/*this program is to test the microcontroller uart working or not by sending 0x99 to the
uart and reading it using Rx and sending it to port. Change the Port to PortA or PortB if
you had not disabled JTAG
*/



/*----------------------------------------------------------------
-----------------HEADER FILES-------------------------------------
-----------------------------------------------------------------*/
#include <avr/io.h>

/*----------------------------------------------------------------
-----------------DEFINITIONS------------------------------------
-----------------------------------------------------------------*/

#define Receive_DDR   DDRC
#define Receive_PORT  PORTC //don't forget to disable JTAG, otherwise change port to PORTB or PORTA
/*----------------------------------------------------------------
-----------------FUNCTIONS---------------------------------------
-----------------------------------------------------------------*/

void InitUART( unsigned char baudrate );
unsigned char ReceiveByte( void );
void TransmitByte( unsigned char data );
void Init_Ports(void);

/*----------------------------------------------------------------
-----------------MAIN FUNCTION------------------------------------
-----------------------------------------------------------------*/
  
  int main()
  {
	unsigned char a;
	//lcd initializationsa
	
	Init_Ports();
	
    InitUART( 25 ); /* Set the baudrate to 2400 bps using a 1MHz crystal */
    for(;;)              /* Forever */
    {
    
		a=ReceiveByte();	//Receive the data
		TransmitByte(a); /*  Echo the received   character */		
    }
	
  }
  
/*----------------------------------------------------------------
------------FUNCTIONS TO Initialize UART--------------------------
-----------------------------------------------------------------*/

 void InitUART( unsigned char baudrate )
  {
    UBRRL =  baudrate;                   /*  Set the baud rate */
    UCSRB = (UCSRB | _BV(RXEN) | _BV(TXEN) );  /* Enable UART   receiver and transmitter */
  }
/*----------------------------------------------------------------
------------FUNCTIONS TO READ UART-------------------------------
-----------------------------------------------------------------*/
  unsigned char ReceiveByte( void )
  {
   while ( !(UCSRA &  (_BV(RXC))) );     /*  Wait for incomming data   */
   return UDR;/* Return the   data */
  }

/*----------------------------------------------------------------
------------FUNCTIONS TO WRITE UART-------------------------------
-----------------------------------------------------------------*/
  void TransmitByte( unsigned char data )
  {
   while ( !(UCSRA & (_BV(UDRE))) );        /* Wait for   empty transmit buffer */
   UDR =  data;  /* Start transmittion   */
  }
  
  
  
  void Init_Ports(void)
  {
  Receive_DDR=0xFF; //setting that port for output
  Receive_PORT=0XFF; //setting all bits high for starting
  }