LPC3250 SD card interface

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LPC3250 SD card interface

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Contributor I

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?

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1 Reply

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NXP Employee
NXP Employee

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
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