CLOCK driver

group nrfx_clock

CLOCK peripheral driver.

Typedefs

typedef void (*nrfx_clock_event_handler_t)(nrfx_clock_evt_type_t event)

Clock event handler.

Parameters

  • event – [in] Event.

Enums

enum nrfx_clock_evt_type_t

Clock events.

Values:

enumerator NRFX_CLOCK_EVT_HFCLK_STARTED

HFCLK has been started.

enumerator NRFX_CLOCK_EVT_LFCLK_STARTED

LFCLK has been started.

enumerator NRFX_CLOCK_EVT_CTTO

Calibration timeout.

enumerator NRFX_CLOCK_EVT_CAL_DONE

Calibration has been done.

enumerator NRFX_CLOCK_EVT_HFCLKAUDIO_STARTED

HFCLKAUDIO has been started.

enumerator NRFX_CLOCK_EVT_HFCLK192M_STARTED

HFCLK192M has been started.

Functions

nrfx_err_t nrfx_clock_init(nrfx_clock_event_handler_t event_handler)

Function for initializing internal structures in the nrfx_clock module.

After initialization, the module is in power off state (clocks are not started).

Parameters

  • event_handler – [in] Event handler provided by the user. Must not be NULL.

Returns NRFX_SUCCESS

The procedure is successful.

Returns NRFX_ERROR_ALREADY_INITIALIZED

The driver is already initialized.

void nrfx_clock_enable(void)

Function for enabling interrupts in the clock module.

void nrfx_clock_disable(void)

Function for disabling interrupts in the clock module.

void nrfx_clock_uninit(void)

Function for uninitializing the clock module.

void nrfx_clock_start(nrf_clock_domain_t domain)

Function for starting the specified clock domain.

Parameters

  • domain – [in] Clock domain.

void nrfx_clock_stop(nrf_clock_domain_t domain)

Function for stopping the specified clock domain.

Parameters

  • domain – [in] Clock domain.

NRFX_STATIC_INLINE bool nrfx_clock_is_running(nrf_clock_domain_t domain, void *p_clk_src)

Function for checking the specified clock domain state.

XTAL source is assumed for domains with multiple sources.

Parameters

  • domain – [in] Clock domain.

  • p_clk_src – [out] Pointer to a clock source that is running. Set to NULL if not needed. Ignored for HFCLKAUDIO domain. Variable pointed by p_clk_src must be of either nrf_clock_lfclk_t type for LFCLK or nrf_clock_hfclk_t type for HFCLK and HFCLK192M.

Returns true

The clock domain is running.

Returns false

The clock domain is not running.

NRFX_STATIC_INLINE void nrfx_clock_lfclk_start(void)

Function for starting the LFCLK.

Note

This function is deprecated. Use nrfx_clock_start instead.

NRFX_STATIC_INLINE void nrfx_clock_lfclk_stop(void)

Function for stopping the LFCLK.

Note

This function is deprecated. Use nrfx_clock_stop instead.

NRFX_STATIC_INLINE bool nrfx_clock_lfclk_is_running(void)

Function for checking the LFCLK state.

Note

This function is deprecated. Use nrfx_clock_is_running instead.

Returns true

The LFCLK is running.

Returns false

The LFCLK is not running.

NRFX_STATIC_INLINE void nrfx_clock_hfclk_start(void)

Function for starting the high-accuracy source HFCLK.

Note

This function is deprecated. Use nrfx_clock_start instead.

NRFX_STATIC_INLINE void nrfx_clock_hfclk_stop(void)

Function for stopping the external high-accuracy source HFCLK.

Note

This function is deprecated. Use nrfx_clock_stop instead.

NRFX_STATIC_INLINE bool nrfx_clock_hfclk_is_running(void)

Function for checking the HFCLK state.

Note

This function is deprecated. Use nrfx_clock_is_running instead.

Returns true

The HFCLK is running (XTAL source).

Returns false

The HFCLK is not running.

nrfx_err_t nrfx_clock_calibration_start(void)

Function for starting the calibration of internal LFCLK.

This function starts the calibration process. The process cannot be aborted. LFCLK and HFCLK must be running before this function is called.

Returns NRFX_SUCCESS

The procedure is successful.

Returns NRFX_ERROR_INVALID_STATE

The low-frequency of high-frequency clock is off.

Returns NRFX_ERROR_BUSY

Clock is in the calibration phase.

nrfx_err_t nrfx_clock_is_calibrating(void)

Function for checking if calibration is in progress.

This function indicates that the system is in calibration phase.

Returns NRFX_SUCCESS

The procedure is successful.

Returns NRFX_ERROR_BUSY

Clock is in the calibration phase.

void nrfx_clock_calibration_timer_start(uint8_t interval)

Function for starting calibration timer.

Parameters

  • interval – [in] Time after which the CTTO event and interrupt will be generated (in 0.25 s units).

void nrfx_clock_calibration_timer_stop(void)

Function for stopping the calibration timer.

NRFX_STATIC_INLINE uint32_t nrfx_clock_ppi_task_addr(nrf_clock_task_t task)

Function for returning a requested task address for the clock driver module.

Parameters

  • task – [in] One of the peripheral tasks.

Returns

Task address.

NRFX_STATIC_INLINE uint32_t nrfx_clock_ppi_event_addr(nrf_clock_event_t event)

Function for returning a requested event address for the clock driver module.

Parameters

  • event – [in] One of the peripheral events.

Returns

Event address.