User single-shot or periodic timer. More...

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

Inheritance diagram for os::rtos::timer:

Classes
class	attributes
	Timer attributes. More...

class	attributes_periodic
	Periodic timer attributes. More...

struct	run
	Timer run types. More...

struct	state
	Timer states. More...

Public Types
using	func_args_t = void *
	Timer call back function arguments.

using	func_t = void(*)(func_args_t args)
	Entry point of a timer call back function.

using	state_t = uint8_t
	Type of of variables holding timer states.

using	type_t = uint8_t
	Type of of variables holding timer run types.

Public Member Functions
Constructors & Destructor
	timer (func_t function, func_args_t args, const attributes &attr=once_initializer)
	Construct a timer object instance.

	timer (const char *name, func_t function, func_args_t args, const attributes &attr=once_initializer)
	Construct a named timer object instance.

	~timer ()
	Destruct the timer object instance.

Operators
bool	operator== (const timer &rhs) const
	Compare timers.

Public Member Functions
result_t	start (clock::duration_t period)
	Start or restart the timer.

result_t	stop (void)
	Stop the timer.

Public Member Functions
const char *	name (void) const
	Get object name.

Static Public Member Functions
Operators
static void *	operator new (std::size_t bytes)
	Allocate space for a new object instance using the RTOS system allocator.

static void *	operator new (std::size_t bytes, void *ptr)
	Emplace a new object instance.

static void *	operator new[] (std::size_t bytes)
	Allocate space for an array of new object instances using the RTOS system allocator.

static void *	operator new[] (std::size_t bytes, void *ptr)
	Emplace an array of new object instances.

static void	operator delete (void *ptr, std::size_t bytes)
	Deallocate the dynamically allocated object instance. using the RTOS system allocator.

static void	operator delete[] (void *ptr, std::size_t bytes)
	Deallocate the dynamically allocated array of object. instances using the RTOS system allocator.

Static Public Attributes
static const attributes	once_initializer
	Default one shot timer initialiser.

static const attributes_periodic	periodic_initializer
	Default periodic timer initialiser.

Detailed Description

User single-shot or periodic timer.

The CMISIS++ timer schedules the execution of a user function after a programmable interval. If the timer is periodic, the function is rescheduled automatically until the timer is stopped.

Example

#include <cmsis-plus/rtos/os.h>
#include <cstdlib>
 
using namespace os::rtos;
 
// Thread function.
void
func(void* args)
{
  // Do something.
  ...
}
 
int
os_main(int argc, char* argv[])
{
  // Construct new thread, with function and no arguments.
  timer tm { func, nullptr };
 
  // Schedule func() to be executed after 100 ticks.
  tm.start(100);
 
  // Do something.
 
  return 0;
}

POSIX compatibility: No POSIX similar functionality identified.

Definition at line 64 of file os-timer.h.

Constructor & Destructor Documentation

◆ timer() [1/2]

os::rtos::timer::timer	(	func_t	function,
		func_args_t	args,
		const attributes &	attr = `once_initializer`
	)

Construct a timer object instance.

Parameters

[in]	function	Pointer to timer function.
[in]	args	Pointer to timer function arguments.
[in]	attr	Reference to attributes.

This constructor shall initialise a timer object with attributes referenced by attr. If the attributes specified by attr are modified later, the timer attributes shall not be affected.

Upon successful initialisation, the state of the timer object shall become initialised.

Only the timer object itself may be used for running the function. It is not allowed to make copies of timer objects.

In cases where default condition variable attributes are appropriate, the variables timer::once_initializer or timer::periodic_initializer can be used to initialise timers. The effect shall be equivalent to creating a timer object with the simple constructor.

If the attr attributes are modified after the timer creation, the timer attributes shall not be affected.

Warning: Cannot be invoked from Interrupt Service Routines.

Definition at line 150 of file os-timer.cpp.

◆ timer() [2/2]

os::rtos::timer::timer	(	const char *	name,
		func_t	function,
		func_args_t	args,
		const attributes &	attr = `once_initializer`
	)

Construct a named timer object instance.

Parameters

[in]	name	Pointer to name.
[in]	function	Pointer to timer function.
[in]	args	Pointer to timer function arguments.
[in]	attr	Reference to attributes.

This constructor shall initialise a named timer object with attributes referenced by attr. If the attributes specified by attr are modified later, the timer attributes shall not be affected.

Upon successful initialisation, the state of the timer object shall become initialised.

Only the timer object itself may be used for running the function. It is not allowed to make copies of timer objects.

In cases where default condition variable attributes are appropriate, the variables timer::once_initializer or timer::periodic_initializer can be used to initialise timers. The effect shall be equivalent to creating a timer object with the simple constructor.

If the attr attributes are modified after the timer creation, the timer attributes shall not be affected.

Warning: Cannot be invoked from Interrupt Service Routines.

Definition at line 183 of file os-timer.cpp.

◆ ~timer()

os::rtos::timer::~timer ( )

Destruct the timer object instance.

This destructor shall destroy the timer object; the object becomes, in effect, uninitialised. An implementation may cause the destructor to set the object to an invalid value.

If the timer is running, it must be automatically stopped.

Warning: Cannot be invoked from Interrupt Service Routines.

Definition at line 227 of file os-timer.cpp.

Member Function Documentation

◆ 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.

◆ operator delete()

void os::rtos::internal::object_named_system::operator delete	(	void *	ptr,
		std::size_t	bytes
	)

inlinestaticinherited

Deallocate the dynamically allocated object instance. using the RTOS system allocator.

Parameters

ptr	Pointer to object.
bytes	Number of bytes to deallocate.

Returns: Nothing.

The deallocation function (3.7.4.2) called by a delete-expression to render the value of ptr invalid.

ptr shall be a null pointer or its value shall be a value returned by an earlier call to the (possibly replaced) operator new() which has not been invalidated by an intervening call to operator delete(void*).

If ptr is null, does nothing. Otherwise, reclaims the storage allocated by the earlier call to operator new.

The storage is deallocated using the RTOS system allocator.

Warning: Cannot be invoked from Interrupt Service Routines.

Definition at line 137 of file os-inlines.h.

◆ operator delete[]()

void os::rtos::internal::object_named_system::operator delete[]	(	void *	ptr,
		std::size_t	bytes
	)

inlinestaticinherited

Deallocate the dynamically allocated array of object. instances using the RTOS system allocator.

Parameters

ptr	Pointer to array of objects.
bytes	Number of bytes to deallocate.

Returns: Nothing.

The deallocation function (3.7.4.2) called by the array form of a delete-expression to render the value of ptr invalid.

If ptr is null, does nothing. Otherwise, reclaims the storage allocated by the earlier call to operator new.

The storage is deallocated using the RTOS system allocator.

Warning: Cannot be invoked from Interrupt Service Routines.

Definition at line 158 of file os-inlines.h.

◆ operator new() [1/2]

void * os::rtos::internal::object_named_system::operator new ( std::size_t bytes )

inlinestaticinherited

Allocate space for a new object instance using the RTOS system allocator.

Parameters

bytes Number of bytes to allocate.

Returns: Pointer to allocated object.

The allocation function (3.7.4.1) called by a new-expression (5.3.4) to allocate a storage of size bytes suitably aligned to represent any object of that size. Return a non-null pointer to suitably aligned storage (3.7.4).

The storage is allocated using the RTOS system allocator.

Warning: Cannot be invoked from Interrupt Service Routines.

Definition at line 59 of file os-inlines.h.

◆ operator new() [2/2]

void * os::rtos::internal::object_named_system::operator new	(	std::size_t	bytes,
		void *	ptr
	)

inlinestaticinherited

Emplace a new object instance.

Parameters

bytes	Number of bytes to emplace.
ptr	Pointer to location to emplace the object.

Returns: Pointer to emplaced object.

The allocation function (3.7.4.1) called by a placement new-expression to allocate a storage of size bytes suitably aligned to represent any object of that size. Return a non-null pointer to suitably aligned storage (3.7.4).

The storage is allocated using the RTOS system allocator.

Warning: Cannot be invoked from Interrupt Service Routines.

Definition at line 96 of file os-inlines.h.

◆ operator new[]() [1/2]

void * os::rtos::internal::object_named_system::operator new[] ( std::size_t bytes )

inlinestaticinherited

Allocate space for an array of new object instances using the RTOS system allocator.

Parameters

bytes Number of bytes to allocate.

Returns: Pointer to allocated array.

The allocation function (3.7.4.1) called by the array form of a new-expression (5.3.4) to allocate a storage of size bytes suitably aligned to represent any array object of that size or smaller.

The storage is allocated using the RTOS system allocator.

Warning: Cannot be invoked from Interrupt Service Routines.

Definition at line 77 of file os-inlines.h.

◆ operator new[]() [2/2]

void * os::rtos::internal::object_named_system::operator new[]	(	std::size_t	bytes,
		void *	ptr
	)

inlinestaticinherited

Emplace an array of new object instances.

Parameters

bytes	Number of bytes to emplace.
ptr	Pointer to location to emplace the object.

Returns: Pointer to emplaced array.

The allocation function (3.7.4.1) called by the array form of a placement new-expression to allocate a storage of size bytes suitably aligned to represent any array object of that size or smaller.

The storage is allocated using the RTOS system allocator.

Warning: Cannot be invoked from Interrupt Service Routines.

Definition at line 113 of file os-inlines.h.

◆ operator==()

bool os::rtos::timer::operator== ( const timer & rhs ) const

inline

Compare timers.

Return values

true	The given timer is the same as this timer.
false	The timers are different.

Identical timers should have the same memory address.

Definition at line 499 of file os-timer.h.

◆ start()

result_t os::rtos::timer::start ( clock::duration_t period )

Start or restart the timer.

Parameters

[in] period Timer period, in clock units (ticks or seconds).

Return values

result::ok	The timer has been started or restarted.
ENOTRECOVERABLE	Timer could not be started.
EPERM	Cannot be invoked from an Interrupt Service Routines.

If the period is 0, it is automatically adjusted to 1.

Warning: Cannot be invoked from Interrupt Service Routines.

Definition at line 261 of file os-timer.cpp.

◆ stop()

result_t os::rtos::timer::stop ( void )

Stop the timer.

Parameters: None.

Return values

result::ok	The timer has been stopped.
EPERM	Cannot be invoked from an Interrupt Service Routines.
EAGAIN	The timer is not yet started.
ENOTRECOVERABLE	Timer could not be stopped.

Remove the timer from the clock schedule list, so that the next execution of the function is cancelled.

A stopped timer can be restarted later with start()`.

Warning: Cannot be invoked from Interrupt Service Routines.

Definition at line 319 of file os-timer.cpp.

Member Data Documentation

◆ once_initializer

const timer::attributes os::rtos::timer::once_initializer

static

Default one shot timer initialiser.

This variable can be used to create a single run timer.

Definition at line 216 of file os-timer.h.

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

Classes

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes

Detailed Description

Constructor & Destructor Documentation

◆ timer() [1/2]

◆ timer() [2/2]

◆ ~timer()

Member Function Documentation

◆ name()

◆ operator delete()

◆ operator delete[]()

◆ operator new() [1/2]

◆ operator new() [2/2]

◆ operator new[]() [1/2]

◆ operator new[]() [2/2]

◆ operator==()

◆ start()

◆ stop()

Member Data Documentation

◆ once_initializer