Implements the software Algorithm for Timer Handling in the Stack.

Modules
	Group_pal_common_hw_timer
	Implements a common api interface for accessing timer drivers of all architectures.

Data Structures
struct	timer_info_tag

Macros
#define	ADD_TIME(a, b) ((a) + (b))
	Adds two time values. More...

#define	HW_TIME_MASK (0xFFFF)

#define	MAX_NO_OF_TIMERS (25)

#define	MAX_TIMEOUT (0x7FFFFFFF)

#define	MIN_TIMEOUT (0x80)

#define	NO_TIMER (0xFF)

#define	SUB_TIME(a, b) ((a) - (b))
	Subtracts two time values. More...

#define	SYS_TIME_SHIFT_MASK (16)

#define	TOTAL_TIMERS TOTAL_NUMBER_OF_TIMERS

Typedefs
typedef enum sw_timeout_type_tag	sw_timeout_type_t
	Timeout type. More...

typedef void(*	timer_expiry_cb_t )(void *)

typedef struct timer_info_tag	timer_info_t

Enumerations
enum	sw_timeout_type_tag { SW_TIMEOUT_RELATIVE, SW_TIMEOUT_ABSOLUTE }
	Timeout type. More...

Functions
status_code_t	sw_timer_get_id (uint8_t *timer_id)
	Returns a timer id to be used before starting a timer. More...

uint32_t	sw_timer_get_residual_time (uint8_t timer_id)

uint32_t	sw_timer_get_time (void)
	Gets current time. More...

void	sw_timer_init (void)
	Initializes the Software Timer module. More...

bool	sw_timer_is_running (uint8_t timer_id)
	Checks whether a given timer is running or not. More...

uint32_t	sw_timer_next_timer_expiry_duration (void)

void	sw_timer_run_residual_time (uint32_t offset)

void	sw_timer_service (void)
	Handles Queues and Callbacks for Expired Timers. More...

status_code_t	sw_timer_start (uint8_t timer_id, uint32_t timer_count, sw_timeout_type_t timeout_type, FUNC_PTR timer_cb, void *param_cb)
	Starts a timer. More...

status_code_t	sw_timer_stop (uint8_t timer_id)
	Stops a running timer. More...

Variables
uint32_t	timer_info_tag::abs_exp_timer

bool	timer_info_tag::loaded

uint8_t	timer_info_tag::next_timer_in_queue

void *	timer_info_tag::param_cb

FUNC_PTR	timer_info_tag::timer_cb

#define ADD_TIME	(	a,
		b
	)	((a) + (b))

Adds two time values.

Referenced by sw_timer_start().

#define HW_TIME_MASK (0xFFFF)

Referenced by prog_ocr().

#define MAX_NO_OF_TIMERS (25)

#define MAX_TIMEOUT (0x7FFFFFFF)

Referenced by sw_timer_start().

#define MIN_TIMEOUT (0x80)

Referenced by sw_timer_start().

#define NO_TIMER (0xFF)

Referenced by internal_timer_handler(), load_hw_timer(), prog_ocr(), start_absolute_timer(), sw_timer_init(), sw_timer_next_timer_expiry_duration(), sw_timer_service(), and sw_timer_stop().

#define SUB_TIME	(	a,
		b
	)	((a) - (b))

Subtracts two time values.

Referenced by sw_timer_start().

#define SYS_TIME_SHIFT_MASK (16)

Referenced by prog_ocr().

#define TOTAL_TIMERS TOTAL_NUMBER_OF_TIMERS

typedef enum sw_timeout_type_tag sw_timeout_type_t

Timeout type.

typedef void(* timer_expiry_cb_t)(void *)

typedef struct timer_info_tag timer_info_t

enum sw_timeout_type_tag

Timeout type.

Enumerator
SW_TIMEOUT_RELATIVE	The timeout is relative to the current time.
SW_TIMEOUT_ABSOLUTE	The timeout is an absolute value.

status_code_t sw_timer_get_id ( uint8_t * timer_id )

Returns a timer id to be used before starting a timer.

Parameters

timer_id Value of the id returned by the function

References alloc_timer_id, ERR_NO_TIMER, STATUS_OK, and TOTAL_NUMBER_OF_SW_TIMERS.

uint32_t sw_timer_get_residual_time ( uint8_t timer_id )

References timer_info_tag::abs_exp_timer, and gettime().

Referenced by sw_timer_next_timer_expiry_duration().

uint32_t sw_timer_get_time ( void )

Gets current time.

This function returns the current time.

Parameters

[out] current_time Returns current system time

References gettime().

void sw_timer_init ( void )

Initializes the Software Timer module.

References alloc_timer_id, common_tc_init(), expired_timer_queue_head, expired_timer_queue_tail, hw_expiry_cb(), hw_overflow_cb(), timer_info_tag::next_timer_in_queue, NO_TIMER, running_timer_queue_head, running_timers, set_common_tc_expiry_callback(), set_common_tc_overflow_callback(), sys_time, timer_info_tag::timer_cb, timer_trigger, and TOTAL_NUMBER_OF_SW_TIMERS.

Referenced by main().

bool sw_timer_is_running ( uint8_t timer_id )

Checks whether a given timer is running or not.

Parameters

[out] True if the timer is running else False

uint32_t sw_timer_next_timer_expiry_duration ( void )

References NO_TIMER, running_timer_queue_head, and sw_timer_get_residual_time().

void sw_timer_run_residual_time ( uint32_t offset )

References FUNC_PTR, timer_info_tag::param_cb, running_timer_queue_head, STATUS_OK, SW_TIMEOUT_RELATIVE, sw_timer_start(), sw_timer_stop(), and timer_info_tag::timer_cb.

void sw_timer_service ( void )

Handles Queues and Callbacks for Expired Timers.

References cpu_irq_restore(), cpu_irq_save(), expired_timer_queue_head, expired_timer_queue_tail, internal_timer_handler(), timer_info_tag::loaded, NO_TIMER, timer_info_tag::param_cb, and timer_info_tag::timer_cb.

Referenced by hw_expiry_cb().

status_code_t sw_timer_start	(	uint8_t	timer_id,
		uint32_t	timer_count,
		sw_timeout_type_t	timeout_type,
		FUNC_PTR	timer_cb,
		void *	param_cb
	)

Starts a timer.

This function starts a regular timer and installs the corresponding callback function handle the timeout event.

Parameters

timer_id	Timer identifier
timer_count	Timeout in microseconds
timeout_type	TIMEOUT_RELATIVE or TIMEOUT_ABSOLUTE
timer_cb	Callback handler invoked upon timer expiry
param_cb	Argument for the callback handler