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Forum Index : Microcontroller and PC projects : PicoMite VGA SD Card not working

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ms_donna
Newbie

Joined: 19/03/2023
Location: United States
Posts: 2
Posted: 02:52pm 21 Mar 2023
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Hello - I'm new to the PicoMite VGA and put the kit together with no issues: VGA works great, kbd as well - I love the form factor. When I set the options for the SD card, issuing a FILES kept telling me "No SD Card Found". I unsoldered the SD card adaptor, got one on a breakout board and hooked up the PicoMite and new SD card breakout on a breadboard. I clear the flash, and reloaded 5.07.04 with the same results.

I checked GP10 - GP13 when issuing the FILES command, and I'm seeing the clock on 10, CS on 13, and some very minimal activity on 11 & 12. I have cleared the flash, and reloaded PicoMiteVGAV5.07.04.uf2 multiple times now with no change.

I have tried a new 32GB card (dos formatted) as well as an old 2GB card.  I'll hunt around to see if I have any others laying around to try.

Any suggestions are appreciated.  I anxious to get it all working. :)
 
thwill

Guru

Joined: 16/09/2019
Location: United Kingdom
Posts: 3886
Posted: 03:11pm 21 Mar 2023
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Welcome onboard @ms_donna,

I probably can't fix your problem but I can anticipate the next two questions:

1. Which PicoMiteVGA have you got - photo ?
2. What is the result of OPTION LIST at the prompt ?

Best wishes,

Tom
Game*Mite, CMM2 Welcome Tape, Creaky old text adventures
 
Volhout
Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 3696
Posted: 08:10pm 21 Mar 2023
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Hi ms_donna,

When using a SD card breakout board, please ensure you have a breakout board that does not have an IC on it. The breakout boards with an IC use this IC as a level shifter from 5V (Arduino style) to 3V (SD card levels).

For the VGA mite you need to connect the picomite pins directly to the SD card connector.

The most common issue with SD card connectors is soldering. Sometimes the solder shorts the pin to the metal connector cover (I did this), sometimes the pad is laying on the board, but is not soldered.

If you use a breadboard, please make sure you have a capacitor (0.1uF parallel to 10uF) between the SD card Vdd and Vss pins. Cards really need this.

Good luck with the VGA mite...

Volhout
Edited 2023-03-22 06:11 by Volhout
PicomiteVGA PETSCII ROBOTS
 
ms_donna
Newbie

Joined: 19/03/2023
Location: United States
Posts: 2
Posted: 09:54pm 21 Mar 2023
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There was a near microscopic short between GP11 and GP12   which upon breaking fixed things.

I blame old eyes and not using a magnifier.  

Thank you both, especially Volhout for the nudge about solder shorts.

D
 
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