Phase 6 — Wire TFT SPI + fill screen¶

Add five SPI wires and prove the panel draws. Power (Phase 2) and IMU I2C (Phases 3–4) stay on. BL is already on 3V3 — no new backlight wire.

Firmware¶

Changed. New folder firmware/06-tft-fill/.

Preconditions¶

• Checkpoint 5 passed
• Unplug USB while seating SPI jumpers

6.1 SPI wires¶

Do not tie TFT SDA to IMU SDA. All five or the panel stays blank.

6.2 Flash¶

Stop any serial monitor on COM first.

cd firmware/06-tft-fill
pio run -e esp32-s3-n16r8 -t upload --upload-port /dev/ttyACM0

Connected to ESP32-S3 on /dev/ttyACM0:
…
Hash of data verified.
Hard resetting via RTS pin...
========================= [SUCCESS] Took 34.13 seconds =========================

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

seismo tft-fill — phase 6
SPI SCK=12 MOSI=11 CS=10 DC=9 RST=7  BL=3V3(phase2)
IMU WHO_AM_I=0x6C (expect 0x6C) — buses coexist
cycling red → green → blue every 1 s
fill RED
fill GREEN
fill BLUE

Panel should cycle full-screen red → green → blue.

6.3 If blank¶

• Confirm 4-SPI jumpers on the module (silk R3+R5)
• BL still powered (Phase 2)
• CS/DC/RST not swapped
• All five SPI wires seated

Checkpoint 6¶

• [x] Visible full-screen color change on TFT
• [x] Serial shows WHO_AM_I=0x6C (I2C still up with SPI)
• [x] Logged in lab-log.md

Stop here until checkpoint passes.

Next: Phase 7 — Intensity UI