Crate culvert 

Typed access to the HDMI 2.1 SCDC (Status and Control Data Channel) register map.

Culvert sits on top of hdmi_hal::scdc::ScdcTransport and provides named structs, bitfield types, and typed operations for scrambling control, FRL training primitives, and CED (Character Error Detection) reporting.

The central type is Scdc, a thin stateless client that wraps a transport and exposes one typed method per register group. Sequencing of register operations — rate selection, timeout handling, retry logic — belongs in the link training crate above.

Structs

CedCount

A 15-bit character error count decoded from an ERR_DET register pair.

CedCounters

Per-lane character error counts decoded from ERR_DET registers (0x50–0x57).

FrlConfig

Configuration written to Config_0 (0x30).

Scdc

Typed client for the HDMI 2.1 SCDC (Status and Control Data Channel) register map.

ScramblerStatus

Decoded content of Scrambler_Status (0x21).

StatusFlags

Decoded content of Status_Flags_0 (0x40) and Status_Flags_1 (0x41).

TmdsConfig

Configuration written to TMDS_Config (0x20).

UpdateFlags

Decoded content of Update_0 (0x10) and Update_1 (0x11).

Enums

FfeLevels

FFE (Feed-Forward Equalization) level count written into Config_0 bits[5:3].

FrlRate

Maximum Fixed Rate Link (FRL) bandwidth supported by a HDMI 2.1 sink.

LtpReq

Link Training Pattern requested by the sink via Status_Flags_1 bits[7:4].

ProtocolError

Protocol-level violations detected while decoding SCDC register content.

ScdcError

Errors returned by Scdc register operations.