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+#ifndef USART_H
+#define USART_H
+
+/************************************************************************
+Title: Interrupt UART library with receive/transmit circular buffers
+Author: Andy Gock
+Software: AVR-GCC 4.1, AVR Libc 1.4
+Hardware: any AVR with built-in UART, tested on AT90S8515 & ATmega8 at 4 Mhz
+License: GNU General Public License
+Usage: see README.md and Doxygen manual
+
+Based on original library by Peter Fluery, Tim Sharpe, Nicholas Zambetti.
+
+https://github.com/andygock/avr-uart
+
+LICENSE:
+
+ Copyright (C) 2012 Andy Gock
+ Copyright (C) 2006 Peter Fleury
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+************************************************************************/
+
+/************************************************************************
+uart_available, uart_flush, uart1_available, and uart1_flush functions
+were adapted from the Arduino HardwareSerial.h library by Tim Sharpe on
+11 Jan 2009. The license info for HardwareSerial.h is as follows:
+
+ HardwareSerial.h - Hardware serial library for Wiring
+ Copyright (c) 2006 Nicholas Zambetti. All right reserved.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+************************************************************************/
+
+/**
+ * @defgroup avr-uart UART Library
+ * @code #include <uart.h> @endcode
+ *
+ * @brief Interrupt UART library using the built-in UART with transmit and receive circular buffers.
+ * @see README.md
+ *
+ * This library can be used to transmit and receive data through the built in UART.
+ *
+ * An interrupt is generated when the UART has finished transmitting or
+ * receiving a byte. The interrupt handling routines use circular buffers
+ * for buffering received and transmitted data.
+ *
+ * The UART_RXn_BUFFER_SIZE and UART_TXn_BUFFER_SIZE constants define
+ * the size of the circular buffers in bytes. Note that these constants must be a power of 2.
+ *
+ * You need to define these buffer sizes as a symbol in your compiler settings or in uart.h
+ *
+ * See README.md for more detailed information. Especially that relating to symbols: USARTn_ENABLED and USARTn_LARGE_BUFFER
+ *
+ * @author Andy Gock <andy@gock.net>
+ * @note Based on Atmel Application Note AVR306 and original library by Peter Fleury and Tim Sharpe.
+ */
+
+/**@{*/
+#include <stdint.h>
+#include <avr/io.h>
+
+#if (__GNUC__ * 100 + __GNUC_MINOR__) < 304
+#error "This library requires AVR-GCC 3.4 or later, update to newer AVR-GCC compiler !"
+#endif
+
+/*
+ * constants and macros
+ */
+
+/* Enable USART 1, 2, 3 as required */
+/* Can be defined in compiler symbol setup with -D option (preferred) */
+#ifndef USART0_ENABLED
+ #define USART0_ENABLED /**< Enable USART0 */
+#endif
+//#define USART1_ENABLED
+//#define USART2_ENABLED
+//#define USART3_ENABLED
+
+/* Set size of receive and transmit buffers */
+
+#ifndef UART_RX0_BUFFER_SIZE
+ #define UART_RX0_BUFFER_SIZE 128 /**< Size of the circular receive buffer, must be power of 2 */
+#endif
+#ifndef UART_RX1_BUFFER_SIZE
+ #define UART_RX1_BUFFER_SIZE 128 /**< Size of the circular receive buffer, must be power of 2 */
+#endif
+#ifndef UART_RX2_BUFFER_SIZE
+ #define UART_RX2_BUFFER_SIZE 128 /**< Size of the circular receive buffer, must be power of 2 */
+#endif
+#ifndef UART_RX3_BUFFER_SIZE
+ #define UART_RX3_BUFFER_SIZE 128 /**< Size of the circular receive buffer, must be power of 2 */
+#endif
+
+#ifndef UART_TX0_BUFFER_SIZE
+ #define UART_TX0_BUFFER_SIZE 128 /**< Size of the circular transmit buffer, must be power of 2 */
+#endif
+#ifndef UART_TX1_BUFFER_SIZE
+ #define UART_TX1_BUFFER_SIZE 128 /**< Size of the circular transmit buffer, must be power of 2 */
+#endif
+#ifndef UART_TX2_BUFFER_SIZE
+ #define UART_TX2_BUFFER_SIZE 128 /**< Size of the circular transmit buffer, must be power of 2 */
+#endif
+#ifndef UART_TX3_BUFFER_SIZE
+ #define UART_TX3_BUFFER_SIZE 128 /**< Size of the circular transmit buffer, must be power of 2 */
+#endif
+
+/* Check buffer sizes are not too large for 8-bit positioning */
+
+#if (UART_RX0_BUFFER_SIZE > 256 & !defined(USART0_LARGE_BUFFER))
+ #error "Buffer too large, please use -DUSART0_LARGE_BUFFER switch in compiler options"
+#endif
+
+#if (UART_RX1_BUFFER_SIZE > 256 & !defined(USART1_LARGE_BUFFER))
+ #error "Buffer too large, please use -DUSART1_LARGE_BUFFER switch in compiler options"
+#endif
+
+#if (UART_RX2_BUFFER_SIZE > 256 & !defined(USART2_LARGE_BUFFER))
+ #error "Buffer too large, please use -DUSART2_LARGE_BUFFER switch in compiler options"
+#endif
+
+#if (UART_RX3_BUFFER_SIZE > 256 & !defined(USART3_LARGE_BUFFER))
+ #error "Buffer too large, please use -DUSART3_LARGE_BUFFER switch in compiler options"
+#endif
+
+/* Check buffer sizes are not too large for *_LARGE_BUFFER operation (16-bit positioning) */
+
+#if (UART_RX0_BUFFER_SIZE > 32768)
+ #error "Buffer too large, maximum allowed is 32768 bytes"
+#endif
+
+#if (UART_RX1_BUFFER_SIZE > 32768)
+ #error "Buffer too large, maximum allowed is 32768 bytes"
+#endif
+
+#if (UART_RX2_BUFFER_SIZE > 32768)
+ #error "Buffer too large, maximum allowed is 32768 bytes"
+#endif
+
+#if (UART_RX3_BUFFER_SIZE > 32768)
+ #error "Buffer too large, maximum allowed is 32768 bytes"
+#endif
+
+/** @brief UART Baudrate Expression
+ * @param xtalCpu system clock in Mhz, e.g. 4000000L for 4Mhz
+ * @param baudRate baudrate in bps, e.g. 1200, 2400, 9600
+ */
+#define UART_BAUD_SELECT(baudRate,xtalCpu) (((xtalCpu)+8UL*(baudRate))/(16UL*(baudRate))-1UL)
+
+/** @brief UART Baudrate Expression for ATmega double speed mode
+ * @param xtalCpu system clock in Mhz, e.g. 4000000L for 4Mhz
+ * @param baudRate baudrate in bps, e.g. 1200, 2400, 9600
+ */
+#define UART_BAUD_SELECT_DOUBLE_SPEED(baudRate,xtalCpu) ((((xtalCpu)+4UL*(baudRate))/(8UL*(baudRate))-1)|0x8000)
+
+/* test if the size of the circular buffers fits into SRAM */
+
+#if defined(USART0_ENABLED) && ( (UART_RX0_BUFFER_SIZE+UART_TX0_BUFFER_SIZE) >= (RAMEND-0x60))
+ #error "size of UART_RX0_BUFFER_SIZE + UART_TX0_BUFFER_SIZE larger than size of SRAM"
+#endif
+
+#if defined(USART1_ENABLED) && ( (UART_RX1_BUFFER_SIZE+UART_TX1_BUFFER_SIZE) >= (RAMEND-0x60))
+ #error "size of UART_RX1_BUFFER_SIZE + UART_TX1_BUFFER_SIZE larger than size of SRAM"
+#endif
+
+#if defined(USART2_ENABLED) && ( (UART_RX2_BUFFER_SIZE+UART_RX2_BUFFER_SIZE) >= (RAMEND-0x60))
+ #error "size of UART_RX2_BUFFER_SIZE + UART_TX2_BUFFER_SIZE larger than size of SRAM"
+#endif
+
+#if defined(USART3_ENABLED) && ( (UART_RX3_BUFFER_SIZE+UART_RX3_BUFFER_SIZE) >= (RAMEND-0x60))
+ #error "size of UART_RX3_BUFFER_SIZE + UART_TX3_BUFFER_SIZE larger than size of SRAM"
+#endif
+
+/*
+** high byte error return code of uart_getc()
+*/
+#define UART_FRAME_ERROR 0x0800 /**< Framing Error by UART */
+#define UART_OVERRUN_ERROR 0x0400 /**< Overrun condition by UART */
+#define UART_BUFFER_OVERFLOW 0x0200 /**< receive ringbuffer overflow */
+#define UART_NO_DATA 0x0100 /**< no receive data available */
+
+/* Macros, to allow use of legacy names */
+
+/** @brief Macro to initialize USART0 (only available on selected ATmegas) @see uart0_init */
+#define uart_init(b) uart0_init(b)
+
+/** @brief Macro to get received byte of USART0 from ringbuffer. (only available on selected ATmega) @see uart0_getc */
+#define uart_getc() uart0_getc()
+
+/** @brief Macro to peek at next byte in USART0 ringbuffer */
+#define uart_peek() uart0_peek()
+
+/** @brief Macro to put byte to ringbuffer for transmitting via USART0 (only available on selected ATmega) @see uart0_putc */
+#define uart_putc(d) uart0_putc(d)
+
+/** @brief Macro to put string to ringbuffer for transmitting via USART0 (only available on selected ATmega) @see uart0_puts */
+#define uart_puts(s) uart0_puts(s)
+
+/** @brief Macro to put string from program memory to ringbuffer for transmitting via USART0 (only available on selected ATmega) @see uart0_puts_p */
+#define uart_puts_p(s) uart0_puts_p(s)
+
+/** @brief Macro to return number of bytes waiting in the receive buffer of USART0 @see uart0_available */
+#define uart_available() uart0_available()
+
+/** @brief Macro to flush bytes waiting in receive buffer of USART0 @see uart0_flush */
+#define uart_flush() uart0_flush()
+
+/*
+** function prototypes
+*/
+
+/**
+ @brief Initialize UART and set baudrate
+ @param baudrate Specify baudrate using macro UART_BAUD_SELECT()
+ @return none
+*/
+/*extern*/void uart0_init(uint16_t baudrate);
+
+
+/**
+ * @brief Get received byte from ringbuffer
+ *
+ * Returns in the lower byte the received character and in the
+ * higher byte the last receive error.
+ * UART_NO_DATA is returned when no data is available.
+ *
+ * @return lower byte: received byte from ringbuffer
+ * @return higher byte: last receive status
+ * - \b 0 successfully received data from UART
+ * - \b UART_NO_DATA
+ * <br>no receive data available
+ * - \b UART_BUFFER_OVERFLOW
+ * <br>Receive ringbuffer overflow.
+ * We are not reading the receive buffer fast enough,
+ * one or more received character have been dropped
+ * - \b UART_OVERRUN_ERROR
+ * <br>Overrun condition by UART.
+ * A character already present in the UART UDR register was
+ * not read by the interrupt handler before the next character arrived,
+ * one or more received characters have been dropped.
+ * - \b UART_FRAME_ERROR
+ * <br>Framing Error by UART
+ */
+/*extern*/uint16_t uart0_getc(void);
+
+/**
+ * @brief Peek at next byte in ringbuffer
+ *
+ * Returns the next byte (character) of incoming UART data without removing it from the
+ * internal ring buffer. That is, successive calls to uartN_peek() will return the same
+ * character, as will the next call to uartN_getc().
+ *
+ * UART_NO_DATA is returned when no data is available.
+ *
+ * @return lower byte: next byte in ringbuffer
+ * @return higher byte: last receive status
+ * - \b 0 successfully received data from UART
+ * - \b UART_NO_DATA
+ * <br>no receive data available
+ * - \b UART_BUFFER_OVERFLOW
+ * <br>Receive ringbuffer overflow.
+ * We are not reading the receive buffer fast enough,
+ * one or more received character have been dropped
+ * - \b UART_OVERRUN_ERROR
+ * <br>Overrun condition by UART.
+ * A character already present in the UART UDR register was
+ * not read by the interrupt handler before the next character arrived,
+ * one or more received characters have been dropped.
+ * - \b UART_FRAME_ERROR
+ * <br>Framing Error by UART
+ */
+/*extern*/uint16_t uart0_peek(void);
+
+/**
+ * @brief Put byte to ringbuffer for transmitting via UART
+ * @param data byte to be transmitted
+ * @return none
+ */
+/*extern*/void uart0_putc(uint8_t data);
+
+
+/**
+ * @brief Put string to ringbuffer for transmitting via UART
+ *
+ * The string is buffered by the uart library in a circular buffer
+ * and one character at a time is transmitted to the UART using interrupts.
+ * Blocks if it can not write the whole string into the circular buffer.
+ *
+ * @param s string to be transmitted
+ * @return none
+ */
+/*extern*/void uart0_puts(const char *s);
+
+
+/**
+ * @brief Put string from program memory to ringbuffer for transmitting via UART.
+ *
+ * The string is buffered by the uart library in a circular buffer
+ * and one character at a time is transmitted to the UART using interrupts.
+ * Blocks if it can not write the whole string into the circular buffer.
+ *
+ * @param s program memory string to be transmitted
+ * @return none
+ * @see uart0_puts_P
+ */
+/*extern*/void uart0_puts_p(const char *s);
+
+/**
+ * @brief Macro to automatically put a string constant into program memory
+ * \param __s string in program memory
+ */
+#define uart_puts_P(__s) uart0_puts_p(PSTR(__s))
+
+/** @brief Macro to automatically put a string constant into program memory */
+#define uart0_puts_P(__s) uart0_puts_p(PSTR(__s))
+
+/**
+ * @brief Return number of bytes waiting in the receive buffer
+ * @return bytes waiting in the receive buffer
+ */
+/*extern*/uint16_t uart0_available(void);
+
+/**
+ * @brief Flush bytes waiting in receive buffer
+ */
+/*extern*/void uart0_flush(void);
+
+
+/** @brief Initialize USART1 (only available on selected ATmegas) @see uart_init */
+/*extern*/void uart1_init(uint16_t baudrate);
+
+/** @brief Get received byte of USART1 from ringbuffer. (only available on selected ATmega) @see uart_getc */
+/*extern*/uint16_t uart1_getc(void);
+
+/** @brief Peek at next byte in USART1 ringbuffer */
+/*extern*/uint16_t uart1_peek(void);
+
+/** @brief Put byte to ringbuffer for transmitting via USART1 (only available on selected ATmega) @see uart_putc */
+/*extern*/void uart1_putc(uint8_t data);
+
+/** @brief Put string to ringbuffer for transmitting via USART1 (only available on selected ATmega) @see uart_puts */
+/*extern*/void uart1_puts(const char *s);
+
+/** @brief Put string from program memory to ringbuffer for transmitting via USART1 (only available on selected ATmega) @see uart_puts_p */
+/*extern*/void uart1_puts_p(const char *s);
+
+/** @brief Macro to automatically put a string constant into program memory of USART1 @see uart1_puts_p */
+#define uart1_puts_P(__s) uart1_puts_p(PSTR(__s))
+
+/** @brief Return number of bytes waiting in the receive buffer of USART1 */
+/*extern*/uint16_t uart1_available(void);
+
+/** @brief Flush bytes waiting in receive buffer of USART1 */
+/*extern*/void uart1_flush(void);
+
+
+/** @brief Initialize USART2 (only available on selected ATmegas) @see uart_init */
+/*extern*/void uart2_init(uint16_t baudrate);
+
+/** @brief Get received byte of USART2 from ringbuffer. (only available on selected ATmega) @see uart_getc */
+/*extern*/uint16_t uart2_getc(void);
+
+/** @brief Peek at next byte in USART2 ringbuffer */
+/*extern*/uint16_t uart2_peek(void);
+
+/** @brief Put byte to ringbuffer for transmitting via USART2 (only available on selected ATmega) @see uart_putc */
+/*extern*/void uart2_putc(uint8_t data);
+
+/** @brief Put string to ringbuffer for transmitting via USART2 (only available on selected ATmega) @see uart_puts */
+/*extern*/void uart2_puts(const char *s);
+
+/** @brief Put string from program memory to ringbuffer for transmitting via USART2 (only available on selected ATmega) @see uart_puts_p */
+/*extern*/void uart2_puts_p(const char *s);
+
+/** @brief Macro to automatically put a string constant into program memory of USART2 @see uart2_puts_p */
+#define uart2_puts_P(__s) uart2_puts_p(PSTR(__s))
+
+/** @brief Return number of bytes waiting in the receive buffer of USART2 */
+/*extern*/uint16_t uart2_available(void);
+
+/** @brief Flush bytes waiting in receive buffer of USART2 */
+/*extern*/void uart2_flush(void);
+
+
+/** @brief Initialize USART3 (only available on selected ATmegas) @see uart_init */
+/*extern*/void uart3_init(uint16_t baudrate);
+
+/** @brief Get received byte of USART3 from ringbuffer. (only available on selected ATmega) @see uart_getc */
+/*extern*/uint16_t uart3_getc(void);
+
+/** @brief Peek at next byte in USART3 ringbuffer */
+/*extern*/uint16_t uart3_peek(void);
+
+/** @brief Put byte to ringbuffer for transmitting via USART3 (only available on selected ATmega) @see uart_putc */
+/*extern*/void uart3_putc(uint8_t data);
+
+/** @brief Put string to ringbuffer for transmitting via USART3 (only available on selected ATmega) @see uart_puts */
+/*extern*/void uart3_puts(const char *s);
+
+/** @brief Put string from program memory to ringbuffer for transmitting via USART3 (only available on selected ATmega) @see uart_puts_p */
+/*extern*/void uart3_puts_p(const char *s);
+
+/** @brief Macro to automatically put a string constant into program memory of USART3 @see uart3_puts_p */
+#define uart3_puts_P(__s) uart3_puts_p(PSTR(__s))
+
+/** @brief Return number of bytes waiting in the receive buffer of USART3 */
+/*extern*/uint16_t uart3_available(void);
+
+/** @brief Flush bytes waiting in receive buffer of USART3 */
+/*extern*/void uart3_flush(void);
+
+/**@}*/
+
+#endif // UART_H
+
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