sdmmc_speed example

[lpcware]

Content originally posted in LPCWare by toad on Fri Mar 21 14:14:16 MST 2014
I am trying to to run the sdmmc_speed example from the 2.09 LPC examples on the Hitex 43xx demo board with a 8G SDHC card and it prints the following out:

==============================
SDMMC CARD measurement demo
==============================

Wait till SD/MMC card inserted...

SD/MMC Card inserted...
SD/MMC Card enumeration failed! ..


On the other hand I can run the periph_sdmmc example which uses the file system interface and that one works correctly.

[lpcware]

Content originally posted in LPCWare by kiantek on Tue Sep 30 02:05:24 MST 2014
Problem solved by better control over SD_PWR. I've found this excellent post after thorough search.

"It was discovered that the MCIPWRAL bit in the SCS (System Controls and Status register) powers up with random polarity. The result being that the polarity of the SD_PWR output becomes inverted. The MCIPWRAL bit needs to be explicitly cleared to force active low polarity of SD_PWR on these boards."

by NXP_Support on 2014-07-29 10:42
http://www.lpcware.com/content/forum/sdcard-mci-interface-lpcopen

Enjoy coding.

[lpcware]

Content originally posted in LPCWare by kiantek on Mon Sep 29 09:18:46 MST 2014
I encountered the same problem on LPC1788 OEM board with LPCOpen. any kind heart could render some helps here?

I need an 8gb storage for data logging.