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serial_debugger/README.md

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Initial bring up
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# 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.
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## Hardware / BoM
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| Item | Quantity | Unit Cost |
| ---- | -------- | --------- |
| [Keyboard FeatherWing (Keybaord + LCD)](https://www.tindie.com/products/arturo182/keyboard-featherwing-qwerty-keyboard-26-lcd/) | 1 | $55.00 |
| [Feather nRF52840 Express](https://www.adafruit.com/product/4062) | 1 | $24.95 |
| [Feather M0 Basic Proto](https://www.adafruit.com/product/2772) | 1 | $19.95 |
| [FeatherWing Proto](https://www.adafruit.com/product/2884) | 1 | $4.95 |
| [2x20 pin IDC Box Header](https://www.adafruit.com/product/1993) | 1 | $0.75 |
| [GPIO Ribbon Cable for Raspberry Pi](https://www.adafruit.com/product/1988) | 1 | $2.95 |
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| [Header Kit for Feather](https://www.adafruit.com/product/2886) | 1 | $0.96 |
| [I2C Non-Volatile FRAM Breakout](https://www.adafruit.com/product/1895) | 2 | $9.95 |
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## Hardware Docs
- [https://www.solder.party/docs/keyboard-featherwing/downloads/](https://www.solder.party/docs/keyboard-featherwing/downloads/)
- [https://github.com/arturo182/bbq10kbd_i2c_sw](https://github.com/arturo182/bbq10kbd_i2c_sw)
- [https://github.com/lvgl/lv_arduino](https://github.com/lvgl/lv_arduino)
## Implementation (Incomplete)
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- Main board has FRAM break out for configuration persistence
- Converter board has FRAM break out for configuration persistence
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- 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
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- Adapter board falls back to saved config *and* goes into stand alone via usb port *if* it's not seeing the main board
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- 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
## Licensing
Unless otherwise stated all source code is licensed under the [Apache 2 License](LICENSE-APACHE-2.0.txt).
Unless otherwise stated the non source code contents of this repository are licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License](LICENSE-CC-Attribution-NonCommercial-ShareAlike-4.0-International.txt)