2 D1 M  h, _) N& Z3 Z) ^# 工程创建参考：https://shequ.stmicroelectronics ... p;extra=#pid2657071
9 T* p2 V4 l  C6 @' j1 o9 c
9 d6 i- ^  F# P1 ]. C' t( G# CubeMX配置工程

  t+ q7 L* Z  X; b, r$ M
: f" b$ {7 D6 _( p: ~' m# 修改代码
    static void MX_LPTIM3_Init(void)
    {

    /* USER CODE BEGIN LPTIM3_Init 0 */
; N: d. H; C3 d! F" z4 ^
    /* USER CODE END LPTIM3_Init 0 */
* [0 s2 U* b8 I; A  E+ V- w
    /* USER CODE BEGIN LPTIM3_Init 1 */

& o) s* M8 h+ Y$ w. h    /* USER CODE END LPTIM3_Init 1 */
    hlptim3.Instance = LPTIM3;
! w+ l; X) _, `1 q9 U3 \0 {% k    hlptim3.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
- E% ]' z& O' D7 s0 R: d( b    hlptim3.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV128;
: C" K: i) B5 h# s0 c    hlptim3.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
4 ]& G1 o) {& h4 W- y6 j    hlptim3.Init.Period = 65535;
  M* \5 ]1 Q) x* l* u9 x1 }2 R    hlptim3.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
    hlptim3.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
2 |1 _& R2 r& E2 X- ^    hlptim3.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
    hlptim3.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
9 n& g: p/ P( b- ?) c, A; _    hlptim3.Init.RepetitionCounter = 0;
    if (HAL_LPTIM_Init(&hlptim3) != HAL_OK)
$ c2 M$ B) u' o8 A* R/ D    {
/ C, o( M0 G, \- g        Error_Handler();
; C9 t7 w* [! }* ~. @+ p/ `    }
: C# S0 j* g7 Y8 I  w0 |    /* USER CODE BEGIN LPTIM3_Init 2 */
    HAL_LPTIM_Counter_Start_IT(&hlptim3);//添加启动低功耗定时器
: d% V- Z( M# ]: {    /* USER CODE END LPTIM3_Init 2 */

3 P: }$ ^5 y: z; u0 |    }
! l8 d" ~& d: C2 h) H

# L1 [1 k9 u8 h  L0 S2 x: U    while (1)
7 ~- _. s# x$ Y2 ?6 P    {
/ N* d+ w$ F/ l9 v& L0 Q. ?
& Q9 H. {2 J' I        /* -- Sample board code for User push-button in interrupt mode ---- */
        if (BspButtonState == BUTTON_PRESSED)
) a) S5 L* n" p  O        {
& k; ]. |7 M% j6 q        /* Update button state */
" j$ s: [- Q) }6 _        BspButtonState = BUTTON_RELEASED;
' r$ _: l4 K# m9 }  a# y, R        /* -- Sample board code to toggle leds ---- */
3 N( s! |% d, K        BSP_LED_Toggle(LED_GREEN);
        /* ..... Perform your action ..... */
        }
        HAL_SuspendTick();//添加进入休眠，以及串口打印命令
; c. k2 ]7 V: i" N8 d( A& @        printf("\r\n Enter sleep mode! \r\n");
- v6 q6 ]) e2 N        BSP_LED_Off(LED_GREEN);
9 x& l5 v- l  G! M# z" a. u$ G! v        HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);

4 T1 c5 D- Z7 V! d+ }/ L8 A# L" e4 d1 O        /* USER CODE END WHILE */
' T. e" B3 @; C* k
, \. s! {7 ~3 `1 P" S$ R  d3 a        /* USER CODE BEGIN 3 */
+ @, r. ]' g' U+ s* k1 U    }

    /* 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
        HAL_ResumeTick();
' L; R" B6 e( T$ }        BSP_LED_On(LED_GREEN);
        printf("\r\n Exit sleep mode ! \r\n");
    }
7 ?3 ]; i8 b7 p: C$ F# `7 h    /* USER CODE END 0 */


# 下载运行，看效果
6 b. c+ e  R1 G, x# u7 ?# F
# E8 t% L( f6 W  A$ W" m) W, o
' [! H# A1 x' T3 `