Struct Cdc2ReplyPacket 

pub struct Cdc2ReplyPacket<const CMD: u8, const ECMD: u8, P: Decode> {
    pub size: u16,
    pub payload: Result<P, Cdc2Ack>,
    pub crc16: u16,
}

CDC2 (Extended) Reply Packet

This type decodes a device-to-host reply packet used in the extended CDC2 protocol. The payload type P must implement Decode.

All CDC2 replies are sent in response to a corresponding Cdc2CommandPacket from the host. For example, a SystemFlagsPacket command corresponds to a SystemFlagsReplyPacket reply.

Reply packets encode an acknowledgement code in the form of a Cdc2Ack, which will either acknowledge the command as valid and successful (Cdc2Ack::Ack) or return a negative acknowledgement if there was a problem processing or servicing the command.

Encoding

This is an extension of the standard CdcReplyPacket encoding that adds:

• An extended command opcode (ecmd).
• A packet acknowledgement code (Cdc2Ack).
• A CRC16 checksum covering the entire packet (including header).

Field	Size	Description
header	2	Must be REPLY_HEADER.
cmd	1	A CDC command opcode, typically USER_CDC (for a brain) or CON_CDC (for a controller).
size	1–2	Number of remaining bytes in the packet (starting at ecmd through crc16), encoded as a VarU16.
ecmd	1	A CDC2 extended command opcode.
ack	1	A CDC2 packet acknowledgement code.
payload	n	Encoded payload; potentially optional if a NACK occurs
crc16	2	CRC16 checksum of the whole packet, computed with the VEX_CRC16 algorithm.

Fields

size: u16

Total payload size. This includes the size taken by the ecmd, ack, and crc fields.

payload: Result<P, Cdc2Ack>

Payload. Only decoded if the packet is acknowledged.

crc16: u16

CRC16 calculated from the entire packet contents.

Implementations

impl<const CMD: u8, const ECMD: u8, P: Decode> Cdc2ReplyPacket<CMD, ECMD, P>

pub const HEADER: [u8; 2] = REPLY_HEADER

pub fn ack(&self) -> Cdc2Ack

Trait Implementations

impl<const CMD: u8, const ECMD: u8, P: Clone + Decode> Clone for Cdc2ReplyPacket<CMD, ECMD, P>

fn clone(&self) -> Cdc2ReplyPacket<CMD, ECMD, P>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<const CMD: u8, const ECMD: u8, P: Decode> Decode for Cdc2ReplyPacket<CMD, ECMD, P>

fn decode(data: &mut &[u8]) -> Result<Self, DecodeError>

Attempts to decode Self from the beginning of the provided byte slice.

impl<const CMD: u8, const ECMD: u8, P: PartialEq + Decode> PartialEq for Cdc2ReplyPacket<CMD, ECMD, P>

fn eq(&self, other: &Cdc2ReplyPacket<CMD, ECMD, P>) -> 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<const CMD: u8, const ECMD: u8, P: Copy + Decode> Copy for Cdc2ReplyPacket<CMD, ECMD, P>

impl<const CMD: u8, const ECMD: u8, P: Eq + Decode> Eq for Cdc2ReplyPacket<CMD, ECMD, P>

impl<const CMD: u8, const ECMD: u8, P: Decode> StructuralPartialEq for Cdc2ReplyPacket<CMD, ECMD, P>