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

Contact

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



Content

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

Zynq Design From Scratch
Started February 2014
Introduction
Changes and updates
Zynq-7000 All Programmable SoC
ZedBoard and other boards
Computer platform and VirtualBox
Installing Ubuntu
Fixing Ubuntu
Installing Vivado
Starting Vivado
Using Vivado
Lab 1. Create a Zynq project
Lab 1. Build a hardware platform
Lab 1. Create a software application
Lab 1. Connect to ZedBoard
Lab 1. Run a software application
Lab 1. Benchmarking ARM Cortex-A9
Lab 2. Adding a GPIO peripheral
Lab 2. Create a custom HDL module
Lab 2. Connect package pins and implement
Lab 2. Create a software application and configure the PL
Lab 2. Debugging a software application
Running Linux from SD card
Installing PetaLinux
Booting PetaLinux
Connect to ZedBoad via ethernet
Rebuilding the PetaLinux kernel image
Running a DHCP server on the host
Running a TFTP server on the host
PetaLinux boot via U-boot
PetaLinux application development
Fixing the host computer
Running NFS servers
VirtualBox seamless mode
Mounting guest file system using sshfs
PetaLinux. Setting up a web server
PetaLinux. Using cgi scripts
PetaLinux. Web enabled application
Convert from VirtualBox to VMware
Running Linaro Ubuntu on ZedBoard
Running Android on ZedBoard
Lab2. Booting from SD card and SPI flash
Lab2. PetaLinux board bringup
Lab2. Writing userspace IO device driver
Lab2. Hardware debugging
MicroZed quick start
Installing Vivado 2014.1
Lab3. Adding push buttons to our Zynq system
Lab3. Adding an interrupt service routine
Installing Ubuntu 14.04
Installing Vivado and Petalinux 2014.2
Using Vivado 2014.2
Upgrading to Ubuntu 14.04
Using Petalinux 2014.2
Booting from SD card and SPI flash
Booting Petalinux 2014.2 from SD card

Chipotle Verification System
Introduction

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
Introduction
Table of contents
Leon3
MicroBlaze
OpenRISC 1200
Nios II

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

FPGA Design From Scratch
Started December 2006
Introduction
Table of contents
Index
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

CAD
A hardware designer's best friend
Zoo Design Platform

Linux
Installing Cobra Command Tool
A processor benchmark

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

Running
The New York City Marathon

Skiing/Skating
Kittelfjall Lappland

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

Travel
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

Books
100 Power Tips for FPGA Designers

Favorites
Adventures in ASIC
ChipHit
Computer History Museum
DeepChip
Design & Reuse
Dilbert
d9 Tech Blog
EDA Cafe
EDA DesignLine
Eli's tech Blog
Embedded.com
EmbeddedRelated.com
FPGA Arcade
FPGA Blog
FPGA Central
FPGA CPU News
FPGA developer
FPGA Journal
FPGA World
Lesley Shannon Courses
Mac 2 Ubuntu
Programmable Logic DesignLine
OpenCores
Simplehelp
SOCcentral
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_HIGHADDR 0x41F0CFFF
#define XPAR_LCD_16X2_DEVICE_ID 3
#define XPAR_LCD_16X2_INTERRUPT_PRESENT 0
#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


//$$DEFINE
/*************************************************************************/
/*                                                                       */
/*                  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.
 
  #define GPIO_LCD_DEVICE_ID    XPAR_LCD_16X2_DEVICE_ID
  #define GPIO_LED4_DEVICE_ID   XPAR_LEDS_4BIT_DEVICE_ID
  #define GPIO_LEDP_DEVICE_ID   XPAR_LEDS_POSITIONS_DEVICE_ID

  // 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 */
 
/$$MAIN
/*************************************************************************/
/*                                                                       */
/*                        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
    XromLCDInit();

    // Send single characters to the LCD
    print("Send Hello World to the LCD ");
    XromLCDPrintChar('H');
   
XromLCDPrintChar("e");
   
XromLCDPrintChar("l");   
   
XromLCDPrintChar("l");   
   
XromLCDPrintChar("o");
   
XromLCDPrintChar(" ");
   
XromLCDPrintChar("W");
   
XromLCDPrintChar("o");   
   
XromLCDPrintChar("r");   
   
XromLCDPrintChar("l");
   
XromLCDPrintChar("d");
           
    print("Hello World is displayed on the LCD display ");           
    while(1);

    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 svenand

Nabeel Khan
October 10, 2009   10:16 PM PDT
 
Great Work ... keep it up
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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