# SWHarden.com

The personal website of Scott W Harden

# Debut of the AJ4VD QRSS Gator

``` qrss``` ``` obsolete```

I re-wrote the code from the previous entry to do several things. Once of which was to make a gator rather than a fish. It’s more appropriate since I’m planning on housing the transmitter at the University of Florida. To do it, I drew a gator in paint and wrote a python script to convert the image into a series of points. I’ll post it later. One thing to note was that size was a SERIOUS issue. I only have two thousand bytes of code, and every point of that gator was a byte, so it was a memory hog. I helped it dramatically by using repeating segments wherever possible, and some creative math to help out the best I could (i.e., the spines on the back) Here’s what it looks like, and the code below it…

``````#include <avr/io.h>
#include <util/delay.h>

// front top LED - PA0
// inside top LED - PA1
// inside bot LED - PA2
// front bot LED - PA3

unsigned long int t_unit; // units of time
const int tDit = 100;     //units for a dit
const int tDah = 255;     //units for a dah
char fsk;                 // degree of frequency shift to use for CW
char fsk2;                // degree of frequency shift to use for HELL

char light = 0; // which lights are on/off

void delay()
{
_delay_loop_2(t_unit);
}

{
return;
if (light == 0)
{
PORTA |= (1 << PA0);  //on
PORTA |= (1 << PA1);  //on
PORTA &= ~(1 << PA2); //off
PORTA &= ~(1 << PA3); //off
light = 1;
}
else
{
PORTA |= (1 << PA2);  //on
PORTA |= (1 << PA3);  //on
PORTA &= ~(1 << PA0); //off
PORTA &= ~(1 << PA1); //off
light = 0;
}
}

void tick(unsigned long ticks)
{
while (ticks > 0)
{
delay();
delay();
ticks--;
}
}

void pwm_init()
{
//Output on PA6, OC1A pin (ATTiny44a)
OCR1A = 0x00;  //enter the pulse width. We will use 0x00 for now, which is 0 power.
TCCR1A = 0x81; //8-bit, non inverted PWM
TCCR1B = 1;    //start PWM
}

void set(int freq, int dly)
{
OCR1A = freq;
tick(dly);
}

void fish()
{
char mult = 3;

char f2[] = {2, 3, 4, 5, 6, 7, 4, 3, 7, 4, 7, 7, 6, 5, 4, 3, 2, 2, 2, 3, 3, 3, 2, 2, 2, 3, 3, 3, 2, 2, 2, 3, 4, 5, 6, 7, 8, 4, 9, 5, 9, 6, 9, 6, 9, 6, 9, 8, 8, 7, 7, 6, 5, 4, 3, 3, 3, 4, 5, 5};

for (int i = 0; i < sizeof(f2); i++)
{
OCR1A = f2[i] * mult;
tick(20);
OCR1A = 1 * mult;
tick(20);
}

char f3[] = {1, 2, 3, 4, 3, 2};

char offset = 0;
while (offset < 9)
{
for (char j = 0; j < 3; j++)
{
for (char i = 0; i < sizeof(f3); i++)
{
char val = (f3[i] + 5 - offset) * mult;
if (val < mult || val > 10 * mult)
{
val = mult;
}
OCR1A = val;
tick(20);
OCR1A = 1 * mult;
tick(20);
}
}
offset++;
}
}

void id()
{
char f[] = {0, 0, 1, 2, 0, 1, 2, 2, 2, 0, 1, 1, 1, 1, 2, 0, 1, 1, 1, 2, 0, 2, 1, 1, 0, 0};
char i = 0;
while (i < sizeof(f))
{
if (f[i] == 0)
{
OCR1A = 0;
tick(tDah);
}
if (f[i] == 1)
{
OCR1A = fsk;
tick(tDit);
}
if (f[i] == 2)
{
OCR1A = fsk;
tick(tDah);
}
OCR1A = 0;
tick(tDit);
i++;
}
}

void slope()
{
char i = 0;
while (i < 25)
{
OCR1A = 255 - i;
i++;
}
while (i > 0)
{
i--;
OCR1A = 255 - i;
}
}

int main(void)
{
DDRA = 255;
pwm_init();
t_unit = 1000;
fsk = 10;
id(); // set to fast and ID once
//fsk=50;//t_unit = 65536; // set to slow for QRSS
t_unit = 60000;

while (1)
{
;
fish();
id();
}

return 1;
}
``````