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Hans Wedemeyer
Joined: 15 Sep 2003
Posts: 226
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| MMC or CF memory ? |
 Posted: Fri Apr 09, 2004 4:51 pm |
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New project requires a lot of storage.
The CF card seems easy enough to use, but the hardware has 50 pins and can become an assembly nightmare.
The MMC card looks a lot better with regards hardware.
Has anyone used the MMC card in SPI mode ?
Appreciate a few tips ... |
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Hans Wedemeyer
Joined: 15 Sep 2003
Posts: 226
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| Douglas Kennedy |
| Posted: Sun Apr 11, 2004 9:10 pm |
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Not sure if the private message thing is working...
Thanks for the help.
hansw |
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Pete Smith
Joined: 17 Sep 2003
Posts: 55
Location: Chester, UK
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| Re: MMC or CF memory ? |
| Posted: Mon Apr 12, 2004 5:09 am |
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| Hans Wedemeyer wrote: | New project requires a lot of storage.
The CF card seems easy enough to use, but the hardware has 50 pins and can become an assembly nightmare.
The MMC card looks a lot better with regards hardware.
Has anyone used the MMC card in SPI mode ?
Appreciate a few tips ... |
Seemed to miss this posting last weel.
Yes, I've used MMC card in SPI mode. Seems to work perfectly.
There was code posted on here a while ago which showed how to use an MMC card as flat storage (a search should bring it up).
All I can say is that I only managed to get it to work by initialising the card and _then_ checking its ID's. Until I did this, it wouldn't function fully.
Can't really say more than that, because I didn't have a great deal of trouble making it work.
I'm actually soak-testing an MMC storage system right here, now. Sampling at 1000 times a second onto a FAT16 formatted card. I'm hoping it's going to fill the card up, and then beep to say "Card full" rather than "Why is there no space left!".
Pete. |
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horizontech
Joined: 09 Nov 2003
Posts: 13
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| Posted: Mon Apr 12, 2004 11:44 am |
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HI !
I looking to use a MCC or SD card ad data storage
What is the speed rate for write in MMC card in SPI mode ?
Where a can find specification for SPI mode ?
I am interest to buy if you have a Prebuild library for use in CCS Compiler ! for SPI SD CARD
Thanks
Alain Tanguay |
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Guest
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| Thankls |
| Posted: Mon Apr 12, 2004 8:36 pm |
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| horizontech wrote: | HI !
I looking to use a MCC or SD card ad data storage
What is the speed rate for write in MMC card in SPI mode ?
Where a can find specification for SPI mode ?
I am interest to buy if you have a Prebuild library for use in CCS Compiler ! for SPI SD CARD
Thanks
Alain Tanguay |
Thanks for the input. I also recieved some private help.
The project must work at -40oC ! and I'm finding only SD cards rated at -20oC !
I want to avoid the CF cards (which are rated at -40oC) becasue of the assembly hassles.
Good luck with your project.
Hans W |
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