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Altera_Forum's avatar
Altera_Forum
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14 years ago

SD card problem in NEEK

hi all,

i am new in altera tools and i use in my project NIOS || Embedded Evalution Kit (NEEK)

here is the link for the kit for more details:http://www.altera.com/products/devkits/altera/kit-cyc3-embedded.html

i wanna connect my sopc builder system with SDCard i.e. i wanna to read and write from SDCard on the second board : lcd_multimedia _Hsmc,

SDCard can work in two modes which are 1-SPI mode 2-SD mode

i will make SDCard to work in SPI mode so i am going to use SPI core in SOPC to connect SDCard with.

After i make connection between SPI master on FPGA and SDCard on second board i try to write driver for SDCard using altera Apis for SPI

Note:SDCard need chip select signal can be drived low.

so i need more details about ss_n signal from SPI so as to use it to connect with SDCard "CS"

if someone tried like this project please help me in this problem

thanks in advance

1 Reply

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

    also when i try to write zero in slave select register and try to read it to make sure from that

    i found it 1

    IOWR_ALTERA_AVALON_SPI_SLAVE_SEL(sd_hardware->spi_controller_base,0);

    slave=(unsigned char)IORD_ALTERA_AVALON_SPI_SLAVE_SEL(sd_hardware->spi_controller_base);

    i found that slave =1 not 0

    please help me in this problem

    thanks in advance