# 工程创建参考：https://shequ.stmicroelectronics ... p;extra=#pid2657071
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- o" M5 t0 o2 n4 H& }1 z# CubeMX配置工程
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7 Z% U5 z( X  o: l# 修改代码
    static void MX_LPTIM3_Init(void)
    {
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    /* USER CODE BEGIN LPTIM3_Init 0 */

; Q# O, K7 P" j$ h& [% a    /* USER CODE END LPTIM3_Init 0 */

    /* USER CODE BEGIN LPTIM3_Init 1 */

  \2 B! |4 C! Y& c1 H    /* USER CODE END LPTIM3_Init 1 */
    hlptim3.Instance = LPTIM3;
" I5 M# x+ z! Z7 }4 t    hlptim3.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
+ o, P" S% I- L0 L1 i" s8 p    hlptim3.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV128;
    hlptim3.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
    hlptim3.Init.Period = 65535;
    hlptim3.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
    hlptim3.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
    hlptim3.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
7 i; f8 P& V1 z    hlptim3.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
, m- o% x4 ^7 B/ F( a/ g) c& n1 A' X8 C    hlptim3.Init.RepetitionCounter = 0;
+ g, d* w6 Z/ ?& n( E9 @    if (HAL_LPTIM_Init(&hlptim3) != HAL_OK)
    {
8 p+ o. m5 i+ A1 s9 }        Error_Handler();
    }
% B+ L. a( H! H: A. E! K    /* USER CODE BEGIN LPTIM3_Init 2 */
    HAL_LPTIM_Counter_Start_IT(&hlptim3);//添加启动低功耗定时器
    /* USER CODE END LPTIM3_Init 2 */
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    while (1)
    {

( S; p) [8 ^9 @        /* -- Sample board code for User push-button in interrupt mode ---- */
6 L/ j% {; z+ S" W  r0 y; {        if (BspButtonState == BUTTON_PRESSED)
        {
6 I! x, o4 X3 t+ ?0 A$ o3 c        /* Update button state */
        BspButtonState = BUTTON_RELEASED;
2 l# o5 A5 n; `3 i        /* -- Sample board code to toggle leds ---- */
        BSP_LED_Toggle(LED_GREEN);
        /* ..... Perform your action ..... */
        }
        HAL_SuspendTick();//添加进入休眠，以及串口打印命令
        printf("\r\n Enter sleep mode! \r\n");
        BSP_LED_Off(LED_GREEN);
1 n9 l( Y4 ]5 W# E; l/ S0 v        HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
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        /* USER CODE END WHILE */
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  w: c( Q; \- s7 j+ v  j        /* USER CODE BEGIN 3 */
% n) ?. ^* [0 t7 G# A( }    }

    /* USER CODE BEGIN 0 */
; G4 \9 Y7 i3 ]4 j$ k    void HAL_LPTIM_UpdateEventCallback(LPTIM_HandleTypeDef *hlptim)
/ R2 f- G" S  W8 E  @    {//添加回调函数、唤西醒并打印提示
% {, u8 J5 q3 F# T8 M$ B        HAL_ResumeTick();
        BSP_LED_On(LED_GREEN);
5 P& C1 u2 B2 [2 }/ U        printf("\r\n Exit sleep mode ! \r\n");
! k7 U- Z7 h7 Y& a$ L" L7 m    }
/ r- g- N& ~1 E. ~6 ?* o    /* USER CODE END 0 */


2 G9 \, Y; p3 h6 Z) a& C# 下载运行，看效果
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