Arduino OV7670 Port Register Integration

gistfile1.ino

#include <avr/io.h>
#include <avr/interrupt.h>

static inline void serialWrB(uint8_t dat){
	while(!( UCSR0A & (1<<UDRE0))); //wait for byte to transmit
	UDR0=dat;
	while(!( UCSR0A & (1<<UDRE0))); //wait for byte to transmit
}

static void StringPgm(char * str){
	do {
		serialWrB(pgm_read_byte_near(str));
	} while(pgm_read_byte_near(++str));
}

void setup() {
	cli();

    // TODO: These need to be cleaned up to make sense, using 15 and 252 is unacceptable
	DDRC &= ~15; // low d0-d3 camera
	DDRD &= ~252; // d7-d4 and interrupt pins

	delay(3000);
	
	// TODO: These need to be commented and cleaned when I understand them
	UBRR0H=0;
	UBRR0L=207;//0 = 2M baud rate. 1 = 1M baud. 3 = 0.5M. 7 = 250k 207 is 9600 baud rate.
	UCSR0A|=2;//double speed aysnc
	UCSR0B = (1<<RXEN0)|(1<<TXEN0);//Enable receiver and transmitter
	UCSR0C=6;//async 1 stop bit 8bit char no parity bits

	StringPgm(PSTR("READY\n"));

    // Just loop
	while (1) {
	    captureImg(320, 120);
	}
}

static void captureImg(uint16_t wg, uint16_t hg) {
	uint16_t lg2;

	StringPgm(PSTR("===========CAPTURE_BEGIN===========\n"));

	while(!(PIND & B00001000)); // Wait for high VSYNC
	while((PIND & B00001000)); // Wait for low VSYNC

	while(hg--) {
		lg2 = wg;

		while(lg2--) {
			while((PIND & B00000100)); // Wait for low HREF

            // Attempt to read D0-D7 values one by one (I have no idea what I am doing here)
            // Results in NUL values all the time
			UDR0 = (PINC & B00000001);
			UDR0 = (PINC & B00000010);
			UDR0 = (PINC & B00000100);
			UDR0 = (PINC & B00001000);
			UDR0 = (PIND & B00010000);
			UDR0 = (PIND & B00100000);
			UDR0 = (PIND & B01000000);
			UDR0 = (PIND & B10000000);
			
			while(!(PIND & B00000100)); // Wait for high HREF
		}
	}

	StringPgm(PSTR("\n===========CAPTURE_DONE===========n"));
}

void loop() {
    
}