1 E/ A  H. J1 R- h. |; `# 工程创建参考：https://shequ.stmicroelectronics ... p;extra=#pid2657071

2 Y6 _+ D" m- [/ i0 W! C0 L# CubeMX配置工程
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# 修改代码
. H0 J( Y& {0 L# B1 U    static void MX_LPTIM3_Init(void)
    {

& R1 j3 ]' t6 t! C" |- N" O$ _    /* USER CODE BEGIN LPTIM3_Init 0 */
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    /* USER CODE END LPTIM3_Init 0 */

; z0 q# n2 o# Y+ Y. p8 B    /* USER CODE BEGIN LPTIM3_Init 1 */

" T8 B8 @( s$ T$ x- V    /* USER CODE END LPTIM3_Init 1 */
    hlptim3.Instance = LPTIM3;
& ^% s% N, |7 ?4 k4 L  C1 [/ m    hlptim3.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
* O. W) g& N  V+ D: T) ?4 }0 h* m    hlptim3.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV128;
    hlptim3.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
    hlptim3.Init.Period = 65535;
4 g6 K9 e/ z% F2 p    hlptim3.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
    hlptim3.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
    hlptim3.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
( L7 D( X0 x- g( b- P    hlptim3.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
! e" z7 B: k5 a  D    hlptim3.Init.RepetitionCounter = 0;
    if (HAL_LPTIM_Init(&hlptim3) != HAL_OK)
: G% v0 v; ]& P2 q/ M    {
2 S8 T$ p! X* m8 j$ Z        Error_Handler();
    }
    /* USER CODE BEGIN LPTIM3_Init 2 */
    HAL_LPTIM_Counter_Start_IT(&hlptim3);//添加启动低功耗定时器
6 t5 G' p9 r" I    /* USER CODE END LPTIM3_Init 2 */

    }
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    while (1)
    {

        /* -- Sample board code for User push-button in interrupt mode ---- */
5 T& s9 m8 |$ d4 e4 A) Z7 @        if (BspButtonState == BUTTON_PRESSED)
$ r! M) G3 K+ A( c" g        {
% x; O/ A; D) H3 Z: Q: S        /* Update button state */
4 `' A9 k% h' `) k( i        BspButtonState = BUTTON_RELEASED;
        /* -- Sample board code to toggle leds ---- */
        BSP_LED_Toggle(LED_GREEN);
! ^% @/ m! T  h  `        /* ..... Perform your action ..... */
0 b/ y1 J9 y) ~4 [, `        }
$ m- O! H( E4 o+ Q1 X3 B1 ]        HAL_SuspendTick();//添加进入休眠，以及串口打印命令
        printf("\r\n Enter sleep mode! \r\n");
" P( P/ _) c+ r& e0 _8 U; }6 J  e        BSP_LED_Off(LED_GREEN);
- E; a3 F6 a/ ]; L, Q- _( b1 ]8 o1 c        HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);

% Q2 r0 V) ~% f9 V# Y- l        /* USER CODE END WHILE */
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# b# Y& U, g1 s8 g# ]- ~        /* USER CODE BEGIN 3 */
2 p/ M9 X) h1 m. E6 r    }
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" n% H) v" E9 m+ ?, e% S: V    /* USER CODE BEGIN 0 */
6 }! E6 K9 m5 t: `% b    void HAL_LPTIM_UpdateEventCallback(LPTIM_HandleTypeDef *hlptim)
0 E! q* p9 K6 O; a    {//添加回调函数、唤西醒并打印提示
  n6 [1 \; i. H( p8 x* F        HAL_ResumeTick();
& f7 Z& v1 }; v; P+ \9 t        BSP_LED_On(LED_GREEN);
        printf("\r\n Exit sleep mode ! \r\n");
' }7 ?6 H: y5 S7 R5 a, y1 v9 W$ x    }
9 H+ t; d& X' v( ~    /* USER CODE END 0 */

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