system/composite
^^^^^^^^^^^^^^^^^^
This logic adds a NSH command to control a USB composite device. The only
supported devices in the composite are CDC/ACM serial and a USB mass storage
device. Which devices are enclosed in a composite device is configured with
an array of configuration-structs, handed over to the function
composite_initialize().
Required overall configuration:
Enable the USB Support of your Hardware / Processor e.g. SAMV7_USBDEVHS=y
CONFIG_USBDEV=y - USB device support
CONFIG_USBDEV_COMPOSITE=y - USB composite device support
CONFIG_COMPOSITE_IAD=y - Interface associate descriptor needed
CONFIG_CDCACM=y - USB CDC/ACM serial device support
CONFIG_CDCACM_COMPOSITE=y - USB CDC/ACM serial composite device support
The interface-, string-descriptor- and endpoint-numbers are configured via the
configuration-structs as noted above. The CDC/ACM serial device needs three
endpoints; one interrupt-driven and two bulk endpoints.
CONFIG_USBMSC=y - USB mass storage device support
CONFIG_USBMSC_COMPOSITE=y - USB mass storage composite device support
Like the configuration for the CDC/ACM, the descriptor- and endpoint-numbers
are configured via the configuration struct.
Depending on the configuration struct you need to configure different vendor-
and product-IDs. Each VID/PID is unique to a device and thus to a dedicated
configuration.
Linux tries to detect the device types and installs default drivers if the
VID/PID pair is unknown.
Windows insists on a known and installed configuration. With an Atmel
hardware and Atmel-Studio or the Atmel-USB-drivers installed, you can test
your configuration with Atmel Example Vendor- and Product-IDs.
If you have a USBMSC and a CDC/ACM configured in your combo, then you can try
to use
- VID = 0x03EB (ATMEL)
- PID = 0x2424 (ASF Example with MSC and CDC)
If for example you try to test a configuration with up to seven CDCs, then
- VID = 0x03EB (ATMEL)
- PID = 0x2426 (ASF Example with up to seven CDCs)
CONFIG_NSH_BUILTIN_APPS
This add-on can be built as two NSH "built-in" commands if this option
is selected: 'conn' will connect the USB composite device; 'disconn'
will disconnect the USB composite device.
Configuration options unique to this add-on:
CONFIG_SYSTEM_COMPOSITE_DEBUGMM
Enables some debug tests to check for memory usage and memory leaks.
CONFIG_SYSTEM_COMPOSITE_NLUNS
Defines the number of logical units (LUNs) exported by the USB storage
driver. Each LUN corresponds to one exported block driver (or partition
of a block driver). May be 1, 2, or 3. Default is 1.
CONFIG_SYSTEM_COMPOSITE_DEVMINOR1
The minor device number of the block driver for the first LUN. For
example, N in /dev/mmcsdN. Used for registering the block driver. Default
is zero.
CONFIG_SYSTEM_COMPOSITE_DEVPATH1
The full path to the registered block driver. Default is "/dev/mmcsd0"
CONFIG_SYSTEM_COMPOSITE_DEVMINOR2 and CONFIG_SYSTEM_COMPOSITE_DEVPATH2
Similar parameters that would have to be provided if CONFIG_SYSTEM_COMPOSITE_NLUNS
is 2 or 3. No defaults.
CONFIG_SYSTEM_COMPOSITE_DEVMINOR3 and CONFIG_SYSTEM_COMPOSITE_DEVPATH2
Similar parameters that would have to be provided if CONFIG_SYSTEM_COMPOSITE_NLUNS
is 3. No defaults.
CONFIG_SYSTEM_COMPOSITE_TTYUSB - The minor number of the USB serial device.
Default is zero (corresponding to /dev/ttyUSB0 or /dev/ttyACM0). Default is zero.
CCONFIG_SYSTEM_COMPOSITE_SERDEV - The string corresponding to
CONFIG_SYSTEM_COMPOSITE_TTYUSB. The default is "/dev/ttyUSB0" (for the PL2303
emulation) or "/dev/ttyACM0" (for the CDC/ACM serial device).
CONFIG_SYSTEM_COMPOSITE_BUFSIZE - The size of the serial I/O buffer in
bytes. Default 256 bytes.
If CONFIG_USBDEV_TRACE is enabled (or CONFIG_DEBUG_FEATURES and CONFIG_DEBUG_USB), then
the add-on code will also manage the USB trace output. The amount of trace output
can be controlled using:
CONFIG_SYSTEM_COMPOSITE_TRACEINIT
Show initialization events
CONFIG_SYSTEM_COMPOSITE_TRACECLASS
Show class driver events
CONFIG_SYSTEM_COMPOSITE_TRACETRANSFERS
Show data transfer events
CONFIG_SYSTEM_COMPOSITE_TRACECONTROLLER
Show controller events
CONFIG_SYSTEM_COMPOSITE_TRACEINTERRUPTS
Show interrupt-related events.
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