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