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Altera_Forum's avatar
Altera_Forum
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10 years ago

Read a SD Card with a DE0.

Good Afternoom,

I would like to know, how i can access a card memory..

My application is very simple, i want to read a text stored in the card memory, Perform a function with string and store the new string in the card in a different file.

But i am new in this world of fpga and vhdl, someone can help me?

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    10 years ago

    Altera university program offers an sd card IP controller in spi mode. Is that good for you? If you want a faster communication protocol - like 4 wire - then you need to create your own sd card controller or buy a license for a premade core (the SD card communication protocol is really complicated). Additionally, to read txt files you need to have a FAT file system interpreter in your C code.

    I've been working on an open source 4 wire sd card controller (http://www.alteraforum.com/forum/showthread.php?t=48229), its not complete yet. You can find open source FAT file system code as well and use it as part of your stack.