HP EZ-KIT Bedienungsanleitung PDF herunterladen (Seite 40)

Example 2: Benchmarking the Relative Performance of

Memories

2-4 Getting Started with ADSP-BF548 EZ-KIT Lite

Example 2: Benchmarking the Relative

Performance of Memories

Now that you are familiar with basic VisualDSP++ operations, it is time to

analyze and tweak a program’s performance. Close the Example_1.dpj file

using the File–>Close–>Project menu selection. Open the next project

file (Example_2.dpj) located in the

<install_path>\Blackfin\Examples\ADSP-BF548 EZ-Kit Lite\Getting

Started Examples\Example_1 subdirectory of your VisualDSP++

directory.

This project builds on the program discussed in the previous exercise. The

same sequence of function calls (randomize_arrays(), bubble_sort(),

and quick_sort()) now is enclosed in a loop that repeats the sequence suf-

ficient number of times in order to profile the loop’s execution. In

addition, some code has been added to the program to obtain and print a

rough measure of the loop’s execution time in seconds, along with the

number of clock cycles the loop required.

Looking at the new version of the C source file (Sorts.c) you see there are

some additional #include directives at the top of the file. These are C dec-

larations for using printf(), for starting and reading the processor’s

real-time clock (RTC), and for reading the cycle counter. The RTC is a

straightforward device; the code in functions

start_real_time_clock()

and get_real_time_clock_in_seconds() shows how the clock’s control

registers and value are accessed from a C program by simple pointer

de-referencing.

The control registers of all Blackfin peripherals are mapped into the stan-

dard address space and can be accessed in a similar manner; although, the

set-up and control required for most of the other peripherals is more com-

plicated than that for the RTC. In Chapter 3, “Using ADSP-BF548

EZ-KIT Lite Peripherals” on page 3-1, we will see that VisualDSP++ sup-

plies libraries of service functions and device drivers to simplify and

standardize the use of many processor peripherals (including the RTC)

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