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/**
******************************************************************************
* @file Examples_LL/RTC/RTC_Tamper/Src/main.c
* @author MCD Application Team
* @brief This sample code shows how to use STM32F4xx RTC LL API
* to write/read data to/from RTC Backup data registers and demonstrates
* the Tamper detection feature.
******************************************************************************
* @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_Tamper
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define BACKUP_COUNT RTC_BKP_NUMBER
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO FlagStatus TamperStatus;
/* Backup registers table */
uint32_t aBKPDataReg[BACKUP_COUNT] =
{
LL_RTC_BKP_DR0, LL_RTC_BKP_DR1, LL_RTC_BKP_DR2,
LL_RTC_BKP_DR3, LL_RTC_BKP_DR4, LL_RTC_BKP_DR5,
LL_RTC_BKP_DR6, LL_RTC_BKP_DR7, LL_RTC_BKP_DR8,
LL_RTC_BKP_DR9, LL_RTC_BKP_DR10, LL_RTC_BKP_DR11,
LL_RTC_BKP_DR12, LL_RTC_BKP_DR13, LL_RTC_BKP_DR14,
LL_RTC_BKP_DR15, LL_RTC_BKP_DR16, LL_RTC_BKP_DR17,
LL_RTC_BKP_DR18, LL_RTC_BKP_DR19
};
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Configure_RTC(void);
void Configure_RTC_Tamper(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)
{
register uint32_t index = 0;
/* Configure the system clock to 100 MHz */
SystemClock_Config();
/* Initialize LED2 */
LED_Init();
/* Configure the RTC peripheral */
Configure_RTC();
/* Configure RTC Tamper */
Configure_RTC_Tamper();
/* Write Data on the Back Up registers */
for (index = 0; index < BACKUP_COUNT; index++)
{
LL_RTC_BAK_SetRegister(RTC, aBKPDataReg[index], 0xDF59 + (index * 0x5A));
}
/* Check Data is stored on the Back Up registers */
for (index = 0; index < BACKUP_COUNT; index++)
{
if (LL_RTC_BAK_GetRegister(RTC, aBKPDataReg[index]) != (0xDF59 + (index * 0x5A)))
{
LED_Blinking(LED_BLINK_ERROR);
}
}
/* Reset flag after writing of backup register in order to wait for new button press */
TamperStatus = RESET;
/* Wait for Tamper detection */
while(TamperStatus != SET)
{
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
LL_mDelay(LED_BLINK_FAST);
}
/* LED2 On: Tamper button pressed */
LED_On();
/* Infinite loop */
while (1)
{
}
}
/**
* @brief Configure RTC.
* @param None
* @retval None
*/
void Configure_RTC(void)
{
/* Enables the PWR Clock and Enables access to the backup domain */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_PWR);
LL_PWR_EnableBkUpAccess();
/* Enable RTC Clock */
LL_RCC_EnableRTC();
}
/**
* @brief Configure the current time and date and activate Tamper.
* @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_Tamper(void)
{
/* Sampling frequency */
/* Reset value is LL_RTC_TAMPER_SAMPLFREQDIV_32768 */
//LL_RTC_TAMPER_SetSamplingFreq(RTC, LL_RTC_TAMPER_SAMPLFREQDIV_32768);
/* Precharge duration */
/* Reset value is LL_RTC_TAMPER_DURATION_1RTCCLK */
//LL_RTC_TAMPER_SetPrecharge(RTC, LL_RTC_TAMPER_DURATION_1RTCCLK);
/* Enable Pull up */
/* Reset value is pull-up enabled */
//LL_RTC_TAMPER_EnablePullUp(RTC);
/* Disable timestamp on tamper detection */
/* Reset value is timestamp on tamper disabled */
//LL_RTC_TS_DisableOnTamper(RTC);
/* Set Tamper trigger to falling edge */
/* Reset value is LL_RTC_TAMPER_FILTER_DISABLE */
//LL_RTC_TAMPER_SetFilterCount(RTC, LL_RTC_TAMPER_FILTER_DISABLE);
LL_RTC_TAMPER_EnableActiveLevel(RTC, LL_RTC_TAMPER_ACTIVELEVEL_TAMP1);
/* Enable tamper detection */
LL_RTC_TAMPER_Enable(RTC, LL_RTC_TAMPER_1);
/* Enable IT TAMPER */
LL_RTC_EnableIT_TAMP(RTC);
/* Configure the NVIC for RTC Tamper */
NVIC_SetPriority(TAMP_STAMP_IRQn, 0x0F);
NVIC_EnableIRQ(TAMP_STAMP_IRQn);
/* RTC Tamper Interrupt Configuration: EXTI configuration */
LL_EXTI_EnableIT_0_31(LL_EXTI_LINE_21);
LL_EXTI_EnableRisingTrig_0_31(LL_EXTI_LINE_21);
/* Clear the Tamper interrupt pending bit */
LL_RTC_ClearFlag_TAMP1(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;
}
/******************************************************************************/
/* USER IRQ HANDLER TREATMENT */
/******************************************************************************/
/**
* @brief Tamper event callback function
* @param None
* @retval None
*/
void Tamper_Callback(void)
{
register uint32_t index = 0;
/* Deactivate the tamper */
LL_RTC_TAMPER_Disable(RTC, LL_RTC_TAMPER_1);
/* Check Data is cleared on the Back Up registers */
for (index = 0; index < BACKUP_COUNT; index++)
{
if (LL_RTC_BAK_GetRegister(RTC, aBKPDataReg[index]) != 0x00)
{
LED_Blinking(LED_BLINK_ERROR);
}
}
TamperStatus = SET;
}
#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
/**
* @}
*/
/**
* @}
*/
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