Enum RecordHeader 

pub enum RecordHeader {
    Definition {
        local_mesg_num: u8,
        has_dev_data: bool,
    },
    Data {
        local_mesg_num: u8,
    },
    CompressedTimestamp {
        local_mesg_num: u8,
        timestamp_offset: u8,
    },
}

Classification of a single record-header byte.

Variants

Definition

Definition message — declares the schema for one of the 16 local slots.

Fields

local_mesg_num: u8

Local message number (0..=15).

has_dev_data: bool

True when bit 5 is set: Definition is followed by developer-field definitions in addition to the standard fields.

Data

Data message — payload follows, parsed against the Definition stored in local_mesg_num’s slot.

Fields

local_mesg_num: u8

Local message number (0..=15).

CompressedTimestamp

Compressed-timestamp data message. Bit 7 = 1; only 2 bits available for local_mesg_num, 5 bits for the timestamp delta against the most recent full timestamp seen.

Fields

local_mesg_num: u8

Local message number (0..=3, 2-bit field).

timestamp_offset: u8

Timestamp delta in seconds against the last full timestamp (0..=31).

Implementations

impl RecordHeader

pub const COMPRESSED_TIMESTAMP_MASK: u8 = 0x80

Bit 7. When set, this is a CompressedTimestamp data record.

pub const DEFINITION_MASK: u8 = 0x40

Bit 6 (only meaningful when bit 7 = 0). When set, this is a Definition.

pub const DEV_DATA_MASK: u8 = 0x20

Bit 5 (only meaningful when bit 6 = 1). When set, the Definition contains developer-field declarations.

pub const LOCAL_MESG_NUM_MASK: u8 = 0x0F

Bits [3:0]. Local message number for Definition / Data records.

pub const COMPRESSED_LOCAL_MASK: u8 = 0x60

Bits [6:5]. Local message number when the compressed-timestamp bit is set.

pub const TIMESTAMP_OFFSET_MASK: u8 = 0x1F

Bits [4:0]. Timestamp delta for compressed-timestamp records (0..=31 seconds).

pub fn classify(byte: u8) -> Self

Decode a single record-header byte.

pub fn local_mesg_num(&self) -> u8

Local message number, common to all three record types.

pub fn has_dev_data(&self) -> bool

True iff this is a Definition with the developer-data flag set.

Trait Implementations

impl Clone for RecordHeader

fn clone(&self) -> RecordHeader

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RecordHeader

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for RecordHeader

fn eq(&self, other: &RecordHeader) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for RecordHeader

impl Eq for RecordHeader

impl StructuralPartialEq for RecordHeader