topic Re: sdmmc_speed example in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/sdmmc-speed-example/m-p/588152#M21755 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by kiantek on Tue Sep 30 02:05:24 MST 2014</STRONG><BR /><SPAN>Problem solved by better control over SD_PWR. I've found this excellent post after thorough search.</SPAN><BR /><BR /><SPAN>"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."</SPAN><BR /><BR /><SPAN>by NXP_Support on 2014-07-29 10:42</SPAN><BR /><SPAN><A class="jive-link-external-small" href="https://community.nxp.com/external-link.jspa?url=http%3A%2F%2Fwww.lpcware.com%2Fcontent%2Fforum%2Fsdcard-mci-interface-lpcopen" rel="nofollow" target="_blank">http://www.lpcware.com/content/forum/sdcard-mci-interface-lpcopen</A></SPAN><BR /><BR /><SPAN>Enjoy coding.</SPAN></BODY></HTML> Wed, 15 Jun 2016 19:15:14 GMT lpcware 2016-06-15T19:15:14Z sdmmc_speed example https://community.nxp.com/t5/LPC-Microcontrollers/sdmmc-speed-example/m-p/588150#M21753 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by toad on Fri Mar 21 14:14:16 MST 2014</STRONG><BR /><SPAN>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:</SPAN><BR /><BR /><SPAN>==============================</SPAN><BR /><SPAN>SDMMC CARD measurement demo</SPAN><BR /><SPAN>==============================</SPAN><BR /><BR /><SPAN>Wait till SD/MMC card inserted...</SPAN><BR /><BR /><SPAN>SD/MMC Card inserted...</SPAN><BR /><SPAN>SD/MMC Card enumeration failed! ..</SPAN><BR /><BR /><BR /><SPAN>On the other hand I can run the periph_sdmmc example which uses the file system interface and that one works correctly.</SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 19:15:13 GMT https://community.nxp.com/t5/LPC-Microcontrollers/sdmmc-speed-example/m-p/588150#M21753 lpcware 2016-06-15T19:15:13Z Re: sdmmc_speed example https://community.nxp.com/t5/LPC-Microcontrollers/sdmmc-speed-example/m-p/588151#M21754 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by kiantek on Mon Sep 29 09:18:46 MST 2014</STRONG><BR /><SPAN>I encountered the same problem on LPC1788 OEM board with LPCOpen. any kind heart could render some helps here?</SPAN><BR /><BR /><SPAN>I need an 8gb storage for data logging.</SPAN></BODY></HTML> Wed, 15 Jun 2016 19:15:14 GMT https://community.nxp.com/t5/LPC-Microcontrollers/sdmmc-speed-example/m-p/588151#M21754 lpcware 2016-06-15T19:15:14Z Re: sdmmc_speed example https://community.nxp.com/t5/LPC-Microcontrollers/sdmmc-speed-example/m-p/588152#M21755 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by kiantek on Tue Sep 30 02:05:24 MST 2014</STRONG><BR /><SPAN>Problem solved by better control over SD_PWR. I've found this excellent post after thorough search.</SPAN><BR /><BR /><SPAN>"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."</SPAN><BR /><BR /><SPAN>by NXP_Support on 2014-07-29 10:42</SPAN><BR /><SPAN><A class="jive-link-external-small" href="https://community.nxp.com/external-link.jspa?url=http%3A%2F%2Fwww.lpcware.com%2Fcontent%2Fforum%2Fsdcard-mci-interface-lpcopen" rel="nofollow" target="_blank">http://www.lpcware.com/content/forum/sdcard-mci-interface-lpcopen</A></SPAN><BR /><BR /><SPAN>Enjoy coding.</SPAN></BODY></HTML> Wed, 15 Jun 2016 19:15:14 GMT https://community.nxp.com/t5/LPC-Microcontrollers/sdmmc-speed-example/m-p/588152#M21755 lpcware 2016-06-15T19:15:14Z