Megaprg Tutorial

8/14/2019 Megaprg Tutorial

http://slidepdf.com/reader/full/megaprg-tutorial 1/8



MEGAPRG_TUTORIAL.PDF

of 8

• After installing the software (found in the megaprg directory), you should prepare the

microcontroller hardware circuit. Almost 95% of ATMEL AVR microcontrollers are in

circuit programmable and only 4 pins need to be connected between the microcontroller

and the MRGAPRG. Those pins are MOSI, MISO, SCK, and RST.

• So as a start, select a certain AVR microcontroller (for example ATMEGA8515) and

from its datasheet (found in the "datasheet" directory) define those 4 programming pins.

• You can follow the following complete example to understand how to use MEGAPRG.

Suppose you want to program ATMEGA8515 microcontroller so that it flashes a LED

connected to PA0 every second.




of 8

1- Prepare a proper schematic for the circuit as shown below.




of 8

2- prepare the components and connect the previous schematic on a bread board asshown. Note that it is highly recommended to separate the 4 programming pins as

well as the GND and VCC so that they will be easily connected to the programming

adapter.




of 8

3- Connect the programming adapter to the bread board as shown.




of 8

4- Connect the 10 way flat cable to the programming adapter from one side and to the

MEGAPRG programmer (which is connected to the PC Parallel port) from the other

side.

5- Finally supply the microcontroller circuit with a regulated 5v supply (you can use

SUPMOD module). Now the hardware is ready.

6- Download the ZIP file “megaprg_test.zip” which contains a CodeVision compiled

project that will achieve the flasher job.

7- unzip the file and make sure that the file “megaprg_test.hex” is there. Later you willshould write your own C or assembly codes and compile them to hex files.




of 8

8- Power ON your board and start MegaPrg software. You should notice that the software

is initialized successfully and the LED on the bread board adapter should be ON. Now

follow the following sequence

a- select the specific AVR chip you are using (ATMEGA8515 in this case)

b- load the hex file (File-> Load-> Flash)

c- erase the chip (Device -> Erase)

d- program the chip (Device -> Program -> Flash)e- verify the chip (Device -> Verify -> Flash). If everything is OK, the data in the

program window will be in green. If there is something wrong, the data will be

in red.




of 8

9- since ATMEGA devices comes with a built in 1MHz RC oscillator, the microcontroller will not operate from the external 4 MHz oscillator. To let the controller execute the

program with the speed of the external source, you should program the fuses using the

following steps.

a) Display the fuses (View->Fuse & Lockbits)

b) Change to external clock source by Un-checking CKSEL0, CKSEL1,CKSEL2, and CKSEL3.

c) Program the fuses (Device -> Program -> Fuses)

10- Run your microcontroller program (Device -> Run). The LED on the breadboardadapter should be OFF and The Green LED connected to PA0 will flash every sec-

ond.

11- You can now push the reset button in the program and repeat the programming cycle

after modifying your code (the programming adapter LED should be ON again).

12- Finally, if you remove the programming adapter from the breadboard, you will find

the green LED flashing and now you have your first stand-alone embedded applica-

tion.

Megaprg Tutorial

Documents

Transcript of Megaprg Tutorial