71 lines
2.8 KiB
Markdown
71 lines
2.8 KiB
Markdown
# MUX - Raspberry Pi Edition
|
|
|
|
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.
|
|
|
|
Note : The mux needs to be configured via sources if not used with the controller.
|
|
|
|
## Important Considerations
|
|
|
|
- The Raspberry Pi 4 has 5 available UARTS and we only document how to wire for UART0/1 and UART5
|
|
- The Raspberry Pi's prior to the 4 had only UART0 exposed. Please use ONLY the UART0 configuration and setup for these devices.
|
|
|
|
## Hardware / BoM
|
|
|
|
| Item | Quantity | Unit Cost |
|
|
| ---- | -------- | --------- |
|
|
| [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 |
|
|
| [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 |
|
|
|
|
## Schematic
|
|
|
|
This build is ```i2c``` focused for additional parts. Please hookup using standard ```i2c``` methods.
|
|
|
|
| Raspberry Pi Header Pin | Arduino Pin |
|
|
| ----------------------- | ----------- |
|
|
| 39 | Gnd |
|
|
| 8 (TX) | D11 (RX) |
|
|
| 10 (RX) | D10 (TX) |
|
|
| 32 (TX) | MISO (RX) |
|
|
| 33 (RX) | MOSI (TX) |
|
|
| 1 | NOT CONNECTED TO ANYTHING / CUT PIN ON HEADER |
|
|
| 2 | NOT CONNECTED TO ANYTHING / CUT PIN ON HEADER |
|
|
| 3 | NOT CONNECTED TO ANYTHING / CUT PIN ON HEADER |
|
|
| 4 | NOT CONNECTED TO ANYTHING / CUT PIN ON HEADER |
|
|
| 13 | NOT CONNECTED TO ANYTHING / CUT PIN ON HEADER |
|
|
| 14 | NOT CONNECTED TO ANYTHING / CUT PIN ON HEADER |
|
|
| 15 | NOT CONNECTED TO ANYTHING / CUT PIN ON HEADER |
|
|
| 16 | NOT CONNECTED TO ANYTHING / CUT PIN ON HEADER |
|
|
|
|
## Libraries Used
|
|
|
|
### Local
|
|
|
|
These libraries are used by the project and contained in the ```src/``` folder local to the project.
|
|
|
|
### External
|
|
|
|
These libraries are used by the project and can be installed via the Arduino IDE library manager.
|
|
|
|
- [CircularBuffer](https://github.com/rlogiacco/CircularBuffer)
|
|
|
|
## Implementation (Incomplete)
|
|
|
|
- FRAM break out for configuration persistence
|
|
- Fall back to saved config *and* goes into stand alone via usb port *if* it's not seeing the main board
|
|
- Receive configuration over i2c
|
|
- Save configuration to FRAM
|
|
- FRAM config reading
|
|
- Ability to have USB *and* i2c for the UART output
|
|
- Use ring buffer @ 16k for i2c
|
|
- Send direct to USB and then add to ring buffer (always send over usb even if not used)
|
|
|
|
## Implementation (Complete)
|
|
|
|
## 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.
|