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MMC+ compatibility with Juicebox

New MessageMMC+ compatibility with Juicebox (modified 0 times) jaem
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Hey,

I just joined this forum, as you may have noticed, although this isn't my first post. (I posted a few hours ago about where you can get SD slots for free, as this seemed to be a general woe...)
I'm trying to do the Juicebox Picture frame hack - I only found one unit when I first bought it, so I didn't want to do anything risky...
I have an MMC+ card, which has 6 more contacts than the standard MMC (4 more than SD), and I keep getting the error - Card not found (or whatever it says). My juicebox still plays the juiceware carts, so I know I haven't blown anything. I was also confused about the pull-up/-down resistor discussion, but unless that's relevant to this thread, forget about it ;) Has anyone used MMC+ successfully? Can you leave the extra pins floating? The MMC 4.1 spec lists them as DAT0..DAT7: not used (for SPI mode, that is), but it doesn't say what to do with them. It also lists CMD/DI as Open-Drain for MMC mode, but not for SPI mode. I guess they could do that, but it sounds weird - does anyone know about that?

I've asked a lot of questions, but essentially I just want to know what, if anything, I'm doing wrong.

thx,

Jeff

05-13-2007 21:51:57

New MessageRE:MMC+ compatibility with Juicebox (modified 0 times) WestfW
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I've never even seen a MMC+ card, and my only experiences is with miniSD cards.
(on the bright side, I gave a miniSD adapter to a coworker, and he put a random
miniSD card from fry's in it, and it worked...)
05-15-2007 17:36:12

New MessageRE:MMC+ compatibility with Juicebox (modified 0 times) jbfan
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Welcome Jeff,

I have a generic (no manufacturer markings) SD/MMC+ 256MB card that works in the "official" JB MP3 adapter.

Check your wiring (particularly look for solder shorts) and make sure the MMC card is formated FAT16 - it should show up in the Mem Test.

You need at least one .mp3 or .jbp file for the photo viewer software to kick in.

Hope this helps, good luck.

-J

05-15-2007 17:44:31

New MessageRE:MMC+ compatibility with Juicebox (modified 0 times) jaem
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Hi,

thanks for the suggestions, but it still doesn't work. I'll go through what I've done...

1) ordered an SD socket
2) soldered socket to *pins* on juiceware cart connector, according to this image: http://www.elinux.org/Image:Mmcschematic.jpg - I did *not* remove the juiceware connector
3) inserted 32MB MMC+ card into my Compaq Laptop, running Ubuntu Feisty, and used Gnome Partition Editor to format to FAT16
4) downloaded the sample image that used to be on the elinux.org wiki and loaded it onto the card
5) inserted the card into the socket soldered to the Juicebox and booted to diagnostic screen
6) ran mem test - result: SD card not found

7) took out the MMC+ card, and inserted a juiceware cart into the juiceware connector
8) booted normally - result: video played fine

so...
I know that the juicebox is not fried, as juiceware still plays fine, but it won't recognize my card. As I previously mentioned, there are connections on the MMC+ card that are left floating. The limited (read:free) MMC+ spec on the company website doesn't mention any problems with floating connections, and I couldn't find anything on Google. The wires I soldered to the SD connector are about an inch, max. so I doubt that that's the problem. Would it help if I desoldered the juiceware connector? I'm reluctant to do that unless it's the only thing that will work...

any ideas? am I doing anything blatantly wrong?

05-23-2007 15:35:20

New MessageRE:MMC+ compatibility with Juicebox (modified 0 times) jbfan
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2) soldered socket to *pins* on juiceware cart connector, according to this image: http://www.elinux.org/Image:Mmcschematic.jpg - I did *not* remove the juiceware connector
Does this mean that the wires are inside the Juicebox (as opposed to on a Juiceware cart)? If so make sure you identified the correct end of the connector as pin 1, it's nearest the power switch. (wiki page)
You should not need to remove the connector.
5) inserted the card into the socket soldered to the Juicebox and booted to diagnostic screen
6) ran mem test - result: SD card not found
7) took out the MMC+ card, and inserted a juiceware cart into the juiceware connector
8) booted normally - result: video played fine
If the MMC socket is wired to the JB try running the mem test with both MMC and a Juiceware plugged in. If the JB fails to see the Juiceware cart that may indicate a problem with the MMC wiring.
As I previously mentioned, there are connections on the MMC+ card that are left floating.
There should not be any issues with that, I'm using a SD/MMC+ (actually it's a "Plus" I assume that is the same as "+") with the "MP3 kit" that only has the same 6 connections.

If you can get your hands on one try another MMC (plus or regular) card. Can't find the reference but I think that others have found some cards just won't work with the JB.

-J

05-23-2007 18:46:24

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