RTC - Real Time Counter#

RTC_CompareGet#

uint32_t RTC_CompareGet (unsigned int comp)

Get the RTC compare register value.

Returns

• A compare register value, 0 if invalid register selected.

RTC_CompareSet#

void RTC_CompareSet (unsigned int comp, uint32_t value)

Set the RTC compare register value.

Note

• The setting of a compare register requires synchronization into the low-frequency domain. If the same register is modified before a previous update has completed, this function will stall until the previous synchronization has completed. This only applies to the Gecko Family. See comments in the regSync() internal function call.

RTC_CounterGet#

uint32_t RTC_CounterGet (void )

Get RTC counter value.

Returns

• Current RTC counter value.

RTC_CounterReset#

void RTC_CounterReset (void )

Restart the RTC counter from zero.

RTC_Enable#

void RTC_Enable (bool enable)

Enable/disable RTC.

Note

• The enabling/disabling of RTC modifies the RTC 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. This only applies to the Gecko Family. See comments in the regSync() internal function call.

RTC_FreezeEnable#

void RTC_FreezeEnable (bool enable)

RTC register synchronization freeze control.

Some RTC registers require synchronization into the low-frequency (LF) domain. The freeze feature allows for several registers to be modified before passing them to the LF domain simultaneously (which takes place when the freeze mode is disabled).

Note

• When enabling freeze mode, this function will wait for all current ongoing RTC synchronization to LF domain to complete (normally synchronization will not be in progress.) However, for this reason, when using freeze mode, modifications of registers requiring LF synchronization should be done within one freeze enable/disable block to avoid unnecessary stalling. This only applies to the Gecko Family. See the reference manual chapter about Access to Low Energy Peripherals (Asynchronos Registers) for details.

RTC_Init#

void RTC_Init (const RTC_Init_TypeDef * init)

Initialize RTC.

Note that the compare values must be set separately with RTC_CompareSet() prior to the use of this function if configuring the RTC to start when initialization is completed.

Note

• The initialization of the RTC modifies the RTC 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. This only applies to the Gecko Family. See comments in the regSync() internal function call.

RTC_IntClear#

void RTC_IntClear (uint32_t flags)

Clear one or more pending RTC interrupts.

RTC_IntDisable#

void RTC_IntDisable (uint32_t flags)

Disable one or more RTC interrupts.

RTC_IntEnable#

void RTC_IntEnable (uint32_t flags)

Enable one or more RTC 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 RTC_IntClear() prior to enabling the interrupt.

RTC_IntGet#

uint32_t RTC_IntGet (void )

Get pending RTC interrupt flags.

Note

• Event bits are not cleared by using this function.

Returns

• Pending RTC interrupt sources. Returns a set of interrupt flags OR-ed together for multiple interrupt sources in the RTC module (RTC_IFS_nnn).

RTC_IntGetEnabled#

uint32_t RTC_IntGetEnabled (void )

Get enabled and pending RTC interrupt flags.

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

Note

• Interrupt flags are not cleared by using this function.

Returns

• Pending and enabled RTC interrupt sources. The return value is the bitwise AND of

  • the enabled interrupt sources in RTC_IEN and

  • the pending interrupt flags RTC_IF.

RTC_IntSet#

void RTC_IntSet (uint32_t flags)

Set one or more pending RTC interrupts from SW.

RTC_Reset#

void RTC_Reset (void )

Restore RTC to reset state.

NUM_RTC_CHANNELS#

#define NUM_RTC_CHANNELS

2U

The RTC peripheral on series 0 devices support 2 compare channels while the RTC peripheral on series 1 devices support 6 compare channels.

RTC_INIT_DEFAULT#

#define RTC_INIT_DEFAULT

Suggested default configuration for RTC initialization structure.