Add USB host support for the STM3240G-EVAL board

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5069 42af7a65-404d-4744-a932-0658087f49c3

configs/stm3240g-eval/README.txt

@@ -853,7 +853,7 @@ STM3240G-EVAL-specific Configuration Options
      want to do that?
    CONFIG_STM32_USBHOST_REGDEBUG - Enable very low-level register access
      debug.  Depends on CONFIG_DEBUG.
-    CONFIG_STM32_USBHOST_PKTDUMP - Dump all incoming and outgoing USB
+   CONFIG_STM32_USBHOST_PKTDUMP - Dump all incoming and outgoing USB
      packets. Depends on CONFIG_DEBUG.
 
 Configurations
@@ -1028,8 +1028,67 @@ Where <subdir> is one of the following:
        CONFIG_STM32_OTGFS     - Enable the STM32 USB OTG FS block
        CONFIG_STM32_SYSCFG    - Needed
        CONFIG_SCHED_WORKQUEUE - Worker thread support is required
- 
-    9. This configuration requires that jumper JP22 be set to enable RS-232
+
+    9. USB OTG FS Host Support.  The following changes will enable support for
+       a USB host on the STM32F4Discovery, including support for a mass storage
+       class driver:
+
+       CONFIG_USBDEV=n          - Make sure tht USB device support is disabled
+       CONFIG_USBHOST=y         - Enable USB host support
+       CONFIG_STM32_OTGFS=y     - Enable the STM32 USB OTG FS block
+       CONFIG_STM32_SYSCFG=y    - Needed for all USB OTF FS support
+       CONFIG_SCHED_WORKQUEUE=y - Worker thread support is required for the mass
+                                  storage class driver.
+       CONFIG_NSH_ARCHINIT=y    - Architecture specific USB initialization
+                                  is needed for NSH
+       CONFIG_FS_FAT=y          - Needed by the USB host mass storage class.
+
+       With those changes, you can use NSH with a FLASH pen driver as shown
+       belong.  Here NSH is started with nothing in the USB host slot:
+
+       NuttShell (NSH) NuttX-x.yy
+       nsh> ls /dev
+       /dev:
+        console
+        null
+        ttyS0
+
+       After inserting the FLASH drive, the /dev/sda appears and can be
+       mounted like this:
+
+       nsh> ls /dev
+       /dev:
+        console
+        null
+        sda
+        ttyS0
+       nsh> mount -t vfat /dev/sda /mnt/stuff
+       nsh> ls /mnt/stuff
+       /mnt/stuff:
+        -rw-rw-rw-   16236 filea.c
+
+       And files on the FLASH can be manipulated to standard interfaces:
+
+       nsh> echo "This is a test" >/mnt/stuff/atest.txt
+       nsh> ls /mnt/stuff
+       /mnt/stuff:
+        -rw-rw-rw-   16236 filea.c
+        -rw-rw-rw-      16 atest.txt
+       nsh> cat /mnt/stuff/atest.txt
+       This is a test
+       nsh> cp /mnt/stuff/filea.c fileb.c
+       nsh> ls /mnt/stuff
+       /mnt/stuff:
+        -rw-rw-rw-   16236 filea.c
+        -rw-rw-rw-      16 atest.txt
+        -rw-rw-rw-   16236 fileb.c
+
+       To prevent data loss, don't forget to un-mount the FLASH drive
+       before removing it:
+
+       nsh> umount /mnt/stuff
+
+    11. This configuration requires that jumper JP22 be set to enable RS-232
        operation.
 
   nsh2: