本帖最后由 zhcj66 于 2019-12-4 08:26 编辑

如题<STM32L051定时器,修改定时参数,不起作用,什么原因?>  输出频率固定在551KHz  

无论怎么修改
  TimHandle.Init.Period = 5000 - 1;
  TimHandle.Init.Prescaler = (uint32_t) ((SystemCoreClock / 10000) - 1);/* Compute the prescaler value to have TIMx counter clock equal to 10 KHz */
参数都无法更改定时频率,

1.                        
   
2. #define TIMx_CLK_ENABLE              __HAL_RCC_TIM6_CLK_ENABLE
   
3. 
   
4. /* Definition for TIMx's NVIC */
   
5. #define TIMx_IRQn                    TIM6_DAC_IRQn
   
6. #define TIMx_IRQHandler              TIM6_DAC_IRQHandler
   
7. TIM_HandleTypeDef    TimHandle;
   
8. static void ErrorHandler(void)
   
9. {
   
10.   /* Infinite loop */
    
11.   while(1)
    
12.   {
    
13.   }
    
14. }
    
15. /* Prescaler declaration */
    
16. uint32_t uwPrescalerValue = 0;
    
17. void TIM6_Init(void)//0.5s-2Hz
    
18. {
    
19.   /*##-1- Configure the TIM peripheral #######################################*/
    
20.   /* Set TIMx instance */
    
21.   TimHandle.Instance = TIM6;
    
22.    
    
23.   /* Initialize TIMx peripheral as follow:
    
24.        + Period = 10000 - 1
    
25.        + Prescaler = SystemCoreClock/10000 Note that APB clock = TIMx clock if
    
26.                      APB prescaler = 1.
    
27.        + ClockDivision = 0
    
28.        + Counter direction = Up
    
29.   */
    
30.   TimHandle.Init.Period = 5000 - 1;
    
31.   TimHandle.Init.Prescaler = (uint32_t) ((SystemCoreClock / 10000) - 1);/* Compute the prescaler value to have TIMx counter clock equal to 10 KHz */
    
32.   TimHandle.Init.ClockDivision = 0;
    
33.   TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
    
34.   if(HAL_TIM_Base_Init(&TimHandle) != HAL_OK)
    
35.   {
    
36.     /* Initialization Error */
    
37.     ErrorHandler();
    
38.   }
    
39.   
    
40.   /*##-2- Start the TIM Base generation in interrupt mode ####################*/
    
41.   /* Start Channel1 */
    
42.   if(HAL_TIM_Base_Start_IT(&TimHandle) != HAL_OK)
    
43.   {
    
44.     /* Starting Error */
    
45.     ErrorHandler();
    
46.   }
    
47. }
    
48. 
    
49. 
    
50. #define TIMx_CLK_ENABLE              __HAL_RCC_TIM6_CLK_ENABLE
    
51. void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)
    
52. {
    
53.   /*##-1- Enable peripherals and GPIO Clocks #################################*/
    
54.   /* TIMx Peripheral clock enable */
    
55.   TIMx_CLK_ENABLE();
    
56.   
    
57.   /* The used GPIO (LED2 port) will be configured in the main program through
    
58.   LED2 initialization method */
    
59. 
    
60.   /*##-2- Configure the NVIC for TIMx ########################################*/
    
61.   /* Set the TIMx priority */
    
62.   HAL_NVIC_SetPriority(TIMx_IRQn, 0, 0);
    
63.   
    
64.   /* Enable the TIMx global Interrupt */
    
65.   HAL_NVIC_EnableIRQ(TIMx_IRQn);
    
66. }
    
67. 
    
68. void TIMx_IRQHandler(void)
    
69. {
    
70.         HAL_GPIO_TogglePin(GPIOH, GPIO_PIN_1);
    
71. }

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