Arduino on CentOS 5

So I bit the bullet and bought an Arduino UNO. The packaging should have a label on it "WARNING: BY OPENING THIS PACKAGE YOU RECOGNISE YOU WILL GET NO USEFUL WORK DONE TODAY."

All I wanted was to get one LED to flash. But that requires a avr-cpp-g++, which isn't available for CentOS 5. GRRRR!

So I wasted to much time getting the CentOS 6 SRPMs and getting them to compile. But you may fetch them from my psuedo-repo.

While time was a wasting, a kind soul on IRC sent me a hex file for bitlash which I managed to upload to the board. This allowed me to flash a few LEDs and get on with my work.

Writing code for the Arduino Uno in CentOS 5

RPMs will need from the psuedo-repo

avr-libc-1.7.0-1.noarch.rpm

avr-libc-docs-1.7.0-1.noarch.rpm

avr-binutils-2.20-2.x86_64.rpm

avrdude-5.10-1.x86_64.rpm

avr-gcc-4.5.0-2.x86_64.rpm

avr-gcc-c++-4.5.0-2.x86_64.rpm

gmp-4.3.1-7.x86_64.rpm

gmp-devel-4.3.1-7.x86_64.rpm

gmp-static-4.3.1-7.x86_64.rpm

libmpc-0.8-3.x86_64.rpm

libmpc-devel-0.8-3.x86_64.rpm

mpfr-2.4.1-6.x86_64.rpm

mpfr-devel-2.4.1-6.x86_64.rpm

You will also need arduino-0022.tar.gz, which I installed in /opt/arduino.

Now the IDE works, but it's in Java. Which hates me, hates Linux and I hate Java just as much, just for good measure I also hate IDEs. Working from two tutorials and with some slamming my head into the table, I got it working. The trick was massaging Johan's Makefile into something that worked. I also had to patch /opt/arduino/hardware/arduino/cores/arduino/wiring_private.h.

To start a new project, lets say "blink2"

mkdir blink2

cd blink2

wget http://awale.qc.ca/CentOS/rhel5/Makefile.arduino -O Makefile

wget http://awale.qc.ca/CentOS/rhel5/resetArduino.pl

touch blink2.pde

Now add your code to blink2.pde.

And here is my first Arduino program. It's a 6 LED chaser. It would be more, but I can only find 6 LEDs right now. Pins 13-9 are red, pin 8 is green. The green light stays on twice as long as the others.

#define DELAY 100



int state;

void setup(void) {

    int pin;

    state = 1;

    for(pin=13; pin >=8; pin-- )

        pinMode(pin, OUTPUT);

}



void set_state(void) {

    int pin;

    int mask = 1;

    for(pin=13; pin >=8; pin-- ) {

        digitalWrite( pin, (state & mask) );

        mask <<= 1;

    }



}



void loop(void) {



    if( state == 1 ) {

        state = 3;

    }

    else {

        state = state << 1;

    }

                            /* 0001 1000 = 18 */

                            /* 0011 0000 = 30 */

    if( state == 0x60 ) {   /* 0110 0000 = 60 */

        state = 0x20;

        set_state();

        delay( DELAY*4 );

        state = 1;

    }

                            /* 0100 0010 = 42 */

    else if( state == 0x42 ) {

        state = 3;

    }

    set_state();



    delay(DELAY);

}

Now compile and upload it:

make && sudo make upload