BURTCEMLIB

Detailed Description

Backup Real Time Counter (BURTC) Peripheral API.

This module contains functions to control the BURTC peripheral of Silicon Labs 32-bit MCUs. The Backup Real Time Counter allows timekeeping in all energy modes. The Backup RTC is also available when the system is in backup mode.

Data Structures

struct BURTC_Init_TypeDef

Macros

#define BURTC_INIT_DEFAULT
#define burtcClkDiv_1 1
#define burtcClkDiv_128 128
#define burtcClkDiv_16 16
#define burtcClkDiv_2 2
#define burtcClkDiv_32 32
#define burtcClkDiv_4 4
#define burtcClkDiv_64 64
#define burtcClkDiv_8 8

Enumerations

enum BURTC_ClkSel_TypeDef {
burtcClkSelULFRCO = BURTC_CTRL_CLKSEL_ULFRCO,
burtcClkSelLFRCO = BURTC_CTRL_CLKSEL_LFRCO,
burtcClkSelLFXO = BURTC_CTRL_CLKSEL_LFXO
}
enum BURTC_LP_TypeDef {
burtcLPDisable = BURTC_LPMODE_LPMODE_DISABLE,
burtcLPEnable = BURTC_LPMODE_LPMODE_ENABLE,
burtcLPBU = BURTC_LPMODE_LPMODE_BUEN
}
enum BURTC_Mode_TypeDef {
burtcModeDisable = BURTC_CTRL_MODE_DISABLE,
burtcModeEM2 = BURTC_CTRL_MODE_EM2EN,
burtcModeEM3 = BURTC_CTRL_MODE_EM3EN,
burtcModeEM4 = BURTC_CTRL_MODE_EM4EN
}

Functions

uint32_t BURTC_ClockFreqGet (void)
Get the clock frequency of the BURTC.
uint32_t BURTC_CompareGet (unsigned int comp)
Get the BURTC compare value.
void BURTC_CompareSet (unsigned int comp, uint32_t value)
Set BURTC compare channel.
__STATIC_INLINE uint32_t BURTC_CounterGet (void)
Get BURTC counter.
void BURTC_CounterReset (void)
Reset counter.
void BURTC_Enable (bool enable)
Enable or Disable BURTC peripheral reset and start counter.
__STATIC_INLINE void BURTC_FreezeEnable (bool enable)
Freeze register updates until enabled.
void BURTC_Init (const BURTC_Init_TypeDef *burtcInit)
Initialize BURTC.
__STATIC_INLINE void BURTC_IntClear (uint32_t flags)
Clear one or more pending BURTC interrupts.
__STATIC_INLINE void BURTC_IntDisable (uint32_t flags)
Disable one or more BURTC interrupts.
__STATIC_INLINE void BURTC_IntEnable (uint32_t flags)
Enable one or more BURTC interrupts.
__STATIC_INLINE uint32_t BURTC_IntGet (void)
Get pending BURTC interrupt flags.
__STATIC_INLINE uint32_t BURTC_IntGetEnabled (void)
Get enabled and pending BURTC interrupt flags.
__STATIC_INLINE void BURTC_IntSet (uint32_t flags)
Set one or more pending BURTC interrupts from SW.
__STATIC_INLINE void BURTC_Lock (void)
Lock BURTC registers, will protect from writing new config settings.
__STATIC_INLINE void BURTC_Powerdown (bool enable)
Shut down power to rentention register bank.
void BURTC_Reset (void)
Restore BURTC to reset state.
__STATIC_INLINE uint32_t BURTC_RetRegGet (uint32_t num)
Read a value from one of the retention registers.
__STATIC_INLINE void BURTC_RetRegSet (uint32_t num, uint32_t data)
Set a value in one of the retention registers.
__STATIC_INLINE uint32_t BURTC_Status (void)
Status of BURTC RAM, timestamp and LP Mode.
__STATIC_INLINE void BURTC_StatusClear (void)
Clear and reset BURTC status register.
__STATIC_INLINE void BURTC_SyncWait (void)
Wait for the BURTC to complete all synchronization of register changes and commands.
__STATIC_INLINE uint32_t BURTC_TimestampGet (void)
Get BURTC timestamp for entering BU.
__STATIC_INLINE void BURTC_Unlock (void)
Unlock BURTC registers, enable write access to change configuration.

Macro Definition Documentation

#define BURTC_INIT_DEFAULT
Value:
{ \
true, \
burtcModeEM2, \
false, \
burtcClkSelULFRCO, \
burtcClkDiv_1, \
0, \
true, \
false, \
burtcLPDisable, \
}

Default configuration for BURTC initialization structure.

Definition at line 131 of file em_burtc.h .

#define burtcClkDiv_1   1

BURTC clock divisors. These values are valid for the BURTC prescaler. Divide clock by 1.

Definition at line 61 of file em_burtc.h .

#define burtcClkDiv_128   128

Divide clock by 128.

Definition at line 68 of file em_burtc.h .

#define burtcClkDiv_16   16

Divide clock by 16.

Definition at line 65 of file em_burtc.h .

#define burtcClkDiv_2   2

Divide clock by 2.

Definition at line 62 of file em_burtc.h .

#define burtcClkDiv_32   32

Divide clock by 32.

Definition at line 66 of file em_burtc.h .

#define burtcClkDiv_4   4

Divide clock by 4.

Definition at line 63 of file em_burtc.h .

#define burtcClkDiv_64   64

Divide clock by 64.

Definition at line 67 of file em_burtc.h .

#define burtcClkDiv_8   8

Divide clock by 8.

Definition at line 64 of file em_burtc.h .

Enumeration Type Documentation

enum BURTC_ClkSel_TypeDef

BURTC clock selection.

Enumerator
burtcClkSelULFRCO

Ultra low frequency (1 kHz) clock.

burtcClkSelLFRCO

Low frequency RC oscillator.

burtcClkSelLFXO

Low frequency crystal osciallator.

Definition at line 76 of file em_burtc.h .

enum BURTC_LP_TypeDef

BURTC low power mode.

Enumerator
burtcLPDisable

Low Power Mode is disabled.

burtcLPEnable

Low Power Mode is always enabled.

burtcLPBU

Low Power Mode when system enters backup mode.

Definition at line 98 of file em_burtc.h .

enum BURTC_Mode_TypeDef

BURTC mode of operation.

Enumerator
burtcModeDisable

Disable BURTC

burtcModeEM2

Enable and start BURTC counter in EM0 to EM2.

burtcModeEM3

Enable and start BURTC counter in EM0 to EM3.

burtcModeEM4

Enable and start BURTC counter in EM0 to EM4.

Definition at line 86 of file em_burtc.h .

Function Documentation

uint32_t BURTC_ClockFreqGet ( void )

Get the clock frequency of the BURTC.

Returns
The current frequency in Hz.

Ultra-low frequency (1 kHz) clock.

Low-frequency RC oscillator.

Low-frequency crystal oscillator.

Definition at line 375 of file em_burtc.c .

References _BURTC_CTRL_CLKSEL_MASK , _BURTC_CTRL_PRESC_DIV1 , _BURTC_CTRL_PRESC_MASK , _BURTC_CTRL_PRESC_SHIFT , BURTC , BURTC_CTRL_CLKSEL_LFRCO , BURTC_CTRL_CLKSEL_LFXO , BURTC_CTRL_CLKSEL_ULFRCO , SystemLFRCOClockGet() , SystemLFXOClockGet() , and SystemULFRCOClockGet() .

uint32_t BURTC_CompareGet ( unsigned int comp )

Get the BURTC compare value.

Parameters
[in] comp Compare the channel index value, must be 0 for Giant/Leopard Gecko.
Returns
The currently configured value for this compare channel.

Definition at line 301 of file em_burtc.c .

References BURTC .

void BURTC_CompareSet ( unsigned int comp,
uint32_t value
)

Set BURTC compare channel.

Parameters
[in] comp Compare the channel index, must be 0 for current devices.
[in] value New compare value.

Definition at line 271 of file em_burtc.c .

References BURTC , and BURTC_SYNCBUSY_COMP0 .

__STATIC_INLINE uint32_t BURTC_CounterGet ( void )

Get BURTC counter.

Returns
BURTC counter value

Definition at line 373 of file em_burtc.h .

References BURTC .

void BURTC_Enable ( bool enable )

Enable or Disable BURTC peripheral reset and start counter.

Parameters
[in] enable If true; asserts reset to BURTC, halts counter, if false; deassert reset

Definition at line 253 of file em_burtc.c .

References _BURTC_CTRL_MODE_MASK , _BURTC_CTRL_RSTEN_SHIFT , BURTC , BURTC_CTRL_MODE_DISABLE , and BUS_RegBitWrite() .

Referenced by BURTC_Init() .

__STATIC_INLINE void BURTC_FreezeEnable ( bool enable )

Freeze register updates until enabled.

Parameters
[in] enable If true, registers are not updated until enabled again.

Definition at line 394 of file em_burtc.h .

References _BURTC_FREEZE_REGFREEZE_SHIFT , BURTC , and BUS_RegBitWrite() .

Referenced by BURTC_Init() .

void BURTC_Init ( const BURTC_Init_TypeDef * burtcInit )

Initialize BURTC.

Configures the BURTC peripheral.

Note
Before initialization, BURTC module must first be enabled by clearing the reset bit in the RMU, i.e., 
*   RMU_ResetControl(rmuResetBU, rmuResetModeClear);
*
Compare channel 0 must be configured outside this function, before initialization if enable is set to true. The counter will always be reset.
Parameters
[in] burtcInit A pointer to the BURTC initialization structure.

Definition at line 129 of file em_burtc.c .

References _BURTC_CTRL_BUMODETSEN_SHIFT , _BURTC_CTRL_COMP0TOP_SHIFT , _BURTC_CTRL_DEBUGRUN_SHIFT , _BURTC_CTRL_LPCOMP_SHIFT , _BURTC_CTRL_PRESC_SHIFT , BURTC , BURTC_CTRL_RSTEN , BURTC_Enable() , BURTC_FreezeEnable() , BURTC_IntClear() , BURTC_SYNCBUSY_LPMODE , BURTC_SyncWait() , burtcClkSelULFRCO , burtcLPDisable , burtcModeDisable , BURTC_Init_TypeDef::clkDiv , BURTC_Init_TypeDef::clkSel , BURTC_Init_TypeDef::compare0Top , BURTC_Init_TypeDef::debugRun , BURTC_Init_TypeDef::enable , BURTC_Init_TypeDef::lowPowerComp , BURTC_Init_TypeDef::lowPowerMode , BURTC_Init_TypeDef::mode , and BURTC_Init_TypeDef::timeStamp .

__STATIC_INLINE void BURTC_IntClear ( uint32_t flags )

Clear one or more pending BURTC interrupts.

Parameters
[in] flags BURTC interrupt sources to clear. Use a set of interrupt flags OR-ed together to clear multiple interrupt sources for the BURTC module (BURTC_IFS_nnn).

Definition at line 180 of file em_burtc.h .

References BURTC .

Referenced by BURTC_Init() .

__STATIC_INLINE void BURTC_IntDisable ( uint32_t flags )

Disable one or more BURTC interrupts.

Parameters
[in] flags BURTC interrupt sources to disable. Use a set of interrupt flags OR-ed together to disable multiple interrupt sources for the BURTC module (BURTC_IFS_nnn).

Definition at line 198 of file em_burtc.h .

References BURTC .

__STATIC_INLINE void BURTC_IntEnable ( uint32_t flags )

Enable one or more BURTC interrupts.

Note
Depending on use, a pending interrupt may already be set prior to enabling the interrupt. Consider using BURTC_IntClear() prior to enabling if a pending interrupt should be ignored.
Parameters
[in] flags BURTC interrupt sources to enable. Use a set of interrupt flags OR-ed together to set multiple interrupt sources for the BURTC module (BURTC_IFS_nnn).

Definition at line 221 of file em_burtc.h .

References BURTC .

__STATIC_INLINE uint32_t BURTC_IntGet ( void )

Get pending BURTC interrupt flags.

Note
This function does not clear the event bits.
Returns
Pending BURTC interrupt sources. Returns a set of interrupt flags OR-ed together for multiple interrupt sources in the BURTC module (BURTC_IFS_nnn).

Definition at line 241 of file em_burtc.h .

References BURTC .

__STATIC_INLINE uint32_t BURTC_IntGetEnabled ( void )

Get enabled and pending BURTC interrupt flags.

Note
The event bits are not cleared by the use of this function.
Returns
Pending BURTC interrupt sources that is also enabled. Returns a set of interrupt flags OR-ed together for multiple interrupt sources in the BURTC module (BURTC_IFS_nnn).

Definition at line 258 of file em_burtc.h .

References BURTC .

__STATIC_INLINE void BURTC_IntSet ( uint32_t flags )

Set one or more pending BURTC interrupts from SW.

Parameters
[in] flags BURTC interrupt sources to set to pending. Use a set of interrupt flags OR-ed together to set multiple interrupt sources for the BURTC module (BURTC_IFS_nnn).

Definition at line 278 of file em_burtc.h .

References BURTC .

__STATIC_INLINE void BURTC_Powerdown ( bool enable )

Shut down power to rentention register bank.

Parameters
[in] enable If true, shuts off power to retention registers.
Note
When power rentention is disabled, it cannot be enabled again (until reset).

Definition at line 407 of file em_burtc.h .

References _BURTC_POWERDOWN_RAM_SHIFT , BURTC , and BUS_RegBitWrite() .

void BURTC_Reset ( void )

Restore BURTC to reset state.

Note
Before accessing the BURTC, BURSTEN in RMU->CTRL must be cleared. LOCK will not be reset to default value, as this will disable access to core BURTC registers.

Definition at line 337 of file em_burtc.c .

References _BURTC_IEN_RESETVALUE , _BURTC_IF_MASK , _RMU_CTRL_BURSTEN_SHIFT , BURTC , BURTC_SyncWait() , BUS_RegBitRead() , BUS_RegBitWrite() , and RMU .

__STATIC_INLINE uint32_t BURTC_RetRegGet ( uint32_t num )

Read a value from one of the retention registers.

Parameters
[in] num Retention Register to read

Definition at line 435 of file em_burtc.h .

References BURTC .

__STATIC_INLINE void BURTC_RetRegSet ( uint32_t num,
uint32_t data
)

Set a value in one of the retention registers.

Parameters
[in] num Register to set
[in] data Value to put into register

Definition at line 421 of file em_burtc.h .

References BURTC .

__STATIC_INLINE uint32_t BURTC_Status ( void )

Status of BURTC RAM, timestamp and LP Mode.

Returns
A mask logially OR-ed status bits

Definition at line 293 of file em_burtc.h .

References BURTC .

__STATIC_INLINE uint32_t BURTC_TimestampGet ( void )

Get BURTC timestamp for entering BU.

Returns
BURTC Time Stamp value

Definition at line 385 of file em_burtc.h .

References BURTC .