Encodings¶

Charset¶

class yamcs.pymdb.Charset¶

Bases: Enum

String encoding

US_ASCII = 1¶

US-ASCII

ISO_8859_1 = 2¶

ISO-8859-1

WINDOWS_1252 = 3¶

Windows-1252

UTF_8 = 4¶

UTF-8

UTF_16 = 5¶

UTF-16

UTF_16LE = 6¶

UTF-16LE

UTF_16BE = 7¶

UTF-16BE

UTF_32 = 8¶

UTF-32

UTF_32LE = 9¶

UTF-32LE

UTF_32BE = 10¶

UTF-16BE

FloatEncodingScheme¶

class yamcs.pymdb.FloatEncodingScheme¶

Bases: Enum

Float encoding

IEEE754_1985 = 1¶

IEEE 754-1985

MILSTD_1750A = 2¶

MIL-STD-1750A

STRING = 3¶

String-encoded float

Warning

This scheme is not supported by XTCE, and will lead to invalid XML exports. However, that XML will be correctly understood by Yamcs, which does support string-based float encodings.

An alternative is to use a StringEncoding for a FloatParameter, but then you will not be able to use use calibrators.

IntegerEncodingScheme¶

class yamcs.pymdb.IntegerEncodingScheme¶

Bases: Enum

Integer encoding

UNSIGNED = 1¶

Unsigned

SIGN_MAGNITUDE = 2¶

Sign-magnitude

TWOS_COMPLEMENT = 3¶

Two’s complement

ONES_COMPLEMENT = 4¶

Ones’ complement

STRING = 5¶

String-encoded integer

Warning

This scheme is not supported by XTCE, and will lead to invalid XML exports. However, that XML will be correctly understood by Yamcs, which does support string-based integer encodings.

An alternative is to use a StringEncoding for an IntegerParameter, but then you will not be able to use use calibrators.

Encoding¶

class yamcs.pymdb.Encoding¶

Bases: object

__init__(bits: int | None = None) → None¶

BinaryEncoding¶

class yamcs.pymdb.BinaryEncoding¶

Bases: Encoding

__init__(bits: int | None = None, length_bits: int | None = None, encoder: UnnamedAlgorithm | None = None, decoder: UnnamedAlgorithm | None = None) → None¶

decoder: UnnamedAlgorithm | None¶

Custom decoder, when this encoding is used for telemetry

encoder: UnnamedAlgorithm | None¶

Custom encoder, when this encoding is used for telecommanding

length_bits: int | None¶

Length in bits of a leading size tag

IntegerEncoding¶

class yamcs.pymdb.IntegerEncoding¶

Bases: Encoding

__init__(bits: int, little_endian: bool = False, scheme: IntegerEncodingScheme = IntegerEncodingScheme.UNSIGNED, string_encoding: StringEncoding | None = None) → None¶

string_encoding: StringEncoding | None¶

String encoding, required when scheme is set to STRING.

FloatEncoding¶

class yamcs.pymdb.FloatEncoding¶

Bases: Encoding

__init__(bits: int, little_endian: bool = False, scheme: FloatEncodingScheme = FloatEncodingScheme.IEEE754_1985, string_encoding: StringEncoding | None = None) → None¶

string_encoding: StringEncoding | None¶

String encoding, required when scheme is set to STRING.

FloatTimeEncoding¶

class yamcs.pymdb.FloatTimeEncoding¶

Bases: FloatEncoding

__init__(bits: int, little_endian: bool = False, scheme: FloatEncodingScheme = FloatEncodingScheme.IEEE754_1985, offset: float = 0, scale: float = 1) → None¶

little_endian: bool¶

scheme: FloatEncodingScheme¶

string_encoding: StringEncoding | None¶

String encoding, required when scheme is set to STRING.

IntegerTimeEncoding¶

class yamcs.pymdb.IntegerTimeEncoding¶

Bases: IntegerEncoding

__init__(bits: int, little_endian: bool = False, scheme: IntegerEncodingScheme = IntegerEncodingScheme.UNSIGNED, offset: float = 0, scale: float = 1) → None¶

little_endian: bool¶

scheme: IntegerEncodingScheme¶

string_encoding: StringEncoding | None¶

String encoding, required when scheme is set to STRING.

StringEncoding¶

class yamcs.pymdb.StringEncoding¶

Bases: Encoding

__init__(bits: int | None = None, length_bits: int | None = None, max_bits: int | None = 8388608, charset: Charset = Charset.US_ASCII, termination: bytes | None = b'\x00') → None¶

max_bits: int | None¶

Maximum number of bits, in case of a dynamically sized string.

This value hints Yamcs about the buffer size that is allocated to read the string, although Yamcs can choose to use a smaller buffer when it can.

Default is 1 MB

Common encodings¶

The encodings module contains reusable data encodings. These are optional to use as you can create entirely custom data encodings.