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Adam Taylor’s MicroZed Chronicles Part 87: Getting SDSoC up and running Part 3

by Xilinx Employee ‎06-19-2015 11:02 AM - edited ‎02-08-2017 02:48 PM (13,093 Views)

 

By Adam Taylor

 

 

So far in our journey with the Xilinx SDSoC development environment, we have created our first application, run it successfully on the ZedBoard, and obtained performance data for the multiply-and-add function when we run both the reference code and the code to be moved into the hardware within the PS side of the device.

 

Having established that both functions take a similar amount of time to execute, we are going to now move the multiply-and-add function into the PL (programmable logic) side of the Zynq SoC. It’s amazing how simple this is to achieve.

 

When we look at the file structure within the src directory of the example we will see the following:

 

 

  • Main.cpp – Contains the main function, the golden calculation, time stamping and calls to the mult and add functions which are used in the hardware side of the device.
  • Mmult.cpp – Contains the multiplication function to be off loaded into the hardware
  • Madd.cpp – Contains the addition function to be off loaded into the hardware.

 

The next step is to offload just one of these functions to the PL side of the Zynq SoC. We achieve this by one of two methods:

  1. Within the project explorer, we can expand the file to see the functions within that file, select the function of interest, right-click the function, and select Toggle HW/SW [H].

 

 Image1.jpg

 

 

  1. We can open the file and under the outline tab on the right that shows the functions, we can again perform the same option:

 

Image2.jpg

 

 

 

Toggling the mmult() function to be accelerated within the hardware results in an [H] (for “hardware”) being added to the back of the function as shown below:

 

 

Image3.jpg

 

 

 

You will also see the function you have selected under the SDSoC Hardware Functions at the top, beneath your project within the project explorer tab:

 

 

Image4.jpg

 

 

 

Once we’ve done this, SDSoC linker will call automatically Vivado HLS and Vivado to implement the functions within the PL side of the SoC the next time we build the project. It will also create the relevant drivers within the software to support this move into hardware. (We will look more at these in the next blog).

 

In reality the offloading of the function to the PL side of the device becomes seamless, except that you get a significant performance increase.

 

When I moved the mmult() function into the hardware after compilation and generated the SD Card image, the speed increase was significant:

 

 

 

Image5.jpg

 

 

The execution time is only 52444 / 183289 = 0.28 or 28% of the time taken for execution last week when this all ran in software (183289 was the execution time last week).

 

Compared to the performance of the same function executed within the Zynq SoC’s PS (processor system), we have achieved this significant—better than 3x—performance in execution time by a simple mouse click.

Of course in more complex designs, there will be several functions we wish to accelerate. That is where the real power of SDSoC comes into its own and we will be looking at these situations.

In the next blog, we will look more closely at how SDSoC can offload and accelerate functions within the Zynq PL. This is just the start of the journey.

 

 

 

 

MicroZed Chronicles.jpg 

 

 

 

Now, you can have convenient, low-cost Kindle access to the first year of Adam Taylor’s MicroZed Chronicles for a mere $7.50. Click here.

 

 

Please see the previous entries in this MicroZed Chronicles series by Adam Taylor:

 

Adam Taylor’s MicroZed Chronicles Part 86: Getting SDSoC up and running

 

Adam Taylor’s MicroZed Chronicles Part 85: SDSoC—the first instalment

 

Adam Taylor’s MicroZed(ish) Chronicles Part 84: Simple Communication Interfaces Part 4

 

Adam Taylor’s MicroZed(ish) Chronicles Part 83: Simple Communication Interfaces Part 3

 

Adam Taylor’s MicroZed(ish) Chronicles Part 82: Simple Communication Interfaces Part 2

 

Adam Taylor’s MicroZed(ish) Chronicles Part 81: Simple Communication Interfaces

 

Adam Taylor’s MicroZed Chronicles Part 80: LWIP Stack Configuration

 

Adam Taylor’s MicroZed Chronicles Chronicles Part 79: Zynq SoC Ethernet Part III

 

Adam Taylor’s MicroZed Chronicles Chronicles Part 78: Zynq SoC Ethernet Part II

 

Adam Taylor’s MicroZed Chronicles Microzed Chronicles Part 77 – Introducing the Zynq SoC’s Ethernet

 

Adam Taylor’s MicroZed Chronicles Part 76: Constraints for Relatively Placed Macros

 

Adam Taylor’s MicroZed Chronicles, Part 75: Placement Constraints – Pblocks

 

Adam Taylor’s MicroZed Chronicles, Part 73: Physical Constraints

 

Adam Taylor’s MicroZed Chronicles, Part 73: Working with other Zynq-Based Boards

 

Adam Taylor’s MicroZed Chronicles, Part 72: Multi-cycle Constraints

 

Adam Taylor’s MicroZed Chronicles, Part 70: Constraints—Clock Relationships and Avoiding Metastability

 

Adam Taylor’s MicroZed Chronicles, Part 70: Constraints—Introduction to timing and defining a clock

 

Adam Taylor’s MicroZed Chronicles Part 69: Zynq SoC Constraints Overview

 

Adam Taylor’s MicroZed Chronicles Part 68: AXI DMA Part 3, the Software

 

Adam Taylor’s MicroZed Chronicles Part 67: AXI DMA II

 

Adam Taylor’s MicroZed Chronicles Part 66: AXI DMA

 

Adam Taylor’s MicroZed Chronicles Part 65: Profiling Zynq Applications II

 

Adam Taylor’s MicroZed Chronicles Part 64: Profiling Zynq Applications

 

Adam Taylor’s MicroZed Chronicles Part 63: Debugging Zynq Applications

 

Adam Taylor’s MicroZed Chronicles Part 62: Answers to a question on the Zynq XADC

 

Adam Taylor’s MicroZed Chronicles Part 61: PicoBlaze Part Six

 

Adam Taylor’s MicroZed Chronicles Part 60: The Zynq and the PicoBlaze Part 5—controlling a CCD

 

Adam Taylor’s MicroZed Chronicles Part 59: The Zynq and the PicoBlaze Part 4

 

Adam Taylor’s MicroZed Chronicles Part 58: The Zynq and the PicoBlaze Part 3

 

Adam Taylor’s MicroZed Chronicles Part 57: The Zynq and the PicoBlaze Part Two

 

Adam Taylor’s MicroZed Chronicles Part 56: The Zynq and the PicoBlaze

 

Adam Taylor’s MicroZed Chronicles Part 55: Linux on the Zynq SoC

 

Adam Taylor’s MicroZed Chronicles Part 54: Peta Linux SDK for the Zynq SoC

 

Adam Taylor’s MicroZed Chronicles Part 53: Linux and SMP

 

Adam Taylor’s MicroZed Chronicles Part 52: One year and 151,000 views later. Big, Big Bonus PDF!

 

Adam Taylor’s MicroZed Chronicles Part 51: Interrupts and AMP

 

Adam Taylor’s MicroZed Chronicles Part 50: AMP and the Zynq SoC’s OCM (On-Chip Memory)

 

Adam Taylor’s MicroZed Chronicles Part 49: Using the Zynq SoC’s On-Chip Memory for AMP Communications

 

Adam Taylor’s MicroZed Chronicles Part 48: Bare-Metal AMP (Asymmetric Multiprocessing)

 

Adam Taylor’s MicroZed Chronicles Part 47: AMP—Asymmetric Multiprocessing on the Zynq SoC

 

Adam Taylor’s MicroZed Chronicles Part 46: Using both of the Zynq SoC’s ARM Cortex-A9 Cores

 

Adam Taylor’s MicroZed Chronicles Part 44: MicroZed Operating Systems—FreeRTOS

 

Adam Taylor’s MicroZed Chronicles Part 43: XADC Alarms and Interrupts 

 

Adam Taylor’s MicroZed Chronicles MicroZed Part 42: MicroZed Operating Systems Part 4

 

Adam Taylor’s MicroZed Chronicles MicroZed Part 41: MicroZed Operating Systems Part 3

 

Adam Taylor’s MicroZed Chronicles MicroZed Part 40: MicroZed Operating Systems Part Two

 

Adam Taylor’s MicroZed Chronicles MicroZed Part 39: MicroZed Operating Systems Part One

 

Adam Taylor’s MicroZed Chronicles MicroZed Part 38 – Answering a question on Interrupts

 

Adam Taylor’s MicroZed Chronicles Part 37: Driving Adafruit RGB NeoPixel LED arrays with MicroZed Part 8

 

Adam Taylor’s MicroZed Chronicles Part 36: Driving Adafruit RGB NeoPixel LED arrays with MicroZed Part 7

 

Adam Taylor’s MicroZed Chronicles Part 35: Driving Adafruit RGB NeoPixel LED arrays with MicroZed Part 6

 

Adam Taylor’s MicroZed Chronicles Part 34: Driving Adafruit RGB NeoPixel LED arrays with MicroZed Part 5

 

Adam Taylor’s MicroZed Chronicles Part 33: Driving Adafruit RGB NeoPixel LED arrays with the Zynq SoC

 

Adam Taylor’s MicroZed Chronicles Part 32: Driving Adafruit RGB NeoPixel LED arrays

 

Adam Taylor’s MicroZed Chronicles Part 31: Systems of Modules, Driving RGB NeoPixel LED arrays

 

 Adam Taylor’s MicroZed Chronicles Part 30: The MicroZed I/O Carrier Card

 

Zynq DMA Part Two – Adam Taylor’s MicroZed Chronicles Part 29

 

The Zynq PS/PL, Part Eight: Zynq DMA – Adam Taylor’s MicroZed Chronicles Part 28  

 

The Zynq PS/PL, Part Seven: Adam Taylor’s MicroZed Chronicles Part 27

 

The Zynq PS/PL, Part Six: Adam Taylor’s MicroZed Chronicles Part 26

 

The Zynq PS/PL, Part Five: Adam Taylor’s MicroZed Chronicles Part 25

 

The Zynq PS/PL, Part Four: Adam Taylor’s MicroZed Chronicles Part 24

 

The Zynq PS/PL, Part Three: Adam Taylor’s MicroZed Chronicles Part 23

 

The Zynq PS/PL, Part Two: Adam Taylor’s MicroZed Chronicles Part 22

 

The Zynq PS/PL, Part One: Adam Taylor’s MicroZed Chronicles Part 21

 

Introduction to the Zynq Triple Timer Counter Part Four: Adam Taylor’s MicroZed Chronicles Part 20

 

Introduction to the Zynq Triple Timer Counter Part Three: Adam Taylor’s MicroZed Chronicles Part 19

 

Introduction to the Zynq Triple Timer Counter Part Two: Adam Taylor’s MicroZed Chronicles Part 18

 

Introduction to the Zynq Triple Timer Counter Part One: Adam Taylor’s MicroZed Chronicles Part 17

 

The Zynq SoC’s Private Watchdog: Adam Taylor’s MicroZed Chronicles Part 16

 

Implementing the Zynq SoC’s Private Timer: Adam Taylor’s MicroZed Chronicles Part 15

 

MicroZed Timers, Clocks and Watchdogs: Adam Taylor’s MicroZed Chronicles Part 14

 

More About MicroZed Interrupts: Adam Taylor’s MicroZed Chronicles Part 13

 

MicroZed Interrupts: Adam Taylor’s MicroZed Chronicles Part 12

 

Using the MicroZed Button for Input: Adam Taylor’s MicroZed Chronicles Part 11

 

Driving the Zynq SoC's GPIO: Adam Taylor’s MicroZed Chronicles Part 10

 

Meet the Zynq MIO: Adam Taylor’s MicroZed Chronicles Part 9

 

MicroZed XADC Software: Adam Taylor’s MicroZed Chronicles Part 8

 

Getting the XADC Running on the MicroZed: Adam Taylor’s MicroZed Chronicles Part 7

 

A Boot Loader for MicroZed. Adam Taylor’s MicroZed Chronicles, Part 6 

 

Figuring out the MicroZed Boot Loader – Adam Taylor’s MicroZed Chronicles, Part 5

 

Running your programs on the MicroZed – Adam Taylor’s MicroZed Chronicles, Part 4

 

Zynq and MicroZed say “Hello World”-- Adam Taylor’s MicroZed Chronicles, Part 3

 

Adam Taylor’s MicroZed Chronicles: Setting the SW Scene

 

Bringing up the Avnet MicroZed with Vivado

 

 

 

 

 

Comments
by Adventurer
on ‎02-08-2017 09:31 AM

There is an error in the explanation of what each *.cpp does. The actual names of the files are not written.

by Observer taylo_ap
on ‎02-09-2017 02:11 PM

Cerilet

 

Thanks for pointing this out it has been corrected now 

 

Adam 

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About the Author
  • Be sure to join the Xilinx LinkedIn group to get an update for every new Xcell Daily post! ******************** Steve Leibson is the Director of Strategic Marketing and Business Planning at Xilinx. He started as a system design engineer at HP in the early days of desktop computing, then switched to EDA at Cadnetix, and subsequently became a technical editor for EDN Magazine. He's served as Editor in Chief of EDN Magazine, Embedded Developers Journal, and Microprocessor Report. He has extensive experience in computing, microprocessors, microcontrollers, embedded systems design, design IP, EDA, and programmable logic.