README.md



System / composite USB 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)


This add-on can be built as two NSH built-in commands:


CONFIG_NSH_BUILTIN_APPS – 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.


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.