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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>
<p>Last Updated: March 20, 2011</p>
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<hr><hr>
<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:
</p>
<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>
</ul>
<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:
</p>
<ul><table>
<tr>
<td><code>TRACE_INIT_ID</code></td>
<td>Initialization events</td>
</tr>
<tr>
<td><code>TRACE_EP_ID</code></td>
<td>Endpoint API calls</td>
</tr>
<tr>
<td><code>TRACE_DEV_ID</code></td>
<td>USB device API calls</td>
</tr>
<tr>
<td><code>TRACE_CLASS_ID</code></td>
<td>USB class driver API calls</td>
</tr>
<tr>
<td><code>TRACE_CLASSAPI_ID</code></td>
<td>Other class driver system API calls</td>
</tr>
<tr>
<td><code>TRACE_CLASSSTATE_ID</code></td>
<td>Track class driver state changes</td>
</tr>
<tr>
<td><code>TRACE_INTENTRY_ID</code></td>
<td>Interrupt handler entry</td>
</tr>
<tr>
<td><code>TRACE_INTDECODE_ID</code></td>
<td>Decoded interrupt event</td>
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<tr>
<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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<tr>
<td><code>TRACE_READ_ID</code></td>
<td>Read (OUT) action</td>
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<tr>
<td><code>TRACE_WRITE_ID</code></td>
<td>Write (IN) action</td>
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<tr>
<td><code>TRACE_COMPLETE_ID</code></td>
<td>Request completed</td>
</tr>
<tr>
<td><code>TRACE_DEVERROR_ID</code></td>
<td>USB controller driver error event</td>
</tr>
<tr>
<td><code>TRACE_CLSERROR_ID</code></td>
<td>USB class driver error event</td>
</tr>
</table></ul>
<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>
</ol>
<p><b>8-bit Trace Data</b>
The 8-bit trace data depends on the specific event ID. As examples,
</p>
<ul>
<li>
For the USB serial and mass storage class, the 8-bit event data is provided in <code>include/nuttx/usb/usbdev_trace.h</code>.
</li>
<li>
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>.
</li>
</ul>
<p><b>16-bit Trace Data</b>.
The 16-bit trace data provided additional context data relevant to the specific logged event.
</p>
<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>.
</p>
<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:
</p>
<ul>
<li><code>CONFIG_USBDEV_TRACE</code>, or</li>
<li><code>CONFIG_DEBUG and CONFIG_DEBUG_USB</code></li>
</ul>
<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>.
Here is an example of USB trace output using <code>apps/examples/usbserial</code> for an LPC1768 platform with the following NuttX configuration settings:
</p>
<ul>
<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>
</ul>
<p>Console Output:</p>
<ul><table>
<tr>
<td align="center">&nbsp;</td>
<td align="left"><code>ABDE</code></td>
</tr>
<tr>
<td align="center">&nbsp;</td>
<td align="left"><code>user_start: Registering USB serial driver</code></td>
</tr>
<tr>
<td align="center">&nbsp;</td>
<td align="left"><code>uart_register: Registering /dev/ttyUSB0</code></td>
</tr>
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<td align="center">&nbsp;</td>
<td align="left"><code>user_start: Successfully registered the serial driver</code></td>
</tr>
<tr>
<td align="center">1</td>
<td align="left"><code>Class API call 1: 0000</code></td>
</tr>
<tr>
<td align="center">2</td>
<td align="left"><code>Class error: 19:0000</code></td>
</tr>
<tr>
<td align="center">&nbsp;</td>
<td align="left"><code>user_start: ERROR: Failed to open /dev/ttyUSB0 for reading: 107</code></td>
</tr>
<tr>
<td align="center">&nbsp;</td>
<td align="left"><code>user_start: Not connected. Wait and try again.</code></td>
</tr>
<tr>
<td align="center">3</td>
<td align="left"><code>Interrupt 1 entry: 0039</code></td>
</tr>
<tr>
<td align="center">4</td>
<td align="left"><code>Interrupt decode 7: 0019</code></td>
</tr>
<tr>
<td align="center">5</td>
<td align="left"><code>Interrupt decode 32: 0019</code></td>
</tr>
<tr>
<td align="center">6</td>
<td align="left"><code>Interrupt decode 6: 0019</code></td>
</tr>
<tr>
<td align="center">7</td>
<td align="left"><code>Class disconnect(): 0000</code></td>
</tr>
<tr>
<td align="center">8</td>
<td align="left"><code>Device pullup(): 0001</code></td>
</tr>
<tr>
<td align="center">9</td>
<td align="left"><code>Interrupt 1 exit: 0000</code></td>
</tr>
</table></ul>
<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:
</p>
<ul><table>
<tr>
<th align="center">&nbsp</th>
<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>
</tr>
<tr>
<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>
<tr>
<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>
</tr>
<tr>
<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>
</tr>
<tr>
<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>
</tr>
<tr>
<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>
</tr>
<tr>
<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>
</tr>
<tr>
<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>
</tr>
<tr>
<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>
</tr>
</table>
<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>
</small></p>
</ul>
<p>
In the above example you can see that:
</p>
<ul>
<li><b>1</b>.
The serial class USB setup method was called for the USB serial class.
This is the corresponds to the following logic in <code>drivers/usbdev/usbdev_serial.c</code>:
<ul><pre>
static int usbser_setup(FAR struct uart_dev_s *dev)
{
...
usbtrace(USBSER_CLASSAPI_SETUP, 0);
...
</pre></ul>
</li>
<li><b>2</b>.
An error occurred while processing the setup command because no configuration has yet been selected by the host.
This corresponds to the following logic in <code>drivers/usbdev/usbdev_serial.c</code>:
<ul><pre>
static int usbser_setup(FAR struct uart_dev_s *dev)
{
...
/* Check if we have been configured */
if (priv->config == USBSER_CONFIGIDNONE)
{
usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_SETUPNOTCONNECTED), 0);
return -ENOTCONN;
}
...
</pre></ul>
<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
</li>
<li><b>9</b>.
And the interrupt returns
</li>
</ul>
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