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SD card 4 bit mode

Question asked by chobin on Mar 12, 2014
Latest reply on Oct 6, 2015 by chobin


I'm developing an application software for kinetis K20. This application copeis pictures from a USB key to a SD card (class 4).

The final result is very slow, so I decided to enable the SD card 4 bit mode to improve the transfer speed. I tried to do it, but the application doesn't work when it writes a data block.

Please note that the SD code has been generated by processor expert version 10.2.

Does someone activated the 4 bit mode interface of SD card using a kinetis microcontroller? Does it work correctly?

Thank you in advance for your help.