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An Arduino setup that allows for debugging raspberry pi's and other similar serial ttl hardware easily Includes lcd/keyboard combo board to allow on-site debugging and repairs

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README.md

Serial Debugger

A debug console for serial TTL. This can be used to work with serial TTL directly or operate as a pass through for a computer.

Hardware / BoM

Item	Quantity	Unit Cost
Keyboard FeatherWing (Keyboard + LCD)	1	$55.00
Feather nRF52840 Express	1	$24.95
Feather M0 Basic Proto	1	$19.95
FeatherWing Proto	1	$4.95
2x20 pin IDC Box Header	1	$0.75
GPIO Ribbon Cable for Raspberry Pi	1	$2.95
Header Kit for Feather	1	$0.96
I2C Non-Volatile FRAM Breakout	2	$9.95

Hardware Docs

Implementation (Incomplete)

Main board has FRAM break out for configuration persistence
Converter board has FRAM break out for configuration persistence
Setup 2nd feather + proto board as a 40 pin socket
2nd feather acts as a mux between different rpi uarts (0 and 1 and 5 in particular)
2nd feather talks via qwiic connector over i2c to main board
User button on feather to flip between usb and local serial (aka : can be used as a serial adapter)
- Note this on the UI
Fall back to internal uart pins if no expander is present
- Note this on the UI
Adapter board falls back to saved config and goes into stand alone via usb port if it's not seeing the main board
Main board startup shows connection setup + waits for OK prompt via main hat switch
Main board has a status bar @ bottom with battery level, selected uart, selected speed
Main board does simple display of serial in/out via lcd
Main board has a button for accessing symbols via pop-up list that aren't on keyboard
Main board has a button for accessing a uart selection pop-up that maps to rpi uarts
Main board has a button for accessing password selection pop-up to help with password entry over serial
Main board has a button for accessing uart speed pop-up to help with configuring line speeds

Implementation (Complete)

Battery level on feather neopixel (green = >80% ; yellow >=40% ; orange >= 25% ; red < 25%)
User LED (red) always on when feather is running

Building / Uploading

The make.ps1, build.ps1 and upload.ps1 scripts can be used to build/upload this project. These scripts call the arduino-cli commands programatically.

Licensing

Unless otherwise stated all source code is licensed under the Apache 2 License.

Unless otherwise stated the non source code contents of this repository are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License