Function parseSiiBuffer

Parse a raw EtherCAT Slave Information Interface (SII) EEPROM buffer.

Returns

Parsed SlaveInformationInterface.

Remarks

The SII structure consists of:

1. Fixed header (first 128 bytes) Parsed using: @HHHHH4xHLLLL8xHHHHHHHHH66xHHHH

   Contains:

   • PDI configuration and control
   • Vendor/product identification
   • Mailbox configuration
   • EEPROM size and version

2. Category section (starting at offset 128) A sequence of variable-length categories:

   Category layout:

   • uint16 categoryType
   • uint16 categoryWordSize (number of 16-bit words)
   • payload (categoryWordSize * 2 bytes)

   Parsing continues sequentially until:

   • Category type 0xFFFF (END), or
   • Category type resolves to NOP

• Recognized categories are dispatched to dedicated parsers:

  • STRINGS → parseSiiCategoryStrings
  • GENERAL → parseSiiCategoryGeneral
  • FMMU → parseSiiCategoryFmmu
  • SYNC_M → parseSiiCategorySyncManager
  • RXPDO / TXPDO → parseSiiCategoryPdo
  • DC → parseSiiCategoryDc

• Multiple PDO categories are supported and accumulated.

Note

• Unrecognized categories are skipped.

• No validation is performed for:

  • Buffer size correctness
  • Category alignment or integrity
  • Semantic correctness of parsed values

• String indices in parsed structures refer to entries from the STRINGS category.

• This function assumes little-endian layout and native alignment as used by python-struct.