Stm32 rtc interrupt 11. Follow answered Oct 21, 2014 at 14:51. I hope this help you Hello STM32 Community, I'm currently working with the RTC peripheral on an STM32F4 device, and I have a question regarding RTC alarm events. However, ChibiOS 18. Still, it is possible to trigger an alarm every minute with the RTC. The RTC wake-up timer is a feature that allows the RTC to generate an interrupt after a specified interval to wake-up the microcontroller from low-power modes. STM32 Timer interrupt period. The wakeup timer interrupt is set when the wakeup auto I was referein to 'EXTI' - external interrupt. If you had a TIM channel connected to that pin, I would recommend to 在本文作者的文章（参考文章）：细说STM32单片机USART中断实现收发控制的方法_stm32 uart 中断接收-CSDN博客中作者曾经建立了一个Cube IDE工程，利用STM32单片机的USART2串口中断程序，实现单片机接收由串口助手发送来的指令，根据指令更新RTC时间，再通过USART2串口向串口助手发送RTC时间。 Number of alarms supported by STM32 RTC device. Ask Question Asked 7 years, 11 months ago. Who we are; Investor relations; STM32 RTC includes a one-second interrupt for generating a periodic interrupt signal. I can show them on OLED screen. When the prescalers are set with their default value and the RTC is clocked by the LSE at 32. We could have used the Systick or the RTC (Real Time Clock), but in this article we will use a simple timer, timer 3 (TIM3), Feature of STM32 RTC Block. The interrupts work fine except that when I call my button handling routine the RTC interrupts are blocked. Go to solution. The RTC uses the RTC_TS pin for external timestamp, and 14 Some of the STM32 Peripheral Library RTC functions conveniently re-enables write protection behind the scenes; You don't show your interrupt routine. The best solution to get rid of the electronic noise at the pin that (over-)triggers your EXTI is to improve the hardware - but this is the software board, not the electronic one. Bit 0 WUF: Wakeup flag. I have Stm32CubeIDE and ST-LINK V2. RTC should generate an interrupt at every 5 minute, 4 second and 400msec). I also tried following: TIM_GenerateEvent(TIM2, TIM_EventSource_CC2); from SysTick interrupt. I did forget those steps initially, and the compiler didn’t raise any warnings or errors because the EXTI0_1_IRQ_handler label was already weakly linked to the ‘default interrupt handler’ in our vector table. If the flag RTC_ISR_WUTF is not reset inside of interrupt routine the interrupt is executed only once (it's normal). Learn how to setup RTC with interrupt in STM32CubeIDE and how to create a simple RTC project with periodic alarm interrupt. h" in main. The RTC core consists of counters, prescalers, clock dividers, alarm data registers, etc. Another surprise is that TIM2. The timestamp interrupt is set when a timestamp event occurs. HAL_Init() is on the first line of main(). Step2: Choose The Target MCU & Double-Click Its Name. STM32 MCUs; STM32 MCUs Products; RTC TR Time Register not incremented / updated on Options. Please check in your application which start time you set at the power-on reset. About once to twice a day, the rtc alarm is skipped, so there's a continous error, because no future alarms are set. . Share. Please share the code base or any example project, those are very much useful to us. I recommend you, when you configure the RTC Alarm with interrupt using STM32CubeMX, to follow the steps shared in Getting started with RTC - stm32mcu Wiki. Cite. led: Integrate LED for alarm Hi all! uC: STM32L433VCT CubeMX, CubeIDE, CubeProgrammer I've configured my RTC to set an alarm every minute. c to your Makefile. Green Led of NUCLEO-L476RG board is connected to PA5. STM32 Interrupt. How can we configure the registers for the same. period length (up to 1 second). When it goes to tickless mode, I set ALARM_A to the desired wake-up time. Mask everything except seconds to make your code working. Steps to follow: Configure the LED pin and the RTC alarm I want to generate periodic alarm interrupt from RTC (e. Create the project in STM32CubeIDE. Is there any example code with these settings. about the interrupt ， This function handles RTC global interrupt through EXTI lines 17, How to implement PLL in STM32? in STM32 MCUs Motor control 2024-12-18; Uart comunication in STM32 MCUs Products 2024-12-16; Top. I tried The interrupt gets called over and over again and the stack always looks like this (the program doesn't progress). The embedded RTC of a STM32 micro is an independent binary-coded-decimal (BCD) timer counter. Thank you very much for your PA1 EXTERNAL INTERRUPT ISSUE in STM32 MCUs Products 2024-12-13; Interrupt Not Triggering for External Buttons on STM32H7S78-DK in Hi, find attached my code for STM32L010x. Also, I join you the RTC interrupts array in RM0493. The wakeup timer interrupt is set when the wakeup auto Similarly, the Alarm B interrupt is set when the calendar value matches the Alarm B value. 768Khz and HSE is of 8MHz. THe date and time are freeze. I have read in other threads recommendations to use EXT driver to enable the RTC interrupt. And everything you need In this tutorial, we will experiment the Alarm feature of the RTC peripheral. It is possible to make any of the IO pins an external interrupt source when the pin is an input. 21 2 2 bronze badges \$\endgroup\$ Add a Enabled RTC Wakeup interrupt on NVIC; Result: The RTC Wakeup interrupt is not firing! Test 2: Enabled RTC for the M4; Configured RTC Wakeup parameters; Enabled RTC Wakeup interrupt on NVIC; Result: The RTC Wakeup interrupt is not firing! Made the same test configuration on a Nucleo H743ZI (single-core MCU) and there the RTC Wakeup interrupt is Posted on September 09, 2015 at 07:22 Hello, I had a quick question is it possible to setup the RTC to trigger Alarm interrupt and Wakeup counter interrupt in the same program. Posted on September 11, 2012 at 15:27 Hi guys, I'm trying to get the RTC alarm to cause an interrupt on an STM32F101 but I'm having issues. - How to configure the RTC to wake up the STM32 periodically from Low Power modes: This FAQ descripts how to configure the RTC peripheral of the STM32 to wake up the STM32 periodically from a low power mode. 0 Hello, and welcome to this presentation of the STM32 Real-Time Clock. The Alarm A interrupt is set when the calendar value matches the Alarm A value. STM32F4xx devices have Real Time Clock (RTC) inside, with support of internal calibrated 32768 Hz oscillator or external (more accurate) 32768 Hz Hi Team, Need the RTC Code base with LSE or LSI as clock source and needs to get the interrupt at every 1sec rate. It utilizes an RTC wake-up timer to wake-up the CPU from the SLEEP mode every 10 sec. 4. 1. 2. Clock, Implement I2C communication between RTC and STM32 . Also, the RTC alarm does produce an interrupt when NOT in standby mode (callback function does send some characters to UART). This feature is native on the stm32F1xx and mapped on the existing WakeUp interrupt on other stm32 mcus. The RTC provides a time-of-day clock/calendar with programmable alarm interrupt. g. How interrupts are generated and how the CPU switches the context to the ISR and back to the main application. 0. 5 I only see the alarm's interruptions. BUT, if the MCU is in standby it cannot wake-up by the RTC alarm. File > New > STM32 Project in main panel. RTC interrupt now works after correcting the value. 4. All other capture bits are set. TLDR: You interpret alarm mask meaning inverted. touchGFX in STM32 MCUs TouchGFX and GUI 2024-11-06; Facing issue in HAL_GetTick() whille reading tick on interrupt in STM32 MCUs Products 2024 However, we have troubles with enabling the interrupt of the RTC, and configuring the RTC Alarm/Wakeup. The wakeup timer interrupt is set when the wakeup auto reload timer reaches zero. Number of the Extended Interrupts and Event Controller (EXTI) interrupt line connected to the RTC Alarm event. The interrupt signal is handled by the EXTI (External Interrupt) controller on line 17. new API: void attachSecondsInterrupt(voidFuncPtr callback) STM32 CubeMX Configurations Step1: Open CubeMX & Create New Project. Is it possible to generate interrupt like this? I tried various ways but none of them In this article we will see how to configure the RTC peripheral of the STM32 to wake up the STM32 periodically from a low power mode like STOP2 mode which is one of the lowest power modes of the STM3L4. RTC is clocked by the LSE (accurate external low-speed oscillator). STM32 external interrupt keeps triggering. Therefore, it basically works as any external interrupt I am having a problem about RTC Alarm configuration. 768 kHz, the frequencies of this signal can be either 512 Hz or 1 Hz. CC2IF is cleared in TIM2-SR. STM32 Timer Interrupts. And I put a LED toggle to: void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc) { The RTC Scheduler uses the Real-Time Clock peripheral to implement an efficient scheduling mechanism. 5. I'm trying to do that interruption with RTC and i configure the RTC and program my interrupt routine but my code is not working. lcd: Integrate LCD with STM32. The tamper 1, 2 and 3 interrupts are set when a tamper event is detected respectively on the RTC_TAMP1 , RTC: When FreeRTOS is running, it ticks every 1 ms using the RTC with the lowest possible priority (configLIBRARY_LOWEST_INTERRUPT_PRIORITY). RTC peripheral has also backup register support, which means that when you reset MCU, registers are not reset or if power is Three dedicated maskable interrupt lines: – Alarm interrupt, for generating a software programmable alarm interrupt. To enable the alarm interrupt, it is necessary to refer to the reference manual. After waking up, I set the RTC back to a 1 ms tick. Any interrupt can wake the processor from 'sleep' mode. I'm using this resource as my code starter. new API: void attachSecondsInterrupt(voidFuncPtr callback) I am using STM32L4476RG adn CubeMx and trying make a interruption by RTC clock e. h, and add nvic. Please refer to this article which is made for seconds, but the principle remains the same for minutes. You must clear both RTC and EXTI interrupt flags there. The following code from the function ''void HAL_RTC_AlarmIRQHandler(RTC_HandleTypeDef* hrtc)'' /* Clear the AlarmA interrupt pending bit */ _ Updated clock and calendar using DS1307 RTC and timer interrupt. /** * A simple sketch that set the time to * 2022-04-20 at 16:00:00 * and an alarm at * 16:00:10 * the result is the interrupt after 10 secs * and wake from deep sleep status. Post by pinnchus » Sun Feb 08, 2015 3:49 pm . First of all, STM32 HAL Library RTC Alarm. It is not available on some stm32F0 devices. Now, how to set the RTC to tick every 1 ms? Here are my calculations: After changing the value of #define, I forgot to update the value in that function. 0) for STM32L4 does not clear the RTC ALARM interrupt flag. I. Standby mode is the hardest one to work with/recover from. Next one is internal RTC library. STM32 Nucleo H743ZI2 Timer interrupt problem with ethernet. The onboard push button of STM32 Nucleo is connected to an external pull-up resistor. About STMicroelectronics. If I let always the flag PWR_CR_DBP set, the interrupt is executed but the RTC clock is stoped. Posted on October 16, 2017 at 15:52 Hi I was running RTC with stm32f I use cmsis and using LSE(768 khz) for rtc. I have already developed the drivers to manage the GPIO, I have the RTC set for a 1 Hz interrupt. Several RTC events can generate an interrupt. This is needed because I use Standby for long sleep (~1s) and Stop mode for short sleep (6-8ms) while the external senso Hello @Duccio,. But can't generate alarm interrupt. Regards, Chahinez. Posted on November 30, 2016 at 16:21 Hi, The latest release of RTC HAL library (1. RTC Alarm Callback STM32MP13 – RTC Real-time clock Revision 1. 03:00:00 and the alarm time is set to 2 minutes and masked for the minutes, the interrupt will be triggered at 03:02:00, so it looks like after 2 minutes, but then only after one The STM32 microcontrollers are currently Finally the HAL_RTC_SetAlarm_IT function is needed to tell the microcontroller that we will be using an interrupt when the RTC time values matches It’s been some time when I post last library. LAN8742A Link status delay in STM32 MCUs Embedded software 2024-12-05; The problem is that it doesnt trigger an interrupt, i reset my RTC so the RTC and Alarm should match each other perfectly after i boot it on but it never triggers an interrupt. STM32 RTC includes a one-second interrupt for generating a periodic interrupt signal. I've been able to generate interrupts at specific intervals, such as 250ms or 500ms etc, using the RTC alarm feature. 2. STM32 Timer Interrupts causing Debug problems. PS: From STM32 Processor Programming Manual I read: "STM32 interrupts are both level-sensitive and pulse-sensitive". When an alarm occurs, the next alarm gets set and so on. The RTC clock which I used is LSE. The LSE is 32. Subscribe to RSS Feed; Mark Topic as New; Mark Topic as Read; The RTC alarm interrupt is issued after 7 seconds - as we would expect. Let it be A9 pin for example! Welcome to our comprehensive article on the STM32’s internal Real-Time Clock (RTC), clock system, and battery backup (VBAT). in STM32 MCUs Products 2024-12-15 The STM32 Core contains HAL code in stm32f1xx_hal_rtc_ex. STM32F4xx devices have Real Time Clock (RTC) inside, with support of internal calibrated 32768 Hz oscillator or external (more accurate) 32768 Hz oscillator. User configurable clock modes to switch between 12h and 24h with instant time conversion. STM32L476 has its RTC alarm interrupt connected to EXTI line as shown below: 2. This bit is set by hardware and cleared by a system reset or by setting the CWUF bit in the PWR power control register (PWR_CR) Hướng dẫn lập trình STM32 RTC Interrupt dùng STM32CubeIDE, hướng dẫn cấu hình RTC dùng interrupt, tạo RTC đơn giản với periodic alarm interrupt Well, you are confusing the RTC functions Wake-Up (time difference) and Alarm (absolute time). Unfortunately throughout all of the documentation (Mbed/STM) I can't find a callback function to use. The questions: Am I doing something wrong when trying to clear the interrupt? Why is the RTC alarm interrupt being called without initializing? EDIT: I The second section corresponds to RTC, ethernet, and USB interrupts. My code does not work, although it is generated by CubeMx, interrupt support is enabled, and the action at the interrupt is Hi, I am new to stm32 controller and trying to do RTC using baremetal. M (to blink LED or change some parameter STM32 RTC Default Interruption Doesn't Work, CubeMX Config. I'd be very grateful if anyone could help me with the code below. The aim of this wiki is to explain how to setup RTC with interrupt in STM32CubeIDE and how to create a simple RTC project with periodic alarm interrupt. I found out that I should use RTC_IRQHandler, but in my project I can't found this function, I don't know how to enable RTC interruption, in cube V1. Let it be A8 pin for example! (The LED Pin)Step4: Click On The Pin You Want To Configure As An External Interrupt Input. STM32 Timer Interrupt unexpected behavior. save interrupt state // 2. Enable alarm interrupt. Below are the images showing the clock configuration. However, this functionality is not currently included in the STM32RTC library. But if static void MX_RTC_Init(void) { /* Enable the RTC Alarm Interrupt */ /* USER CODE BEGIN RTC_Init 0 */ /* USER CODE END RTC_Init 0 */ RTC_TimeTypeDef sTime = {0}; RTC Interrupt service routine for watchdog timer on STM32 Discovery. In EXTI line 20 is connected to the RTC Wakeup event (available only on STM32F070xB and STM32F030xC devices) EXTI line 23 is connected to the internal I2C1 wakeup event ; What you can do is configuring an external interrupt on the GPIO pin of the corresponding SPI line which will wake up the controller. The interrupt also triggers sometimes, but not every time the. So I think data crush has occurred. Overview of the STM32 MCUs advanced RTC AN4759 - Rev 9 page 2/61 (1) Features RTC2 RTC3 Tamper detection Independent watchdog linked to an internal tamper for potential detection timeout - X Active tamper - X Monotonic counter - X SAES key storage - X Secure protection modes - X Privileged protection mode - X When the microcontroller is in Standby mode and an RTC interrupt occurs the WUF: Wakeup flag will be set by the hardware in the PWR control/status register (Page 162). The RTC My problem is that when the rtc alarm is activated, it prints the message that is in the interrupt every 10 seconds, but it stops printing the messages that are in the while loop of the main. replaces the EXT driver with PAL driver and I have hard times finding the right function to enable it. TL;DR: I see that the WUTF bit in RTC ISR register is correctly set after the RTC wake up timer period elapses, but the interrupt service routine is never entered. So the program compiled and uploaded, but nothing happened when I pressed On the other hand if you clear the flag as soon as you can, this second event would pulse the interrupt whose state in the CPU would change to "pending and active": a second IRQ would happen. Reading Time&Date functions are working. PSC is set to 0 when I expressly set it to 3. zero. I am working on a project where I need to execute 2 pieces of code off TIM interrupts. Hello everyone, I need help to generate an interrupt from RTC every second on a board using STM32F4xx. In this tutorial, we’ll discuss the ARM cortex interrupts/exceptions, and how priority works. First interrupt section is for external pins (P0 to P15) on each port, and other section is for other events, like RTC interrupt, Ethernet Overview of the STM32 MCUs advanced RTC AN4759 - Rev 9 page 2/61 (1) Features RTC2 RTC3 Tamper detection Independent watchdog linked to an internal tamper for potential detection timeout - X Active tamper - X Monotonic counter - X SAES key storage - X Secure protection modes - X Privileged protection mode - X The RTC is "Real Time Clock", it is an independent binary-coded decimal (BCD) timer/counter. This does not work for Standby mode. The vectors table helps you select the correct RTC alarm interrupt. push_buttons: Implement GPIO interrupts for controlling the system. I2C and interrupts on SCL in STM32 MCUs Products 2024-12-16; stm32f4 interrupts and i2c Don’t forget to #include "nvic. Thank you for your question! Have a look on this thread. as an example, there is an In this article we will use a general STM32 timer in order to generate an interrupt every second. Below are all relevant routines. Imagine that RTC timer work in a way that it every second (in fact it is subsecond) checks actual time agains time specified in alarm configuration. The LSE crystal is used to provide the clock to the RTC whereas the HSE will be used to clock the r The proper way of achieving 1 second interrupts with RTC is to use all alarm mask because this way none of the fields are compared and when Finally the HAL_RTC_SetAlarm_IT function is needed to tell the microcontroller that we will be using an interrupt when the RTC time values matches those of the alarm. It covers the main features of this peripheral, • Two programmable alarms with wakeup interrupt function • A periodic flag with programmable resolution, How to use multiple timer capture Interrupt in stm32 in STM32 MCUs Products 2024-12-15 Unable to enable the EXTI Line 1 Interrupt for NUCLEO-WL55JC1 in STM32CubeIDE (MCUs) 2024-12-15 I want to do ADC on 5 channels with stm32f722ze, but cannot obtain data on the latter 2 channels. g every day at 10 A. It’s been some time when I post last library. RTC alarm is indeed meant to trigger at a specific time and date. that'd likely have smaller variations between the RTC Alarm+Standby: Waking up from standby works once, but returns immediatelly afterwards in STM32 MCUs Products 2023-11-02; STM32F103x strange behavior using HAL_RTC_GetTime() together with RTC interrupts (ALR and SEC flags) in STM32CubeIDE (MCUs) 2023-10-15; STM32WLE RTC AlarmA for wake-up from Standby in STM32 MCUs Hello @Rodo . STM32F0 - Multiple I am attempting to wake an STM32L073RZ from stop mode using WAKEUP_PIN_1. The tamper 1, 2 and 3 interrupts are set when a tamper event is detected respectively on the RTC_TAMP1 , 1. e. by tilz0R · October 20, 2014. to wake from the RTC you will use the callback function: HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc) but I cannot find an equivalent This procedure was pretty accurate when I was testing a 1 second interrupt execution with TIM2). RTC Alarm Interruption. in STM32 MCUs Products 2024-11-08; STM32L031 RTC Wake up interrupt service routine never entered in STM32 MCUs Embedded software 2024-11-06; STM32F7 USB endpoint stuck in STM32 MCUs Embedded software 2024-11-04; RTC wake up timer with stop mode dont work stm32L031 in Arduino for STM32. How can I active it ? Its my code for adjusting rtc static void RTC_Config(void) { RTC_TimeTypeDef RTC_TimeStruct; RTC_InitTypeDef RTC_ Hello! I have configured the RTC in cube with a frequency of 1Hz in the board STM32WB55, and I want so as to each second the RTC interruption set a task. STM32 SPI dropping data while using interrupt. When enabled, the RTC can produce an Alarm interrupt when the clock/calendar reaches a programed date/time. RTC Alarms A and B triggered. I like to wakeup my rtc in a second interval using wakeup interrupt. Therefore, in the first section, As discussed earlier, we can configure GPIO interrupts of STM32 to detect the rising or falling edges of a signal. I have buttons, that when pressed, trigger a rising edge interrupt. They remain block until the button is released. STM32L151 RTC Alarm interrupt. For the timer peripherals in their default configuration, the prescaler and counter are "pre-loaded" via a shadow register, which means that when you write new prescaler and auto-reload values (PSC and ARR) the new values do not Hi, I want to trigger the RTC alarm interrupt 10 seconds after the currently read time. How to make a microsecond-precise timer on the STM32L-Discovery ARM board? 2. Configure the GPIO that is connected to the user Button as External Interrupt (EXTI) with falling edge trigger using STM32CubeIDE; Learn how to configure the Interrupt Controller : the NVIC; Verify the correct functionality by pressing a button that turns on a LED; 2. Similarly, the Alarm B interrupt is set when the calendar value matches the Alarm B value. TIM2 interrupt responds but. Moderators: barthess STM32F4 RTC interrupt every second. They are split into 2 sections. The RTC doesn't counts seconds or minute sand by the way, i have no interruptions. if for example an interrupt handler say usb, that probably isn't too accurate and you may be better off measuring the rtc interrupt between 2 systick intervals. Can this be added? Otherwise, given that many Well, I need to get interrupt to react. Interrupt and task, timer interrupt, and tasks relationship. 0 Kudos Reply. We could have used the Systick or the RTC (Real Time Clock), but in this article we will use a simple timer, timer 3 (TIM3), In the library there are only examples for interruption for a specific time (for example: 07:25:00). – Seconds interrupt, for generating a periodic interrupt signal with a programmable. Losing RTC ticks after wakeup timer in STM32 MCUs Embedded software 2024-12-08; Problem with using DMA with SPI in STM32CubeIDE (MCUs) 2024-12-05; Initialisation of a slider with a a choosen value. The wakeup timer interrupt is set when the wakeup auto The STM32 IWDG runs from the LSI oscillator which is nominally 40KHz, Why doesn't enabling the rtc interrupt show in the /proc/interrupts? 2. I'm running MbedOS 5. Anyway, because I don't need RTC Calendar, I've removed any setting/reading date/time as I don't need them. I wouldn't thinkit would behave this way for an edge triggered interrupt. I am using the Nucleo F446RE board and it has both, LSE and HSE crystals on board. CH2 IC interrupt. All interrupts can wake the microprocessor up from all low-power modes. The idea is to delay next alarm by 1 more minute each time the alarm is triggered. Step3: Click On The Pin You Want To Configure As An Output & Select Output Option. If this is e. What's stopping the MCU from entering the interrupt routine? Each STM32F4 device has 23 external interrupt or event sources. disable only the interrupts necessary // You get atomic access to Posted on March 25, 2012 at 15:39 Hi all,I am using the STM32F103CB microcontroller to develop an embedded application for wireless communications that needs to sleep and wake up periodically in order to save energy, as it runs from batteries. After that the proper SPI RX interrupt RTC_OUT2 outputs can also provide a calibration output signal, extracted from the prescalers. The RTC is running but the interrupt doesn't seem to be being triggered. Everything relating there are interrupts that happens between 2 separate reads of systick. I need interruption to happen every second. – Overflow interrupt, to detect when the internal programmable counter rolls over to. My function to Similarly, the Alarm B interrupt is set when the calendar value matches the Alarm B value. RTC Alarms A and B triggered Andreas' Blog on How to properly enable/disable interrupts in ARM Cortex-M? STM32 delay ms function : Which STM32 family is your favorite? STM32F series - General purpose microcontrollers; MCU wakes-up from standby mode by external signal on the wake-up pin (PA0). handler to generate TIM2. In this tutorial, we will experiment the Alarm feature of the RTC peripheral. ChibiOS public support forum for topics related to the STMicroelectronics STM32 family of micro-controllers. I am wondering what the equation for the interrupt execution frequency rates (Hz) looks like for the LPTIM peripherals, and how to set up the LPTIM peripherals to produce an interrupt periodically properly. jvr jvr. RTC interrupt is enabled in NVIC though, and the interrupt service routine function name matches the one in the startup file. In today’s fast-paced world, precise timekeeping and effective power management are essential Anyway couldn't successfully implement the "RTC Wake Up" method. 6. In addition, the RTC can as well provide an automatic wakeup to manage all low-power modes. When enabled, the RTC can produce an Alarm interrup t when the clock/calendar reaches a In this article we will use a general STM32 timer in order to generate an interrupt every second. Configure GPIO. c to implement the RTC's built-in one second interrupt. Not required, since RTC Alarm interrupt could be routed directly to Nested Vectored Interrupt Controller (NVIC) and to Power Control (PWR) wake-up pins on some series. It has a configurable alarm feature that can be configured to generate an interrupt on a specific date, with sub-second precision. I want to trig the RTC_IRQ on each second. The RTC clock is working well if I don't use the interrupt. Timer interrupt and scheduling. Regards, Srinivas The standard technique to enforce atomic access to volatile variables shared with ISRs, via "atomic access guards" or "interrupt guards", in particular when running a bare metal, single-threaded cooperative multi-tasking application with no operating system, is as follows: // 1. The wake-up timer value is based on the RTC clock source and the selected - PWR_SLEEP : This example explains h ow to enter the Sleep mode and wake up from this mode by using an interrupt. gcpffu aetvnw djyclvbg yftk gckjd jaucn tqjvonk rhwurw cfm xlwfs