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/**
******************************************************************************
* @file Examples_LL/RTC/RTC_ExitStandbyWithWakeUpTimer/Src/main.c
* @author MCD Application Team
* @brief This code example shows how to configure the RTC in order to work
* with the WUT through the STM32F4xx RTC LL API.
* Peripheral initialization done using LL unitary services functions.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F4xx_LL_Examples
* @{
*/
/** @addtogroup RTC_ExitStandbyWithWakeUpTimer
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Value defined for WUT */
#define RTC_WUT_TIME ((uint32_t)5) /* 5 s */
/* Oscillator time-out values */
#define LSI_TIMEOUT_VALUE ((uint32_t)100) /* 100 ms */
#define LSE_TIMEOUT_VALUE ((uint32_t)5000) /* 5 s */
#define RTC_TIMEOUT_VALUE ((uint32_t)1000) /* 1 s */
/* Defines related to Clock configuration */
/* Uncomment to enable the adequate Clock Source */
#define RTC_CLOCK_SOURCE_LSI
/*#define RTC_CLOCK_SOURCE_LSE*/
#ifdef RTC_CLOCK_SOURCE_LSI
/* ck_apre=LSIFreq/(ASYNC prediv + 1) = 256Hz with LSIFreq=32 kHz RC */
#define RTC_ASYNCH_PREDIV ((uint32_t)0x7F)
/* ck_spre=ck_apre/(SYNC prediv + 1) = 1 Hz */
#define RTC_SYNCH_PREDIV ((uint32_t)0x00F9)
#endif
#ifdef RTC_CLOCK_SOURCE_LSE
/* ck_apre=LSEFreq/(ASYNC prediv + 1) = 256Hz with LSEFreq=32768Hz */
#define RTC_ASYNCH_PREDIV ((uint32_t)0x7F)
/* ck_spre=ck_apre/(SYNC prediv + 1) = 1 Hz */
#define RTC_SYNCH_PREDIV ((uint32_t)0x00FF)
#endif
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint8_t ubButtonPress = 0;
#if (USE_TIMEOUT == 1)
uint32_t Timeout = 0; /* Variable used for Timeout management */
#endif /* USE_TIMEOUT */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Configure_RTC(void);
void EnterStandbyMode(void);
void LED_Init(void);
void LED_Blinking(uint32_t Period);
void UserButton_Init(void);
void WaitForUserButtonPress(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* Configure the system clock to 100 MHz */
SystemClock_Config();
/* Initialize LED2 */
LED_Init();
/* Initialize button in EXTI mode */
UserButton_Init();
/* Configure RTC to use WUT */
Configure_RTC();
/* Check and handle if the system was resumed from StandBy mode */
if(LL_PWR_IsActiveFlag_SB() != 1)
{
/* ##### Run after normal reset ##### */
/* Fast Toggle LED in waiting for user-button press */
WaitForUserButtonPress();
/* Enable wake-up timer and enter in standby mode */
EnterStandbyMode();
}
else
{
/* ##### Run after standby mode ##### */
/* Clear Standby flag*/
LL_PWR_ClearFlag_SB();
/* Reset RTC Internal Wake up flag */
LL_RTC_ClearFlag_WUT(RTC);
/* Slow Toggle LED */
LED_Blinking(LED_BLINK_SLOW);
}
/* Infinite loop */
while (1)
{
}
}
/**
* Brief This function configures RTC.
* Param None
* Retval None
*/
void Configure_RTC(void)
{
/*##-1- Enables the PWR Clock and Enables access to the backup domain #######*/
/* To change the source clock of the RTC feature (LSE, LSI), you have to:
- Enable the power clock
- Enable write access to configure the RTC clock source (to be done once after reset).
- Reset the Back up Domain
- Configure the needed RTC clock source */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
LL_PWR_EnableBkUpAccess();
/*##-2- Configure LSE/LSI as RTC clock source ###############################*/
#ifdef RTC_CLOCK_SOURCE_LSE
/* Enable LSE only if disabled.*/
if (LL_RCC_LSE_IsReady() == 0)
{
LL_RCC_ForceBackupDomainReset();
LL_RCC_ReleaseBackupDomainReset();
LL_RCC_LSE_Enable();
#if (USE_TIMEOUT == 1)
Timeout = LSE_TIMEOUT_VALUE;
#endif /* USE_TIMEOUT */
while (LL_RCC_LSE_IsReady() != 1)
{
#if (USE_TIMEOUT == 1)
if (LL_SYSTICK_IsActiveCounterFlag())
{
Timeout --;
}
if (Timeout == 0)
{
/* LSE activation error */
LED_Blinking(LED_BLINK_ERROR);
}
#endif /* USE_TIMEOUT */
}
LL_RCC_SetRTCClockSource(LL_RCC_RTC_CLKSOURCE_LSE);
/*##-3- Enable RTC peripheral Clocks #######################################*/
/* Enable RTC Clock */
LL_RCC_EnableRTC();
}
#elif defined(RTC_CLOCK_SOURCE_LSI)
/* Enable LSI */
LL_RCC_LSI_Enable();
#if (USE_TIMEOUT == 1)
Timeout = LSI_TIMEOUT_VALUE;
#endif /* USE_TIMEOUT */
while (LL_RCC_LSI_IsReady() != 1)
{
#if (USE_TIMEOUT == 1)
if (LL_SYSTICK_IsActiveCounterFlag())
{
Timeout --;
}
if (Timeout == 0)
{
/* LSI activation error */
LED_Blinking(LED_BLINK_ERROR);
}
#endif /* USE_TIMEOUT */
}
LL_RCC_ForceBackupDomainReset();
LL_RCC_ReleaseBackupDomainReset();
LL_RCC_SetRTCClockSource(LL_RCC_RTC_CLKSOURCE_LSI);
/*##-3- Enable RTC peripheral Clocks #######################################*/
/* Enable RTC Clock */
LL_RCC_EnableRTC();
#else
#error "configure clock for RTC"
#endif
/*##-4- Configure RTC ######################################################*/
/* Disable RTC registers write protection */
LL_RTC_DisableWriteProtection(RTC);
/* Set prescaler according to source clock */
LL_RTC_SetAsynchPrescaler(RTC, RTC_ASYNCH_PREDIV);
LL_RTC_SetSynchPrescaler(RTC, RTC_SYNCH_PREDIV);
/* Disable wake up timer to modify it */
LL_RTC_WAKEUP_Disable(RTC);
/* Wait until it is allow to modify wake up reload value */
#if (USE_TIMEOUT == 1)
Timeout = RTC_TIMEOUT_VALUE;
#endif /* USE_TIMEOUT */
while (LL_RTC_IsActiveFlag_WUTW(RTC) != 1)
{
#if (USE_TIMEOUT == 1)
if (LL_SYSTICK_IsActiveCounterFlag())
{
Timeout --;
}
if (Timeout == 0)
{
/* LSI activation error */
LED_Blinking(LED_BLINK_ERROR);
}
#endif /* USE_TIMEOUT */
}
/* Setting the Wakeup time to RTC_WUT_TIME s
If LL_RTC_WAKEUPCLOCK_CKSPRE is selected, the frequency is 1Hz,
this allows to get a wakeup time equal to RTC_WUT_TIME s
if the counter is RTC_WUT_TIME */
LL_RTC_WAKEUP_SetAutoReload(RTC, RTC_WUT_TIME);
LL_RTC_WAKEUP_SetClock(RTC, LL_RTC_WAKEUPCLOCK_CKSPRE);
/* Enable RTC registers write protection */
LL_RTC_EnableWriteProtection(RTC);
}
/**
* @brief Function to configure and enter in STANDBY Mode.
* @param None
* @retval None
*/
void EnterStandbyMode(void)
{
/* ######## ENABLE WUT #################################################*/
/* Disable RTC registers write protection */
LL_RTC_DisableWriteProtection(RTC);
/* Enable wake up counter and wake up interrupt */
/* Note: Periodic wakeup interrupt should be enabled to exit the device
from low-power modes.*/
LL_RTC_EnableIT_WUT(RTC);
LL_RTC_WAKEUP_Enable(RTC);
/* Enable RTC registers write protection */
LL_RTC_EnableWriteProtection(RTC);
/* ######## ENTER IN STANDBY MODE ######################################*/
/** Request to enter STANDBY mode
* Following procedure describe in STM32F4xx Reference Manual
* See PWR part, section Low-power modes, Standby mode
*/
/* Reset Internal Wake up flag */
LL_RTC_ClearFlag_WUT(RTC);
/* Set Stand-by mode */
LL_PWR_SetPowerMode(LL_PWR_MODE_STANDBY);
/* Set SLEEPDEEP bit of Cortex System Control Register */
LL_LPM_EnableDeepSleep();
/* This option is used to ensure that store operations are completed */
#if defined ( __CC_ARM)
__force_stores();
#endif
/* Request Wait For Interrupt */
__WFI();
}
/**
* @brief Initialize LED2.
* @param None
* @retval None
*/
void LED_Init(void)
{
/* Enable the LED2 Clock */
LED2_GPIO_CLK_ENABLE();
/* Configure IO in output push-pull mode to drive external LED2 */
LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
/* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
//LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL);
/* Reset value is LL_GPIO_SPEED_FREQ_LOW */
//LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW);
/* Reset value is LL_GPIO_PULL_NO */
//LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO);
}
/**
* @brief Set LED2 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
* @param Period : Period of time (in ms) between each toggling of LED
* This parameter can be user defined values. Pre-defined values used in that example are :
* @arg LED_BLINK_FAST : Fast Blinking
* @arg LED_BLINK_SLOW : Slow Blinking
* @arg LED_BLINK_ERROR : Error specific Blinking
* @retval None
*/
void LED_Blinking(uint32_t Period)
{
/* Toggle IO in an infinite loop */
while (1)
{
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
LL_mDelay(Period);
}
}
/**
* @brief Configures User push-button in EXTI mode.
* @param None
* @retval None
*/
void UserButton_Init(void)
{
/* Enable the BUTTON Clock */
USER_BUTTON_GPIO_CLK_ENABLE();
/* Configure GPIO for BUTTON */
LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
LL_GPIO_SetPinPull(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_PULL_NO);
/* Connect External Line to the GPIO*/
USER_BUTTON_SYSCFG_SET_EXTI();
/* Enable a rising trigger EXTI line 13 Interrupt */
USER_BUTTON_EXTI_LINE_ENABLE();
USER_BUTTON_EXTI_FALLING_TRIG_ENABLE();
/* Configure NVIC for USER_BUTTON_EXTI_IRQn */
NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
NVIC_SetPriority(USER_BUTTON_EXTI_IRQn,0x03);
}
/**
* @brief Wait for User push-button press to start transfer.
* @param None
* @retval None
*/
/* */
void WaitForUserButtonPress(void)
{
while (ubButtonPress == 0)
{
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
LL_mDelay(LED_BLINK_FAST);
}
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 100000000
* HCLK(Hz) = 100000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 400
* PLL_P = 4
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 3
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
/* Enable HSE oscillator */
LL_RCC_HSE_EnableBypass();
LL_RCC_HSE_Enable();
while(LL_RCC_HSE_IsReady() != 1)
{
};
/* Set FLASH latency */
LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
/* Main PLL configuration and activation */
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 400, LL_RCC_PLLP_DIV_4);
LL_RCC_PLL_Enable();
while(LL_RCC_PLL_IsReady() != 1)
{
};
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
};
/* Set APB1 & APB2 prescaler */
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
/* Set systick to 1ms */
SysTick_Config(100000000 / 1000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
SystemCoreClock = 100000000;
}
/******************************************************************************/
/* USER IRQ HANDLER TREATMENT */
/******************************************************************************/
/**
* @brief Function to manage User button
* @param None
* @retval None
*/
void UserButton_Callback(void)
{
/* Update User push-button variable : to be checked in waiting loop in main function */
ubButtonPress = 1;
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/