I was wondering if anyone had a reference for the proper con open-source-silicon.dev #caravel-board

I was wondering if anyone had a reference for the ...

Eldrick Saleh Millares

06/01/2022, 3:32 PM

I was wondering if anyone had a reference for the proper configuration sequence for I/Os on the caravel board. I'm trying to get pin 34 to be an input, and pin 35 to be an output - what else do I need to do besides these lines of code to make that happen? https://github.com/eldrickm/caravel_board/blob/138f1dcc174ebd99064fca5bf6338598437e2de6/firmware/wakey/wakey.c#L326

Matt Venn

06/01/2022, 3:37 PM

Hey Eldrick - the #caravel channel, this one is about the pcb design

Matt Venn

06/01/2022, 3:46 PM

for outputs from the user project area, you also need the oeb line to be set low, to enable the output driver

Eldrick Saleh Millares

06/01/2022, 3:57 PM

Oops, will post in the future to there. Thanks Matt!

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Eldrick Saleh Millares

06/01/2022, 4:01 PM

@Matt Venn Quick q since it's already here - which oeb line do you mean exactly? I don't see an

oeb

mprj_io

's in

firmware/*defs_mpw-two-mfix.h*

I see

reg_la*_oenb

but you're talking about setting the I/Os, not the LA's right?

Matt Venn

06/01/2022, 4:03 PM

it's a line in the HDL

Eldrick Saleh Millares

06/01/2022, 4:05 PM

Ahh right - I think I did that here. https://github.com/eldrickm/wakey_wakey/blob/0d09570e1aa42dc209a428727e09a46fd411aa3b/rtl/wrapper/wrapper/user_proj_example.v#L135 Unfortunately this seems like it's not working. Will debug further, thanks for the second opinion

Matt Venn

06/01/2022, 4:15 PM

maybe this can help?

https://www.youtube.com/watch?v=pmgeKmqoxTs▾

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