Additional patches from Petteri Aimonen for FAT, STM32 SPI, and AT25

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5593 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 7 insertions, 3 deletions

diff --git a/nuttx/drivers/mmcsd/mmcsd_spi.c b/nuttx/drivers/mmcsd/mmcsd_spi.c
index d437b7fea..3d4cf1dd1 100644
--- a/nuttx/drivers/mmcsd/mmcsd_spi.c
+++ b/nuttx/drivers/mmcsd/mmcsd_spi.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * drivers/mmcsd/mmcsd_spi.c
  *
- *   Copyright (C) 2008-2010, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2008-2010, 2011-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -409,10 +409,14 @@ static uint32_t mmcsd_sendcmd(FAR struct mmcsd_slot_s *slot,
   int ret;
   int i;
 
-  /* Wait until the card is not busy */
+  /* Wait until the card is not busy.  Some SD cards will not enter the IDLE
+   * state until CMD0 is sent for the first time, switching the card  to SPI
+   * mode.  Having a pull-up resistor on MISO may avoid this problem, but
+   * this check makes it work also without the pull-up.
+   */
 
   ret = mmcsd_waitready(slot);
-  if (ret != OK)
+  if (ret != OK && cmd != &g_cmd0)
     {
       return ret;
     }