SDSS ????
Posted by Sublime
I am trying to connect a generic SD breakout board to use with Marlin and the firmware (and tutorials ) all call for SDss to be connected to pin 53. But pinouts.ru and google can not tell me which pin from the SDcard is SDss. Anyone know?
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Re: SDSS ???? April 07, 2012 04:11AM |
Admin Registered: 17 years ago Posts: 7,879 |
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Re: SDSS ???? April 07, 2012 07:09AM |
Registered: 13 years ago Posts: 2,947 |
If I am reading that correctly it says its the Card select line but the pin.h file and this tutorial [tommyc-reprap.blogspot.ca] have the card select going to pin 42 and this mystery one connected to pin 53.
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Re: SDSS ???? April 07, 2012 08:55AM |
Admin Registered: 17 years ago Posts: 7,879 |
My understanding is 42 is the card detect signal, which is via the extra wire. 53 is the card select signal which is pin 1 on the actual card.
[www.hydraraptor.blogspot.com]
[www.hydraraptor.blogspot.com]
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Re: SDSS ???? April 07, 2012 04:25PM |
Registered: 13 years ago Posts: 2,947 |
Ok I think I understand now. The card select pin is a function of the SD card itself (flow control?). And the Card detect pin is a function of the card slot and not the card itself.
Thanks for your help.
Thanks for your help.
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Re: SDSS ???? April 07, 2012 06:34PM |
Admin Registered: 17 years ago Posts: 7,879 |
Yes that's right. The card select is used for framing. The data bytes in the SPI transfer are aligned to the card select. Without it it would be ambiguous where one byte ends and the next one starts.
Edited 1 time(s). Last edit at 04/07/2012 06:55PM by nophead.
[www.hydraraptor.blogspot.com]
Edited 1 time(s). Last edit at 04/07/2012 06:55PM by nophead.
[www.hydraraptor.blogspot.com]
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