SYSTICK HAL

Hardware access layer for accessing the SYSTICK peripheral. More...

Macros
#define	NRF_SYSTICK_VAL_MASK   SysTick_VAL_CURRENT_Msk
	Mask of usable bits in the SysTick value.

Enumerations
enum	nrf_systick_csr_flags_t {   NRF_SYSTICK_CSR_COUNTFLAG_MASK = SysTick_CTRL_COUNTFLAG_Msk,   NRF_SYSTICK_CSR_CLKSOURCE_MASK = SysTick_CTRL_CLKSOURCE_Msk,   NRF_SYSTICK_CSR_CLKSOURCE_REF = 0U << SysTick_CTRL_CLKSOURCE_Pos,   NRF_SYSTICK_CSR_CLKSOURCE_CPU = 1U << SysTick_CTRL_CLKSOURCE_Pos,   NRF_SYSTICK_CSR_TICKINT_MASK = SysTick_CTRL_TICKINT_Msk,   NRF_SYSTICK_CSR_TICKINT_ENABLE = 1U << SysTick_CTRL_TICKINT_Pos,   NRF_SYSTICK_CSR_TICKINT_DISABLE = 0U << SysTick_CTRL_TICKINT_Pos,   NRF_SYSTICK_CSR_ENABLE_MASK = SysTick_CTRL_ENABLE_Msk,   NRF_SYSTICK_CSR_ENABLE = 1U << SysTick_CTRL_ENABLE_Pos,   NRF_SYSTICK_CSR_DISABLE = 0U << SysTick_CTRL_ENABLE_Pos }
	Flags used by SysTick configuration. More...

Functions
__STATIC_INLINE uint32_t	nrf_systick_csr_get (void)
	Get Configuration and Status Register. More...
__STATIC_INLINE void	nrf_systick_csr_set (uint32_t val)
	Set Configuration and Status Register. More...
__STATIC_INLINE uint32_t	nrf_systick_load_get (void)
	Get the current reload value. More...
__STATIC_INLINE void	nrf_systick_load_set (uint32_t val)
	Configure the reload value. More...
__STATIC_INLINE uint32_t	nrf_systick_val_get (void)
	Read the SysTick current value. More...
__STATIC_INLINE void	nrf_systick_val_clear (void)
	Clear the SysTick current value. More...
__STATIC_INLINE uint32_t	nrf_systick_calib_get (void)
	Read the calibration register. More...

Detailed Description

Hardware access layer for accessing the SYSTICK peripheral.

SYSTICK is ARM peripheral, not Nordic design. It means that it has no Nordic-typical interface with Tasks and Events.

Its usage is limited here to implement simple delays. Also keep in mind that this timer would be stopped when CPU is sleeping (WFE/WFI instruction is successfully executed).

Enumeration Type Documentation

enum nrf_systick_csr_flags_t

Flags used by SysTick configuration.

See Also

nrf_systick_csr_set

nrf_systick_csr_get

Enumerator
NRF_SYSTICK_CSR_COUNTFLAG_MASK	Status flag: Returns 1 if timer counted to 0 since the last read of this register.
NRF_SYSTICK_CSR_CLKSOURCE_MASK	Configuration bit: Select the SysTick clock source.
NRF_SYSTICK_CSR_CLKSOURCE_REF	Configuration value: Select reference clock.
NRF_SYSTICK_CSR_CLKSOURCE_CPU	Configuration value: Select CPU clock.
NRF_SYSTICK_CSR_TICKINT_MASK	Configuration bit: Enables SysTick exception request.
NRF_SYSTICK_CSR_TICKINT_ENABLE	Configuration value: Counting down to zero does not assert the SysTick exception request.
NRF_SYSTICK_CSR_TICKINT_DISABLE	Configuration value: Counting down to zero to asserts the SysTick exception request.
NRF_SYSTICK_CSR_ENABLE_MASK	Configuration bit: Enable the SysTick timer.
NRF_SYSTICK_CSR_ENABLE	Configuration value: Counter enabled.
NRF_SYSTICK_CSR_DISABLE	Configuration value: Counter disabled.

Function Documentation

__STATIC_INLINE uint32_t nrf_systick_calib_get

(

void

)

Read the calibration register.

Returns

The calibration register value

__STATIC_INLINE uint32_t nrf_systick_csr_get

(

void

)

Get Configuration and Status Register.

Returns

Values composed by nrf_systick_csr_flags_t.

Note

The NRF_SYSTICK_CSR_COUNTFLAG_MASK value is cleared when CSR register is read.

__STATIC_INLINE void nrf_systick_csr_set

(

uint32_t

val

)

Set Configuration and Status Register.

Parameters

[in]

val

The value composed from nrf_systick_csr_flags_t.

__STATIC_INLINE uint32_t nrf_systick_load_get

(

void

)

Get the current reload value.

Returns

The reload register value.

__STATIC_INLINE void nrf_systick_load_set

(

uint32_t

val

)

Configure the reload value.

Parameters

[in]

val

The value to set in the reload register.

__STATIC_INLINE void nrf_systick_val_clear

(

void

)

Clear the SysTick current value.

Note

The SysTick does not allow setting current value. Any write to VAL register would clear the timer.

__STATIC_INLINE uint32_t nrf_systick_val_get

(

void

)

Read the SysTick current value.

Returns

The current SysTick value

See Also

NRF_SYSTICK_VAL_MASK