Pure C reimplementation of the MAG160C thermal camera SDK, written from the recovered protocol (see analysis/protocol_spec.md for the full reverse engineering report). The previous C++ implementation was archived to analysis/legacy-cpp/; this tree replaces it.

Layout

csdk/
  include/mag160c/mag160c.h   public C ABI (error domain, magic codes, frame
                              format, temperature API, TCM framing)
  src/
    mag160c_internal.h        shared helpers (last-error)
    mag160c_error.c           TLS last-error + error names
    mag160c_frame.c           0x1bb1b11b frame parse + streaming assembler
    mag160c_temp.c            Calibration / ConvertResponse2Temperature / T2E
    mag160c_tcm.c             FTDICommand 0x7e framing + rotate/light builders
    mag160c_ir.c              libusb session (link/start/stop/ffc/info)
    mag160c_tables.h          T2E + E2TAccQ10 tables (generated from binary)
  tools/mag160c_cli.c         CLI: ir-info, ffc, start, stop, tcm-rotate,
                              tcm-light, frame-test, temp-test
  tests/                      test_frame, test_temp, test_tcm, test_api

Build

cmake -B build -S csdk          # auto-detects libusb-1.0 via pkg-config
cmake --build build
ctest --test-dir build

Without libusb-1.0 the IR session APIs return MAG160C_ERR_NOT_SUPPORTED; the pure helpers (frame parse, temperature math, TCM framing) and their tests work with no dependencies. Threads (pthread) are used when available.

Recovered protocol summary

VID 0x833C, config value 2, interface 0.
Commands: EP OUT 0x03, 8-byte packets {u32 magic, u32 param} (0x3c-byte with 0x38-byte payload for DDT). Response: EP IN 0x82 (0x1000 max, 2000 ms).
Magic commands: 0x6bb6b66b/66c prepare, 66d/66e DDT, 66f info, 670 version, 672 FFC, 673 start, 674 stop, 676/677 set params.
Magic responses: 0x5bb5b55b..55f (0x38-byte info blocks / 0x10 pair), 0x5bb5b57b file header.
Frame stream: EP IN 0x81, marker 0x1bb1b11b @0, counter @4, data length @8, type @0xc (0 response / 1 raw), shutter @0x10, pixels @0x1c (uint16 LE), trailing 0x1bb1b11c @0x1c+len, frame size 0x38+len.
Temperature: per-pixel piecewise-linear Calibration with baseline, ConvertResponse2Temperature auto-gain, T2E curve (0x112 entries) with Q13 band interpolation.
TCM: FTDICommand 0x7e framing with additive (mod-256) checksums; command table main 0x02 (rotate 0x77, light 0x31/32/33, ...).