FAT16 Problem

thenorthstar · Joined: 06 Mar 2010 Posts: 24

hello my friend;
I tried the following program I tried it with 18f4620 .
I'm using 256 MB SD Card.
Proteusta running smoothly, but I did the circuit does not work.

Is the SD Card files, but gives the following warning when I open the files on the PC.

I could not find where I'm wrong. Can you help? Please

My Code:
http://www.4shared.com/file/ZTNDdooy/SD_Fat16.html

Nepersky · Joined: 10 May 2011 Posts: 15

I am not really sure, but I think you only have a pull-up resistor on the Dout pin of your SD card. Am I right?
When I built my last SD card circuit I also had pull-ups on Din and CS lines.

thenorthstar · Joined: 06 Mar 2010 Posts: 24

Please help me

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

I think asmallri told you to look at sample schematics on his web page.
You should do it. Look at the circuit at the bottom center of the
schematic. He has voltage dividers consisting of 1.8K / 3.3K resistors
going to the \CS, SCK, and DI pins on the SD card. Then he as a 15K
pullup and a 74ACT125 connected to DO on the SD card. (You can also
use 74AHCT125). Here is the schematic from his page:
http://www.smallridge.com.au/download/BE_Reference_Design_PIC18F2620_ENC28J60.zip

thenorthstar · Joined: 06 Mar 2010 Posts: 24

Is the SD card connection is the problem?

PCM programmer · Joined: 06 Sep 2003 Posts: 21708