Blinkentree

Revision as of 21:51, 6 December 2010

UNDER CONSTRUCTION

**Add your Project**
Blinkentree


Meetings:	none
Type:	hardware
Status:	running
Members:
Contact Person:	slopjong (mail), prometheus (mail)
Tools
QrCode:

"File:" cannot be used as a page name in this wiki.

Introduction

What is this flashing green fir tree about?

As creative hackers, we thought it would be necessary to support the Christmas market of the commune of Strassen with something tiny, but creative. Result? The Blinkentree. Obviously it represents a green fir tree that is dorned with flashing LEDs which should represent the baubles of a 'real' tree.

A big thanks to all of you folks who purchsed a Blinkentree and thus supporting syn2cat Hackerspace.

Hacky Christmas!

How to program it on your own?

We designed our Blinkentree in a way you can customize it by yourself. You can define your own flashing patterns using the C language that you can transfer to your chip using the USBasp programmer.

Installing and confguring the tools

This section describes what you need to program the chip. First you need the toolchain with the compiler which translates your program text into bits and bytes that the controller can execute. We are using the GCC compiler which is part of the WinAVR (Windows) and CrossPack-AVR (Mac).

If you use Windows download WinAVR and follow the installtion guide. When the installer asks to make an entry in the PATH variable be sure this is checked.

For a mac you have to download CrossPack AVR. The toolchain is installed into /usr/local/CrossPack-AVR ^[1]. Have a look if the installer did add an entry to the PATH variable by typing the following line in your shell (Terminal):

echo $PATH

If it doesn't contain /usr/local/CrossPack-AVR/bin execute this in your shell:

echo -e " \n \n export PATH=/usr/local/CrossPack-AVR/bin:$PATH" >> ~/.profile

For both Windows and Mac chose a good editor like Notepad++ or Programmers Notepad for Windows and TextWrangler for Mac.

Coding

Programming new flashing patterns for your Blinkentree is very easy. Here is a sample code:

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#include &lt;avr/io.h&gt; 
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#include &lt;util/delay.h&gt;
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int main(void) { 
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    // configure the ports as outputs 
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    DDRD = 0xFF;
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    DDRB = 0xFF;
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    while(1)
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    {
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            PORTB = 255;
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            PORTD = 0;
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            _delay_ms(400);
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            PORTB = 0;
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            PORTD = 255;
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            _delay_ms(400);
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    }
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} 
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<syntaxhighlight/>
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```
 
```

On [https://iamsuhasm.wordpress.com/tutsproj/avr-gcc-tutorial/ Suhas's blog] you find more information about the I/O operations. If we have some time we will update this site to provide you with a mini coding tutorial for AVR microcontrollers.

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=== Compiling and linking ===
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After you're done with the programming, the code must be translated into machine code that can be executed by the microcontroller.

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<pre>
```

avr-gcc -Wall -Os -std=c99 -DF_CPU=1000000 -mmcu=attiny2313 -c main.c -o main.o

avr-gcc -Wall -Os -std=c99 -DF_CPU=1000000 -mmcu=attiny2313 -o main.elf main.o

avr-objcopy -O ihex -R .eeprom main.elf main.hex

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</pre>
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You can use the compile.sh script. 
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=== Setting the fuse bits ===
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Before the compiled code can be loaded into the microcontroller it has to be configured first. This is done by setting the fuse bits. Thus you execute the following line:

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<pre>
```

sudo avrdude -cUSBasp -p t2313 -U lfuse:w:0x64:m -U hfuse:w:0xdf:m -U efuse:w:0xff:m

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</pre>
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There are three fuse bytes ( = 24 bits in total). collection of bits stands for a base or a module configuration (Fuse Bits, page 160). Use the fusecalc to be sure to have the right ones.

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=== Flashing the microcontroller ===
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<pre>
```

sudo avrdude -c USBasp -p t2313 -U flash:w:main.hex -v -F

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</pre>
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== References ==
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== Footnotes ==
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<references />
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Cite error: <ref> tags exist, but no <references/> tag was found

[1]

Blinkentree

Revision as of 21:51, 6 December 2010

Contents

Introduction

How to program it on your own?

Installing and confguring the tools

Coding

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@@ Line 47: / Line 47: @@
 Programming new flashing patterns for your Blinkentree is very easy. Here is a sample code:
-<syntaxhighlight lang="C" line="GESHI_NORMAL_LINE_NUMBERS" enclose"pre">
+<syntaxhighlight lang="C" line="GESHI_NORMAL_LINE_NUMBERS">
 #include &lt;avr/io.h&gt;
 #include &lt;util/delay.h&gt;