */
    
48.        
    
49. 
    
50.   /* calculate timeout */
    
51.   timeoutvalue = ((4096 * wdgtb * timevalue) / (pclk1 / 1000));
    
52. 
    
53.   return timeoutvalue;
    
54. }
    

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xutong

1. void EXTI15_10_IRQHandler(void)
   
2. {
   
3.   /* As the following address is invalid (not mapped), a Hardfault exception
   
4.   will be generated with an infinite loop and when the WWDG counter falls to 63
   
5.   the WWDG reset occurs */
   
6.   *(__IO uint32_t *) 0xA0003000 = 0xFF;
   
7. }

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中断函数
因为下面的地址是无效的(没有映射)，一个硬错误异常
将生成一个无限循环，当WWDG计数器降为63时
WWDG/复位发生/