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

, R" G; c4 U& j- k8 f# CubeMX配置工程
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( f: R8 }# q* O' ?# 修改代码
    static void MX_LPTIM3_Init(void)
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    /* USER CODE BEGIN LPTIM3_Init 0 */
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) b. k; Q5 [1 _0 \    /* USER CODE END LPTIM3_Init 0 */
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$ n8 l% o0 z/ b3 m# T    /* USER CODE BEGIN LPTIM3_Init 1 */
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' I$ k) \7 t! x9 A; \0 |    /* USER CODE END LPTIM3_Init 1 */
0 w! K7 z" w8 O. r" Y    hlptim3.Instance = LPTIM3;
    hlptim3.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
    hlptim3.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV128;
    hlptim3.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
    hlptim3.Init.Period = 65535;
. ]% h% k0 }' O- T) @    hlptim3.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
    hlptim3.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
    hlptim3.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
0 A8 t$ F2 ], z$ S2 O    hlptim3.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
, n' \" V: R6 K6 x. W    hlptim3.Init.RepetitionCounter = 0;
    if (HAL_LPTIM_Init(&hlptim3) != HAL_OK)
    {
        Error_Handler();
    }
' l5 |& j" m; ?) C6 d8 m  n    /* USER CODE BEGIN LPTIM3_Init 2 */
# P) ]# j- A2 f' v    HAL_LPTIM_Counter_Start_IT(&hlptim3);//添加启动低功耗定时器
  a: m' F+ `; j3 U( [    /* USER CODE END LPTIM3_Init 2 */

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    while (1)
    {
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        /* -- Sample board code for User push-button in interrupt mode ---- */
+ z- V, c8 v+ v8 I  c) C2 N6 t        if (BspButtonState == BUTTON_PRESSED)
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        /* Update button state */
5 C; A" c8 m0 S! \0 l. g+ _        BspButtonState = BUTTON_RELEASED;
( O0 p, I5 e/ }# A5 Q, X) Z        /* -- Sample board code to toggle leds ---- */
        BSP_LED_Toggle(LED_GREEN);
" m2 g- \, r0 B2 ~        /* ..... Perform your action ..... */
  ?: X. D: _- b  p2 b/ ]        }
2 q; @) i  S& U1 g        HAL_SuspendTick();//添加进入休眠，以及串口打印命令
        printf("\r\n Enter sleep mode! \r\n");
, X: N0 J. a' c/ N: h3 u        BSP_LED_Off(LED_GREEN);
; n/ w# ^! ?) x, K3 {% X0 J! ?. Y        HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
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        /* USER CODE END WHILE */
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) t* Y1 c9 _) |4 H$ p% `        /* USER CODE BEGIN 3 */
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    /* USER CODE BEGIN 0 */
9 l. ^1 ~8 p  l: q* y    void HAL_LPTIM_UpdateEventCallback(LPTIM_HandleTypeDef *hlptim)
    {//添加回调函数、唤西醒并打印提示
        HAL_ResumeTick();
& Z3 D: ^* c6 @) V3 V5 T& }        BSP_LED_On(LED_GREEN);
4 ?0 w! p. V- ?2 j1 n4 m        printf("\r\n Exit sleep mode ! \r\n");
    }
    /* USER CODE END 0 */

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