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Forum Index : Microcontroller and PC projects : Error: Cannot access the SD card.

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Grogster

Admin Group

Joined: 31/12/2012
Location: New Zealand
Posts: 9586
Posted: 03:19pm 14 Mar 2013
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This one is interesting.

chdir .. from the root generates this error.

I discovered it when I was trying to switch to the root, when I forgot I was already there!

However, the error message threw me for a while, until I remembered that I WAS already in the root, so could ignore the message, but I would have thought that a chdir .. at the root would just have given me a > prompt on the next line.

Does not bother ME, but thought I would mention it.
Smoke makes things work. When the smoke gets out, it stops!
 
Juri74

Senior Member

Joined: 06/02/2012
Location: Italy
Posts: 162
Posted: 06:56am 15 Mar 2013
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  Grogster said  chdir .. from the root generates this error.


Tested, it generate error on my maximite tooEdited by Juri74 2013-03-16
 
jeffjones
Newbie

Joined: 14/11/2011
Location: Australia
Posts: 1
Posted: 06:18pm 19 Dec 2014
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I have had my B/W maximite for a few years now, I am just getting back into it
I am having problems with unable to read sd card I have double checked all conns for O/C and shorts. I put the scope on the clock pulse output at the card and there is nothing .Everything else is working fine. I replaced the chip a long time ago and it has worked since then . I suspect I overheated something as I had a few problems.
My question is can I use the keyboard clock pulse at pin 54 or alternatively knock up a divider from the Chrystal . I imagine that the frequency and voltage needs to be specific . I will change the chip if I have to
thanks in advance. Jeff
 
Geoffg

Guru

Joined: 06/06/2011
Location: Australia
Posts: 3282
Posted: 02:00am 20 Dec 2014
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  jeffjones said   I have had my B/W maximite for a few years now, I am just getting back into it
I am having problems with unable to read sd card I have double checked all conns for O/C and shorts. I put the scope on the clock pulse output at the card and there is nothing .Everything else is working fine. I replaced the chip a long time ago and it has worked since then . I suspect I overheated something as I had a few problems.
My question is can I use the keyboard clock pulse at pin 54 or alternatively knock up a divider from the Chrystal . I imagine that the frequency and voltage needs to be specific . I will change the chip if I have to
thanks in advance. Jeff

No, the clock needs to be generated by the SPI peripheral in the PIC3 - you cannot synthesise it. Perhaps you did not solder that pin correctly.

  Grogster said  chdir .. from the root generates this error.

It should generate an error as you are trying to go up from root and there is no parent directory to go to. However, I agree that the message is confusing.Edited by Geoffg 2014-12-21
Geoff Graham - http://geoffg.net
 
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