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Wiring diagram
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harbaum committed Oct 4, 2023
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15 changes: 3 additions & 12 deletions README.md
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Expand Up @@ -124,18 +124,9 @@ The MiSTeryNano currently implements some basic mouse control via
five digital direction inputs on the Tang Nano 20k which need to be
switched to GND.

| Function | Pin Name | Pin No |
|----------|---------:|-------:|
| Button-R | IOB8A | 27 |
| Button-L | IOB8B | 28 |
| Right | IOB6A | 25 |
| Left | IOB6B | 26 |
| Down | IOB14A | 29 |
| Up | IOB14B | 30 |
| GND | GND | |
![MiSTeryNano wiring](images/wiring.png)

Alternally a [Blackberry
Trackball](https://www.sparkfun.com/products/retired/13169) can be
used on the same pins. In this case the core needs to be
re-synthesized with the [```BLACKBERRY_TRACKBALL``` option defined](https://github.com/harbaum/MiSTeryNano/blob/654294ce95bff70d2db4991c88532ad7a3cf4b26/src/tangnano20k/top.sv#L3)
instead of ```JOYSTICK_MOUSE```.
used on the same pins. In this case the ```TRACKB``` config switch
needs to be closed.

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