system/cdcacm
^^^^^^^^^^^^^^^
This very simple add-on allows the USB CDC/ACM serial device can be dynamically
connected and disconnected from a host. This add-on can only be used as
an NSH built-in command. If built-in, then two new NSH commands will be
supported:
1. sercon - Connect the CDC/ACM serial device
2. serdis - Disconnect the CDC/ACM serial device
Configuration prerequisites (not complete):
CONFIG_USBDEV=y : USB device support must be enabled
CONFIG_CDCACM=y : The CDC/ACM driver must be built
Configuration options specific to this add-on:
CONFIG_SYSTEM_CDCACM_DEVMINOR : The minor number of the CDC/ACM device.
: i.e., the 'x' in /dev/ttyACMx
If CONFIG_USBDEV_TRACE is enabled (or CONFIG_DEBUG_FEATURES and CONFIG_DEBUG_USB, or
CONFIG_USBDEV_TRACE), then the add-on code will also initialize the USB trace
output. The amount of trace output can be controlled using:
CONFIG_SYSTEM_CDCACM_TRACEINIT
Show initialization events
CONFIG_SYSTEM_CDCACM_TRACECLASS
Show class driver events
CONFIG_SYSTEM_CDCACM_TRACETRANSFERS
Show data transfer events
CONFIG_SYSTEM_CDCACM_TRACECONTROLLER
Show controller events
CONFIG_SYSTEM_CDCACM_TRACEINTERRUPTS
Show interrupt-related events.
Note: This add-on is only enables or disable USB CDC/ACM via the NSH
'sercon' and 'serdis' command. It will enable and disable tracing per
the settings before enabling and after disabling the CDC/ACM device. It
will not, however, monitor buffered trace data in the interim. If
CONFIG_USBDEV_TRACE is defined (and the debug options are not), other
application logic will need to monitor the buffered trace data.
