Unixbigot , Englisch
@Unixbigot@aus.social avatar

I've implemented a KiCad footprint that provides an "oh fuck I got tx/rx backwards again" crossover box. Not my idea but I forget where I first saw it (I think it was here on Fedi). Fit two resistors (or solder bridges) horizontally and it's straight through; fit them vertically and it's a cross-over.

https://github.com/accelerando-consulting/Kicad-Libraries/tree/master/Accelerando.pretty

ETA: the name of the footprint is “Oh_Fuck”.

A kicad footprint that is two resistor footprints, where the resistors can be fitted vertically to swap two lines, or horizontally for straight through
3D render of the crossover footprint, showing that it conceals the fact that you are a doofus who often gets data lines bass-ackwards.

g7vkq ,
@g7vkq@mastodon.radio avatar

@Unixbigot @revk I saw this a few years ago…but there’s a similar post on an NXP forum from 2014 (and I guess there are earlier references before that). I like the whole pokayoke approach

jwalzer ,
@jwalzer@infosec.exchange avatar

@g7vkq

would it be possible to do that with jumpers instead of resistors. so you could change it in the field instead of soldering...

@Unixbigot @revk

Unixbigot OP ,
@Unixbigot@aus.social avatar

@jwalzer @g7vkq @revk yep it can be done with jumpers too

zxguesser ,
@zxguesser@oldbytes.space avatar

@Unixbigot @jwalzer @g7vkq @revk
I did exactly that to add a drive select line crossover to my Spectrum +3 motherboard

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