/*
 * RS232_Send.c
 *
 * Created: 9/10/2015 9:25:23 pm
 * Author : Dimitrios Porlidas
 */ 

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

//#define F_CPU 8000000UL

unsigned char name[] = {'D','i','m','i','t','r','i','o','s',' ','P','o','r','l','i','d','a','s',10,13};
unsigned char i;

void USART_Init( unsigned int baud )						// Initialization routine
{
	UBRRH = (unsigned char)(baud>>8);						// Set baud rate
	UBRRL = (unsigned char)baud;							//

	UCSRB = (1<<RXEN)|(1<<TXEN);							// Enable receiver and transmitter

//	UCSRC = (1<<URSEL)|(0<<USBS)|(3<<UCSZ0);				// Set frame format: 1 stop bit, 8 data, asynchronous operation & no parity (by default)
}

void USART_Transmit( unsigned char data )					// Transmite routine
{
	while ( !( UCSRA & (1<<UDRE)) );						// Wait for empty transmit buffer

	UDR = data;												// Put data into buffer, sends the data
}

int main(void)
{
	DDRC = 0b00000000;										// Port C inputs
	PORTC = 0b11111111;										// Enable pull up resistors
	USART_Init(8);											// Clock 8MHz: 51->9600, 34->14400, 25->19200, 16->28800*, 12->38400, 8->57600, 6->76800, 3->115200** (*Error magnitude)
	while (1)												
	{
		while ((PINC == 0b11111110) | (PINC == 0b11111101))	// Check buttons 0 & 1
		{
			
			_delay_ms(10);
			switch (PINC)									// command "switch" example
			{
				case 0b11111110:							// Button 0 pressed
				for (i = 0; i < 20; i++)
//				{
//					_delay_us(10);					
					USART_Transmit(name[i]);				// Send my name
//				}
				while (PINC == 0b11111110);					// Wait if button is still pressed
				break;

				case 0b11111101:							// Button 1 pressed
				USART_Transmit(12);							// Clear screen
				while (PINC == 0b11111101);					// Wait if button is still pressed
				break;
			}
		}
	}
}