MSP430FR5969 SD interface

Hi Nadhish,

My advise is

1. You should have to interface the MMC (if you can get one) card before SD card.

2. other wise interface SD card less than 2 GB requires some more CMD commands then MMC.

3. Above 2GB (4gb , 8gb )there are more & complex CMD ( APCMD = 0X80+CMD ) commands are required.

4. thus first interface 2GB card (if not mmc) and then make some changes and interface card above 2GB

Good Luck.

Regards,

Dharmendra Sharma

INDIA

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Hi All,

I will have to interface an SD card with MSP430FR5969 soon as well. Did you guys write your own code or did you use a library such as FatFS or PetitFat?

Thanks,
Nipun

Nipun,

if you really wanna learn how SD works... and all its internal architecture then 

follow the tutorial link..

http://codeandlife.com/2012/04/02/simple-fat-and-sd-tutorial-part-1/

Regards,

Dharmendra Sharma

INDIA

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Do, click "Verify Answer", if any of my replies helps solve your problem.

Dharmendra,

Thank you very much for the link, I will take a look at it!

- Nipun

SD cards above 4GB (HC standard) do not always support the MMC-compatible serial protocol. Some don’t. Also, like micro-SD below 4GB, they often do not support the MMC entry sequence and require the (slightly different) SD card sequence. (standard SD cards in standard or mini size support both).
Also, SDHC cards have a different interpretation of some of the information sector data (regarding capacity and block sizes), require asking for the supply voltage info register, and their read and write commands do not take a linear address, but a sector address (address parameter is not bit 0..31 but rather 9..41)

You can download the complete specifications from SanDisk.