Re: CF Driver for AVR

Aug 17, 2003 8 Replies
M


I need to plug in a CF card to an ATMega128 design. Does anyone know the


>best way to go about this, or at least the best place to start looking?

There are many open projects available in the internet that connect CF's to microcontrollers. A good source is i.e. one of the application notes from SanDisk which showes several ways to do this.


In short, it boils down to connecting A0-A2 D0-D7 /IOR, /IOW and /CS and following the protocol specs available from

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The only potential difficulty is to make sure that the timeing requierements form the CF are met and that the lines to the CF are reasonably short.


HTH


Markus

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A

the

looking?

ethernut look on the hardware page

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or edtp.com 's ide interface

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Also think I saw a project for this on avrfreaks.com but I may be wrong.

Alex

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W

I'll recomand to use a MMC card. They are SPI compatible.

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J

Where is the interface spec for MMC?

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D

Fred Eady did an ATA hard drive controller design using the ATmega128 in the January 2003 issue of Circuit Cellar. The article is on-line at:

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Regards David Milne
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"

Isn't CF basically IDE interface? Still works in 8-bit mode?

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M

Basically yes. IDE used to work with 8 bit too. Problem these days is that you no longer find drives that can do it. CF cards however do support 8 bit mode which makes perfectly sense considering that they are most often used in embedded devices.

Markus

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S

As far as I know, IDE works in 8 bit software mode. I.e. just ignore the high byte. CF works in 8 bit hardware mode. You have to enable it with a hardware signal. In another word, can't do 8 bit IDE-CF.

IDE Compact Flash Drive

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E

CF work with True-IDE with 8 bits without hardware signal. by sending Set Feature Command ( EF h) Feature Register (01 h) : turn on 8 bits IDE Mode Feature Register (81 h) : turn off 8 bits IDE Mode

If You have the CF specification on your hand, you can take a look on Set Feature Command.

"Sales for IDE-CF flash drive" ??? news: snipped-for-privacy@posting.google.com ???...

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