2016-06-11 22:13:39 +02:00
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system/usbmsc
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^^^^^^^^^^^^^^^
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This add-on registers a block device driver, then exports the block
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the device using the USB storage class driver. In order to use this
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add-on, your board-specific logic must provide the function:
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void board_usbmsc_initialize(void);
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This function will be called by the system/usbmsc indirectly via the
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boarctl BOARDIOC_USBDEV_CONTROL command in order to do the actual
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registration of the block device drivers. For examples of the
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implementation of board_usbmsc_initialize() see
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configs/mcu123-lpc124x/src/up_usbmsc.c or
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configs/stm3210e-eval/src/usbmsc.c
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Configuration options:
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CONFIG_NSH_BUILTIN_APPS
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This add-on can be built as two NSH "built-in" commands if this option
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is selected: 'msconn' will connect the USB mass storage device; 'msdis'
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will disconnect the USB storage device.
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CONFIG_LIB_BOARDCTL
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Enables the boardctl() interfaces.
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CONFIG_BOARDCTL_USBDEVCTRL
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Enables the BOARDIOC_USBDEV_CONTROL boardctl() command.
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CONFIG_SYSTEM_USBMSC_NLUNS
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Defines the number of logical units (LUNs) exported by the USB storage
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driver. Each LUN corresponds to one exported block driver (or partition
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of a block driver). May be 1, 2, or 3. Default is 1.
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CONFIG_SYSTEM_USBMSC_DEVMINOR1
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The minor device number of the block driver for the first LUN. For
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example, N in /dev/mmcsdN. Used for registering the block driver. Default
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is zero.
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CONFIG_SYSTEM_USBMSC_DEVPATH1
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The full path to the registered block driver. Default is "/dev/mmcsd0"
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CONFIG_SYSTEM_USBMSC_DEVMINOR2 and CONFIG_SYSTEM_USBMSC_DEVPATH2
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Similar parameters that would have to be provided if CONFIG_SYSTEM_USBMSC_NLUNS
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is 2 or 3. No defaults.
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CONFIG_SYSTEM_USBMSC_DEVMINOR3 and CONFIG_SYSTEM_USBMSC_DEVPATH3
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Similar parameters that would have to be provided if CONFIG_SYSTEM_USBMSC_NLUNS
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is 3. No defaults.
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CONFIG_SYSTEM_USBMSC_DEBUGMM
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Enables some debug tests to check for memory usage and memory leaks.
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If CONFIG_USBDEV_TRACE is enabled (or CONFIG_DEBUG_FEATURES and CONFIG_DEBUG_USB), then
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the code will also manage the USB trace output. The amount of trace output
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can be controlled using:
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CONFIG_SYSTEM_USBMSC_TRACEINIT
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Show initialization events
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CONFIG_SYSTEM_USBMSC_TRACECLASS
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Show class driver events
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CONFIG_SYSTEM_USBMSC_TRACETRANSFERS
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Show data transfer events
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CONFIG_SYSTEM_USBMSC_TRACECONTROLLER
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Show controller events
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CONFIG_SYSTEM_USBMSC_TRACEINTERRUPTS
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Show interrupt-related events.
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Error results are always shown in the trace output
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NOTE 1: When built as an NSH add-on command (CONFIG_NSH_BUILTIN_APPS=y),
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Caution should be used to assure that the SD drive (or other storage device) is
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not in use when the USB storage device is configured. Specifically, the SD
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driver should be unmounted like:
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nsh> mount -t vfat /dev/mmcsd0 /mnt/sdcard # Card is mounted in NSH
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...
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nsh> umount /mnd/sdcard # Unmount before connecting USB!!!
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nsh> msconn # Connect the USB storage device
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...
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nsh> msdis # Disconnect USB storate device
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nsh> mount -t vfat /dev/mmcsd0 /mnt/sdcard # Restore the mount
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Failure to do this could result in corruption of the SD card format.
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NOTE 2: This add-on used internal USB device driver interfaces. As such,
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it relies on internal OS interfaces that are not normally available to a
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user-space program. As a result, this add-on cannot be used if a
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NuttX is built as a protected, supervisor kernel (CONFIG_BUILD_PROTECTED
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or CONFIG_BUILD_KERNEL).
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