Description

Watchdog (WDOG) Peripheral API.

This module contains functions to control the WDOG peripheral of Silicon Labs 32-bit MCUs and SoCs. The WDOG resets the system in case of a fault condition.

Data Structures
struct	WDOG_Init_TypeDef
	Watchdog initialization structure.

Functions
void	WDOGn_Enable (WDOG_TypeDef *wdog, bool enable)
	Enable/disable the watchdog timer.

void	WDOGn_Feed (WDOG_TypeDef *wdog)
	Feed WDOG.

void	WDOGn_Init (WDOG_TypeDef wdog, const WDOG_Init_TypeDef init)
	Initialize WDOG (assuming the WDOG configuration has not been locked).

void	WDOGn_Lock (WDOG_TypeDef *wdog)
	Lock the WDOG configuration.

void	WDOGn_SyncWait (WDOG_TypeDef *wdog)
	Wait for the WDOG to complete all synchronization of register changes and commands.

void	WDOGn_Unlock (WDOG_TypeDef *wdog)
	Unlock the WDOG configuration.

bool	WDOGn_IsEnabled (WDOG_TypeDef *wdog)
	Get enabled status of the watchdog.

bool	WDOGn_IsLocked (WDOG_TypeDef *wdog)
	Get locked status of the watchdog.

void	WDOG_Enable (bool enable)
	Enable/disable the watchdog timer.

void	WDOG_Feed (void)
	Feed the watchdog.

void	WDOG_Init (const WDOG_Init_TypeDef *init)
	Initialize watchdog (assuming the watchdog configuration has not been locked).

void	WDOG_Lock (void)
	Lock the watchdog configuration.

bool	WDOG_IsEnabled (void)
	Get enabled status of the watchdog.

bool	WDOG_IsLocked (void)
	Get locked status of the watchdog.

Macros
#define	WDOG_SYNC_TIMEOUT 30000
	In some scenarioes when the watchdog is disabled the synchronization register might be set and not be cleared until the watchdog is enabled again.

#define	DEFAULT_WDOG WDOG
	Default WDOG instance for deprecated functions.

#define	WDOG_INIT_DEFAULT
	Suggested default configuration for WDOG initialization structure.

Enumerations
enum	WDOG_ClkSel_TypeDef { wdogClkSelULFRCO = _WDOG_CTRL_CLKSEL_ULFRCO, wdogClkSelLFRCO = _WDOG_CTRL_CLKSEL_LFRCO, wdogClkSelLFXO = _WDOG_CTRL_CLKSEL_LFXO }
	Watchdog clock selection.

enum	WDOG_PeriodSel_TypeDef { wdogPeriod_9 = 0x0, wdogPeriod_17 = 0x1, wdogPeriod_33 = 0x2, wdogPeriod_65 = 0x3, wdogPeriod_129 = 0x4, wdogPeriod_257 = 0x5, wdogPeriod_513 = 0x6, wdogPeriod_1k = 0x7, wdogPeriod_2k = 0x8, wdogPeriod_4k = 0x9, wdogPeriod_8k = 0xA, wdogPeriod_16k = 0xB, wdogPeriod_32k = 0xC, wdogPeriod_64k = 0xD, wdogPeriod_128k = 0xE, wdogPeriod_256k = 0xF }
	Watchdog period selection.

Function Documentation

◆ WDOGn_Enable()

void WDOGn_Enable	(	WDOG_TypeDef *	`wdog,`
		bool	`enable`
	)

Enable/disable the watchdog timer.

Note: This function modifies the WDOG CTRL register which requires synchronization into the low-frequency domain. If this register is modified before a previous update to the same register has completed, this function will stall until the previous synchronization has completed.

Parameters

[in]	`wdog`	A pointer to the WDOG peripheral register block.
[in]	`enable`	True to enable Watchdog, false to disable. Watchdog cannot be disabled if it's been locked.

◆ WDOGn_Feed()

void WDOGn_Feed ( WDOG_TypeDef * wdog )

Feed WDOG.

When WDOG is activated, it must be fed (i.e., clearing the counter) before it reaches the defined timeout period. Otherwise, WDOG will generate a reset.

Note: Note that WDOG is an asynchronous peripheral and when calling the WDOGn_Feed() function the hardware starts the process of clearing the counter. This process takes some time before it completes depending on the selected oscillator (up to 4 peripheral clock cycles). When using the ULFRCO for instance as the oscillator the watchdog runs on a 1 kHz clock and a watchdog clear operation might take up to 4 ms.

If the device enters EM2 or EM3 while a command is in progress then that command will be aborted. An application can use WDOGn_SyncWait() to wait for a command to complete.

Parameters

[in] wdog A pointer to the WDOG peripheral register block.

◆ WDOGn_Init()

void WDOGn_Init	(	WDOG_TypeDef *	`wdog,`
		const WDOG_Init_TypeDef *	`init`
	)

Initialize WDOG (assuming the WDOG configuration has not been locked).

Note: This function modifies the WDOG CTRL register which requires synchronization into the low-frequency domain. If this register is modified before a previous update to the same register has completed, this function will stall until the previous synchronization has completed.

Parameters

[in]	`wdog`	Pointer to the WDOG peripheral register block.
[in]	`init`	The structure holding the WDOG configuration. A default setting WDOG_INIT_DEFAULT is available for initialization.

◆ WDOGn_Lock()

void WDOGn_Lock ( WDOG_TypeDef * wdog )

Lock the WDOG configuration.

This prevents errors from overwriting the WDOG configuration, possibly disabling it. Only a reset can unlock the WDOG configuration once locked.

If the LFRCO or LFXO clocks are used to clock WDOG, consider using the option of inhibiting those clocks to be disabled. See the WDOG_Enable() initialization structure.

Note: This function modifies the WDOG CTRL register which requires synchronization into the low-frequency domain. If this register is modified before a previous update to the same register has completed, this function will stall until the previous synchronization has completed.

Parameters

[in] wdog A pointer to WDOG peripheral register block.

◆ WDOGn_SyncWait()

void WDOGn_SyncWait ( WDOG_TypeDef * wdog )

Wait for the WDOG to complete all synchronization of register changes and commands.

Parameters

[in] wdog A pointer to WDOG peripheral register block.

◆ WDOGn_Unlock()

void WDOGn_Unlock ( WDOG_TypeDef * wdog )

Unlock the WDOG configuration.

Note that this function will have no effect on devices where a reset is the only way to unlock the watchdog.

Parameters

[in] wdog A pointer to WDOG peripheral register block.

◆ WDOGn_IsEnabled()

bool WDOGn_IsEnabled ( WDOG_TypeDef * wdog )

inline

Get enabled status of the watchdog.

Parameters

[in] wdog Pointer to WDOG peripheral register block.

Returns: True if watchdog is enabled.

◆ WDOGn_IsLocked()

bool WDOGn_IsLocked ( WDOG_TypeDef * wdog )

inline

Get locked status of the watchdog.

Parameters

[in] wdog Pointer to WDOG peripheral register block.

Returns: True if watchdog is locked.

◆ WDOG_Enable()

void WDOG_Enable ( bool enable )

inline

Enable/disable the watchdog timer.

Parameters

[in] enable Set to true to enable watchdog, false to disable. Watchdog cannot be disabled if watchdog has been locked.

◆ WDOG_Feed()

void WDOG_Feed ( void )

inline

Feed the watchdog.

◆ WDOG_Init()

void WDOG_Init ( const WDOG_Init_TypeDef * init )

inline

Initialize watchdog (assuming the watchdog configuration has not been locked).

Parameters

[in] init Structure holding watchdog configuration. A default setting WDOG_INIT_DEFAULT is available for initialization.

◆ WDOG_Lock()

void WDOG_Lock ( void )

inline

Lock the watchdog configuration.

◆ WDOG_IsEnabled()

bool WDOG_IsEnabled ( void )

inline

Get enabled status of the watchdog.

Returns: True if watchdog is enabled.

◆ WDOG_IsLocked()

bool WDOG_IsLocked ( void )

inline

Get locked status of the watchdog.

Returns: True if watchdog is locked.

Macro Definition Documentation

◆ WDOG_SYNC_TIMEOUT

#define WDOG_SYNC_TIMEOUT 30000

In some scenarioes when the watchdog is disabled the synchronization register might be set and not be cleared until the watchdog is enabled again.

This will happen when for instance some watchdog register is modified while the watchdog clock is disabled. In these scenarioes we need to make sure that the software does not wait forever.

◆ DEFAULT_WDOG

#define DEFAULT_WDOG WDOG

Default WDOG instance for deprecated functions.

◆ WDOG_INIT_DEFAULT

#define WDOG_INIT_DEFAULT

Value:

         {                                                                             \
        
         true,
         
          /* Start watchdog when initialization is done. */
         
         \
        
         false,
         
          /* WDOG is not counting during debug halt. */
         
         \
        
         false,
         
          /* WDOG is not counting when in EM2. */
         
         \
        
         false,
         
          /* WDOG is not counting when in EM3. */
         
         \
        
         false,
         
          /* EM4 can be entered. */
         
         \
        
         false,
         
          /* Do not block disabling LFRCO/LFXO in CMU. */
         
         \
        
         false,
         
          /* Do not lock WDOG configuration. */
         
         \
        
         wdogClkSelLFRCO,
         
          /* Select 32.768 kHz WDOG oscillator. */
         
         \
        
         wdogPeriod_256k
         
          /* Set longest possible timeout period. */
         
         \
        
         }

Suggested default configuration for WDOG initialization structure.

Enumeration Type Documentation

◆ WDOG_ClkSel_TypeDef

enum WDOG_ClkSel_TypeDef

Watchdog clock selection.

Enumerator
wdogClkSelULFRCO	Ultra low frequency (1 kHz) clock.
wdogClkSelLFRCO	Low frequency RC oscillator.
wdogClkSelLFXO	Low frequency crystal oscillator.

◆ WDOG_PeriodSel_TypeDef

enum WDOG_PeriodSel_TypeDef

Watchdog period selection.

Enumerator
wdogPeriod_9	9 clock periods
wdogPeriod_17	17 clock periods
wdogPeriod_33	33 clock periods
wdogPeriod_65	65 clock periods
wdogPeriod_129	129 clock periods
wdogPeriod_257	257 clock periods
wdogPeriod_513	513 clock periods
wdogPeriod_1k	1025 clock periods
wdogPeriod_2k	2049 clock periods
wdogPeriod_4k	4097 clock periods
wdogPeriod_8k	8193 clock periods
wdogPeriod_16k	16385 clock periods
wdogPeriod_32k	32769 clock periods
wdogPeriod_64k	65537 clock periods
wdogPeriod_128k	131073 clock periods
wdogPeriod_256k	262145 clock periods

WDOG - Watchdog

Description

Data Structures

Functions

Macros

Enumerations

Function Documentation

◆ WDOGn_Enable()

◆ WDOGn_Feed()

◆ WDOGn_Init()

◆ WDOGn_Lock()

◆ WDOGn_SyncWait()

◆ WDOGn_Unlock()

◆ WDOGn_IsEnabled()

◆ WDOGn_IsLocked()

◆ WDOG_Enable()

◆ WDOG_Feed()

◆ WDOG_Init()

◆ WDOG_Lock()

◆ WDOG_IsEnabled()

◆ WDOG_IsLocked()

Macro Definition Documentation

◆ WDOG_SYNC_TIMEOUT

◆ DEFAULT_WDOG

◆ WDOG_INIT_DEFAULT

Enumeration Type Documentation

◆ WDOG_ClkSel_TypeDef

◆ WDOG_PeriodSel_TypeDef