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yviswanathbe
Joined: 14 Jun 2007
Posts: 61
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 11 Aug 2008 5:53 help needed for memory card? |
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Hi,
I need a help in memory card(1GB) with spi interfacing.
I want to store values displaying in the voltmeter continuously in the memory(i have choosen memory card) till i complete the measurements.
After measurement has been completed i will be connecting this menory card to the PC and i will be retreiving values which are stored in the memory card.This is my idea.
can anybody suggest me some memory cards with spi interfacing
or
memory chips (with upto 1GB storage capacity) which is compatible with spi interfacing.
Thanks & Regards,
viswanath
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Eugen_E
Joined: 29 Nov 2004
Posts: 326
Helped: 30
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| 11 Aug 2008 19:51 Re: help needed for memory card? |
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SD cards or MMC cards can be interfaced on SPI.
Use a microcontroller and implement or use a library for FAT16 or FAT32. You can create a file, and write values. The file can be readed from the card on PC.
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yviswanathbe
Joined: 14 Jun 2007
Posts: 61
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| 12 Aug 2008 5:17 Re: help needed for memory card? |
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Hi,
Thanx 4 Replying.
Can we directly interface the card to the microcontroller r we need any support controllers we need put in between Microcontroller and card.
Can you suggest me some companies who sells these types of cards(SD or MMC).
I googled some(SANDISK etc) but i dint find the datasheets.
n
libraries (FAT32 r FAT64) for microcontroller ,how to start implementing?give me some idea.....
Thanx & Regards,
viswanath.
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Eugen_E
Joined: 29 Nov 2004
Posts: 326
Helped: 30
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yviswanathbe
Joined: 14 Jun 2007
Posts: 61
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| 13 Aug 2008 5:26 Re: help needed for memory card? |
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Hi,
Thanks for your valuable information.
One more thing where can we get connectors for these cards?(i mean mating slots to insert these cards).
provide me some vendors list.
I am planing to go for Sandisk SD card?
Give me suggesions.
Thanks In Advance.
Regards,
Viswanath.
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ckshivaram
Joined: 21 Apr 2008
Posts: 327
Helped: 22
Location: india
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| 13 Aug 2008 8:22 Re: help needed for memory card? |
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| u can interface the memory card u use in mobile to interface with controller. or u can u SD card also to store the data. better you interface it to 32 bit controller, as 8bit will not be that fast when u try to read the contents of the card. In long run 8 bit controller fails.
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yviswanathbe
Joined: 14 Jun 2007
Posts: 61
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| 19 Aug 2008 5:01 Re: help needed for memory card? |
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Thanks Shiva,
I am going to use Silabs C8051F005(8-bit controller),Because my application is to measure and store the value.
I want to interface SD card or MMC Card to the above Microcontroller.
Do all the SD cards used in the mobile suports SPI interfacing?
I have seen SANDISK & TRANSCEND SD cards available in the market?
Can i use these cards to interface with microcontroller(My Controler is silabsC8051F005, it supports SPI,I2C)?
Where can i get the Technical datasheets for these cards?
Please Suggest me.
Thanks in advance.
Regards,
Viswanath.
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ckshivaram
Joined: 21 Apr 2008
Posts: 327
Helped: 22
Location: india
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| 19 Aug 2008 5:41 help needed for memory card? |
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SD cards briefly talk about their security features and the need to pay the "Secure Digital People" for specs on the device and perhaps even some proprietary information on how to talk to the chip such that it will actually store and retrieve data.
So I suggest you to go for MMC card.
Go to Sandisk's website, and get the MultiMediaCard spec in the OEM
section. Develop your software against the MMC spec. If your
software follows the MMC spec, it will talk to an SD card without
changes. You don't need to know anything about the security features,
and you don't need the SD card spec. The only difference will be that
you'll need an SD-compatible slot, since the SD card is thicker.
http://www.sandisk.com/pdf/oem/ProdManualSDCardv1.9.pdf Sandisk SD card product manual
http://www.sandisk.com/pdf/oem/ProdManualminiSDv1.1.pdf MiniSD card
http://www.sandisk.com/download/Product%20Manuals/Product%20ManualSDCardv1.7.pdf Older SD card
specs
Using SDCard and SDIO with the Intel? PXA250 MMC Controller Application Note
http://www.intel.com/design/pca/applicationsprocessors/applnots/278533-001.htm
Toshiba SD card specification
http://i.cmpnet.com/chipcenter/memory/images/prod055.pdf
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