Problem with reading proper sector of Compact Flash card

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Hildebrandt

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Compact Flash problems

I having an odd problem with interfacing to compact flash card.
The Identify command works perfictly.
The Read sector command seems to work except that the sector I read does not seem to be correct.

For exampel if I set the
Sector number 20h,
Cyl Low to 0
Cyl High to 0
Head to E0h (I'm using LBA mode)

With these setting I would expect to get sector 32 (20h) but I get sector 0 here (boot sector)

So far I have not been able to do any writes.
Anyone have any ideas what's going on?

Hildebrandt
 

Re: Compact Flash problems

Try _http://www.armanet.com/index.html
Select "Engineering Resources", there's PIC source code available there.
 

Re: Compact Flash problems

Just a quick update, I now can write data to the card. I found a bug in my code.

Hildebrandt
 

Re: Compact Flash problems

Oh well looks like I'm going to answer my own question, just in case anyone else is interested. The data I was looking at sector 0 is not the boot block but the master boot record which has the partition information. This information included the location of the the boot sector. Now I know, now you know.

H.
 

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