/****
 * Interrupt-driven Hardware UART Serial Driver
 * Henry Chan (hc352@cornell.edu)
 * Based on interrupt-driver serial code by Bruce Land
 ****/
#ifndef SERIAL_H
#define SERIAL_H

#include <stdio.h>
#include <avr/interrupt.h>
#include "uart.h"

extern FILE uart_str; 

// Receiving end
// Position in serial_rx_buffer
extern volatile char serial_rx_index;
// Buffer to hold received string
extern volatile char serial_rx_buffer[16];
// Flag for ready when return entered
extern volatile char serial_rx_ready;
// Save character
extern volatile char serial_rx_char;

// Transmitting end
// Position in the serial_tx_buffer
extern volatile char serial_tx_index;
// Buffer to hold transmitting string
extern volatile char serial_tx_buffer[16];
// Flag for ready once transmission is complete
extern volatile char serial_tx_ready;
// Current character to send
extern volatile char tx_char;

// Hardware control of receiveing
ISR(USART0_RX_vect);
// Hardware control of transmitting
ISR(USART0_UDRE_vect);
/****
 * Initialize ISRs for Hardware Serial
 ****/
void serial_initialize();

/****
 * Sets the hardware serial up to receive a string
 ****/
char serial_getstr();

/****
 * Sets the hardware serial up to send a string
 ****/
char serial_putstr();
#endif