#include <stdint.h>
#include <stdbool.h>

Macros
#define	IWDG_PRESCALER_4 0u

#define	IWDG_PRESCALER_8 1u

#define	IWDG_PRESCALER_16 2u

#define	IWDG_PRESCALER_32 3u

#define	IWDG_PRESCALER_64 4u

#define	IWDG_PRESCALER_128 5u

#define	IWDG_PRESCALER_256 6u

Functions
void	IWDG_Init (uint8_t prescaler, uint16_t reload)
	Configure and start the independent watchdog.

void	IWDG_Refresh (void)
	Reload the watchdog counter ("kick" / "feed").

bool	IWDG_WasReset (void)
	Was the most recent reset caused by the IWDG?

void	IWDG_ClearResetFlag (void)
	Clear the IWDG reset flag in RCC->RSR.

Macro Definition Documentation

◆ IWDG_PRESCALER_128

#define IWDG_PRESCALER_128 5u

Definition at line 52 of file iwdg.h.

◆ IWDG_PRESCALER_16

#define IWDG_PRESCALER_16 2u

Definition at line 49 of file iwdg.h.

◆ IWDG_PRESCALER_256

#define IWDG_PRESCALER_256 6u

Definition at line 53 of file iwdg.h.

◆ IWDG_PRESCALER_32

#define IWDG_PRESCALER_32 3u

Definition at line 50 of file iwdg.h.

◆ IWDG_PRESCALER_4

#define IWDG_PRESCALER_4 0u

Definition at line 47 of file iwdg.h.

◆ IWDG_PRESCALER_64

#define IWDG_PRESCALER_64 4u

Definition at line 51 of file iwdg.h.

◆ IWDG_PRESCALER_8

#define IWDG_PRESCALER_8 1u

Definition at line 48 of file iwdg.h.

Function Documentation

◆ IWDG_ClearResetFlag()

void IWDG_ClearResetFlag ( void )

Clear the IWDG reset flag in RCC->RSR.

Note: Safe to call unconditionally; clears the flag even if it was not set. Typically called once at boot after the application has logged the reset reason.

Definition at line 78 of file iwdg.c.

◆ IWDG_Init()

void IWDG_Init	(	uint8_t	prescaler,
		uint16_t	reload
	)

Configure and start the independent watchdog.

Parameters

prescaler	One of the `IWDG_PRESCALER_*` values (3-bit PR field).
reload	12-bit reload value (1..4095). Total timeout is `(reload + 1) × prescaler_div / LSI`.

Note: Once started the IWDG cannot be stopped without a system reset. The function is idempotent — calling it twice with the same arguments is safe.

Definition at line 44 of file iwdg.c.

References IWDG_KEY_ENABLE, IWDG_KEY_REFRESH, IWDG_KEY_UNLOCK, and IWDG_PRESCALER_256.

◆ IWDG_Refresh()

void IWDG_Refresh ( void )

Reload the watchdog counter ("kick" / "feed").

Note: Must be called periodically — at least once per timeout window — or the chip will reset.

Definition at line 70 of file iwdg.c.

References IWDG_KEY_REFRESH.

◆ IWDG_WasReset()

bool IWDG_WasReset ( void )

Was the most recent reset caused by the IWDG?

Returns: true if the IWDGRST flag in RCC->RSR was set on this boot, false otherwise. The flag is sticky until cleared with IWDG_ClearResetFlag(), so this query is safe to call any number of times.

Definition at line 74 of file iwdg.c.

Macros

Functions