docs: ESP32-S3 (T-Panel) runtime-validated over native USB#7
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DCP firmware now runs on a second physical board. The lamp example flashed to a LILYGO T-Panel S3 and passed all 13 round-trip cases (tools/test_uart_roundtrip.py) over the S3's native USB-Serial/JTAG interface — no CH340-class USB-UART bridge chip in the path. This adds a second runtime-validated target alongside ESP32-WROOM-32, and a second ISA generation (Xtensa LX7 vs LX6). It also exercises DCP over a native-USB CDC link for the first time: same firmware, no transport-specific code, FQBN options USBMode=hwcdc + CDCOnBoot=cdc route the Arduino `Serial` to the USB-Serial/JTAG controller. S3 build footprint: 322 KB flash / 22.7 KB globals (PSRAM disabled, which is the safe bring-up config — the lamp example does not need PSRAM, so this avoids any QSPI-vs-OPI boot-loop risk). Changes: - README "Validated on real hardware": now states two boards; adds the native-USB detail - README cross-compile matrix: ESP32-S3 row added with runtime ✓ - README roadmap bullet updated - docs/paper/main.tex §validation: two-board statement + S3 added to the portability footprint list Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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May 22, 2026
DCP firmware now runs on a second physical board. The lamp example flashed to a LILYGO T-Panel S3 and passed all 13 round-trip cases (tools/test_uart_roundtrip.py) over the S3's native USB-Serial/JTAG interface — no CH340-class USB-UART bridge chip in the path. This adds a second runtime-validated target alongside ESP32-WROOM-32, and a second ISA generation (Xtensa LX7 vs LX6). It also exercises DCP over a native-USB CDC link for the first time: same firmware, no transport-specific code, FQBN options USBMode=hwcdc + CDCOnBoot=cdc route the Arduino `Serial` to the USB-Serial/JTAG controller. S3 build footprint: 322 KB flash / 22.7 KB globals (PSRAM disabled, which is the safe bring-up config — the lamp example does not need PSRAM, so this avoids any QSPI-vs-OPI boot-loop risk). Changes: - README "Validated on real hardware": now states two boards; adds the native-USB detail - README cross-compile matrix: ESP32-S3 row added with runtime ✓ - README roadmap bullet updated - docs/paper/main.tex §validation: two-board statement + S3 added to the portability footprint list Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Second physical board validated — T-Panel S3, 13/13 round-trips over native USB-Serial/JTAG. README matrix + paper updated.