Phase 6 — Wire TFT SPI + fill screen¶

Add five SPI wires and prove the panel draws. Power (Phase 2) and sensor I2C (Phases 3–5) 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¶

This bench Estardyn prints SCK (not SCL) for SPI clock. Silk may say RES or RST — both are reset. Do not tie TFT SDA to sensor SDA (GPIO8). All five SPI wires 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 10.59 seconds =========================

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

weather tft-fill — phase 6
SPI SCK=12 MOSI=11 CS=10 DC=9 RST=7  BL=3V3(phase2)
I2C SHT40@0x44=ack BMP390@0x77=ack — buses coexist
cycling red -> green -> blue every 1 s
fill RED
fill GREEN
fill BLUE

This bench: panel cycles RGB; I2C still acks both sensors with SPI active.

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
• TFT SDA is not on the I2C SDA net

Checkpoint 6¶

• [x] Visible full-screen color change on TFT
• [x] Serial shows I2C ack for SHT40 + BMP390 (buses coexist)
• [x] Logged in lab-log.md

Stop here until checkpoint passes.

Next: Phase 7 — Climate UI