os::rtos::clock_highres Class Reference

High Resolution derived clock. More...

#include <cmsis-plus/rtos/os.h>

Inheritance diagram for os::rtos::clock_highres:

Public Types
Types & Constants
using	duration_t = port::clock::duration_t
	Type of variables holding clock durations.
using	timestamp_t = port::clock::timestamp_t
	Type of variables holding clock time stamps.
using	offset_t = port::clock::offset_t
	Type of variables holding clock offsets.

Public Member Functions
Constructors & Destructor
	clock_highres ()
	Construct a SysTick clock object instance.
virtual	~clock_highres () override
	Destruct the SysTick clock object instance.
Public Member Functions
virtual void	start (void) override
virtual timestamp_t	now (void) override
	Tell the current time.
uint32_t	input_clock_frequency_hz (void)
void	internal_increment_count (void)
Public Member Functions
timestamp_t	steady_now (void)
	Tell the current time since startup.
result_t	sleep_for (duration_t duration)
	Sleep for a relative duration.
virtual result_t	sleep_until (timestamp_t timestamp)
	Sleep until an absolute timestamp.
result_t	wait_for (duration_t timeout)
	Timed wait for an event.
timestamp_t	update_for_slept_time (duration_t duration)
	Increase the internal count after a deep sleep.
Public Member Functions
const char *	name (void) const
	Get object name.

Detailed Description

High Resolution derived clock.

Definition at line 713 of file os-clocks.h.

Constructor & Destructor Documentation

clock_highres()

os::rtos::clock_highres::clock_highres

(

)

Construct a SysTick clock object instance.

Warning

Cannot be invoked from Interrupt Service Routines.

Definition at line 706 of file os-clocks.cpp.

~clock_highres()

os::rtos::clock_highres::~clock_highres ( )

overridevirtual

Destruct the SysTick clock object instance.

Warning

Cannot be invoked from Interrupt Service Routines.

Definition at line 716 of file os-clocks.cpp.

Member Function Documentation

input_clock_frequency_hz()

uint32_t os::rtos::clock_highres::input_clock_frequency_hz ( void  )

inline

Definition at line 934 of file os-clocks.h.

internal_increment_count()

void os::rtos::clock_highres::internal_increment_count ( void  )

inline

Definition at line 921 of file os-clocks.h.

name()

const char * os::rtos::internal::object_named::name ( void  ) const

inlineinherited

Get object name.

Parameters

None.

Returns

A null terminated string.

All objects return a non-null string; anonymous objects return "-".

Note

Can be invoked from Interrupt Service Routines.

Definition at line 774 of file os-decls.h.

now()

clock::timestamp_t os::rtos::clock_highres::now ( void  )

overridevirtual

Tell the current time.

Parameters

None.

Returns

The number of SysTick input clocks since startup.

Reimplemented from os::rtos::clock.

Definition at line 735 of file os-clocks.cpp.

sleep_for()

result_t os::rtos::clock::sleep_for ( duration_t  duration )

inherited

Sleep for a relative duration.

Parameters

[in]

duration

The number of clock units (ticks or seconds) to sleep.

Return values

ETIMEDOUT	The sleep lasted the entire duration.
EPERM	Cannot be invoked from an Interrupt Service Routines.
EINTR	The sleep was interrupted.

Warning

Cannot be invoked from Interrupt Service Routines.

Definition at line 201 of file os-clocks.cpp.

sleep_until()

result_t os::rtos::clock::sleep_until ( timestamp_t  timestamp )

virtualinherited

Sleep until an absolute timestamp.

Parameters

[in]

timestamp

The absolute moment in time, in clock units.

Return values

ETIMEDOUT	The sleep lasted the entire duration.
EPERM	Cannot be invoked from an Interrupt Service Routines.
EINTR	The sleep was interrupted.

Warning

Cannot be invoked from Interrupt Service Routines.

Reimplemented in os::rtos::adjustable_clock.

Definition at line 243 of file os-clocks.cpp.

start()

void os::rtos::clock_highres::start ( void  )

overridevirtual

Warning

Cannot be invoked from Interrupt Service Routines.

Implements os::rtos::clock.

Definition at line 725 of file os-clocks.cpp.

steady_now()

clock::timestamp_t os::rtos::clock::steady_now ( void  )

inherited

Tell the current time since startup.

Parameters

None.

Returns

The clock current steady timestamp (time units from startup).

Note

Can be invoked from Interrupt Service Routines.

Definition at line 187 of file os-clocks.cpp.

update_for_slept_time()

clock::timestamp_t os::rtos::clock::update_for_slept_time ( duration_t  duration )

inherited

Increase the internal count after a deep sleep.

Parameters

duration

Number of ticks lost during sleep.

Returns

The clock current steady timestamp (time units from startup).

During deep sleep the interrupts used to count clock ticks are usually disabled and an external RTC is configured to wake-up the device, so a number of clock ticks are lost.

To keep the clocks accurate, it is recommended to sample the external RTC before entering deep sleep and again when the device is back to life, compute the time slept as difference, and use this function to update the internal clock counter.

Definition at line 324 of file os-clocks.cpp.

wait_for()

result_t os::rtos::clock::wait_for ( duration_t  timeout )

inherited

Timed wait for an event.

Parameters

[in]

timeout

The timeout in clock units.

Return values

result::ok	An event occurred before the timeout.
ETIMEDOUT	The wait lasted the entire duration.
EPERM	Cannot be invoked from an Interrupt Service Routines.
EINTR	The sleep was interrupted.

Warning

Cannot be invoked from Interrupt Service Routines.

Definition at line 282 of file os-clocks.cpp.

---

The documentation for this class was generated from the following files:

• os-clocks.h
• os-clocks.cpp