/*================================================================================================
 
 usart.c							SiWiCom copyright 2006		  	   		   v1.0 (2006-05-22)
 
 Name: Christoffer Martinsson 	E-mail: cm@cmtec.se 
 Name: Joakim Nilsson 			E-mail: mail@jopin.se

 Description: Routines for USART
 
 USART configuration is done by hardware.h witch must contain the following definitions:
 (X=letter i.e PORTX=PORTB, n=number i.e PXn=PB4)		

 		USART_DDR	DDRX	(Example: #define USART_DDR		DDRD) 	
		USART_PORT	PORTX	(Example: #define USART_PORT 	PORTD)
		USART_RX	PXn		(Example: #define USART_RX		PD0)	
		USART_TX	PXn 	(Example: #define USART_TX		PD1)			
					
================================================================================================*/
#include <hardware.h>

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

#include <usart.h>

/*================================================================================================
 Functions
================================================================================================*/
/*================================================================================================
 usartSetBaud
 
 Description: 	Set baudrate. Input value should be acording to following formula: 
				baud = ((F_CPU/(8*BAUDRATE))-1)
 
 Input: baud (uint8_t ((F_CPU/(8*BAUDRATE))-1))
 Return: -
------------------------------------------------------------------------------------------------*/
void usartSetBaud(uint16_t baud)
{
	UCSR0A |= (1<<U2X0);
	UBRR0H = (uint8_t )(baud>>8);
	UBRR0L = (uint8_t )(baud);
}
/*================================================================================================
 usartReceive
 
 Description: Get byte from input buffer.
 
 Input: -
 Return: UDR (uint8_t)
------------------------------------------------------------------------------------------------*/
uint8_t usartReceive( void )
{
	/* Wait for data to be received */
	while ( !(UCSR0A & (1<<RXC0)) );
	/* Get and return received data from buffer */
	return UDR0;
}
/*================================================================================================
 usartSend
 
 Description: Send byte to USART.
 
 Input: data (uint8_t data byte to be send)
 Return: -
------------------------------------------------------------------------------------------------*/
void usartSend(uint8_t data)
{
	/* Wait for empty transmit buffer */
	while ( !( UCSR0A & (1<<UDRE0)) );
	/* Put data into buffer, sends the data */
	UDR0 = data;
}
/*================================================================================================
 usartSendString
 
 Description: Write a string of characters to the USART.

 Input: *stringPointer (uint8_t array)
 Return: -
------------------------------------------------------------------------------------------------*/
void usartSendString (uint8_t *stringPointer)
{

	while(*stringPointer)
	{
		usartSend(*stringPointer);
		stringPointer++;
	}
	
}
/*================================================================================================
 usartEnable
 
 Description: Enable USART function.
 
 Input: -
 Return: -
------------------------------------------------------------------------------------------------*/
void usartEnable(void)
{
	USART_DDR |= (1<<USART_TX);
	UCSR0B |= (1<<RXEN0)|(1<<TXEN0)|(1<<RXCIE0);
}
/*================================================================================================
 usartDisable
 
 Description: Disable USART function.
 
 Input: -
 Return: -
------------------------------------------------------------------------------------------------*/
void usartDisable(void)
{
	USART_DDR &= ~(1<<USART_TX);
	UCSR0B &= ~((1<<RXEN0)|(1<<TXEN0)|(1<<RXCIE0));
	USART_PORT &= ~(1<<USART_TX);
}
/*================================================================================================
 End
================================================================================================*/