What is IWDG?
Hello and welcome to this presentation of the STM32 independent watchdog (IWDG). It covers the main features of this peripheral which can be used either as a watchdog to reset the microcontroller when a problem occurs, or as a free-running timer for application timeout management.
How many bits is Iwdg?
The IWDG features a 12-bit free-running downcounter. It is clocked by an independent low-speed internal RC oscillator at 32 kHz.
What is Iwdg STM32?
In STM32 microcontrollers the independent watchdog (IWDG) is a 12-bit down-counter timer clocked by its own dedicated low-speed clock (LSI) and thus stays active even if the main clock fails.
What is the difference between Iwdg and WWDG?
In this tutorial, we will see how to use IWDG (Independent Watchdog) and WWDG (Window Watchdog) in STM32. The major difference between the two is Independent Watchdog can be reset at any time before the timeout occurs, but the Window Watchdog can only be reset in a particular window of time. …
What is watchdog timer in STM32?
A watchdog timer is a simple countdown timer which is used to reset a microprocessor after a specific interval of time. In a properly operating system, software will periodically “pet” or restart the watchdog timer. After being restarted, the watchdog will begin timing another predetermined interval.
What is watchdog timer in stm32?
What best describes a watchdog timer?
A watchdog timer (sometimes called a computer operating properly or COP timer, or simply a watchdog) is an electronic or software timer that is used to detect and recover from computer malfunctions. During normal operation, the computer regularly restarts the watchdog timer to prevent it from elapsing, or “timing out”.
What is analog watchdog?
The analogue watchdog on STM32 is simply a means of generating an interrupt when some external voltage drops below or exceeds a programmable threshold level.
When is the IWDG timer set to 32 seconds?
In this project the IWDG timer is set to 32 seconds if the microcontroller did not refresh the IWDG timer within 32 seconds, assuming that the fault has occured or control got stuck somewhere, the automatic reset will be triggered.
How to refresh IDWG timer before it reaches zero?
To refresh IDWG timer before it reaches zero, HAL_StatusTypeDef HAL_IWDG_Refresh (IWDG_HandleTypeDef *hiwdg); function has to be used. Independent watchdog is started by writing the value 0xCCCC in the Key register (IWDG_KR), the counter starts counting down from the reset value of 0xFFF.
What is the independent watchdog ( IWDG ) in STM32?
In STM32 microcontrollers the independent watchdog (IWDG) is a 12-bit down-counter timer clocked by its own dedicated low-speed clock (LSI) and thus stays active even if the main clock fails.