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Scott Lahteine
2024-01-05 12:34:50 -06:00
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docs/BinaryFileTransferProtocol.md
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# Marlin Binary File Transfer (BFT)
Marlin is capable of transferring binary data to the internal storage (SD card) via serial when built with `BINARY_FILE_TRANSFER` enabled. The following is a description of the binary protocol that must be used to conduct transfers once the printer is in binary mode after running `M28 B1`.
Marlin is capable of transferring binary data to the internal storage (SD card) via serial when built with `BINARY_FILE_TRANSFER` enabled. The following is a description of the binary protocol that must be used to conduct transfers once the printer is in binary mode after running `M28 B1`.
## Data Endianness
All data structures are **little-endian**! This means that when constructing the packets with multi-byte values, the lower bits are packed first. For example, each packet should start with a 16-bit start token with the value of `0xB5AD`. The data itself should start with a value of `0xAD` followed by `0xB5` etc.