Gptp

Introduction

Files
file	gptpbasetypes.h
	File contains base datatypes used, as per IEEE 802.1AS Standard Documentation.
file	gptpmasterclock.h
	file contains gptp master clock related functions.

Data Structures
struct	PortIdentity
	The portIdentity identifies a port of a time-aware system. More...
struct	ClockQuality
	The clock quality represents quality of clock. More...
struct	UInteger48
	48bit variable, lsb is 32 bits More...
struct	UInteger48m32
	48bit variable, msb is 32 bits More...
struct	UInteger112
	UInteger112 (802.1AS, 10.3.2 systemIdentity) More...
struct	UInteger224
	UInteger224 (802.1AS, 10.3.4 time-synchronization spanning tree priority vectors ) More...
struct	ScaledNs
	The ScaledNs type represents signed values of time and time interval in units of 2e-16 ns. More...
struct	UScaledNs
	The ScaledNs type represents unsigned values of time and time interval in units of 2^-16 ns. More...
struct	TimeInterval
struct	Timestamp
	The Timestamp type represents a positive time with respect to the epoch. More...
struct	ExtendedTimestamp
	802.1AS-rev ExtendedTimestamp More...

Functions
int	gptpmasterclock_init (const char *shmem_name)
	initialize to get gptp clock from tsn_gptp daemon. if previously initialized, it will simply return 0. More...
int	gptpmasterclock_close (void)
	close gptpmasterclcock More...
int	gptpmasterclock_gm_domainIndex (void)
	return the domainIndex which is currently used as systeme wide gptp clock. More...
int64_t	gptpmasterclock_getts64 (void)
	get 64-bit nsec unit ts of system wide gptp clock More...
int	gptpmasterclock_wait_until_ts64 (int64_t tts, int64_t vclose, int64_t toofar)
	Wait until tts comes. More...
uint64_t	gptpmasterclock_expand_timestamp (uint32_t timestamp)
	expand 32-bit nsec time to 64 bit with aligning to gptp clock. More...
uint64_t	gptpmasterclock_expand_timestamp_ts64 (uint32_t timestamp, int64_t ts64)
	expand 32-bit nsec time to 64 bit with aligning to gptp clock at the time ts64. More...
int	gptpmasterclock_gmchange_ind (void)
	get GM change indicator, the number is incremented whenever GM is changed More...
int	gptpmasterclock_get_max_domains (void)
	get maximum number of domains More...
int	gptpmasterclock_get_domain_ts64 (int64_t *ts64, int domainIndex)
	get a synchronized clock value on specific domain More...
void	gptpmasterclock_dump_offset (void)
	print phase offset for all domains More...

Typedefs
typedef uint8_t	ClockIdentity[CLOCK_IDENTITY_LENGTH]
typedef uint8_t	Nibble
	Primitive data types specifications for IEEE 802.1AS. All non-primitive data types are derived from the primitive types, signed integers are represented as two's complement form. More...
typedef uint8_t	Octet
typedef uint8_t	Octet2[2]
typedef uint8_t	Octet3[3]
typedef uint8_t	Octet4[4]
typedef uint8_t	Enumeration2
typedef uint8_t	Enumeration4
typedef uint8_t	Enumeration8
typedef uint16_t	Enumeration16
typedef uint32_t	Enumeration24
typedef uint8_t	UInteger4

Enumerations
enum	TimeSource {   ATOMIC_CLOCK = 0x10, GPS = 0x20, TERRESTRIAL_RADIO = 0x30, PTP = 0x40,   NTP = 0x50, HAND_SET = 0x60, OTHER = 0x90, INTERNAL_OSCILLATOR = 0xA0 }
	the type of source of time used by a ClockMaster(802.1AS, 8.6.2.7 timeSource) More...
enum	PTPPortState { DisabledPort = 3, MasterPort = 6, PassivePort = 7, SlavePort = 9 }
	value of the port state (802.1AS 14.8.3 portState) More...
enum	gmsync_status_t { GMSYNC_UNSYNC =0, GMSYNC_SYNC, GMSYNC_SYNC_STABLE }

Macros
#define	MAX_PATH_TRACE_N   179
	Macro to define maximum path trace. More...
#define	CLOCK_IDENTITY_LENGTH   8
	Macro which defines Clock Identity Length. More...
#define	SCALEDNS_FACTOR   0x10000
#define	VALUE_DISABLED   0u
#define	VALUE_ENABLED   1u

Macro Definition Documentation

MAX_PATH_TRACE_N

#define MAX_PATH_TRACE_N   179

Macro to define maximum path trace.

Note

The maximum possible number is 179 based on specification we can set the maximum here and restrict the frame using MAX_PTP_PACKET instead

#define MAX_PATH_TRACE_N 179

See also

10.3.8.23 pathTrace

CLOCK_IDENTITY_LENGTH

#define CLOCK_IDENTITY_LENGTH   8

Macro which defines Clock Identity Length.

SCALEDNS_FACTOR

#define SCALEDNS_FACTOR   0x10000

VALUE_DISABLED

#define VALUE_DISABLED   0u

VALUE_ENABLED

#define VALUE_ENABLED   1u

Typedef Documentation

ClockIdentity

typedef uint8_t ClockIdentity[CLOCK_IDENTITY_LENGTH]

Nibble

typedef uint8_t Nibble

Primitive data types specifications for IEEE 802.1AS. All non-primitive data types are derived from the primitive types, signed integers are represented as two's complement form.

See the following Table

Data Types	Definition
EnumerationN	N-bit enumerated value
UIntegerN	N-bit unsigned integer
Nibble	4-bit field not interpreted as a number
Octet	8-bit field not interpreted as a number
OctetN	N-octet fiels not interpreted as a number
Double	Double precision (64-bit) floating-point vlaue

Octet

typedef uint8_t Octet

Octet2

typedef uint8_t Octet2[2]

Octet3

typedef uint8_t Octet3[3]

Octet4

typedef uint8_t Octet4[4]

Enumeration2

typedef uint8_t Enumeration2

Enumeration4

typedef uint8_t Enumeration4

Enumeration8

typedef uint8_t Enumeration8

Enumeration16

typedef uint16_t Enumeration16

Enumeration24

typedef uint32_t Enumeration24

UInteger4

typedef uint8_t UInteger4

Enumeration Type Documentation

TimeSource

enum TimeSource

the type of source of time used by a ClockMaster(802.1AS, 8.6.2.7 timeSource)

Enumerator
ATOMIC_CLOCK
GPS
TERRESTRIAL_RADIO
PTP
NTP
HAND_SET
OTHER
INTERNAL_OSCILLATOR

PTPPortState

enum PTPPortState

value of the port state (802.1AS 14.8.3 portState)

Note

IEEE1588-2019, initializing=1, faulty=2, disabled=3, listening=4, pre-master=5, master=6, passive=7, uncalibrated=8, slave=9

Enumerator
DisabledPort
MasterPort
PassivePort
SlavePort

gmsync_status_t

enum gmsync_status_t

Enumerator
GMSYNC_UNSYNC
GMSYNC_SYNC
GMSYNC_SYNC_STABLE

Function Documentation

gptpmasterclock_init()

int gptpmasterclock_init

(

const char *

shmem_name

)

initialize to get gptp clock from tsn_gptp daemon. if previously initialized, it will simply return 0.

Parameters

shmem_name

shared memory node name. set NULL to use the default

Returns

-1 on error, 0 on Successful initialization.

Note

argument 'shmem_name' will not be used in platforms that recommends against using shared memory (e.g GHS INTEGRITY). Pass NULL is such case.

gptpmasterclock_close()

int gptpmasterclock_close

(

void

)

close gptpmasterclcock

Returns

-1: on error, 0:on successfull

gptpmasterclock_gm_domainIndex()

int gptpmasterclock_gm_domainIndex

(

void

)

return the domainIndex which is currently used as systeme wide gptp clock.

Returns

domainIndex, -1: error

gptpmasterclock_getts64()

int64_t gptpmasterclock_getts64

(

void

)

get 64-bit nsec unit ts of system wide gptp clock

Returns

0 on success, -1 on error

gptpmasterclock_wait_until_ts64()

int gptpmasterclock_wait_until_ts64	(	int64_t	tts,
		int64_t	vclose,
		int64_t	toofar
	)

Wait until tts comes.

Returns

-1: error, 1:already passed, 2:in vclose, 3:farther than toofar seconds, 0:returns from nanosleep(has been waited to very close timing)

Parameters

tts	target time in nano second unit
vclose	nano second unit; treated as very close, and stop waiting even ttv is still in future
toofar	nano second unit; treated as too far, and stop waiting

gptpmasterclock_expand_timestamp()

uint64_t gptpmasterclock_expand_timestamp

(

uint32_t

timestamp

)

expand 32-bit nsec time to 64 bit with aligning to gptp clock.

Parameters

timestamp

timestamp which we are going to convert into 32bit to 64 bit.

Returns

expanded time

Note

a range of -2.147 to 2.147 secconds can be correctly aligned

gptpmasterclock_expand_timestamp_ts64()

uint64_t gptpmasterclock_expand_timestamp_ts64	(	uint32_t	timestamp,
		int64_t	ts64
	)

expand 32-bit nsec time to 64 bit with aligning to gptp clock at the time ts64.

Parameters

timestamp	timestamp which we are going to convert into 32bit to 64 bit.
ts64	the gptp clock time that the timestamp will be aligned to.

Returns

expanded time

Note

a range of -2.147 to 2.147 secconds can be correctly aligned

gptpmasterclock_gmchange_ind()

int gptpmasterclock_gmchange_ind

(

void

)

get GM change indicator, the number is incremented whenever GM is changed

Returns

GM change indicator value, -1: on error

gptpmasterclock_get_max_domains()

int gptpmasterclock_get_max_domains

(

void

)

get maximum number of domains

Returns

returns available number of domains.

gptpmasterclock_get_domain_ts64()

int gptpmasterclock_get_domain_ts64	(	int64_t *	ts64,
		int	domainIndex
	)

get a synchronized clock value on specific domain

Parameters

ts64	pointer to return clock value
domainIndex	domain index number

Returns

0 on success, -1 on error.

gptpmasterclock_dump_offset()

void gptpmasterclock_dump_offset

(

void

)

print phase offset for all domains