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/**
******************************************************************************
* @file Examples_LL/RTC/RTC_Calendar/Src/main.c
* @author MCD Application Team
* @brief This sample code shows how to use STM32F4xx RTC LL API to configure
* Time and Date.
* 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_Calendar
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Oscillator time-out values */
#define LSI_TIMEOUT_VALUE ((uint32_t)2) /* 2 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) 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
/* Define used to indicate date/time updated */
#define RTC_BKP_DATE_TIME_UPDTATED ((uint32_t)0x32F2)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Buffers used for displaying Time and Date */
uint8_t aShowTime[50] = {0};
uint8_t aShowDate[50] = {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_Clock(void);
void Configure_RTC(void);
void Configure_RTC_Calendar(void);
uint32_t Enter_RTC_InitMode(void);
uint32_t Exit_RTC_InitMode(void);
uint32_t WaitForSynchro_RTC(void);
void Show_RTC_Calendar(void);
void LED_Init(void);
void LED_On(void);
void LED_Blinking(uint32_t Period);
/* 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();
/*##-Configure the RTC peripheral #######################################*/
Configure_RTC_Clock();
/*##-Check if Data stored in BackUp register1: No Need to reconfigure RTC#*/
/* Read the Back Up Register 1 Data */
if (LL_RTC_BAK_GetRegister(RTC, LL_RTC_BKP_DR1) != RTC_BKP_DATE_TIME_UPDTATED)
{
/*##-Configure the RTC peripheral #######################################*/
Configure_RTC();
/* Configure RTC Calendar */
Configure_RTC_Calendar();
}
/* Turn-on LED2 to indicate that calendar has been well configured */
LED_On();
/* Infinite loop */
while (1)
{
/*##-3- Display the updated Time and Date ################################*/
Show_RTC_Calendar();
}
}
/**
* @brief Configure RTC clock.
* @param None
* @retval None
*/
void Configure_RTC_Clock(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);
}
#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 */
}
/* Reset backup domain only if LSI is not yet selected as RTC clock source */
if (LL_RCC_GetRTCClockSource() != LL_RCC_RTC_CLKSOURCE_LSI)
{
LL_RCC_ForceBackupDomainReset();
LL_RCC_ReleaseBackupDomainReset();
LL_RCC_SetRTCClockSource(LL_RCC_RTC_CLKSOURCE_LSI);
}
#else
#error "configure clock for RTC"
#endif
}
/**
* @brief Configure RTC.
* @note Peripheral configuration is minimal configuration from reset values.
* Thus, some useless LL unitary functions calls below are provided as
* commented examples - setting is default configuration from reset.
* @param None
* @retval None
*/
void Configure_RTC(void)
{
/*##-1- Enable RTC peripheral Clocks #######################################*/
/* Enable RTC Clock */
LL_RCC_EnableRTC();
/*##-2- Disable RTC registers write protection ##############################*/
LL_RTC_DisableWriteProtection(RTC);
/*##-3- Enter in initialization mode #######################################*/
if (Enter_RTC_InitMode() != RTC_ERROR_NONE)
{
/* Initialization Error */
LED_Blinking(LED_BLINK_ERROR);
}
/*##-4- Configure RTC ######################################################*/
/* Configure RTC prescaler and RTC data registers */
/* Set Hour Format */
LL_RTC_SetHourFormat(RTC, LL_RTC_HOURFORMAT_AMPM);
/* Set Asynch Prediv (value according to source clock) */
LL_RTC_SetAsynchPrescaler(RTC, RTC_ASYNCH_PREDIV);
/* Set Synch Prediv (value according to source clock) */
LL_RTC_SetSynchPrescaler(RTC, RTC_SYNCH_PREDIV);
/* Set OutPut */
/* Reset value is LL_RTC_ALARMOUT_DISABLE */
//LL_RTC_SetAlarmOutEvent(RTC, LL_RTC_ALARMOUT_DISABLE);
/* Set OutPutPolarity */
/* Reset value is LL_RTC_OUTPUTPOLARITY_PIN_HIGH */
//LL_RTC_SetOutputPolarity(RTC, LL_RTC_OUTPUTPOLARITY_PIN_HIGH);
/* Set OutPutType */
/* Reset value is LL_RTC_ALARM_OUTPUTTYPE_OPENDRAIN */
//LL_RTC_SetAlarmOutputType(RTC, LL_RTC_ALARM_OUTPUTTYPE_OPENDRAIN);
/*##-5- Exit of initialization mode #######################################*/
Exit_RTC_InitMode();
/*##-6- Enable RTC registers write protection #############################*/
LL_RTC_EnableWriteProtection(RTC);
}
/**
* @brief Configure the current time and date.
* @param None
* @retval None
*/
void Configure_RTC_Calendar(void)
{
/*##-1- Disable RTC registers write protection ############################*/
LL_RTC_DisableWriteProtection(RTC);
/*##-2- Enter in initialization mode ######################################*/
if (Enter_RTC_InitMode() != RTC_ERROR_NONE)
{
/* Initialization Error */
LED_Blinking(LED_BLINK_ERROR);
}
/*##-3- Configure the Date ################################################*/
/* Note: __LL_RTC_CONVERT_BIN2BCD helper macro can be used if user wants to*/
/* provide directly the decimal value: */
/* LL_RTC_DATE_Config(RTC, LL_RTC_WEEKDAY_MONDAY, */
/* __LL_RTC_CONVERT_BIN2BCD(31), (...)) */
/* Set Date: Friday December 29th 2016 */
LL_RTC_DATE_Config(RTC, LL_RTC_WEEKDAY_FRIDAY, 0x29, LL_RTC_MONTH_DECEMBER, 0x16);
/*##-4- Configure the Time ################################################*/
/* Set Time: 11:59:55 PM*/
LL_RTC_TIME_Config(RTC, LL_RTC_TIME_FORMAT_PM, 0x11, 0x59, 0x55);
/*##-5- Exit of initialization mode #######################################*/
if (Exit_RTC_InitMode() != RTC_ERROR_NONE)
{
/* Initialization Error */
LED_Blinking(LED_BLINK_ERROR);
}
/*##-6- Enable RTC registers write protection #############################*/
LL_RTC_EnableWriteProtection(RTC);
/*##-8- Writes a data in a RTC Backup data Register1 #######################*/
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR1, RTC_BKP_DATE_TIME_UPDTATED);
}
/**
* @brief Enter in initialization mode
* @note In this mode, the calendar counter is stopped and its value can be updated
* @param None
* @retval RTC_ERROR_NONE if no error
*/
uint32_t Enter_RTC_InitMode(void)
{
/* Set Initialization mode */
LL_RTC_EnableInitMode(RTC);
#if (USE_TIMEOUT == 1)
Timeout = RTC_TIMEOUT_VALUE;
#endif /* USE_TIMEOUT */
/* Check if the Initialization mode is set */
while (LL_RTC_IsActiveFlag_INIT(RTC) != 1)
{
#if (USE_TIMEOUT == 1)
if (LL_SYSTICK_IsActiveCounterFlag())
{
Timeout --;
}
if (Timeout == 0)
{
return RTC_ERROR_TIMEOUT;
}
#endif /* USE_TIMEOUT */
}
return RTC_ERROR_NONE;
}
/**
* @brief Exit Initialization mode
* @param None
* @retval RTC_ERROR_NONE if no error
*/
uint32_t Exit_RTC_InitMode(void)
{
LL_RTC_DisableInitMode(RTC);
/* Wait for synchro */
/* Note: Needed only if Shadow registers is enabled */
/* LL_RTC_IsShadowRegBypassEnabled function can be used */
return (WaitForSynchro_RTC());
}
/**
* @brief Wait until the RTC Time and Date registers (RTC_TR and RTC_DR) are
* synchronized with RTC APB clock.
* @param None
* @retval RTC_ERROR_NONE if no error (RTC_ERROR_TIMEOUT will occur if RTC is
* not synchronized)
*/
uint32_t WaitForSynchro_RTC(void)
{
/* Clear RSF flag */
LL_RTC_ClearFlag_RS(RTC);
#if (USE_TIMEOUT == 1)
Timeout = RTC_TIMEOUT_VALUE;
#endif /* USE_TIMEOUT */
/* Wait the registers to be synchronised */
while(LL_RTC_IsActiveFlag_RS(RTC) != 1)
{
#if (USE_TIMEOUT == 1)
if (LL_SYSTICK_IsActiveCounterFlag())
{
Timeout --;
}
if (Timeout == 0)
{
return RTC_ERROR_TIMEOUT;
}
#endif /* USE_TIMEOUT */
}
return RTC_ERROR_NONE;
}
/**
* @brief Display the current time and date.
* @param None
* @retval None
*/
void Show_RTC_Calendar(void)
{
/* Note: need to convert in decimal value in using __LL_RTC_CONVERT_BCD2BIN helper macro */
/* Display time Format : hh:mm:ss */
sprintf((char*)aShowTime,"%.2d:%.2d:%.2d", __LL_RTC_CONVERT_BCD2BIN(LL_RTC_TIME_GetHour(RTC)),
__LL_RTC_CONVERT_BCD2BIN(LL_RTC_TIME_GetMinute(RTC)),
__LL_RTC_CONVERT_BCD2BIN(LL_RTC_TIME_GetSecond(RTC)));
/* Display date Format : mm-dd-yy */
sprintf((char*)aShowDate,"%.2d-%.2d-%.2d", __LL_RTC_CONVERT_BCD2BIN(LL_RTC_DATE_GetMonth(RTC)),
__LL_RTC_CONVERT_BCD2BIN(LL_RTC_DATE_GetDay(RTC)),
2000 + __LL_RTC_CONVERT_BCD2BIN(LL_RTC_DATE_GetYear(RTC)));
}
/**
* @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 Turn-on LED2.
* @param None
* @retval None
*/
void LED_On(void)
{
/* Turn LED2 on */
LL_GPIO_SetOutputPin(LED2_GPIO_PORT, LED2_PIN);
}
/**
* @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 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;
}
#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\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
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