2016-06-11 22:13:39 +02:00
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system/cdcacm
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^^^^^^^^^^^^^^^
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This very simple add-on allows the USB CDC/ACM serial device can be dynamically
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connected and disconnected from a host. This add-on can only be used as
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an NSH built-in command. If built-in, then two new NSH commands will be
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supported:
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1. sercon - Connect the CDC/ACM serial device
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2. serdis - Disconnect the CDC/ACM serial device
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Configuration prequisites (not complete):
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CONFIG_USBDEV=y : USB device support must be enabled
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CONFIG_CDCACM=y : The CDC/ACM driver must be built
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CONFIG_NSH_BUILTIN_APPS : NSH built-in application support must be enabled
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Configuration options specific to this add-on:
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CONFIG_SYSTEM_CDCACM_DEVMINOR : The minor number of the CDC/ACM device.
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: i.e., the 'x' in /dev/ttyACMx
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If CONFIG_USBDEV_TRACE is enabled (or CONFIG_DEBUG_FEATURES and CONFIG_DEBUG_USB, or
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CONFIG_USBDEV_TRACE), then the add-on code will also initialize the USB trace
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output. The amount of trace output can be controlled using:
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CONFIG_SYSTEM_CDCACM_TRACEINIT
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Show initialization events
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CONFIG_SYSTEM_CDCACM_TRACECLASS
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Show class driver events
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CONFIG_SYSTEM_CDCACM_TRACETRANSFERS
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Show data transfer events
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CONFIG_SYSTEM_CDCACM_TRACECONTROLLER
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Show controller events
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CONFIG_SYSTEM_CDCACM_TRACEINTERRUPTS
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Show interrupt-related events.
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Note: This add-on is only enables or disable USB CDC/ACM via the NSH
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'sercon' and 'serdis' command. It will enable and disable tracing per
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the settings before enabling and after disabling the CDC/ACM device. It
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will not, however, monitor buffered trace data in the interim. If
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CONFIG_USBDEV_TRACE is defined (and the debug options are not), other
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application logic will need to monitor the buffered trace data.
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