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SD/MMC Read Problem

 
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mbro131



Joined: 22 May 2006
Posts: 9

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SD/MMC Read Problem
PostPosted: Fri Jun 02, 2006 12:07 am     Reply with quote
I am having a problem reading from an SD card. It seems to initialise OK, and doesn't return any errors when writing to the card (although as I can't read I havn't been able to confirm this).

The basic structure of the read code is as follows:

Code:
Command(CMD17,0,512,0xFF); // returns 0x00 (no error)
spi_read(0xFF); // returns 0x03 // what does this mean??
spi_read(0xFF); // returns 0xFF
spi_read(0xFF); // returns 0xFF
spi_read(0xFF); // returns 0xFF
...(forever more)
spi_read(0xFF); // returns 0xFF


I have no idea why it is reading 0x03.. and never getting to 0xFE
Edit: 0x03 indicates an 'Internal Card Controler Error". I dont know why I am getting this error.

If anyone can shed any light on this problem it would be appreciated

Matt
mbro131



Joined: 22 May 2006
Posts: 9

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PostPosted: Fri Jun 02, 2006 1:57 am     Reply with quote
Update: I still dont know what the error is, but i found that if I remove the write block I have prior to the read then the error is removed.. This suggests that my write block has some issues..

I'll post back if I find out for sure what this is.

Matt
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