SD card initialization commands.

paul andrei

I need some information (commands ) for a SD initialization through SPI.

I don't think that I am using the right commands.

These are the commands that I use:

- set clock to 400 kHz

- set CS=0

- delay 74 clocks

- set CS=1

- delay 16 clocks

- CMD0

- While (IDLE_STATE != 0)

{

- CMD41

- CMD55

}

- CMD58

0 milap patel over 13 years ago

reference document

http://www.ti.com/lit/an/spraao7/spraao7.pdf

0 paul andrei over 13 years ago in reply to milap patel

Hello,

I got this document, and also the functions but still doesn't work.

The answer from the SD card is 0xFF00.

0 Roberto Romano over 13 years ago in reply to paul andrei

Guru 27285 points

Hi Paul, that answer can be ok from SD card reading, 0x00ff you refer is a CRC return value or reading buffer filled with?

Regards

0 paul andrei over 13 years ago in reply to Roberto Romano

I mean the response from the SD card when I am trying to initialize it.

For the 1 Gb SD card the initialization works fine.

But for the 2 Gb card should I send different commands for initialization.

Regards.

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