#ifndef UART_H
#define UART_H
/************************************************************************
Title: Interrupt UART library with receive/transmit circular buffers
Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury
File: not valid see "Extension"
($Id: uart.h,v 1.7.2.1 2003/12/27 20:39:14 peter Exp $)
Software: AVR-GCC 3.3/3.4
Hardware: any AVR with built-in UART, tested on AT90S8515 at 4 Mhz and
ATmega16 at 1.8, 3.6, 4 and 8 MHz
Usage: see Doxygen manual
Extensions:uart_puti, uart_puthex_nibble, uart_puthex_byte,
uart_putbin_byte by M.Thomas 9/2004 and 1/2005
************************************************************************/
/**
* @defgroup pfleury_uart UART Library
* @code #include <uart.h> @endcode
*
* @brief Interrupt UART library using the built-in UART with transmit and receive circular buffers.
*
* 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_RX_BUFFER_SIZE and UART_TX_BUFFER_SIZE constants define
* the size of the circular buffers in bytes. Note that these constants must be a power of 2.
* You may need to adapt this size to your target and your application.
*
* @note Based on Atmel Application Note AVR306
* @author Peter Fleury pfleury@gmx.ch http://jump.to/fleury
*/
/*@{*/
#if (__GNUC__ * 100 + __GNUC_MINOR__) < 303
#error "This library requires AVR-GCC 3.3 or later, update to newer AVR-GCC compiler !"
#endif
/*
** constants and macros
*/
/** @brief UART Baudrate Expression
* @param xtalcpu system clock in Mhz
* @param baudrate baudrate in bps, e.g. 1200, 2400, 9600
*/
#define UART_BAUD_SELECT(baudRate,xtalCpu) ((xtalCpu)/((baudRate)*16l)-1)
/** Size of the circular receive buffer, must be power of 2 */
#define UART_RX_BUFFER_SIZE 32
/** Size of the circular transmit buffer, must be power of 2 */
#define UART_TX_BUFFER_SIZE 32
#ifndef P
#define P(s) ({static const char c[] __attribute__ ((progmem)) = s;c;})
#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 */
/*
** function prototypes
*/
/**
@brief Initialize UART and set baudrate
@param baudrate Specify baudrate using macro UART_BAUD_SELECT()
@return none
*/
extern void uart_init(unsigned int 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.
*
* @param void
* @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 unsigned int uart_getc(void);
/**
* @brief Put byte to ringbuffer for transmitting via UART
* @param data byte to be transmitted
* @return none
*/
extern void uart_putc(unsigned char 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 uart_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 uart_puts_P
*/
extern void uart_puts_p(const char *s );
/**
* @brief Macro to automatically put a string constant into program memory
*/
#define uart_puts_P(__s) uart_puts_p(P(__s))
/**
* @brief Put integer to ringbuffer for transmitting via UART.
*
* The integer is converted to a string which is buffered by the uart
* library in a circular buffer and one character at a time is transmitted
* to the UART using interrupts.
*
* @param value to transfer
* @return none
* @see uart_puts_p
*/
extern void uart_puti( int i );
/**
* @brief Put nibble as hex to ringbuffer for transmit via UART.
*
* The lower nibble of the parameter is convertet to correspondig
* hex-char and put in a circular buffer and one character at a time
* is transmitted to the UART using interrupts.
*
* @param value to transfer (byte, only lower nibble converted)
* @return none
* @see uart_putc
*/
extern void uart_puthex_nibble(const unsigned char b);
/**
* @brief Put byte as hex to ringbuffer for transmit via UART.
*
* The upper and lower nibble of the parameter are convertet to
* correspondig hex-chars and put in a circular buffer and one
* character at a time is transmitted to the UART using interrupts.
*
* @param value to transfer
* @return none
* @see uart_puthex_nibble
*/
extern void uart_puthex_byte(const unsigned char b);
/**
* @brief Put byte as bin to ringbuffer for transmit via UART.
*
* @param value to transfer
* @return none
* @see uart_putc
*/
extern void uart_putbin_byte(const unsigned char b);
/*@}*/
#endif // UART_H