19.4.2 USB Bus Analyzer
There are still some conditions that the DEBUG()
and ASSERT()
macros are
not sufficient for a developer to find the problem. One way to gain more debug
information is to use a USB bus analyzer. Because a bus analyzer is inserted
between the host and the device, the bus analyzer can monitor all the traffic
on a single USB cable. Having access to the USB bus traffic information can
make it easier to root cause some difficult bugs-for example, when a host
controller loses packets on some occasions. Also, for the state machine chaos
problem that was introduced in Section 19.3.4, a bus analyzer can display the
packet sequences and the unfinished state machine. This can help quickly solve
that type of problem.