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

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Tuesday, June 12, 2007
FPGA design from scratch. Part 32
Writing the "Hello World" program

It is time to write our first application c-program. The purpose of the program is to display "Hello World" on the LCD display. Let's get started. We will use the
Software Development Kit (SDK) from Xilinx to help us accomplish the task. We start SDK from within Xilinx Platform Studio (XPS) using the menu command Software->Launch Platform Studio SDK.

To find out more about how to use SDK we select the Help menu.

When we click the Getting Started book the SDK design checklist is displayed in our web browser.

We are going to use available software drivers in our program. Let's find out how do that by studying the SDK design checklist.

SDK platform settings

Select Xilinx Tools->Software Platform Settings to look at the available software drivers and the current version used.

C program build

Select the menu Project->Properties to display the program build settings.

C header files

We find all header files in the directory .../SDK_projects/microblaze_0_sw_platform/microblaze_0/include.

The file xparameters.h holds information about the LCD_16x2 module. We will include this file in our c-program.

/* Definitions for peripheral LCD_16X2 */
#define XPAR_LCD_16X2_BASEADDR 0x41F0C000
#define XPAR_LCD_16X2_DEVICE_ID 3
#define XPAR_LCD_16X2_IS_DUAL 0

The GPIO API definitions

The header file xgpio.h contains the software
API definition of the Xilinx General Purpose I/O (XGpio) device driver component. This file will also be included in our c-program.

C program examples

We are not going to re-invent the wheel. Let's look for some good examples to copy. In the directory .../edk91i/sw/XilinxProcessorIPLib/drivers/gpio_v2_01_a there are a few good ones.

More program examples

Looking in the directories of the reference system CD the following example files were found (xrom_lcd.c and xrom_lcd.h).

Let's use the functions declared in xrom_lcd.h.

Main program

/*                                                                       */
/*                  I N C L U D E  &   D E F I N E                       */
/*                                                                       */

  #include "xparameters.h"

  #include "xgpio.h"
  #include "xutil.h"
  #include "stdio.h"
  #include "xrom_lcd.h"

  // The following constant maps to the name of the hardware instances that
  // were created in the EDK XPS system.

  // The following constant is used to determine which channel of the GPIO is
  // used for the LCD if there are 2 channels supported.

  #define LCD_CHANNEL 1
  #define LED_CHANNEL 1

  // The following are declared globally so they are zeroed and so they are
  // easily accessible from a debugger

  XGpio GpioLCD;     /* The Instance of the LCD GPIO Driver */
  XGpio GpioLED4;    /* The Instance of the LED4 GPIO Driver */
  XGpio GpioLEDPOS;  /* The Instance of the LED Pos GPIO Driver */
/*                                                                       */
/*                        M A I N   P R O G R A M                        */
/*                                                                       */

int main(void) {

    XStatus Status;
    // Initialize the GPIO component
    Status = XGpio_Initialize(&GpioLCD, GPIO_LCD_DEVICE_ID);
    if (Status != XST_SUCCESS) return XST_FAILURE;

    // Set the direction for all bits to be outputs
    XGpio_SetDataDirection(&GpioLCD, LCD_CHANNEL, 0x0000);

    // Initialize the LCD

    // Send single characters to the LCD
    print("Send Hello World to the LCD ");
XromLCDPrintChar(" ");
    print("Hello World is displayed on the LCD display ");           

    return XST_SUCCESS;

Device configuration in SDK

After we built our SDK project, we can download an Executable Linked Format (ELF) file for running or debugging on the target processor. To configure our hardware:
  1. Specify the ELF file to be marked for block RAM (BRAM) initialization by selecting Device Configuration > Program Hardware Settings
  2. Select the initialization file (Bootloop, XMDStub, or ELF file) and click Save.

To download the program bit file (download_sdk.bit) use the command: Device Configuration->Program Hardware.

Top   Next  Previous

Posted at 10:36 by

Ranga Prasad
October 13, 2008   11:21 AM PDT
Dear Svenand,
Thanks alot for superb and useful tutorial. I have a question. I have a Spartan 3 board with Xc3s2000 FPGA from AVNET. It has DMC20215 LCD. But I dont have any software driver file for LCD from AVNET like your Xrom_lcd.c. SHould I be provided with it or Do I need to write my own software driver which is little difficult? Please suggest me.

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