SD card 4 bit mode

[chobin]

Hi everyone,

I'm developing a project where i'm using kinetis K20 microcontroller where I need to improve the SD card speed communication. Now it's working in 1 bit mode.

Did someone use SD card in 4 bit mode? I tried to develop the SDHC.c file using processor expert 10.2 where I selected 4 bit mode, but the SD card speed doesn't increase.

Does someone help me to start this 4 bit mode?

If I want to switch from SDHC mode to SPI mode, how I can do it?

Many thanks for your support.

Best regards,

Stefano

[jeremyzhou]

Hi Chobin,

I'd like to share a project about Fat File System for SD card using SPI for K20.

The link as below.

Sd-Card Fat file system Project for Freescale Kinetis.rar
Have a great day,
Ping

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