New Horizons

Welcome to my blog

My name is Sven Andersson and I
work as a consultant in embedded
system design, implemented in ASIC
and FPGA.
In my spare time I write this blog
and I hope it will inspire others to
learn more about this fantastic field.
I live in Stockholm Sweden and have
my own company


You are welcome to contact me
and ask questions or make comments
about my blog.


New Horizons
What's new
Starting a blog
Writing a blog
Using an RSS reader

Zynq Design From Scratch
Started February 2014
1 Introduction
Changes and updates
2 Zynq-7000 All Programmable SoC
3 ZedBoard and other boards
4 Computer platform and VirtualBox
5 Installing Ubuntu
6 Fixing Ubuntu
7 Installing Vivado
8 Starting Vivado
9 Using Vivado
10 Lab 1. Create a Zynq project
11 Lab 1. Build a hardware platform
12 Lab 1. Create a software application
13 Lab 1. Connect to ZedBoard
14 Lab 1. Run a software application
15 Lab 1. Benchmarking ARM Cortex-A9
16 Lab 2. Adding a GPIO peripheral
17 Lab 2. Create a custom HDL module
18 Lab 2. Connect package pins and implement
19 Lab 2. Create a software application and configure the PL
20 Lab 2. Debugging a software application
21 Running Linux from SD card
22 Installing PetaLinux
23 Booting PetaLinux
24 Connect to ZedBoad via ethernet
25 Rebuilding the PetaLinux kernel image
26 Running a DHCP server on the host
27 Running a TFTP server on the host
28 PetaLinux boot via U-boot
29 PetaLinux application development
30 Fixing the host computer
31 Running NFS servers
32 VirtualBox seamless mode
33 Mounting guest file system using sshfs
34 PetaLinux. Setting up a web server
35 PetaLinux. Using cgi scripts
36 PetaLinux. Web enabled application
37 Convert from VirtualBox to VMware
38 Running Linaro Ubuntu on ZedBoard
39 Running Android on ZedBoard
40 Lab2. Booting from SD card and SPI flash
41 Lab2. PetaLinux board bringup
42 Lab2. Writing userspace IO device driver
43 Lab2. Hardware debugging
44 MicroZed quick start
45 Installing Vivado 2014.1
46 Lab3. Adding push buttons to our Zynq system
47 Lab3. Adding an interrupt service routine
48 Installing Ubuntu 14.04
49 Installing Vivado and Petalinux 2014.2
50 Using Vivado 2014.2
51 Upgrading to Ubuntu 14.04
52 Using Petalinux 2014.2
53 Booting from SD card and SPI flash
54 Booting Petalinux 2014.2 from SD card
55 Booting Petalinux 2014.2 from SPI flash
56 Installing Vivado 2014.3

Chipotle Verification System

EE Times Retrospective Series
It all started more than 40 years ago
My first job as an electrical engineer
The Memory (R)evolution
The Microprocessor (R)evolution

Four soft-core processors
Started January 2012
Table of contents
OpenRISC 1200
Nios II

Using the Spartan-6 LX9 MicroBoard
Started August 2011
Table of contents
Problems, fixes and solutions

FPGA Design From Scratch
Started December 2006
Table of contents
Acronyms and abbreviations

Actel FPGA design
Designing with an Actel FPGA. Part 1
Designing with an Actel FPGA. Part 2
Designing with an Actel FPGA. Part 3
Designing with an Actel FPGA. Part 4
Designing with an Actel FPGA. Part 5

A hardware designer's best friend
Zoo Design Platform

Installing Cobra Command Tool
A processor benchmark

Porting a Unix program to Mac OS X
Fixing a HyperTerminal in Mac OS X
A dream come true

Stockholm by bike

The New York City Marathon

Kittelfjall Lappland

Tour skating in Sweden and around the world
Wild skating
Tour day
Safety equipment
A look at the equipment you need
Skate maintenance
Books, photos, films and videos
Weather forecasts

38000 feet above see level
A trip to Spain
Florida the sunshine state

Photo Albums
Seaside Florida
Ronda Spain
Sevilla Spain
Cordoba Spain
Alhambra Spain
KittelfjÀll Lapland
Landsort Art Walk
Skating on thin ice

100 Power Tips for FPGA Designers

Adventures in ASIC
Computer History Museum
Design & Reuse
d9 Tech Blog
EDA Cafe
EDA DesignLine
Eli's tech Blog
FPGA Arcade
FPGA Central
FPGA developer
FPGA Journal
FPGA World
Lesley Shannon Courses
Mac 2 Ubuntu
Programmable Logic DesignLine
World of ASIC

If you want to be updated on this weblog Enter your email here:

rss feed

Wednesday, September 21, 2011
FPGA design from scratch. Part 68
Writing code for the new peripheral

To test the new peripheral we will create a new software application in Platform Studio SDK and use the GPIO device drivers. We start SDK and select the workspace: /home/svan/projects/LX9_AXI/SDK

SDK will detect that the hardware system has changed and display this window.

Click Yes to update the hardware platform and BSP. SDK will open and display the updated system.xml file.

Create a new application

Go to File->New->Xilinx C project.

Name the project Tutorial_Test and select Empty Application from the project template.

Select Target an Existing Board Support Package then click Finish.

Adding a source file

Select the Tutorial_Test/src directory and go to File->New->Source File. Enter main.c for the file name. Click Finish.

Writing the C code

We add the following code in to main.c:

#include "xparameters.h"
#include "stdio.h"
#include "xbasic_types.h"
#include "xgpio_l.h"

int main(void) {

   u32    DIP_Read;

   print("--Entering main-- ");

   while (1) {



   return 0;


This program will read a 4-bit value from the DIP switches and write this value to the LED register driving the LEDs. DIP_Read is a 32-bit global variable defined in xbasic_types.h. XGpio_ReadReg and XGpio_WriteReg are a low level drivers defined in xgpio_l.h

Save the file. The application will be compiled when saved. The Project menu gives options to change the behavior for building the application.

Generate a linker script
In the SDK Project Explorer View, right-click on the Tutorial_Test project and select Generate Linker Script. This time we are going to put all the code in internal BRAM. The program will be recompiled when the linker script has changed.

Test the generated system with the new application

In SDK, click on the Program FPGA icon.

Click the program button to start the programming.

Run the program
  1. In the SDK Project Explorer View, right-click on the Tutorial_Test project and select Run As -> Run Configuration.
  2. Select Xilinx C/C++ ELF and click the New Launch Configuration icon.
  3. In the SDK Run Configurations window select the STDIO Connection tab
  4. Check the Connect STDIO to Console box
  5. Leave the baud rate at 9600

Click the RUN button to start the program execution. Carefully modify the DIP switches positions to turn the LEDs on and off. Make sure the text "--Entering Mani()---" is displayed on the console.

Top Previous Next

Posted at 14:39 by


Leave a Comment:


Homepage (optional)


Previous Entry Home Next Entry