More Kinetis SDHC fixes

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3907 42af7a65-404d-4744-a932-0658087f49c3

configs/twr-k60n512/src/up_nsh.c

@@ -174,12 +174,13 @@ static void kinetis_mediachange(void)
       sdhc_mediachange(g_nsh.sdhc, inserted);
 
       /* If the card has been inserted, then check if it is write protected
-       * aw well.
+       * as well.  The pin is pulled up, but apparently logic high means
+       * write protected.
        */
 
       if (inserted)
         {
-          sdhc_wrprotect(g_nsh.sdhc, !kinetis_gpioread(GPIO_SD_WRPROTECT));
+          sdhc_wrprotect(g_nsh.sdhc, kinetis_gpioread(GPIO_SD_WRPROTECT));
         }
     }
 }