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.