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Feather at 5v for 32u4 for GIMX
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Feather at 5v for 32u4 for GIMX

by forbiddenera on Fri Feb 01, 2019 6:59 am

Hey there,

So the only board I could find locally easily with a 32u4 was a Feather :)

Looks cool.. want to use it as a GIMX adapter.

This requires it to run at 5v/16mhz... the chip can do it, but from what I can tell the feather runs at 3v3/8mhz...

Can I mod my board to fix this or something? I'm not having any luck getting it working for this application..so close..but so far..didn't want to have to get different hardware.. I have the right micro right here..!

I've flashed the GIMX firmware no problem with avrdude.. after that, the gimx app is unable to communicate with the 32u4 via the UART like it should be able to..

I did also post on the GIMX forums and the creator I believe responded saying it won't work at 3v3, of course..

So, mainly, running [email protected] possilbilities?

ps link to gimx thready
https://gimx.fr/forum/viewtopic.php?f=5&t=2854

forbiddenera
 
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Re: Feather at 5v for 32u4 for GIMX

by forbiddenera on Sat Feb 02, 2019 7:06 pm

No one? Anyone?

I find it hard to believe no ones ever wanted to either make a gimx with one or use a feather at 5v/16mhz?

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Re: Feather at 5v for 32u4 for GIMX

by forbiddenera on Sat Feb 02, 2019 7:13 pm

Matlo wrote: ↑Fri Feb 01, 2019 5:46 am
The firmware sets the clock to 16MHz. From datasheet this requires power supply to be 5V. From the specs you provided your board has a 3.3V power supply. This is not going to work and there is no way to change power supply voltage without hardware modification.


Fine by me. Before I mess with anything though, has anyone run a feather at 5v? Is there any pre-planned anything on the board for 5v operation?

I was thinking I could simply run the proc off usb power (bypass the regulator).. I did notice there is an enable pin for the regulator but I don't know if this affects the micro or just "aux" power

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Re: Feather at 5v for 32u4 for GIMX

by forbiddenera on Sat Feb 02, 2019 7:51 pm

Without touching my soldering iron or a exacto..it seems as though I have bypassed the onboard vreg.

Schematic appears to show the 3v3 pin on the breakout board is connected to the micro. Didn't see any diodes.

Feeding 5v from an Arduino Mega (just whatever I happened to have within reach that has a 5v reg) to the 3v3 pin and ground, it appears to run the micro & I am able to access the bootloader for flashing.

Now, while this worked for testing - if I plug in the USB side, the reg will still be feeding that line 3v3 while I am feeding it 5v from somewhere else..probably not a HUGE issue but now that the micro is powered, I can d/c (cut) the vreg.

So..I should be running at 5v now..my Arduino should also be good for 5v UART so I might try that too..

Anyone more experienced than me please point out any issues/problems/stupidity I may missed?

forbiddenera
 
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Re: Feather at 5v for 32u4 for GIMX

by forbiddenera on Sat Feb 02, 2019 9:01 pm

Is simply pulling the enable pin to ground and throwing 5v at the 3v3 pin enough? Seems like when it is disabled, no power comes from USB anymore..just hoping this works as it's easier than connecting directly to the micro or near it.

I fed 5v directly to the output leg of the vreg for testing..was able to flash it (can flash it at 3v3 too of course, but shows the micro is on and running at 5v) but my firmware still not working it seems.

Any help appreciated. Thanks!

forbiddenera
 
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Re: Feather at 5v for 32u4 for GIMX

by forbiddenera on Sat Feb 02, 2019 9:08 pm

K so it definitely seems like if I disable the vreg and feed 5v that the chip gets 5v..so..now what isn't working

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Re: Feather at 5v for 32u4 for GIMX

by forbiddenera on Thu Feb 14, 2019 6:38 pm

Bump...?

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Re: Feather at 5v for 32u4 for GIMX

by forbiddenera on Sun Feb 17, 2019 2:41 am

Anyone??? At all???

This is making me sad.

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Re: Feather at 5v for 32u4 for GIMX

by forbiddenera on Fri Feb 22, 2019 1:56 pm

I have to say I am pretty upset that every thread I see on here almost has a response from Ada but not this.

Been waiting weeks for an answer to find out info I got before was wrong and I need a 16mhz xtal

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Re: Feather at 5v for 32u4 for GIMX

by franklin97355 on Fri Feb 22, 2019 3:34 pm

The Feather is designed to run at 3.3v and if you want to convert it you may but you are on your own. You should get a board that meets your specific needs if that is what you want. The Arduino Micro is a 5-volt 32u4 board.

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