WDOG
EMLIB

Detailed 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

Macros

#define DEFAULT_WDOG WDOG0
#define WDOG_INIT_DEFAULT
#define WDOG_SYNC_TIMEOUT 30000

Enumerations

enum WDOG_ClkSel_TypeDef {
wdogClkSelULFRCO = _WDOG_CTRL_CLKSEL_ULFRCO,
wdogClkSelLFRCO = _WDOG_CTRL_CLKSEL_LFRCO,
wdogClkSelLFXO = _WDOG_CTRL_CLKSEL_LFXO
}
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
}
enum WDOG_WarnSel_TypeDef {
wdogWarnDisable = 0,
wdogWarnTime25pct = 1,
wdogWarnTime50pct = 2,
wdogWarnTime75pct = 3
}
enum WDOG_WinSel_TypeDef {
wdogIllegalWindowDisable = 0,
wdogIllegalWindowTime12_5pct = 1,
wdogIllegalWindowTime25_0pct = 2,
wdogIllegalWindowTime37_5pct = 3,
wdogIllegalWindowTime50_0pct = 4,
wdogIllegalWindowTime62_5pct = 5,
wdogIllegalWindowTime75_0pct = 6,
wdogIllegalWindowTime87_5pct = 7
}

Functions

__STATIC_INLINE void WDOG_Enable (bool enable)
Enable/disable the watchdog timer.
__STATIC_INLINE void WDOG_Feed (void)
Feed the watchdog.
__STATIC_INLINE void WDOG_Init (const WDOG_Init_TypeDef *init)
Initialize watchdog (assuming the watchdog configuration has not been locked).
__STATIC_INLINE bool WDOG_IsEnabled (void)
Get enabled status of the watchdog.
__STATIC_INLINE bool WDOG_IsLocked (void)
Get locked status of the watchdog.
__STATIC_INLINE void WDOG_Lock (void)
Lock the watchdog configuration.
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).
__STATIC_INLINE void WDOGn_IntClear (WDOG_TypeDef *wdog, uint32_t flags)
Clear one or more pending WDOG interrupts.
__STATIC_INLINE void WDOGn_IntDisable (WDOG_TypeDef *wdog, uint32_t flags)
Disable one or more WDOG interrupts.
__STATIC_INLINE void WDOGn_IntEnable (WDOG_TypeDef *wdog, uint32_t flags)
Enable one or more WDOG interrupts.
__STATIC_INLINE uint32_t WDOGn_IntGet (WDOG_TypeDef *wdog)
Get pending WDOG interrupt flags.
__STATIC_INLINE uint32_t WDOGn_IntGetEnabled (WDOG_TypeDef *wdog)
Get enabled and pending WDOG interrupt flags.
__STATIC_INLINE void WDOGn_IntSet (WDOG_TypeDef *wdog, uint32_t flags)
Set one or more pending WDOG interrupts from SW.
__STATIC_INLINE bool WDOGn_IsEnabled (WDOG_TypeDef *wdog)
Get enabled status of the watchdog.
__STATIC_INLINE bool WDOGn_IsLocked (WDOG_TypeDef *wdog)
Get locked status of the watchdog.
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.

Macro Definition Documentation

#define DEFAULT_WDOG   WDOG0

Default WDOG instance for deprecated functions.

Definition at line 60 of file em_wdog.h .

Referenced by WDOG_Enable() , WDOG_Feed() , WDOG_Init() , WDOG_IsEnabled() , WDOG_IsLocked() , and WDOG_Lock() .

#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. */ \
wdogWarnDisable, /* Disable warning interrupt. */ \
wdogIllegalWindowDisable, /* Disable illegal window interrupt. */ \
false /* Do not disable reset. */ \
}

Suggested default configuration for WDOG initialization structure.

Definition at line 199 of file em_wdog.h .

Enumeration Type Documentation

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

Definition at line 72 of file em_wdog.h .

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

Definition at line 80 of file em_wdog.h .

enum WDOG_WarnSel_TypeDef

Select watchdog warning timeout period as percentage of timeout.

Definition at line 102 of file em_wdog.h .

enum WDOG_WinSel_TypeDef

Select watchdog illegal window limit.

Definition at line 113 of file em_wdog.h .

Function Documentation

__STATIC_INLINE void WDOG_Enable ( bool enable )

Enable/disable the watchdog timer.

Deprecated:
Deprecated function. New code should use WDOGn_Enable() . This function uses DEFAULT_WDOG .
Parameters
[in] enable Set to true to enable watchdog, false to disable. Watchdog cannot be disabled if watchdog has been locked.

Definition at line 414 of file em_wdog.h .

References DEFAULT_WDOG , and WDOGn_Enable() .

__STATIC_INLINE void WDOG_Feed ( void )

Feed the watchdog.

Deprecated:
Deprecated function. New code should use WDOGn_Feed() . This function uses DEFAULT_WDOG .

Definition at line 427 of file em_wdog.h .

References DEFAULT_WDOG , and WDOGn_Feed() .

__STATIC_INLINE void WDOG_Init ( const WDOG_Init_TypeDef * init )

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

Deprecated:
Deprecated function. New code should use WDOGn_Init() . This function uses DEFAULT_WDOG .
Parameters
[in] init Structure holding watchdog configuration. A default setting WDOG_INIT_DEFAULT is available for initialization.

Definition at line 445 of file em_wdog.h .

References DEFAULT_WDOG , and WDOGn_Init() .

__STATIC_INLINE bool WDOG_IsEnabled ( void )

Get enabled status of the watchdog.

Deprecated:
Deprecated function. New code should use WDOGn_IsEnabled() . This function uses DEFAULT_WDOG .

Definition at line 471 of file em_wdog.h .

References DEFAULT_WDOG , and WDOGn_IsEnabled() .

__STATIC_INLINE bool WDOG_IsLocked ( void )

Get locked status of the watchdog.

Deprecated:
Deprecated function. New code should use WDOGn_IsLocked() . This function uses DEFAULT_WDOG .

Definition at line 484 of file em_wdog.h .

References DEFAULT_WDOG , and WDOGn_IsLocked() .

__STATIC_INLINE void WDOG_Lock ( void )

Lock the watchdog configuration.

Deprecated:
Deprecated function. New code should use WDOGn_Lock() . This function uses DEFAULT_WDOG .

Definition at line 458 of file em_wdog.h .

References DEFAULT_WDOG , and WDOGn_Lock() .

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.

Definition at line 80 of file em_wdog.c .

References BUS_RegBitWrite() .

Referenced by WDOG_Enable() , and WDOGn_Init() .

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.

Definition at line 142 of file em_wdog.c .

References CORE_DECLARE_IRQ_STATE , CORE_ENTER_ATOMIC , and CORE_EXIT_ATOMIC .

Referenced by WDOG_Feed() .

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.

Definition at line 204 of file em_wdog.c .

References WDOG_Init_TypeDef::clkSel , WDOG_Init_TypeDef::debugRun , WDOG_Init_TypeDef::em2Run , WDOG_Init_TypeDef::em3Run , WDOG_Init_TypeDef::em4Block , WDOG_Init_TypeDef::enable , WDOG_Init_TypeDef::lock , WDOG_Init_TypeDef::perSel , WDOG_Init_TypeDef::resetDisable , WDOG_Init_TypeDef::swoscBlock , WDOG_Init_TypeDef::warnSel , WDOGn_Enable() , WDOGn_Lock() , and WDOG_Init_TypeDef::winSel .

Referenced by WDOG_Init() .

__STATIC_INLINE void WDOGn_IntClear ( WDOG_TypeDef * wdog,
uint32_t flags
)

Clear one or more pending WDOG interrupts.

Parameters
[in] wdog Pointer to WDOG peripheral register block.
[in] flags WDOG interrupt sources to clear. Use a set of interrupt flags OR-ed together to clear multiple interrupt sources.

Definition at line 252 of file em_wdog.h .

__STATIC_INLINE void WDOGn_IntDisable ( WDOG_TypeDef * wdog,
uint32_t flags
)

Disable one or more WDOG interrupts.

Parameters
[in] wdog Pointer to WDOG peripheral register block.
[in] flags WDOG interrupt sources to disable. Use a set of interrupt flags OR-ed together to disable multiple interrupt.

Definition at line 272 of file em_wdog.h .

__STATIC_INLINE void WDOGn_IntEnable ( WDOG_TypeDef * wdog,
uint32_t flags
)

Enable one or more WDOG interrupts.

Note
Depending on the use, a pending interrupt may already be set prior to enabling the interrupt. To ignore a pending interrupt, consider using WDOG_IntClear() prior to enabling the interrupt.
Parameters
[in] wdog Pointer to WDOG peripheral register block.
[in] flags WDOG interrupt sources to enable. Use a set of interrupt flags OR-ed together to set multiple interrupt.

Definition at line 297 of file em_wdog.h .

__STATIC_INLINE uint32_t WDOGn_IntGet ( WDOG_TypeDef * wdog )

Get pending WDOG interrupt flags.

Note
The event bits are not cleared by the use of this function.
Parameters
[in] wdog Pointer to WDOG peripheral register block.
Returns
Pending WDOG interrupt sources. Returns a set of interrupt flags OR-ed together for the interrupt sources set.

Definition at line 320 of file em_wdog.h .

__STATIC_INLINE uint32_t WDOGn_IntGetEnabled ( WDOG_TypeDef * wdog )

Get enabled and pending WDOG interrupt flags.

Useful for handling more interrupt sources in the same interrupt handler.

Parameters
[in] wdog Pointer to WDOG peripheral register block.
Returns
Pending and enabled WDOG interrupt sources. Returns a set of interrupt flags OR-ed together for the interrupt sources set.

Definition at line 339 of file em_wdog.h .

__STATIC_INLINE void WDOGn_IntSet ( WDOG_TypeDef * wdog,
uint32_t flags
)

Set one or more pending WDOG interrupts from SW.

Parameters
[in] wdog Pointer to WDOG peripheral register block.
[in] flags WDOG interrupt sources to set to pending. Use a set of interrupt flags (WDOG_IFS_nnn).

Definition at line 360 of file em_wdog.h .

__STATIC_INLINE bool WDOGn_IsEnabled ( WDOG_TypeDef * wdog )

Get enabled status of the watchdog.

Parameters
[in] wdog Pointer to WDOG peripheral register block.

Definition at line 377 of file em_wdog.h .

Referenced by WDOG_IsEnabled() .

__STATIC_INLINE bool WDOGn_IsLocked ( WDOG_TypeDef * wdog )

Get locked status of the watchdog.

Parameters
[in] wdog Pointer to WDOG peripheral register block.

Definition at line 393 of file em_wdog.h .

Referenced by WDOG_IsLocked() .

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.

Definition at line 285 of file em_wdog.c .

References BUS_RegBitWrite() .

Referenced by WDOG_Lock() , and WDOGn_Init() .

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.

Definition at line 308 of file em_wdog.c .

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.

Definition at line 332 of file em_wdog.c .