NUCLEO-L053R8：低功耗STOP模式，RTC唤醒（例程分享）

基于ST官方NUCLEO-L053R8开发板

代码下载：见附件

Stop mode with RTC：1uA VDD=3.0V

/**
* @brief  Main program
5 q6 B; l$ v3 a/ M* @param  None
* @retval None
*/
int main(void)
3 T  `, i8 q9 ^; @& D+ o{
- R+ f% x% l& l/ h( L4 d  /* STM32L0xx HAL library initialization:
       - Configure the Flash prefetch, Flash preread and Buffer caches
       - Systick timer is configured by default as source of time base, but user
4 U) Q/ w3 y1 [/ [) q# r             can eventually implement his proper time base source (a general purpose
/ f8 }) r/ x, t             timer for example or other time source), keeping in mind that Time base
             duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
             handled in milliseconds basis.
       - Low Level Initialization
     */
) D1 p; @* b* @/ a  HAL_Init();
  
- ?: z1 E2 g' ~( m5 A' l  /* Configure LED2 to handle error handler */
  BSP_LED_Init(LED2);

  /* Configure the system clock @ 32 Mhz */
& N$ @: d: T6 ~" x' Z* O- }  SystemClock_Config();
% G' c$ Z0 ]! M. o
  /* Configure the system Power */
  SystemPower_Config();
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  while (1)
; r& M/ W3 y! Q3 [0 x1 c  {
    /* Insert 3 seconds delay */
    BSP_LED_Init(LED2);        //LED初始化
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET);        //点亮LED,延时3S，再灭LED
HAL_Delay(3000);
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: M" Q, u6 ^* ~HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET);
% A- x( s% l7 N$ q( [: e- _; @6 fHAL_Delay(3000);
! h- Y8 v* S; _5 X5 NSystemPowerNORTC_Config();        //关闭所有IO和时钟，不关闭RTC

7 x4 f/ f8 S7 f. o& W    /* Disable Wakeup Counter */
- `6 [1 p+ c8 `* M: ^2 g! B    HAL_RTCEx_DeactivateWakeUpTimer(&RTCHandle);
) O8 W; d. w; K+ l; T* k' }
    /*## Setting the Wake up time ############################################*/
& M3 T. ]: ?3 i) i) G2 u4 B    /*  RTC Wakeup Interrupt Generation:
        Wakeup Time Base = (RTC_WAKEUPCLOCK_RTCCLK_DIV /(LSE or LSI))
  Q5 {% v: M3 A        Wakeup Time = Wakeup Time Base * WakeUpCounter
                    = (RTC_WAKEUPCLOCK_RTCCLK_DIV /(LSE or LSI)) * WakeUpCounter
1 s; v! B1 o. I' ^        ==> WakeUpCounter = Wakeup Time / Wakeup Time Base
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6 u! a# d8 s( [, h$ a+ c! p3 R- r2 G1 \        To configure the wake up timer to 4s the WakeUpCounter is set to 0x1FFF:
          RTC_WAKEUPCLOCK_RTCCLK_DIV = RTCCLK_Div16 = 16
8 \) z# q& K) D          Wakeup Time Base = 16 /(~39.000KHz) = ~0,410 ms
  A+ U$ k6 j; g' t          Wakeup Time = ~4s = 0,410ms  * WakeUpCounter
0 v' A! E) O. A, q8 X: l1 A          ==> WakeUpCounter = ~4s/0,410ms = 9750 = 0x2616 */
" I" Q) ~; X6 G3 {    HAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, 0x2616, RTC_WAKEUPCLOCK_RTCCLK_DIV16);

* ^1 r& s- L, z8 g) F1 r    /* Enter Stop Mode */
    HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
- _; o/ z+ h, ~; b4 h
3 r4 Q6 |4 A. K* c    /* Configures system clock after wake-up from STOP: enable HSI, PLL and select
    PLL as system clock source (HSI and PLL are disabled automatically in STOP mode) */
    SystemClockConfig_STOP();
1 }4 o7 |) v! \( b  }
$ U: U( j6 r  e8 \1 Z/ A}
- ?5 j& ?  P  n# |4 i/ `

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一代睡神的崛起 发表于 2019-1-25 14:56
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