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+# T2G seat-controller firmware
+
+`Seat_Controller_demo/` is the repository-owned IAR interface project for the
+physical seat bench. It combines the verified heater, fan and four-motor demos
+and is the only firmware accepted by the hardware executor.
+
+The Infineon/T2G vendor library is intentionally not duplicated here. The IAR
+project keeps its original relative `common/` and `tviibh8m/` references;
+`tools/build_seat_firmware.ps1` stages the repository project beside junctions
+to `COGNITIVE_AGENT_T2G_SDK_ROOT`, builds it, and copies only the resulting
+`Seat_Controller_demo.hex` and `Seat_Controller_demo.out` back into the
+repository.
+
+```powershell
+powershell -ExecutionPolicy Bypass -File .\tools\build_seat_firmware.ps1 -Profile combined
+```
+
+The build script never opens a debug probe or flashes a target. Physical
+programming is performed only by an authorized `execution_mode=hardware`
+request when `COGNITIVE_AGENT_SEAT_AUTO_FLASH_ENABLED=true` and the CAN
+identity handshake does not match the repository firmware.
+
+Automatic programming uses `IAR/Seat_Controller_program.mac`, not the
+interactive-debug `Seat_Controller_demo.mac`. The automatic-programming macro
+forces motor, fan and heater outputs low before download, clears the retained
+debug-session marker, and uses a bounded Download-and-Debug handoff with
+`--leave_target_running`. `--download_only` is intentionally not used because
+it leaves the CM0+ stopped after programming.
+
+Firmware identity protocol:
+
+- request: `0x304`, `53 45 41 54 01 00 00 00`
+- expected response: `0x305`, `53 45 41 54 01 01 00 3F`
+
+The response identifies protocol 1, firmware 1.1.0 and the combined capability
+mask. It is a non-actuating readiness probe and is checked before any seat
+control frame is sent.