tSoeHeaderControlUnion Union Reference

Union providing bit-field and byte-level access to the SoE header control and element fields. More...

#include <packet-ecatmb.h>

Public Attributes
struct {
uint8_t   OpCode: 3
uint8_t   InComplete: 1
uint8_t   Error: 1
uint8_t   DriveNo: 3
uint8_t   DataState: 1
uint8_t   Name: 1
uint8_t   Attribute: 1
uint8_t   Unit: 1
uint8_t   Min: 1
uint8_t   Max: 1
uint8_t   Value: 1
uint8_t   Reserved: 1
}	v
struct {
uint8_t   Control
uint8_t   Element
}	v2

Detailed Description

Union providing bit-field and byte-level access to the SoE header control and element fields.

Member Data Documentation

Attribute

uint8_t tSoeHeaderControlUnion::Attribute

Attribute element follows or is requested.

Control

uint8_t tSoeHeaderControlUnion::Control

Raw control byte (OpCode, InComplete, Error, DriveNo).

DataState

uint8_t tSoeHeaderControlUnion::DataState

Data-state element follows (response) or is requested (request).

DriveNo

uint8_t tSoeHeaderControlUnion::DriveNo

Drive number addressed by this SoE message (0–7).

Element

uint8_t tSoeHeaderControlUnion::Element

Raw element flags byte (DataState … Reserved).

Error

uint8_t tSoeHeaderControlUnion::Error

Error flag: non-zero if an error word follows the header.

InComplete

uint8_t tSoeHeaderControlUnion::InComplete

More-follows flag: non-zero if additional fragments are pending.

Max

uint8_t tSoeHeaderControlUnion::Max

Maximum value element follows or is requested.

Min

uint8_t tSoeHeaderControlUnion::Min

Minimum value element follows or is requested.

Name

uint8_t tSoeHeaderControlUnion::Name

Name element follows or is requested.

OpCode

uint8_t tSoeHeaderControlUnion::OpCode

Operation code; see ECAT_SOE_OPCODE_* values (0 = unused).

Reserved

uint8_t tSoeHeaderControlUnion::Reserved

Reserved; must be zero.

Unit

uint8_t tSoeHeaderControlUnion::Unit

Unit element follows or is requested.

[struct]

struct { ... } tSoeHeaderControlUnion::v

Structured bit-field access.

[struct]

struct { ... } tSoeHeaderControlUnion::v2

Byte-level access to the two control octets.

Value

uint8_t tSoeHeaderControlUnion::Value

Value element follows or is requested.

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

• /builds/wireshark/wireshark/plugins/epan/ethercat/packet-ecatmb.h