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Programming ATtiny85 with USBASP programmer by using cmd and AVRdude
Programming ATtiny85 with USBASP programmer by using cmd and AVRdude
This short tutorial will be more useful for ones who are new to programming Atmel family microchips, after this tutorial we will get some basic knowledge about using CodeVisionAVR, how to setup a project and we will also cover a little bit of C++ programming.
Before you start going throught this guide, make sure that you have got everything that is in these lists.
Necessary equipment required:
·
USBASP
programmer with a cable
·
Solderless
breadboard
·
Few jumper wire
cables
·
200ohms
resistor
·
1 Led
Programms required:
·
Some kind of
programming environment where to create the code and where to compile it, for
this tutorial I have chosen CodeVisionAVR.
·
AVRDUDE
Schematic view of the circuit:
Short guide on CodeVisionAVR:
I won't be discussing principles how the CodeVisionAVR
works, but instead I will jump straight into creating the project solution.
The first thing to do is of course to start the program
and create a new project (“File -> New -> Project”), a message box will
pop up:
Nothing strange, we want to use it so click on “Yes” and
let's continue, another window will pop up, giving us some of the options
(Target AVR Chip Type):
We need to select the first radio button, which has some
text next to it: “AT90, ATtiny, Atmega”, this is what we need for our project,
so click on “OK”.
Finally we have reached Chip Settings Window: in the
listbox provided next to the “Chip” label you will need to find the chip you
are going to program (ATtiny85), leave other settings as they are, after that
just choose an option: “Program-> Generate, Save and Exit”.
Few File Dialogs will come up, you will need to choose
where to save them, and give a name to them. The best thing to do would be to
create a folder and save these files in that folder:
After everything has been saved, in the main window of
the left side in the Code Navigator, we have our project root with our files,
on the left and the biggest part we have on the right with our code which was
generated previously, now we need to clean it up, leaving some bits (tiny85
library, initialization and the loop):
Now the code can be written, the complete code is
given below.
After you have either rewritten or copied this code (I would highly
suggest to go through it and try to understand all features involved with this
code), the project is ready to be build. To build the project go to:
“Project->Build All”.
If the build was successful, you shouldn't get any errors:
So click, on “OK”, and start AVRdude to program our ATtiny !
Before we actually start the AVRdude, lets prepare our workspace. The
first thing is to set-up our circuit connected to USBASP programmer:
After the circuit has been set up, lets prepare some data needed for
AVRdude:
Attiny85 in AVRdude is
indentified as a part numer t85
Hex file location should be
in : Project_Folder->Debug->Exe->hex_file_name.hex
So my full file path is:
C:\cvavr\projects\ATtiny85_tutorial_1\Debug\Exe\first_project.hex
Full AVRdude command will
look like this:
avrdude.exe -p t85 -c
usbasp -B 4 -e -U
flash:w:"C:\cvavr\projects\ATtiny85_tutorial_1\Debug\Exe\first_project.hex":i
-v
As the AVRdude command is
ready we need to start our Command Prompt, to start the Command Prompt type in
windows search cmd, and it should find it easily.
Type command: cd \ (by that
we are chaning the directory to C:\)
Type another command: cd
Win (and press Tab button on the keyboard, by that it should return the full
folder name WinAVR-20100110 (if the AVRdude was installed by default, otherwise
you will need to find it's location), type “\” and press again Tab untill you
find “bin”, the full command should look something like this: cd
WinAVR-20100110\bin and at the end press “Enter”.
.
The next thing do is to
copy and paste our command which we prepared before: avrdude.exe -p t85 -c
usbasp -B 4 -e -U
flash:w:"C:\cvavr\projects\ATtiny85_tutorial_1\Debug\Exe\first_project.hex":i
-v
To paste that command line
into cmd, we need to do it by Right click on the cmds area with a mouse:
So as our USBASP programmer
at one end is connected to computer's USB port and at another end to our
microcontroller, we are ready to do programming, so just simply press “Enter”
once more and watch.
A lot of thing will be
listed in the cmd screen, but at the end if everything was done correctly you
should see something like that:
Also as soon as the chip
has been programmed the LED should start blinking you can disconnect all the
wires only leaving the VCC and GND wires to the programmer (do it only when
programmer is disconnected from the USB) or instead of using programmers power
source you can connect these wires to your own power source, of course the LED
will only start blinking if during the process no errors were found.
But in case if there are
some kind of errors, check the wiring connections between USBASP cable and
microchip first, and always pay attention to what the compiler and cmd states
at the end of the process.
Thank you for your
attention, hopefully you enjoyed this tutorial, there will be more tutorials
coming up soon, so don't forget to visit us again and share our blog with your
friends !
You can Download FULL tutorial file HERE:
You can Download FULL tutorial file HERE:
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