florid_usb_protocol

This repository holds the shared USB protocol definitions used by Usb2Arm.

Current scope:

• bootloader upgrade protocol on top of RPL USB framing
• packet definitions plus host/device shared upgrade image helpers
• platform-independent transport alias for RPL::USBTransport

Main header:

#include <florid_usb_protocol/protocol.hpp>

Upgrade protocol notes:

• request packets use RPL request/ack semantics
• data-bearing responses are separate packets carrying the original req_id
• WriteChunkRequest currently uses a fixed 1024-byte payload ceiling
• data_size is the aligned flash-programming length for the current chunk
• valid_size is the logical image byte count inside that chunk; trailing bytes are 0xFF padding when valid_size < data_size
• FirmwareImage / ChunkPlan / UpgradePlan are transport-agnostic helpers for image CRC calculation, aligned chunking, and request packet building
• USB send/receive, retries, session state machines, and bootloader flash logic still belong in product code rather than this shared protocol library