# 工程创建参考：https://shequ.stmicroelectronics ... p;extra=#pid2657071
7 s: r2 L9 z3 E, q
0 ^# ~% Y6 n8 W6 E: a6 o3 _# CubeMX配置工程
6 C3 v* z" }- q; D; I* ^' A+ w
% ]4 k5 \* P: f 
2 z. {, s6 y7 @
. c8 o9 o6 D( a8 [# 修改代码
: g6 Q& b. d0 [, j9 A* d( L    static void MX_LPTIM3_Init(void)
    {

    /* USER CODE BEGIN LPTIM3_Init 0 */
' ]( F, \1 A' S+ f% d5 }. U% m
! G4 m* m3 ?; h+ n    /* USER CODE END LPTIM3_Init 0 */
2 A& b' i% D$ _* A7 Q8 C8 D. T# a
    /* USER CODE BEGIN LPTIM3_Init 1 */
( W/ S8 T, P; M  i/ s8 m
+ z4 Q+ ~4 L  u$ T8 i    /* USER CODE END LPTIM3_Init 1 */
' F6 M5 q' z: ^7 _5 o    hlptim3.Instance = LPTIM3;
+ s  y" l% l6 D6 U2 b- x9 J8 h    hlptim3.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
7 H3 Y0 T5 V/ g( k  O/ O5 S    hlptim3.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV128;
    hlptim3.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
* [) T$ s1 E( k0 t1 i, b    hlptim3.Init.Period = 65535;
# x6 b7 H; g% g4 j: y    hlptim3.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
( p. T( G2 m2 r. _3 E    hlptim3.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
    hlptim3.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
    hlptim3.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
. J: R  u" f. w: Q5 Y* z    hlptim3.Init.RepetitionCounter = 0;
* {& X& q1 s5 E0 l8 c& y# n    if (HAL_LPTIM_Init(&hlptim3) != HAL_OK)
1 p  V' D& L' [/ Z* t. A& F# U    {
9 n; O2 a" A+ Y$ Q7 [' X        Error_Handler();
; E' ^0 V5 q! Y" `0 ?( s4 |    }
. x4 R3 p+ H0 L1 \3 |; @3 J    /* USER CODE BEGIN LPTIM3_Init 2 */
/ t5 S! b7 Q8 c9 r- @# ?! z+ B    HAL_LPTIM_Counter_Start_IT(&hlptim3);//添加启动低功耗定时器
+ w' i; u: z- K. c. [    /* USER CODE END LPTIM3_Init 2 */

    }

6 G3 U7 y5 _' M: E+ W% o
    while (1)
- S# V: G! y0 {6 I    {
8 W" \+ _. N: D: v% I9 G
        /* -- Sample board code for User push-button in interrupt mode ---- */
        if (BspButtonState == BUTTON_PRESSED)
8 W, I$ p/ p+ e6 {. [        {
$ d  R; j7 T3 P+ E# P* ^% Z        /* Update button state */
        BspButtonState = BUTTON_RELEASED;
        /* -- Sample board code to toggle leds ---- */
: I% w+ l( J9 _! s9 _# Z0 ]        BSP_LED_Toggle(LED_GREEN);
        /* ..... Perform your action ..... */
        }
        HAL_SuspendTick();//添加进入休眠，以及串口打印命令
3 d4 c( y; p% x* R) x: D        printf("\r\n Enter sleep mode! \r\n");
        BSP_LED_Off(LED_GREEN);
        HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);

        /* USER CODE END WHILE */

/ i: D* e' @4 l5 M: v. r. ?7 G0 }        /* USER CODE BEGIN 3 */
: c; @/ j1 I- l" e- ~9 X    }

    /* USER CODE BEGIN 0 */
* [; Q% q, ?* j, l    void HAL_LPTIM_UpdateEventCallback(LPTIM_HandleTypeDef *hlptim)
    {//添加回调函数、唤西醒并打印提示
, I  x5 n. k: X; V# z, i        HAL_ResumeTick();
* T- }+ G9 R- w" I/ ^/ ?% U* V8 y        BSP_LED_On(LED_GREEN);
        printf("\r\n Exit sleep mode ! \r\n");
    }
    /* USER CODE END 0 */
/ R/ n9 ]5 T. j( n( D/ T+ ^
) Y, e8 E: j/ n  g
# 下载运行，看效果
! \& V1 x2 V; }0 r6 H$ y1 O; M6 u 
; ~0 h/ N2 ~% L4 j# W. U* @
( [7 J* q3 E  q/ p3 P7 T% z4 z4 v
0 e1 ^2 D" |. ^7 J8 H