. q) a+ {+ q, y# 工程创建参考：https://shequ.stmicroelectronics ... p;extra=#pid2657071
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) p) f! S. A* K( v# CubeMX配置工程

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) h, M  t" F7 F/ N0 x8 A# 修改代码
    static void MX_LPTIM3_Init(void)
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    /* USER CODE BEGIN LPTIM3_Init 0 */
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1 u3 |! `; l7 Q/ S4 Y    /* USER CODE END LPTIM3_Init 0 */
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# J! j" a* l' J# d! @; b" D! q    /* USER CODE BEGIN LPTIM3_Init 1 */

    /* USER CODE END LPTIM3_Init 1 */
    hlptim3.Instance = LPTIM3;
& o, m" T% o$ v    hlptim3.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
9 ]# K' o: T% v6 ~" u    hlptim3.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV128;
: Z' K: k. E  f# g% I0 U    hlptim3.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
    hlptim3.Init.Period = 65535;
) H2 D- S% G2 b0 ~* H7 g    hlptim3.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
    hlptim3.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
" Z5 b$ ^$ c) d1 b( i& W: U: K    hlptim3.Init.Input1Source = LPTIM_INPUT1SOURCE_GPIO;
3 F1 s  N8 }; u3 H1 {* D4 t4 y! P0 M5 O    hlptim3.Init.Input2Source = LPTIM_INPUT2SOURCE_GPIO;
( d/ z4 j" y5 F4 U    hlptim3.Init.RepetitionCounter = 0;
    if (HAL_LPTIM_Init(&hlptim3) != HAL_OK)
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, X& N7 u0 Q8 }( L" C        Error_Handler();
    }
. X  |9 e: \. c- ^8 y2 W1 Z    /* USER CODE BEGIN LPTIM3_Init 2 */
    HAL_LPTIM_Counter_Start_IT(&hlptim3);//添加启动低功耗定时器
, p: G/ u" c* f& }    /* USER CODE END LPTIM3_Init 2 */

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; j0 [  t" E) t# s# I1 p    while (1)
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, ^9 w8 ~8 S' Y" D# j        /* -- Sample board code for User push-button in interrupt mode ---- */
        if (BspButtonState == BUTTON_PRESSED)
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/ L, N4 J/ ?, Q& M; V        /* Update button state */
        BspButtonState = BUTTON_RELEASED;
        /* -- Sample board code to toggle leds ---- */
/ l4 z8 Y" [' W: ?        BSP_LED_Toggle(LED_GREEN);
6 b) g- w3 G, ]$ c  S$ y( k0 w        /* ..... Perform your action ..... */
        }
        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);
        HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);

' A( l! ~# F* P( O4 E        /* USER CODE END WHILE */
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. Q+ R+ _1 @' C" T- N, C        /* USER CODE BEGIN 3 */
" r% e' D8 `3 D7 T, _: w    }
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    /* USER CODE BEGIN 0 */
" T- a# c4 Y( x, _6 {    void HAL_LPTIM_UpdateEventCallback(LPTIM_HandleTypeDef *hlptim)
    {//添加回调函数、唤西醒并打印提示
2 ^+ M; n/ Y- ?8 o5 O4 B/ ~        HAL_ResumeTick();
3 `+ s3 l8 z3 B" l* A        BSP_LED_On(LED_GREEN);
1 n3 \9 f  H2 Q5 g0 w9 }* E# D        printf("\r\n Exit sleep mode ! \r\n");
" H% g9 S3 Q3 O3 H. @+ I    }
    /* USER CODE END 0 */
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