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Phase 1 — Hello flash

Build, flash, and read serial on the erased N16R8. No IMU or TFT yet — just prove the tool chain.

flowchart LR
  Host[pio] -->|upload| COM["ttyACM0"]
  COM --> App[hello]
  App -->|115200| Host

Firmware

Changed — first app. Standalone tree firmware/01-hello/ — leave it alone later; new phases get new folders. Tracker: Firmware.

Preconditions

1.1 Build

cd firmware/01-hello
pio run -e esp32-s3-n16r8

RAM:   [=         ]   8.1% (used 26700 bytes from 327680 bytes)
Flash: [=         ]   5.8% (used 380669 bytes from 6553600 bytes)
========================= [SUCCESS] Took 10.19 seconds =========================

1.2 Upload

pio run -e esp32-s3-n16r8 -t upload --upload-port /dev/ttyACM0

Connecting....
Connected to ESP32-S3 on /dev/ttyACM0:
Chip type:          ESP32-S3 (QFN56) (revision v0.2)
Auto-detected flash size: 16MB
…
Hash of data verified.
Hard resetting via RTS pin...
========================= [SUCCESS] Took 10.32 seconds =========================

Stuck on Connecting…? Hold BOOT, tap RST, release BOOT, retry.

1.3 Serial

pio device monitor -b 115200 --port /dev/ttyACM0

seismo hello — phase 1
MAC=28:84:85:8C:D0:40
chip=ESP32-S3 flash=16MB psram=8388608 bytes
seismo hello MAC=28:84:85:8C:D0:40 uptime_ms=602
seismo hello MAC=28:84:85:8C:D0:40 uptime_ms=1613
seismo hello MAC=28:84:85:8C:D0:40 uptime_ms=2613

MAC must match Phase 0 (28:84:85:8C:D0:40). Flash 16MB and PSRAM 8MB confirm the N16R8 image.

Checkpoint 1

  • [x] Build succeeds
  • [x] Upload verifies (Hash of data verified)
  • [x] Serial shows the hello line every ~1 s
  • [x] Logged in Lab log

Next: Phase 2 — Power the TFT