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Using Debug Traces
13-1-3 DEBUG FORMAT
The debug task handler follows a simple format when outputting debug events. The format
is as follows:
USB <timestamp> <endpoint address> <interface number> <error/info message>
In the event that timestamp, endpoint address, interface number or error messages are not
provided, they are left void in the output. An example output is shown in Listing 13-2. This
example corresponds to traces placed in the USB device core and device driver functions.
13
This trace shows the enumeration process where bus events are received and related
endpoints are opened in the device driver. Next, a setup event is sent to the core task
followed by receiving the first Get Device Descriptor standard request.
USB
0
Bus Reset
USB
USB
USB
USB
USB
USB
USB
USB
USB
USB
USB
USB
USB
USB
USB
USB
USB
USB
USB
USB
USB
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
80
0
80
0
80
0
0
0
0
80
80
80
0
0
Drv EP DMA Open
Drv EP DMA Open
Bus Suspend
Bus Reset
Drv EP DMA Close
Drv EP DMA Close
Drv EP DMA Open
Drv EP DMA Open
Drv ISR Rx (Fast)
Setup pkt
Drv ISR Rx Cmpl (Fast)
Drv ISR Rx (Fast)
Get descriptor(Device)
Drv EP FIFO Tx Len: 18
Drv EP FIFO Tx Start Len: 18
Drv ISR Rx (Fast)
Drv ISR Tx Cmpl (Fast)
Drv ISR Rx Cmpl (Fast)
Drv ISR Rx (Fast)
Drv EP FIFO RxZLP
Drv ISR Rx (Fast)
...
Listing 13-2 Sample Debug Output
233
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