SD Card SDR12 mode?

[mspenard603]

Hi All,

 How do I force the SD driver to use SDR12? I see "kSD_TimingSDR12DefaultMode" for setting the pin config dynamically etc. But how do I control what mode SD is using overall?

Actually, the card being on a bread-board, I'd like to run the driver as slow as possible. Is it possible to keep at 400khz?

[kerryzhou]

Hi Mike Spenard ,

   Do you use the uSDHC module, and want to work under SDR12 mode, is it right?

  Not boot the code from the SD card with SDR12?

Have a great day,
Kerry

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[mspenard603]

Right... fsl_sd.h etc etc.

[kerryzhou]

Hi Mike,

   Sorry for my later reply.

   If you want to know how to enter the SDR12 mode, you need to know the UHS-I command sequence at first, and know the SD cord working flow. SDR12 is in the UHS-I mode.

About the UHS-I command sequence, you can check this document, which I searched it from the google.

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwig0KztxeDjA... 

  Page 35:

So, you can follow the above command sequence to enter the SDR12 mode.

You can learn it at first. About the clock, you also can configure your expected clock for the SD clock.

Wish it helps you!

Have a great day,
Kerry

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