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/************************************************************************ |
Title: Interrupt UART library with receive/transmit circular buffers |
Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury |
File: $Id: uart.h,v 1.8.2.1 2007/07/01 11:14:38 peter Exp $ |
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 Doxygen manual |
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LICENSE: |
Copyright (C) 2006 Peter Fleury |
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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. |
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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. |
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************************************************************************/ |
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// |
// @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 constants to your target and your application by adding |
// CDEFS += -DUART_RX_BUFFER_SIZE=nn -DUART_RX_BUFFER_SIZE=nn to your Makefile. |
// |
// @note Based on Atmel Application Note AVR306 |
// @author Peter Fleury pfleury@gmx.ch http://jump.to/fleury |
// |
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#ifndef UART_H |
#define UART_H |
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#if (__GNUC__ * 100 + __GNUC_MINOR__) < 304 |
#error "This library requires AVR-GCC 3.4 or later, update to newer AVR-GCC compiler !" |
#endif |
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// constants and macros |
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// @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)/((baudRate)*16l)-1) |
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// @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)/((baudRate)*8l)-1)|0x8000) |
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// Size of the circular receive buffer, must be power of 2 |
#ifndef UART_RX_BUFFER_SIZE |
#define UART_RX_BUFFER_SIZE 32 |
#endif |
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// Size of the circular transmit buffer, must be power of 2 |
#ifndef UART_TX_BUFFER_SIZE |
#define UART_TX_BUFFER_SIZE 32 |
#endif |
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// test if the size of the circular buffers fits into SRAM |
#if ( (UART_RX_BUFFER_SIZE+UART_TX_BUFFER_SIZE) >= (RAMEND-0x60 ) ) |
#error "size of UART_RX_BUFFER_SIZE + UART_TX_BUFFER_SIZE larger than size of SRAM" |
#endif |
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// high byte error return code of uart_getc() |
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#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 |
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// |
// function prototypes |
// |
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// |
// @brief Initialize UART and set baudrate |
// @param baudrate Specify baudrate using macro UART_BAUD_SELECT() |
// @return none |
// |
extern void uart_init(unsigned int baudrate); |
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// |
// @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); |
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// |
// @brief Put byte to ringbuffer for transmitting via UART |
// @param data byte to be transmitted |
// @return none |
// |
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// @brief Initialize USART1 (only available on selected ATmegas) @see uart_init |
extern void uart1_init(unsigned int baudrate); |
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// @brief Get received byte of USART1 from ringbuffer. (only available on selected ATmega) @see uart_getc |
extern unsigned int uart1_getc(void); |
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// @brief Put byte to ringbuffer for transmitting via USART1 (only available on selected ATmega) @see uart_putc |
//extern void uart1_putc(unsigned char data); |
extern int uart1_putc(unsigned char data); |
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// @brief Put string to ringbuffer for transmitting via USART1 (only available on selected ATmega) @see uart_puts |
extern void uart1_puts(const char *s ); |
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// @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 ); |
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// @brief Macro to automatically put a string constant into program memory |
#define uart1_puts_P(__s) uart1_puts_p(PSTR(__s)) |
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extern char *utoa1(char* buffer, const unsigned int size, unsigned int value); |
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#endif // UART_H |
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