MasterTriggerEvent Struct Reference

#include <events.h>

Public Member Functions
auto	get_timestamp_gps48 () const -> u64
auto	get_timestamp_gps () const -> u32
	Get the timestamp as sent by the GPS.
auto	get_timestamp_abs48 () const -> u64
auto	get_rb_link_ids () const -> Vec< u8 >
auto	get_trigger_hits () const -> Vec< std::tuple< u8, u8, u8, LTBThreshold > >
auto	get_trigger_sources () const -> Vec< TriggerType >
	Get the trigger sources from trigger source byte.
auto	to_string () const -> std::string
	String representation of the struct.

Static Public Member Functions
static auto	from_bytestream (const Vec< u8 > &bytestream, u64 &pos) -> MasterTriggerEvent

Public Attributes
EventStatus	event_status = EventStatus::Unknown
u32	event_id = 0
	event_id as assigned by the MasterTriggerBoard
u32	timestamp = 0
	MTB timestamp.
u32	tiu_timestamp = 0
	Tracker (?) timestamp.
u32	tiu_gps32 = 0
	GAPS GPS clock value (slow)
u32	tiu_gps16 = 0
	GAPS GPS clock value (fast)
u32	crc = 0
	triggered paddles as seen by the MTB
u16	trigger_source = 0
u32	dsi_j_mask = 0
Vec< u16 >	channel_mask = Vec<u16>()
u64	mtb_link_mask = 0

Static Public Attributes
static constexpr u16	HEAD = 0xAAAA
	begin struct marker
static constexpr u16	TAIL = 0x5555
	end struct marker
static constexpr usize	SIZE = 0
	Variable size for MasterTriggerEvent.

Detailed Description

The MasterTriggerEvent represesnts the information provided by the MTB for this one specific event. Most notably, it includes a board mask, which is the DSI/J connections which triggered, and a hit mask. The hit mask gives hit channels per DSI/J, which correspond to hit channels on a LTB.

FIXME -compatibiltiy. Reading older data, we have 2 scenarios - either 113 bytes of fixed size for 20 LTBs, or 133 bytes for 25 LTBs. We can modify from_bytestream to at least not throw an error when reading older data, but this would currently be a todo of lower priority

Member Function Documentation

from_bytestream()

static auto MasterTriggerEvent::from_bytestream ( const Vec< u8 > &  bytestream, u64 &  pos  ) -> MasterTriggerEvent

static

Factory function for MasterTriggerEvent

Deserialize a MasterTriggerEvent from a vector of of bytes

Parameters

bytestream	Byte representation of a MasterTriggerEvent, or including one at pos
pos	: Expected position of MasterTriggerEvent::HEAD in the stream

get_timestamp_abs48()

auto MasterTriggerEvent::get_timestamp_abs48

(

)

const -> u64

Get absolute timestamp which is calculated with the help of the 1pps pulse from the GPS

get_timestamp_gps48()

auto MasterTriggerEvent::get_timestamp_gps48

(

)

const -> u64

The combined GPS 48bit timestamp into a 48bit timestamp

get_trigger_hits()

auto MasterTriggerEvent::get_trigger_hits

(

)

const -> Vec< std::tuple< u8, u8, u8, LTBThreshold > >

Get the combination of triggered DSI/J/CH on the MTB which formed the trigger. This does not include further hits which fall into the integration window. For those, se rb_link_mask

The returned values follow the TOF convention to start with 1, so that we can use them to look up LTB ids in the db.

Returns

Vec<(hit)> where hit is (DSI, J, CH)

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The documentation for this struct was generated from the following file:

• /home/runner/work/gaps-online-software/gaps-online-software/tof/dataclasses/C++/include/events.h