LPC3250 SD card interface

[shivshankar]

I am interfacing SD Card in LPC3250 processor, facing issue in command line.

1) SD Clock is configure to 196 KHZ and powered up then i am issuing command

2) On Command line

      - When SDMMC_IDLE(Put card in idle mode) command is sent the status register indicate the command is sent.
      - When MMC_SENDOP_COND(Send operating condition) command is sent the status register indicate timeout.

Problem: No command is sent Other than IDLE command. Status register indicate TIMEOUT i tried it for different SD clock rate from 190 to 320 kHZ.

Please respond any workaround?

[CarlosCasillas]

Hi,

Have you ensured that all the used pins are properly connected and on the correct voltage levels? You could take as reference the schematics, and BSP / Example Software of the 3rd party boards based on LPC3250, like the following:

https://www.embeddedartists.com/products/kits/lpc3250_kit.php

http://www.teamfdi.com/product-details/somdimm-lpc3250

Hope this will be useful for you.
Best regards!
/Carlos
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------