WinAVR

Start with WINAVR

Instruction Manual to Start with AVT "Plug & Play Kit" with WINAVR

1.      Winavr Download and Installtion

Winavr is a opensource and free available software. Download winavr from the link http://sourceforge.net/projects/winavr/ and install it.

2.      USBASP/Usbtiny Driver installation

·         Connect usbasp/USBTiny programmer to usb port of your computer. Computer will detect usb device and will show dialog box as shown below.

·                     Click button Yes, this time only, then click next button. The wizard will display next dialog box as shown below

 

·         Click on the Install from specified location button→next

·         Now the wizard will ask for windriver  folder as shown below

·         Browse the win-driver folder wherever you have→ next

·         Now the installation starts and will take some time (few seconds).A message will display on the bottom  right corner of taskbar  as shown below.

Now USBASP/UsbTiny driver is installed and you are ready to download data to the microcontroller.

3.      How to start a new project

·         Create a new folder and name it whatever you want.

·         Start menu→ All programs→ winavr→ Programmers Notepad

·         In programmers notepad window, click on File menu→ new→ c/c++

·         Click on File menu→Save As

·         Save this fie in project folder, name the file as main.c

·         Generate a Makefile (discussed in subsequent topic) in same folder

·         Open Makefile in programmer’s Notepad

·         Make five changes in Make file

·         Write your code in main.c

Note: Files needed for successful compilation main.c and Makefile.

4.      How to generate MakeFile

·         Simplest way to get a Make file: Copy a Makefile from any old project to your new project folder.

·         If you don’t have any Make file in your computer, you need to generate it.

·         Click on :StartàAll ProgramsàWINAVR*******àMFile[WINAVR]

·         A window will appear with lots of text written on it.

·         Click on FileàSave As

·         Save this file in your Project folder (don’t change the file name)

5.      Five changes in Makefile

	Variables	Default	Modified
1	MCU name Line #44	# MCU name   MCU = atmega128	# MCU name   MCU = atmega32
2	Processor frequency Line #65	F_CPU = 8000000	F_CPU = 4000000
3	Add extra include file (If you are including extra header files)    Line #83	SRC = $(TARGET).c	SRC = $(TARGET).c lcd_lib.c(for lcd display place lcd_lib .c separated by space)
4	AVRDUDE programmer Name Line #276	AVRDUDE_PROGRAMMER =  STK500	AVRDUDE_PROGRAMMER = usbasp
5	AVRDUDE port Name Line #279	AVRDUDE_PORT = COM1	AVRDUDE_PORT = usb

6.      How to compile and Transfer your program

Note: Connect the usbasp programmer to the usb port of your computer and the other end of the programmer to the BRiCS’ plug & play AVR kit.

·         Write your complete code in file main.c using programmer’s Notepad

·         Click on toolà [WINAVR]Make All to compile your code. If there is no error in your code, it will generate a main.hex file in your project folder. Output window will look like figure as below.

Note: If the Process Exit Code is 0, code has compiled successfully but it does not ensure that your code is right and free from logical errors.

·         Click on toolà[WINAVR]program to download your code to micro-controller using USBASP programmer

·         When the hex file is downloaded in to microcontroller, in the output window you will see the lines as shown in above figure.

·         If you are using parallel port connector use ponyprog to downloadmain.hex file

7.      How to use Ponyprog

·         Install ponyprog on your computer

·         Run ponyprog using link in start menu

·         Click OK on all windows appears

·         Click Setupàcalibration

·         Wait for popup window

·         Click on OK(on popup window)

·         Click on DeviceàAVR microàAtmega32 to select your device

·         Click SetupàInterface setup…

·         A setup window will appear

·         Select parallel

·         Select AVR ISP I/O (the one bellow parallel option)

·         Select lpt1

·         Click Probe to check your programmer. It will show OK if programmer is connected and everything is OK.

·         Click OK

·         Click OK

·         Open your main.hex file using: FileàOpen Device File.

·         It will show lots of hex numbers in window

·         Download your code to micro-controller using: Commandàwrite all

·         Wait for successful download

8.      Sample code to blink LEDs on port B and port D:

#include <avr/io.h>                    //  header file

#include <util/delay.h>               //   header file

int main(void)                        // main function

{

DDRB=0xFF;           //port B enabled

DDRD=0xFF;           //port D enabled

int i=0;             //A variable i and enabled to 0

while (1)

{

for(i=1;i<256;i=i*2){PORTB=i;_delay_ms(100);}  //port B pins will be on from 1 to 8 after           every  100 miliseconds

for(i=1;i<256;i=i*2){PORTD=i;_delay_ms(100);}  //port B pins will be on from 1 to 8 after    every 100 miliseconds

}

return 0;                                       //return nothing to main function

}

9.      Sample code to print string on 16*2 LCD screen:

#include <avr/io.h>                //  header file

#include <util/delay.h>            //  header file

#include "lcd_lib.h"               //extra  header file included for LCD

int main(void)                     // main function

{

LCDinit();         //Initializes LCD              

LCDclr();          //Clears LCD

while (1)

{

LCDGotoXY(5,0);   //Cursor to (5,0) position

LCDstring("BRiCS",5);   //Outputs string to LCD

_delay_ms(10);          //delay of 10 miliseconds

LCDGotoXY(0,1);         //Cursor to (0,1) position

LCDstring("A Step Towards Future",21); //Outputs string to LCD

LCDshiftRight(1);     //shift by 1 character Right        

_delay_ms(100);        //delay of 10 miliseconds

}

return 0;             //return nothing to main function

}