1.7 KiB
ESP32 Serial Swiss Army Knife
Universal wireless serial adaptor firmware for the ESP32-S3.
Initial hardware target
- ESP32-S3-DevKitC-1
- ESP32-S3-WROOM-1-N16R8 module
- 16 MB flash
- 8 MB octal PSRAM
The initial smoke-test firmware continuously sweeps the onboard addressable RGB LED through the color wheel at reduced brightness. The official ESP32-S3-DevKitC-1 v1.0 uses GPIO48 for the LED data signal, while official v1.1 boards use GPIO38. Compatible boards and clones may vary.
Hardware wiring
See wiring.md for hardware-specific wiring profiles. The initial profile covers the ESP32-S3-DevKitC-1 N16R8 and the Adafruit MAX3243 full-pinout RS-232 breakout.
Build
pio run
Upload and monitor
Connect the board's USB-to-UART port, then run:
pio run --target upload
pio device monitor
The application logs its startup, detected PSRAM size, and configured RGB LED GPIO at 115200 baud. Expected output includes:
ESP32-S3 build-chain smoke test started
PSRAM initialized: 8388608 bytes
Sweeping the onboard RGB LED on GPIO48
If the firmware runs but the RGB LED remains dark, verify the board revision. The project defaults to GPIO48, commonly used by DevKitC-compatible boards and official v1.0 boards. For an official v1.1 board — or another board wired that way — change RGB_LED_GPIO in platformio.ini from 48 to 38, rebuild, and upload again.
License
This project is licensed under the GNU General Public License version 3 only (GPL-3.0-only). This is compatible with using the GPLv3 releases of wolfSSL and wolfSSH later. Third-party components remain subject to their respective licenses.