# 工程创建参考：https://shequ.stmicroelectronics ... p;extra=#pid2657071

# CubeMX配置工程
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3 I. U, K/ o# e. O  ~  j( z0 a3 J# 修改代码
    static void MX_LPTIM3_Init(void)
    {

    /* USER CODE BEGIN LPTIM3_Init 0 */
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    /* USER CODE END LPTIM3_Init 0 */
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( i/ Q' ]2 X: \    /* USER CODE BEGIN LPTIM3_Init 1 */
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    /* USER CODE END LPTIM3_Init 1 */
1 Y. B* \7 g1 K' z4 X0 l* H    hlptim3.Instance = LPTIM3;
3 E: D' g) w7 t1 E3 e2 v    hlptim3.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
6 G+ |4 Y) W3 P0 y0 G) E1 F7 O    hlptim3.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV128;
& w% Q2 m/ N1 o& Q* v1 E" A+ y' Y! J    hlptim3.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
( j; C8 t: T+ f$ `    hlptim3.Init.Period = 65535;
3 n& p8 h9 K0 B7 I  g    hlptim3.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
. H4 z. ]" T8 V4 o& k    hlptim3.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
    hlptim3.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
    hlptim3.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
, D3 {8 I. I: _* B+ U6 ]    hlptim3.Init.RepetitionCounter = 0;
4 Y" ]# Y; D6 t$ x( K. [* O    if (HAL_LPTIM_Init(&hlptim3) != HAL_OK)
( C. I  \3 H3 ~5 S. R    {
% ?: v0 q9 f* r        Error_Handler();
9 w$ f# {  ?. p+ @1 J    }
    /* USER CODE BEGIN LPTIM3_Init 2 */
2 Q5 A0 O3 Q% {2 {: f, X. e    HAL_LPTIM_Counter_Start_IT(&hlptim3);//添加启动低功耗定时器
1 [0 j! r8 V2 R- x4 U; Z    /* USER CODE END LPTIM3_Init 2 */
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    }


    while (1)
    {

2 W8 U- O) y; F0 S/ U2 S        /* -- Sample board code for User push-button in interrupt mode ---- */
7 x2 ~8 }7 X& a/ V5 G8 t: ~        if (BspButtonState == BUTTON_PRESSED)
- m( I6 I$ ]& Q' n2 v! w! ]        {
        /* Update button state */
1 Y- D: F0 W# {) h( v" ~0 J        BspButtonState = BUTTON_RELEASED;
% e: k' j8 f, _2 @        /* -- Sample board code to toggle leds ---- */
        BSP_LED_Toggle(LED_GREEN);
        /* ..... Perform your action ..... */
        }
% b$ z/ Q8 j1 W. j0 d! Y        HAL_SuspendTick();//添加进入休眠，以及串口打印命令
        printf("\r\n Enter sleep mode! \r\n");
) ~' o/ s1 n* |0 X& H1 i- ^' W+ c9 K        BSP_LED_Off(LED_GREEN);
. V" U6 K- l6 G( N% l        HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);

- O+ S' w* p/ g# B& l5 S4 l! g        /* USER CODE END WHILE */

3 p* K6 X" i& B. O' ?; S# Y5 x        /* USER CODE BEGIN 3 */
    }

    /* USER CODE BEGIN 0 */
    void HAL_LPTIM_UpdateEventCallback(LPTIM_HandleTypeDef *hlptim)
$ U4 [6 N# W3 ^    {//添加回调函数、唤西醒并打印提示
        HAL_ResumeTick();
        BSP_LED_On(LED_GREEN);
        printf("\r\n Exit sleep mode ! \r\n");
    }
. |  S; ]: z( Y: ?: ~& L    /* USER CODE END 0 */


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