SD card on paneDue 7" not reading
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Everything else works fine.
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All the other functions of PanelDue use just the 4-core cable. Only the SD card uses the ribbon cable.
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Not sure if you can see the picture, but the ribbon cable, two of them that I have tried, is correct. Both with an overall length of 400mm.
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I'm sorry, the picture won't display on the tablet that I am typing this on.
Does the SD card read OK in a PC?
If we rule out the ribbon cable and the SD card, then the problem could be with the Duet, the PanelDue controller, or the TFT panel assembly including the socket and the 3.3V regulator chip. Unfortunately it's hard to pin it down to one of those components without either an oscilloscope or a second set of those 3 parts to swap in. The PanelDue is least likely to be at fault if the solder joints on the ribbon cable connector and the display connector look ok, because all it does is to connect them together.
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Yes, the SD card is good and used in other computers. Even tried a format for Ss&Gs. I will give everything a good looking over when this print job is up and we can go from there. Thanks for the help.
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I had similar problems with getting my second SD card to work when I first hooked it up. I do want to say up front that I am not using the SD card socket on the panel due as it was not in a convenient location given the way I ended up designing the enclosure for my Lcd, I have a external SD card slot breakout board. Nevertheless I do think what I did may help. From my looking into this issue this most recent go around and with my last 3d printer where I had similar issues, I found that the problem was ribbon cable length. It wasn't so much that it was too long, its was more about it being the correct length in the range of the length I needed for my application. From what I have read online it's something along the lines of signal reflection or something like that I think is was is happening. Both times I ended up shorting the cable by about 10mm and then it worked properly. If your are able to crimp ribbon cables give it a go and see if it works, you may need to shorten it a couple of times to get it working.
As a side note I saw an app note from a manufacturer, can't remember which one, that said for long length spi communications differental signaling should be used, the same type as rs422. That would require an active converter ic at each end of the cable, maybe some day I will get around to designing a board and try it out.
