0 {5 q9 O' x# N- C% f8 T. p9 p# 工程创建参考：https://shequ.stmicroelectronics ... p;extra=#pid2657071
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! c2 |1 Q! \: _; O7 b# CubeMX配置工程
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# 修改代码
    static void MX_LPTIM3_Init(void)
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    /* USER CODE BEGIN LPTIM3_Init 0 */
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/ H8 {! L; L/ W0 t) M) a+ A1 P    /* USER CODE END LPTIM3_Init 0 */
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, n! J+ r! H( E    /* USER CODE BEGIN LPTIM3_Init 1 */
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    /* USER CODE END LPTIM3_Init 1 */
4 P/ `; b3 q- I2 Y% s! {# q    hlptim3.Instance = LPTIM3;
' p# |( ?! h9 |: o( a& F& }    hlptim3.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
    hlptim3.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV128;
1 p- E% n. N0 W! Y2 K/ c    hlptim3.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
! _# s' R6 B# [5 P6 n( ~1 s    hlptim3.Init.Period = 65535;
/ U( K: P; l: W& [; }6 u    hlptim3.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
3 c# \! m' D( u7 ], c    hlptim3.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
    hlptim3.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
    hlptim3.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
    hlptim3.Init.RepetitionCounter = 0;
    if (HAL_LPTIM_Init(&hlptim3) != HAL_OK)
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1 M5 C  Y( ^3 r8 n4 _- c        Error_Handler();
    }
) S6 |& M0 `& y% F& C    /* USER CODE BEGIN LPTIM3_Init 2 */
    HAL_LPTIM_Counter_Start_IT(&hlptim3);//添加启动低功耗定时器
. ~: j& Y7 ?" x; a* \    /* USER CODE END LPTIM3_Init 2 */
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6 e' X8 P6 R. W% ]! ^$ w/ o    while (1)
    {
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        /* -- Sample board code for User push-button in interrupt mode ---- */
        if (BspButtonState == BUTTON_PRESSED)
        {
# A; M6 n6 r* r" f# E        /* Update button state */
6 N2 S0 r* Z& @1 N* E; G        BspButtonState = BUTTON_RELEASED;
4 `3 V* _2 t! S6 _0 t: R$ P        /* -- Sample board code to toggle leds ---- */
, x0 ]+ t: k2 m, d$ I        BSP_LED_Toggle(LED_GREEN);
0 U, a) u- v9 \5 R        /* ..... Perform your action ..... */
        }
        HAL_SuspendTick();//添加进入休眠，以及串口打印命令
; {7 g- T# B* o9 _        printf("\r\n Enter sleep mode! \r\n");
        BSP_LED_Off(LED_GREEN);
        HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
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        /* USER CODE END WHILE */

# P  M: I6 }  X        /* USER CODE BEGIN 3 */
    }
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+ O( @" S, V8 t2 Q  Z    /* USER CODE BEGIN 0 */
    void HAL_LPTIM_UpdateEventCallback(LPTIM_HandleTypeDef *hlptim)
    {//添加回调函数、唤西醒并打印提示
, ^  a. c7 k- H, k0 }& B        HAL_ResumeTick();
        BSP_LED_On(LED_GREEN);
* T! z' L; e( D3 Q) h  }) y        printf("\r\n Exit sleep mode ! \r\n");
    }
, x+ j' X3 j4 U9 ?    /* USER CODE END 0 */
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: L7 h* w- Z2 |/ n' k6 Q# 下载运行，看效果
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