Data flows into and out of an AI Engine
kernel through access windows, or a stream interface. During debug you might want to
see the value of these data access windows as data is passing through the kernels.
In the case of data windows, the Vitis IDE debug
environment provides methods to view and access the data as described in Viewing Data from Buffer Port Interfaces. In the case of stream interface connections, it is
recommended to add printf() statements to your code
to let you examine the data passing through the kernel.
printf() statements to the code suppresses compiler
optimizations, and results in a larger kernel executable program that might not fit
into the available memory of the AI Engine processor.When adding the printf() statement in your
kernel code you must select Enable Profile in
the launch configuration for Debug as shown in the following figure. You can also
select the cores for which profiling should be enabled. By default, all cores are
selected.
When adding the printf() statement in your
kernel code you must also add the --profile option
in the Run Configurations
or Debug Configurations
dialog box in the Vitis IDE. Add --profile to the Arguments tab of the Debug Configuration, along with
whatever other options are already specified, as shown in the following figure.
Adding the printf() statements to your source
code, results in the output of streaming data as it is processed by the kernel. The
following figure shows an example of such output in the console window. This
provides visibility to capture and debug the dataflow through streaming
interfaces.
