# 工程创建参考：https://shequ.stmicroelectronics ... p;extra=#pid2657071
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* y7 B6 K% _* A3 o" p8 `0 t" N# CubeMX配置工程


7 G8 r$ j3 L8 T& m/ z- s# 修改代码
    static void MX_LPTIM3_Init(void)
    {

    /* USER CODE BEGIN LPTIM3_Init 0 */
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8 X* \) W) V) u* E0 H) K: u& z    /* USER CODE END LPTIM3_Init 0 */

0 a2 b8 x- j  d$ C/ f1 I    /* USER CODE BEGIN LPTIM3_Init 1 */
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: o& e! v4 H. s/ C2 D4 ^% Z    /* USER CODE END LPTIM3_Init 1 */
    hlptim3.Instance = LPTIM3;
    hlptim3.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
    hlptim3.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV128;
/ P( Z6 G' S- a+ B: b* e7 v    hlptim3.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
) I$ e% Z( X- Z6 m2 K. J    hlptim3.Init.Period = 65535;
    hlptim3.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
8 `, T9 q$ [. e$ K/ U    hlptim3.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
    hlptim3.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
2 j8 B% F0 s" M  r    hlptim3.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
3 i* L/ s" X# J1 t/ x2 L( s    hlptim3.Init.RepetitionCounter = 0;
& ^$ P  F* ?/ q( R    if (HAL_LPTIM_Init(&hlptim3) != HAL_OK)
) g) w' s- D& d& ^    {
' ]2 \2 n7 z1 J0 {) N& c) l) S- C0 u( [        Error_Handler();
2 ~4 M$ C" t1 W& W* {+ @    }
! R8 C% `9 ~, v8 J$ V$ W" e    /* USER CODE BEGIN LPTIM3_Init 2 */
& C; j" u& g: d+ g2 N$ [    HAL_LPTIM_Counter_Start_IT(&hlptim3);//添加启动低功耗定时器
    /* USER CODE END LPTIM3_Init 2 */

3 x/ g' @! R; q6 {+ S4 I; V% D. D# o    }
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    while (1)
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        /* -- Sample board code for User push-button in interrupt mode ---- */
! {0 O+ o; z( G1 z% `( i6 C- C) [        if (BspButtonState == BUTTON_PRESSED)
# D5 s5 K. T0 q# g        {
: U+ ^, U% W3 h& g* p+ n# u        /* Update button state */
& y) {. V3 j$ T        BspButtonState = BUTTON_RELEASED;
        /* -- Sample board code to toggle leds ---- */
        BSP_LED_Toggle(LED_GREEN);
  e# k$ t) x* n2 }. s) K9 p        /* ..... Perform your action ..... */
        }
        HAL_SuspendTick();//添加进入休眠，以及串口打印命令
+ G6 q% D: P$ c% x1 @7 x/ z        printf("\r\n Enter sleep mode! \r\n");
/ G' T, P4 p9 D/ {9 D/ c        BSP_LED_Off(LED_GREEN);
! z" B! K# |7 ?        HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
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        /* USER CODE END WHILE */

% Z+ s0 i4 n7 a        /* USER CODE BEGIN 3 */
    }

    /* USER CODE BEGIN 0 */
    void HAL_LPTIM_UpdateEventCallback(LPTIM_HandleTypeDef *hlptim)
! y+ b6 D# L, W! C( S0 {    {//添加回调函数、唤西醒并打印提示
        HAL_ResumeTick();
2 p8 ~7 U& V- S# n        BSP_LED_On(LED_GREEN);
( Z# l6 ^. S! c9 W4 `/ V# b  U# F        printf("\r\n Exit sleep mode ! \r\n");
% ], o- i' Y! a; I) B0 F    }
    /* USER CODE END 0 */
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1 g, f- r. a) j3 V+ E& q2 U% [/ I5 e# 下载运行，看效果
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