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< title > NuttX USB Trace Capability< / title >
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< h1 > < big > < font color = "#3c34ec" > < i > NuttX USB Device Trace< / i > < / font > < / big > < / h1 >
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< p > Last Updated: March 20, 2011< / p >
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< p > < b > USB Device Tracing Controls< / b > .
The NuttX USB device subsystem supports a fairly sophisticated tracing facility.
The basic trace cabability is controlled by these NuttX configuration settings:
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< ul >
< li > < code > CONFIG_USBDEV_TRACE< / code > : Enables USB tracing< / li >
< li > < code > CONFIG_USBDEV_TRACE_NRECORDS< / code > : Number of trace entries to remember< / li >
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< p > < b > Trace IDs< / b > .
The trace facility works like this:
When enabled, USB events that occur in either the USB device driver or in the USB class driver are logged.
These events are described in < code > include/nuttx/usb/usbdev_trace.h< / code > .
The logged events are identified by a set of event IDs:
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< td > < code > TRACE_INIT_ID< / code > < / td >
< td > Initialization events< / td >
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< td > < code > TRACE_EP_ID< / code > < / td >
< td > Endpoint API calls< / td >
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< td > < code > TRACE_DEV_ID< / code > < / td >
< td > USB device API calls< / td >
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< td > < code > TRACE_CLASS_ID< / code > < / td >
< td > USB class driver API calls< / td >
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< td > < code > TRACE_CLASSAPI_ID< / code > < / td >
< td > Other class driver system API calls< / td >
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< td > < code > TRACE_CLASSSTATE_ID< / code > < / td >
< td > Track class driver state changes< / td >
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< td > < code > TRACE_INTENTRY_ID< / code > < / td >
< td > Interrupt handler entry< / td >
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< td > < code > TRACE_INTDECODE_ID< / code > < / td >
< td > Decoded interrupt event< / td >
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< td > < code > TRACE_INTEXIT_ID< / code > < / td >
< td > Interrupt handler exit< / td >
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< td > < code > TRACE_OUTREQQUEUED_ID< / code > < / td >
< td > Request queued for OUT endpoint< / td >
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< td > < code > TRACE_INREQQUEUED_ID< / code > < / td >
< td > Request queued for IN endpoint< / td >
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< td > < code > TRACE_READ_ID< / code > < / td >
< td > Read (OUT) action< / td >
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< td > < code > TRACE_WRITE_ID< / code > < / td >
< td > Write (IN) action< / td >
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< td > < code > TRACE_COMPLETE_ID< / code > < / td >
< td > Request completed< / td >
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< td > < code > TRACE_DEVERROR_ID< / code > < / td >
< td > USB controller driver error event< / td >
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< td > < code > TRACE_CLSERROR_ID< / code > < / td >
< td > USB class driver error event< / td >
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< p > < b > Logged Events< / b > .
Each logged event is 32-bits in size and includes
< / p >
< ol >
< li > 8-bits of the trace ID (values associated with the above)< / li >
< li > 8-bits of additional trace ID data, and< / li >
< li > 16-bits of additonal data.< / li >
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< p > < b > 8-bit Trace Data< / b >
The 8-bit trace data depends on the specific event ID. As examples,
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For the USB serial and mass storage class, the 8-bit event data is provided in < code > include/nuttx/usb/usbdev_trace.h< / code > .
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For the USB device driver, that 8-bit event data is provided within the USB device driver itself.
So, for example, the 8-bit event data for the LPC1768 USB device driver is found in < code > arch/arm/src/lpc17xx/lpc17_usbdev.c< / code > .
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< p > < b > 16-bit Trace Data< / b > .
The 16-bit trace data provided additional context data relevant to the specific logged event.
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< p > < b > Trace Control Interfaces< / b > .
Logging of each of these kinds events can be enabled or disabled using the interfaces described in < code > include/nuttx/usb/usbdev_trace.h< / code > .
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< p > < b > Enabling USB Device Tracing< / b > .
USB device tracing will be configured if < code > CONFIG_USBDEV< / code > and either of the following are set in the NuttX configuration file:
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< li > < code > CONFIG_USBDEV_TRACE< / code > , or< / li >
< li > < code > CONFIG_DEBUG and CONFIG_DEBUG_USB< / code > < / li >
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< p > < b > Log Data Sink< / b > .
The logged data itself may go to either (1) an internal circular buffer, or (2) may be provided on the console.
If < code > CONFIG_USBDEV_TRACE< / code > is defined, then the trace data will go to the circular buffer.
The size of the circular buffer is determined by < code > CONFIG_USBDEV_TRACE_NRECORDS< / code > .
Otherwise, the trace data goes to console.
< p >
< p > < b > Example< / b > .
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Here is an example of USB trace output using < code > apps/examples/usbserial< / code > for an LPC1768 platform with the following NuttX configuration settings:
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< li > < code > CONFIG_DEBUG< / code > , < code > CONFIG_DEBUG_VERBOSE< / code > , < code > CONFIG_USB< / code >
< li > < code > CONFIG_EXAMPLES_USBSERIAL_TRACEINIT< / code > , < code > CONFIG_EXAMPLES_USBSERIAL_TRACECLASS< / code > ,
< code > CONFIG_EXAMPLES_USBSERIAL_TRACETRANSFERS< / code > , < code > CONFIG_EXAMPLES_USBSERIAL_TRACECONTROLLER< / code > ,
< code > CONFIG_EXAMPLES_USBSERIAL_TRACEINTERRUPTS< / code >
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< p > Console Output:< / p >
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< td align = "left" > < code > ABDE< / code > < / td >
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< td align = "center" > < / td >
< td align = "left" > < code > user_start: Registering USB serial driver< / code > < / td >
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< td align = "center" > < / td >
< td align = "left" > < code > uart_register: Registering /dev/ttyUSB0< / code > < / td >
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< td align = "center" > < / td >
< td align = "left" > < code > user_start: Successfully registered the serial driver< / code > < / td >
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< td align = "center" > 1< / td >
< td align = "left" > < code > Class API call 1: 0000< / code > < / td >
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< td align = "center" > 2< / td >
< td align = "left" > < code > Class error: 19:0000< / code > < / td >
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< td align = "center" > < / td >
< td align = "left" > < code > user_start: ERROR: Failed to open /dev/ttyUSB0 for reading: 107< / code > < / td >
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< td align = "center" > < / td >
< td align = "left" > < code > user_start: Not connected. Wait and try again.< / code > < / td >
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< td align = "center" > 3< / td >
< td align = "left" > < code > Interrupt 1 entry: 0039< / code > < / td >
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< td align = "center" > 4< / td >
< td align = "left" > < code > Interrupt decode 7: 0019< / code > < / td >
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< td align = "center" > 5< / td >
< td align = "left" > < code > Interrupt decode 32: 0019< / code > < / td >
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< td align = "center" > 6< / td >
< td align = "left" > < code > Interrupt decode 6: 0019< / code > < / td >
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< td align = "center" > 7< / td >
< td align = "left" > < code > Class disconnect(): 0000< / code > < / td >
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< td align = "center" > 8< / td >
< td align = "left" > < code > Device pullup(): 0001< / code > < / td >
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< td align = "center" > 9< / td >
< td align = "left" > < code > Interrupt 1 exit: 0000< / code > < / td >
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< p >
The numbered items are USB USB trace output.
You can look in the file < code > drivers/usbdev/usbdev_trprintf.c< / code > to see examctly how each output line is formatted.
Here is how each line should be interpreted:
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< td align = "left" > USB EVENT ID< / td >
< td align = "right" > 8-bit< br > EVENT< br > DATA< / td >
< td align = "left" > MEANING< / td >
< td align = "left" > 16-bit< br > EVENT< br > DATA< / td >
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< td align = "center" > 1< / td >
< td align = "left" > < code > TRACE_CLASSAPI_ID< / code > < sup > 1< / sup > < / td >
< td align = "right" > 1< / td >
< td align = "left" > < code > USBSER_TRACECLASSAPI_SETUP< / code > < sup > 1< / sup > < / td >
< td align = "left" > 0000< / td >
< / tr >
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< td align = "center" > 2< / td >
< td align = "left" > < code > TRACE_CLSERROR_ID< / code > < sup > 1< / sup > < / td >
< td align = "right" > 19< / td >
< td align = "left" > < code > USBSER_TRACEERR_SETUPNOTCONNECTED< / code > < sup > 1< / sup > < / td >
< td align = "left" > 0000< / td >
< / tr >
< tr >
< td align = "center" > 3< / td >
< td align = "left" > < code > TRACE_INTENTRY_ID< / code > < sup > 1< / sup > < / td >
< td align = "right" > 1< / td >
< td align = "left" > < code > LPC17_TRACEINTID_USB< / code > < sup > 2< / sup > < / td >
< td align = "left" > 0039< / td >
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< td align = "center" > 4< / td >
< td align = "left" > < code > TRACE_INTDECODE_ID< / code > < sup > 2< / sup > < / td >
< td align = "right" > 7< / td >
< td align = "left" > < code > LPC17_TRACEINTID_DEVSTAT< / code > < sup > 2< / sup > < / td >
< td align = "left" > 0019< / td >
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< td align = "center" > 5< / td >
< td align = "left" > < code > TRACE_INTDECODE_ID< / code > < sup > 2< / sup > < / td >
< td align = "right" > 32< / td >
< td align = "left" > < code > LPC17_TRACEINTID_SUSPENDCHG< / code > < sup > 2< / sup > < / td >
< td align = "left" > 0019< / td >
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< td align = "center" > 6< / td >
< td align = "left" > < code > TRACE_INTDECODE_ID< / code > < sup > 2< / sup > < / td >
< td align = "right" > 6< / td >
< td align = "left" > < code > LPC17_TRACEINTID_DEVRESET< / code > < sup > 2< / sup > < / td >
< td align = "left" > 0019< / td >
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< td align = "center" > 7< / td >
< td align = "left" > < code > TRACE_CLASS_ID< / code > < sup > 1< / sup > < / td >
< td align = "right" > 3< / td >
< td align = "left" > < code > (See TRACE_CLASSDISCONNECT< / code > < sup > 1< / sup > )< / td >
< td align = "left" > 0000< / td >
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< td align = "center" > 8< / td >
< td align = "left" > < code > TRACE_DEV_ID< / code > < sup > 1< / sup > < / td >
< td align = "right" > 6< / td >
< td align = "left" > < code > (See TRACE_DEVPULLUP< / code > < sup > 1< / sup > )< / td >
< td align = "left" > 0001< / td >
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< td align = "center" > 9< / td >
< td align = "left" > < code > TRACE_INTEXIT_ID< / code > < sup > 1< / sup > < / td >
< td align = "right" > 1< / td >
< td align = "left" > < code > LPC17_TRACEINTID_USB< / code > < sup > 2< / sup > < / td >
< td align = "left" > 0000< / td >
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< p > < small > < b > NOTES< / b > :< br >
< sup > 1< / sup > See < code > include/nuttx/usb/usbdev_trace.h< / code > < br >
< sup > 2< / sup > < code > See arch/arm/src/lpc17xx/lpc17_usbdev.c< / code >
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In the above example you can see that:
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< li > < b > 1< / b > .
The serial class USB setup method was called for the USB serial class.
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This is the corresponds to the following logic in < code > drivers/usbdev/pl2303.c< / code > :
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< ul > < pre >
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static int pl2303_setup(FAR struct uart_dev_s *dev)
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{
...
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usbtrace(PL2303_CLASSAPI_SETUP, 0);
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...
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< li > < b > 2< / b > .
An error occurred while processing the setup command because no configuration has yet been selected by the host.
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This corresponds to the following logic in < code > drivers/usbdev/pl2303.c< / code > :
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< ul > < pre >
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static int pl2303_setup(FAR struct uart_dev_s *dev)
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{
...
/* Check if we have been configured */
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if (priv->config == PL2303_CONFIGIDNONE)
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{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_SETUPNOTCONNECTED), 0);
return -ENOTCONN;
}
...
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< li > < b > 3-6< / b > .
Here is a USB interrupt that suspends and resets the device.
< / li >
< li > < b > 7-8< / b > .
During the interrupt processing the serial class is disconnected
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< li > < b > 9< / b > .
And the interrupt returns
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