39 lines
1.8 KiB
Markdown
39 lines
1.8 KiB
Markdown
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# MUX - Raspberry Pi Edition
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This folder contains the necessary sources and information to build a MUX for Raspberry Pis. This mux can be used independently or with the controller.
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Note : The mux needs to be configured via sources if not used with the controller.
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## Important Considerations
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- The Raspberry Pi 4 has 5 available UARTS and we only document how to wire for UART0/1 and UART5
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- The Raspberry Pi's prior to the 4 had only UART0 exposed. Please use ONLY the UART0 configuration and setup for these devices.
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## Hardware / BoM
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| Item | Quantity | Unit Cost |
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| ---- | -------- | --------- |
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| [Feather M0 Basic Proto](https://www.adafruit.com/product/2772) | 1 | $19.95 |
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| [FeatherWing Proto](https://www.adafruit.com/product/2884) | 1 | $4.95 |
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| [2x20 pin IDC Box Header](https://www.adafruit.com/product/1993) | 1 | $0.75 |
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| [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 |
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| [I2C Non-Volatile FRAM Breakout](https://www.adafruit.com/product/1895) | 2 | $9.95 |
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## Implementation (Incomplete)
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- FRAM break out for configuration persistence
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- Fall back to saved config *and* goes into stand alone via usb port *if* it's not seeing the main board
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- Receive configuration over i2c
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- Save configuration to FRAM
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- FRAM config reading
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- Ability to have USB *and* i2c for the UART output
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- Use ring buffer @ 16k for i2c
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- Send direct to USB and then add to ring buffer (always send over usb even if not used)
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## Implementation (Complete)
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## Building / Uploading
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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.
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