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Chapter 13
13-2 HANDLING DEBUG EVENTS
13-2-1 DEBUG EVENT POOL
A pool is used to keep track of debugging events. This pool is made up of debug event
structures where the size of the pool is specified by USBD_CFG_DBG_TRACE_NBR_EVENTS in
the application configuration. Within the core, each time a new debug standard request is
received, the message’s details will be set into a debug event structure and queued into the
pool. Once the debug event is properly queued, a ready signal is invoked to notify the
13
debug task handler that an event is ready to be processed.
13-2-2 DEBUG TASK
An OS-dependent task is used to process debug events. The debug task handler simply
pends until an event ready signal is received and obtains a pointer to the first debug event
structure from the pool. The details of the debug event structure is then formatted and
outputted via the application trace function. At the end of the output, the debug event
structure is then subsequently freed and the debug task will pend and process the next
debug event structure ready. Refer to section 4-2-3 “Processing Debug Events” on page 63
for details on processing debug events.
13-2-3 DEBUG MACROS
Within the core, several macros are created to set debug messages. These macros are
defined in usbd_core.h and make use of the core functions USBD_Dbg() and
USBD_DbgArg() that will set up a debug event structure and put the event into the debug
event pool. These macros are defined in Listing 13-3.
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