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

; R. I) i  ]6 u: v2 [! Y& u# CubeMX配置工程

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# 修改代码
2 _8 q$ p5 @) @6 F7 N6 l    static void MX_LPTIM3_Init(void)
    {
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    /* USER CODE BEGIN LPTIM3_Init 0 */
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    /* USER CODE END LPTIM3_Init 0 */

    /* USER CODE BEGIN LPTIM3_Init 1 */

    /* USER CODE END LPTIM3_Init 1 */
    hlptim3.Instance = LPTIM3;
: R: a4 z  T% s% f- `0 M. L. Y    hlptim3.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
    hlptim3.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV128;
    hlptim3.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
, U4 b* Q7 C: E$ v  g% q; G    hlptim3.Init.Period = 65535;
5 U. a9 j9 X" f) u8 g+ J4 l6 D    hlptim3.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
    hlptim3.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
6 d# ^% \% I7 y5 _: S    hlptim3.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
    hlptim3.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
    hlptim3.Init.RepetitionCounter = 0;
    if (HAL_LPTIM_Init(&hlptim3) != HAL_OK)
    {
        Error_Handler();
3 `% t! G7 i3 B4 c. v! e+ u    }
8 x: z& G& N3 O) J- j    /* USER CODE BEGIN LPTIM3_Init 2 */
    HAL_LPTIM_Counter_Start_IT(&hlptim3);//添加启动低功耗定时器
) a1 p; [! u- T: B- ~) f' K    /* USER CODE END LPTIM3_Init 2 */

* D7 u( j, n4 [; a+ ]+ `/ G    }
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4 K1 c: q7 e2 l# Z' z- m    while (1)
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0 {# ~' V$ H, {* @& ^: e& R        /* -- Sample board code for User push-button in interrupt mode ---- */
6 v% Q# G  u) f/ a3 A" d, I        if (BspButtonState == BUTTON_PRESSED)
6 z! }% r: A# L, B* u        {
        /* Update button state */
# K. o& u' \  D- N5 X! J$ C  `        BspButtonState = BUTTON_RELEASED;
        /* -- Sample board code to toggle leds ---- */
) N& r8 F# |1 C1 h# @7 I        BSP_LED_Toggle(LED_GREEN);
        /* ..... Perform your action ..... */
& {6 F- V" n8 s6 c5 E        }
        HAL_SuspendTick();//添加进入休眠，以及串口打印命令
        printf("\r\n Enter sleep mode! \r\n");
        BSP_LED_Off(LED_GREEN);
; o9 ]$ @/ h5 @$ X- p# N& T+ {7 C% M        HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
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        /* USER CODE END WHILE */

        /* USER CODE BEGIN 3 */
6 G2 i2 N$ ]! C9 p+ n! d, r( x    }

% q( q* z: }  T  G    /* USER CODE BEGIN 0 */
    void HAL_LPTIM_UpdateEventCallback(LPTIM_HandleTypeDef *hlptim)
6 d1 s* g) n8 i5 a8 [8 h) ]" r    {//添加回调函数、唤西醒并打印提示
        HAL_ResumeTick();
* y0 B$ |* ]/ N* ~8 Z( U  j        BSP_LED_On(LED_GREEN);
" ^1 z3 Q3 R. D/ O# f# w8 [% X        printf("\r\n Exit sleep mode ! \r\n");
    }
    /* USER CODE END 0 */
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