Questions re embedding MMC/SD (and digital cameras)

I can't anwser for the second part of your question but for the first part, I did it this way on our new micro board.

I use an SD card connector with MMC interface. I have not do any testing at this time but I will do next week.

If you want, I can confirm you when I finish testing.

Jocelyn

"Lewin A.R.W. Edwards" a écrit dans le message de news: snipped-for-privacy@posting.google.com...

Hi Jocelyn,

Great, thanks for the feedback. I've got Sandisk's docs and it seemed like this was possible, but I wasn't sure.

I'm going to ask someone with an SD-supporting camera to fill a card with images and send it to me. I can't imagine why they would want to use crypto, but you never know...

Hi:

I've read some documents from sandisk etc. The main difference i found besides encryption is that SD is faster than MMC.

Greetings

Hi,

SD can be operated in MMC mode which is fully compatible in spite of initialization which differs slightly in one command. I do not remember the details, if needed i must check the sources.

snipped-for-privacy@larwe.com (Lewin A.R.W. Edwards) wrote in news: snipped-for-privacy@posting.google.com:

Yes. That's exactly what I'm doing on a project I'm wrapping up right now. Our hardware uses a SD connector (the connector has a card detect switch, and it senses the SD's write protect switch too), and I can read/write MMC and SD cards in SPI mode.

I wish I could answer your question. On my project, I could only read the contents of cards that I formatted in my embedded project. We couldn't read from cards directly out of the package, or when formatted as "FAT" (not FAT32) in Windows XP. I wish I had more time to investigate the problem. I am using the uC/FS filesystem from Micrium to access the cards. It took me quite awhile to finally be able to read from or write to the card, but it was not the fault of the uC/FS code, which is well-written and highly portable C code.

- Scott B.