777 lines
26 KiB
C
777 lines
26 KiB
C
/*************************************************************************
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Title: Interrupt UART library with receive/transmit circular buffers
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Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury
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File: $Id: uart.c,v 1.6.2.1 2007/07/01 11:14:38 peter Exp $
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Software: AVR-GCC 4.1, AVR Libc 1.4.6 or higher
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Hardware: any AVR with built-in UART,
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License: GNU General Public License
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DESCRIPTION:
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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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The UART_RX_BUFFER_SIZE and UART_TX_BUFFER_SIZE variables define
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the buffer size in bytes. Note that these variables must be a
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power of 2.
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USAGE:
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Refere to the header file uart.h for a description of the routines.
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See also example test_uart.c.
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NOTES:
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Based on Atmel Application Note AVR306
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LICENSE:
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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.cpp - 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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Modified 23 November 2006 by David A. Mellis
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************************************************************************/
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/************************************************************************
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Changelog for modifications made by Tim Sharpe, starting with the current
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library version on his Web site as of 05/01/2009.
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Date Description
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=========================================================================
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05/11/2009 Changed all existing UARTx_RECEIVE_INTERRUPT and UARTx_TRANSMIT_INTERRUPT
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macros to use the "_vect" format introduced in AVR-Libc
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v1.4.0. Had to split the 3290 and 6490 out of their existing
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macro due to an inconsistency in the UART0_RECEIVE_INTERRUPT
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vector name (seems like a typo: USART_RX_vect for the 3290/6490
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vice USART0_RX_vect for the others in the macro).
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Verified all existing macro register names against the device
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header files in AVR-Libc v1.6.6 to catch any inconsistencies.
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05/12/2009 Added support for 48P, 88P, 168P, and 328P by adding them to the
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existing 48/88/168 macro.
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Added Arduino-style available() and flush() functions for both
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supported UARTs. Really wanted to keep them out of the library, so
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that it would be as close as possible to Peter Fleury's original
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library, but has scoping issues accessing internal variables from
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another program. Go C!
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05/13/2009 Changed Interrupt Service Routine label from the old "SIGNAL" to
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the "ISR" format introduced in AVR-Libc v1.4.0.
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************************************************************************/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include "uart.h"
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/*
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* constants and macros
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*/
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/* size of RX/TX buffers */
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#define UART_RX_BUFFER_MASK ( UART_RX_BUFFER_SIZE - 1)
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#define UART_TX_BUFFER_MASK ( UART_TX_BUFFER_SIZE - 1)
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#if ( UART_RX_BUFFER_SIZE & UART_RX_BUFFER_MASK )
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#error RX buffer size is not a power of 2
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#endif
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#if ( UART_TX_BUFFER_SIZE & UART_TX_BUFFER_MASK )
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#error TX buffer size is not a power of 2
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#endif
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#if defined(__AVR_AT90S2313__) \
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|| defined(__AVR_AT90S4414__) || defined(__AVR_AT90S4434__) \
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|| defined(__AVR_AT90S8515__) || defined(__AVR_AT90S8535__) \
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|| defined(__AVR_ATmega103__)
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/* old AVR classic or ATmega103 with one UART */
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#define AT90_UART
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#define UART0_RECEIVE_INTERRUPT UART_RX_vect
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#define UART0_TRANSMIT_INTERRUPT UART_UDRE_vect
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#define UART0_STATUS USR
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#define UART0_CONTROL UCR
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#define UART0_DATA UDR
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#define UART0_UDRIE UDRIE
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#elif defined(__AVR_AT90S2333__) || defined(__AVR_AT90S4433__)
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/* old AVR classic with one UART */
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#define AT90_UART
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#define UART0_RECEIVE_INTERRUPT UART_RX_vect
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#define UART0_TRANSMIT_INTERRUPT UART_UDRE_vect
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#define UART0_STATUS UCSRA
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#define UART0_CONTROL UCSRB
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#define UART0_DATA UDR
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#define UART0_UDRIE UDRIE
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#elif defined(__AVR_ATmega8__) || defined(__AVR_ATmega16__) || defined(__AVR_ATmega32__) \
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|| defined(__AVR_ATmega323__)
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/* ATmega with one USART */
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#define ATMEGA_USART
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#define UART0_RECEIVE_INTERRUPT USART_RXC_vect
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#define UART0_TRANSMIT_INTERRUPT USART_UDRE_vect
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#define UART0_STATUS UCSRA
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#define UART0_CONTROL UCSRB
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#define UART0_DATA UDR
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#define UART0_UDRIE UDRIE
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#elif defined(__AVR_ATmega8515__) || defined(__AVR_ATmega8535__)
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/* ATmega with one USART */
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#define ATMEGA_USART
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#define UART0_RECEIVE_INTERRUPT USART_RX_vect
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#define UART0_TRANSMIT_INTERRUPT USART_UDRE_vect
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#define UART0_STATUS UCSRA
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#define UART0_CONTROL UCSRB
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#define UART0_DATA UDR
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#define UART0_UDRIE UDRIE
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#elif defined(__AVR_ATmega163__)
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/* ATmega163 with one UART */
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#define ATMEGA_UART
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#define UART0_RECEIVE_INTERRUPT UART_RX_vect
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#define UART0_TRANSMIT_INTERRUPT UART_UDRE_vect
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#define UART0_STATUS UCSRA
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#define UART0_CONTROL UCSRB
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#define UART0_DATA UDR
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#define UART0_UDRIE UDRIE
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#elif defined(__AVR_ATmega162__)
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/* ATmega with two USART */
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#define ATMEGA_USART0
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#define ATMEGA_USART1
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#define UART0_RECEIVE_INTERRUPT USART0_RXC_vect
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#define UART1_RECEIVE_INTERRUPT USART1_RXC_vect
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#define UART0_TRANSMIT_INTERRUPT USART0_UDRE_vect
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#define UART1_TRANSMIT_INTERRUPT USART1_UDRE_vect
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#define UART0_STATUS UCSR0A
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#define UART0_CONTROL UCSR0B
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#define UART0_DATA UDR0
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#define UART0_UDRIE UDRIE0
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#define UART1_STATUS UCSR1A
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#define UART1_CONTROL UCSR1B
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#define UART1_DATA UDR1
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#define UART1_UDRIE UDRIE1
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#elif defined(__AVR_ATmega64__) || defined(__AVR_ATmega128__)
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/* ATmega with two USART */
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#define ATMEGA_USART0
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#define ATMEGA_USART1
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#define UART0_RECEIVE_INTERRUPT USART0_RX_vect
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#define UART1_RECEIVE_INTERRUPT USART1_RX_vect
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#define UART0_TRANSMIT_INTERRUPT USART0_UDRE_vect
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#define UART1_TRANSMIT_INTERRUPT USART1_UDRE_vect
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#define UART0_STATUS UCSR0A
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#define UART0_CONTROL UCSR0B
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#define UART0_DATA UDR0
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#define UART0_UDRIE UDRIE0
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#define UART1_STATUS UCSR1A
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#define UART1_CONTROL UCSR1B
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#define UART1_DATA UDR1
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#define UART1_UDRIE UDRIE1
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#elif defined(__AVR_ATmega161__)
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/* ATmega with UART */
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#error "AVR ATmega161 currently not supported by this libaray !"
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#elif defined(__AVR_ATmega169__)
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/* ATmega with one USART */
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#define ATMEGA_USART
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#define UART0_RECEIVE_INTERRUPT USART0_RX_vect
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#define UART0_TRANSMIT_INTERRUPT USART0_UDRE_vect
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#define UART0_STATUS UCSRA
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#define UART0_CONTROL UCSRB
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#define UART0_DATA UDR
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#define UART0_UDRIE UDRIE
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#elif defined(__AVR_ATmega48__) ||defined(__AVR_ATmega88__) || defined(__AVR_ATmega168__) || \
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defined(__AVR_ATmega48P__) ||defined(__AVR_ATmega88P__) || defined(__AVR_ATmega168P__) || \
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defined(__AVR_ATmega328P__)
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/* TLS-Added 48P/88P/168P/328P */
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/* ATmega with one USART */
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#define ATMEGA_USART0
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#define UART0_RECEIVE_INTERRUPT USART_RX_vect
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#define UART0_TRANSMIT_INTERRUPT USART_UDRE_vect
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#define UART0_STATUS UCSR0A
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#define UART0_CONTROL UCSR0B
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#define UART0_DATA UDR0
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#define UART0_UDRIE UDRIE0
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#elif defined(__AVR_ATtiny2313__)
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#define ATMEGA_USART
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#define UART0_RECEIVE_INTERRUPT USART_RX_vect
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#define UART0_TRANSMIT_INTERRUPT USART_UDRE_vect
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#define UART0_STATUS UCSRA
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#define UART0_CONTROL UCSRB
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#define UART0_DATA UDR
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#define UART0_UDRIE UDRIE
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#elif defined(__AVR_ATmega329__) ||\
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defined(__AVR_ATmega649__) ||\
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defined(__AVR_ATmega325__) ||defined(__AVR_ATmega3250__) ||\
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defined(__AVR_ATmega645__) ||defined(__AVR_ATmega6450__)
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/* ATmega with one USART */
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#define ATMEGA_USART0
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#define UART0_RECEIVE_INTERRUPT USART0_RX_vect
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#define UART0_TRANSMIT_INTERRUPT USART0_UDRE_vect
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#define UART0_STATUS UCSR0A
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#define UART0_CONTROL UCSR0B
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#define UART0_DATA UDR0
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#define UART0_UDRIE UDRIE0
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#elif defined(__AVR_ATmega3290__) ||\
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defined(__AVR_ATmega6490__)
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/* TLS-Separated these two from the previous group because of inconsistency in the USART_RX */
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/* ATmega with one USART */
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#define ATMEGA_USART0
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#define UART0_RECEIVE_INTERRUPT USART_RX_vect
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#define UART0_TRANSMIT_INTERRUPT USART0_UDRE_vect
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#define UART0_STATUS UCSR0A
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#define UART0_CONTROL UCSR0B
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#define UART0_DATA UDR0
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#define UART0_UDRIE UDRIE0
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#elif defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega640__)
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/* ATmega with two USART */
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#define ATMEGA_USART0
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#define ATMEGA_USART1
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#define UART0_RECEIVE_INTERRUPT USART0_RX_vect
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#define UART1_RECEIVE_INTERRUPT USART0_UDRE_vect
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#define UART0_TRANSMIT_INTERRUPT USART1_RX_vect
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#define UART1_TRANSMIT_INTERRUPT USART1_UDRE_vect
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#define UART0_STATUS UCSR0A
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#define UART0_CONTROL UCSR0B
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#define UART0_DATA UDR0
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#define UART0_UDRIE UDRIE0
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#define UART1_STATUS UCSR1A
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#define UART1_CONTROL UCSR1B
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#define UART1_DATA UDR1
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#define UART1_UDRIE UDRIE1
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#elif defined(__AVR_ATmega644__)
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/* ATmega with one USART */
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#define ATMEGA_USART0
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#define UART0_RECEIVE_INTERRUPT USART0_RX_vect
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#define UART0_TRANSMIT_INTERRUPT USART0_UDRE_vect
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#define UART0_STATUS UCSR0A
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#define UART0_CONTROL UCSR0B
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#define UART0_DATA UDR0
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#define UART0_UDRIE UDRIE0
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#elif defined(__AVR_ATmega164P__) || defined(__AVR_ATmega324P__) || defined(__AVR_ATmega644P__)
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/* ATmega with two USART */
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#define ATMEGA_USART0
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#define ATMEGA_USART1
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#define UART0_RECEIVE_INTERRUPT USART0_RX_vect
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#define UART1_RECEIVE_INTERRUPT USART0_UDRE_vect
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#define UART0_TRANSMIT_INTERRUPT USART1_RX_vect
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#define UART1_TRANSMIT_INTERRUPT USART1_UDRE_vect
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#define UART0_STATUS UCSR0A
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#define UART0_CONTROL UCSR0B
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#define UART0_DATA UDR0
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#define UART0_UDRIE UDRIE0
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#define UART1_STATUS UCSR1A
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#define UART1_CONTROL UCSR1B
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#define UART1_DATA UDR1
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#define UART1_UDRIE UDRIE1
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#else
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#error "no UART definition for MCU available"
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#endif
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/*
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* module global variables
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*/
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static volatile unsigned char UART_TxBuf[UART_TX_BUFFER_SIZE];
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static volatile unsigned char UART_RxBuf[UART_RX_BUFFER_SIZE];
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static volatile unsigned char UART_TxHead;
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static volatile unsigned char UART_TxTail;
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static volatile unsigned char UART_RxHead;
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static volatile unsigned char UART_RxTail;
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static volatile unsigned char UART_LastRxError;
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#if defined( ATMEGA_USART1 )
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static volatile unsigned char UART1_TxBuf[UART_TX_BUFFER_SIZE];
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static volatile unsigned char UART1_RxBuf[UART_RX_BUFFER_SIZE];
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static volatile unsigned char UART1_TxHead;
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static volatile unsigned char UART1_TxTail;
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static volatile unsigned char UART1_RxHead;
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static volatile unsigned char UART1_RxTail;
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static volatile unsigned char UART1_LastRxError;
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#endif
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ISR(UART0_RECEIVE_INTERRUPT)
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/*************************************************************************
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Function: UART Receive Complete interrupt
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Purpose: called when the UART has received a character
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**************************************************************************/
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{
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unsigned char tmphead;
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unsigned char data;
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unsigned char usr;
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unsigned char lastRxError;
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/* read UART status register and UART data register */
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usr = UART0_STATUS;
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data = UART0_DATA;
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/* */
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#if defined( AT90_UART )
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lastRxError = (usr & (_BV(FE)|_BV(DOR)) );
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#elif defined( ATMEGA_USART )
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lastRxError = (usr & (_BV(FE)|_BV(DOR)) );
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#elif defined( ATMEGA_USART0 )
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lastRxError = (usr & (_BV(FE0)|_BV(DOR0)) );
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#elif defined ( ATMEGA_UART )
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lastRxError = (usr & (_BV(FE)|_BV(DOR)) );
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#endif
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/* calculate buffer index */
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tmphead = ( UART_RxHead + 1) & UART_RX_BUFFER_MASK;
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if ( tmphead == UART_RxTail ) {
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/* error: receive buffer overflow */
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lastRxError = UART_BUFFER_OVERFLOW >> 8;
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}else{
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/* store new index */
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UART_RxHead = tmphead;
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/* store received data in buffer */
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UART_RxBuf[tmphead] = data;
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}
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UART_LastRxError = lastRxError;
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}
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ISR(UART0_TRANSMIT_INTERRUPT)
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/*************************************************************************
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Function: UART Data Register Empty interrupt
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Purpose: called when the UART is ready to transmit the next byte
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**************************************************************************/
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{
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unsigned char tmptail;
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if ( UART_TxHead != UART_TxTail) {
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/* calculate and store new buffer index */
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tmptail = (UART_TxTail + 1) & UART_TX_BUFFER_MASK;
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UART_TxTail = tmptail;
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/* get one byte from buffer and write it to UART */
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UART0_DATA = UART_TxBuf[tmptail]; /* start transmission */
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}else{
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/* tx buffer empty, disable UDRE interrupt */
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UART0_CONTROL &= ~_BV(UART0_UDRIE);
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}
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}
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/*************************************************************************
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Function: uart_init()
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Purpose: initialize UART and set baudrate
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Input: baudrate using macro UART_BAUD_SELECT()
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Returns: none
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**************************************************************************/
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void uart_init(unsigned int baudrate)
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{
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UART_TxHead = 0;
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UART_TxTail = 0;
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UART_RxHead = 0;
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UART_RxTail = 0;
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#if defined( AT90_UART )
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/* set baud rate */
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UBRR = (unsigned char)baudrate;
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/* enable UART receiver and transmmitter and receive complete interrupt */
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UART0_CONTROL = _BV(RXCIE)|_BV(RXEN)|_BV(TXEN);
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#elif defined (ATMEGA_USART)
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/* Set baud rate */
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if ( baudrate & 0x8000 )
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{
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UART0_STATUS = (1<<U2X); //Enable 2x speed
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baudrate &= ~0x8000;
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}
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UBRRH = (unsigned char)(baudrate>>8);
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UBRRL = (unsigned char) baudrate;
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/* Enable USART receiver and transmitter and receive complete interrupt */
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UART0_CONTROL = _BV(RXCIE)|(1<<RXEN)|(1<<TXEN);
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/* Set frame format: asynchronous, 8data, no parity, 1stop bit */
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#ifdef URSEL
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UCSRC = (1<<URSEL)|(3<<UCSZ0);
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#else
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UCSRC = (3<<UCSZ0);
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#endif
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#elif defined (ATMEGA_USART0 )
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/* Set baud rate */
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if ( baudrate & 0x8000 )
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{
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UART0_STATUS = (1<<U2X0); //Enable 2x speed
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baudrate &= ~0x8000;
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}
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UBRR0H = (unsigned char)(baudrate>>8);
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UBRR0L = (unsigned char) baudrate;
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/* Enable USART receiver and transmitter and receive complete interrupt */
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UART0_CONTROL = _BV(RXCIE0)|(1<<RXEN0)|(1<<TXEN0);
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/* Set frame format: asynchronous, 8data, no parity, 1stop bit */
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#ifdef URSEL0
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UCSR0C = (1<<URSEL0)|(3<<UCSZ00);
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#else
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UCSR0C = (3<<UCSZ00);
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#endif
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#elif defined ( ATMEGA_UART )
|
|
/* set baud rate */
|
|
if ( baudrate & 0x8000 )
|
|
{
|
|
UART0_STATUS = (1<<U2X); //Enable 2x speed
|
|
baudrate &= ~0x8000;
|
|
}
|
|
UBRRHI = (unsigned char)(baudrate>>8);
|
|
UBRR = (unsigned char) baudrate;
|
|
|
|
/* Enable UART receiver and transmitter and receive complete interrupt */
|
|
UART0_CONTROL = _BV(RXCIE)|(1<<RXEN)|(1<<TXEN);
|
|
|
|
#endif
|
|
|
|
}/* uart_init */
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart_getc()
|
|
Purpose: return byte from ringbuffer
|
|
Returns: lower byte: received byte from ringbuffer
|
|
higher byte: last receive error
|
|
**************************************************************************/
|
|
unsigned int uart_getc(void)
|
|
{
|
|
unsigned char tmptail;
|
|
unsigned char data;
|
|
|
|
|
|
if ( UART_RxHead == UART_RxTail ) {
|
|
return UART_NO_DATA; /* no data available */
|
|
}
|
|
|
|
/* calculate /store buffer index */
|
|
tmptail = (UART_RxTail + 1) & UART_RX_BUFFER_MASK;
|
|
UART_RxTail = tmptail;
|
|
|
|
/* get data from receive buffer */
|
|
data = UART_RxBuf[tmptail];
|
|
|
|
return (UART_LastRxError << 8) + data;
|
|
|
|
}/* uart_getc */
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart_putc()
|
|
Purpose: write byte to ringbuffer for transmitting via UART
|
|
Input: byte to be transmitted
|
|
Returns: none
|
|
**************************************************************************/
|
|
void uart_putc(unsigned char data)
|
|
{
|
|
unsigned char tmphead;
|
|
|
|
|
|
tmphead = (UART_TxHead + 1) & UART_TX_BUFFER_MASK;
|
|
|
|
while ( tmphead == UART_TxTail ){
|
|
;/* wait for free space in buffer */
|
|
}
|
|
|
|
UART_TxBuf[tmphead] = data;
|
|
UART_TxHead = tmphead;
|
|
|
|
/* enable UDRE interrupt */
|
|
UART0_CONTROL |= _BV(UART0_UDRIE);
|
|
|
|
}/* uart_putc */
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart_puts()
|
|
Purpose: transmit string to UART
|
|
Input: string to be transmitted
|
|
Returns: none
|
|
**************************************************************************/
|
|
void uart_puts(const char *s )
|
|
{
|
|
while (*s)
|
|
uart_putc(*s++);
|
|
|
|
}/* uart_puts */
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart_puts_p()
|
|
Purpose: transmit string from program memory to UART
|
|
Input: program memory string to be transmitted
|
|
Returns: none
|
|
**************************************************************************/
|
|
void uart_puts_p(const char *progmem_s )
|
|
{
|
|
register char c;
|
|
|
|
while ( (c = pgm_read_byte(progmem_s++)) )
|
|
uart_putc(c);
|
|
|
|
}/* uart_puts_p */
|
|
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart_available()
|
|
Purpose: Determine the number of bytes waiting in the receive buffer
|
|
Input: None
|
|
Returns: Integer number of bytes in the receive buffer
|
|
**************************************************************************/
|
|
int uart_available(void)
|
|
{
|
|
return (UART_RX_BUFFER_MASK + UART_RxHead - UART_RxTail) % UART_RX_BUFFER_MASK;
|
|
}/* uart_available */
|
|
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart_flush()
|
|
Purpose: Flush bytes waiting the receive buffer. Acutally ignores them.
|
|
Input: None
|
|
Returns: None
|
|
**************************************************************************/
|
|
void uart_flush(void)
|
|
{
|
|
UART_RxHead = UART_RxTail;
|
|
}/* uart_flush */
|
|
|
|
|
|
/*
|
|
* these functions are only for ATmegas with two USART
|
|
*/
|
|
#if defined( ATMEGA_USART1 )
|
|
|
|
SIGNAL(UART1_RECEIVE_INTERRUPT)
|
|
/*************************************************************************
|
|
Function: UART1 Receive Complete interrupt
|
|
Purpose: called when the UART1 has received a character
|
|
**************************************************************************/
|
|
{
|
|
unsigned char tmphead;
|
|
unsigned char data;
|
|
unsigned char usr;
|
|
unsigned char lastRxError;
|
|
|
|
|
|
/* read UART status register and UART data register */
|
|
usr = UART1_STATUS;
|
|
data = UART1_DATA;
|
|
|
|
/* */
|
|
lastRxError = (usr & (_BV(FE1)|_BV(DOR1)) );
|
|
|
|
/* calculate buffer index */
|
|
tmphead = ( UART1_RxHead + 1) & UART_RX_BUFFER_MASK;
|
|
|
|
if ( tmphead == UART1_RxTail ) {
|
|
/* error: receive buffer overflow */
|
|
lastRxError = UART_BUFFER_OVERFLOW >> 8;
|
|
}else{
|
|
/* store new index */
|
|
UART1_RxHead = tmphead;
|
|
/* store received data in buffer */
|
|
UART1_RxBuf[tmphead] = data;
|
|
}
|
|
UART1_LastRxError = lastRxError;
|
|
}
|
|
|
|
|
|
SIGNAL(UART1_TRANSMIT_INTERRUPT)
|
|
/*************************************************************************
|
|
Function: UART1 Data Register Empty interrupt
|
|
Purpose: called when the UART1 is ready to transmit the next byte
|
|
**************************************************************************/
|
|
{
|
|
unsigned char tmptail;
|
|
|
|
|
|
if ( UART1_TxHead != UART1_TxTail) {
|
|
/* calculate and store new buffer index */
|
|
tmptail = (UART1_TxTail + 1) & UART_TX_BUFFER_MASK;
|
|
UART1_TxTail = tmptail;
|
|
/* get one byte from buffer and write it to UART */
|
|
UART1_DATA = UART1_TxBuf[tmptail]; /* start transmission */
|
|
}else{
|
|
/* tx buffer empty, disable UDRE interrupt */
|
|
UART1_CONTROL &= ~_BV(UART1_UDRIE);
|
|
}
|
|
}
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart1_init()
|
|
Purpose: initialize UART1 and set baudrate
|
|
Input: baudrate using macro UART_BAUD_SELECT()
|
|
Returns: none
|
|
**************************************************************************/
|
|
void uart1_init(unsigned int baudrate)
|
|
{
|
|
UART1_TxHead = 0;
|
|
UART1_TxTail = 0;
|
|
UART1_RxHead = 0;
|
|
UART1_RxTail = 0;
|
|
|
|
|
|
/* Set baud rate */
|
|
if ( baudrate & 0x8000 )
|
|
{
|
|
UART1_STATUS = (1<<U2X1); //Enable 2x speed
|
|
baudrate &= ~0x8000;
|
|
}
|
|
UBRR1H = (unsigned char)(baudrate>>8);
|
|
UBRR1L = (unsigned char) baudrate;
|
|
|
|
/* Enable USART receiver and transmitter and receive complete interrupt */
|
|
UART1_CONTROL = _BV(RXCIE1)|(1<<RXEN1)|(1<<TXEN1);
|
|
|
|
/* Set frame format: asynchronous, 8data, no parity, 1stop bit */
|
|
#ifdef URSEL1
|
|
UCSR1C = (1<<URSEL1)|(3<<UCSZ10);
|
|
#else
|
|
UCSR1C = (3<<UCSZ10);
|
|
#endif
|
|
}/* uart_init */
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart1_getc()
|
|
Purpose: return byte from ringbuffer
|
|
Returns: lower byte: received byte from ringbuffer
|
|
higher byte: last receive error
|
|
**************************************************************************/
|
|
unsigned int uart1_getc(void)
|
|
{
|
|
unsigned char tmptail;
|
|
unsigned char data;
|
|
|
|
|
|
if ( UART1_RxHead == UART1_RxTail ) {
|
|
return UART_NO_DATA; /* no data available */
|
|
}
|
|
|
|
/* calculate /store buffer index */
|
|
tmptail = (UART1_RxTail + 1) & UART_RX_BUFFER_MASK;
|
|
UART1_RxTail = tmptail;
|
|
|
|
/* get data from receive buffer */
|
|
data = UART1_RxBuf[tmptail];
|
|
|
|
return (UART1_LastRxError << 8) + data;
|
|
|
|
}/* uart1_getc */
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart1_putc()
|
|
Purpose: write byte to ringbuffer for transmitting via UART
|
|
Input: byte to be transmitted
|
|
Returns: none
|
|
**************************************************************************/
|
|
void uart1_putc(unsigned char data)
|
|
{
|
|
unsigned char tmphead;
|
|
|
|
|
|
tmphead = (UART1_TxHead + 1) & UART_TX_BUFFER_MASK;
|
|
|
|
while ( tmphead == UART1_TxTail ){
|
|
;/* wait for free space in buffer */
|
|
}
|
|
|
|
UART1_TxBuf[tmphead] = data;
|
|
UART1_TxHead = tmphead;
|
|
|
|
/* enable UDRE interrupt */
|
|
UART1_CONTROL |= _BV(UART1_UDRIE);
|
|
|
|
}/* uart1_putc */
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart1_puts()
|
|
Purpose: transmit string to UART1
|
|
Input: string to be transmitted
|
|
Returns: none
|
|
**************************************************************************/
|
|
void uart1_puts(const char *s )
|
|
{
|
|
while (*s)
|
|
uart1_putc(*s++);
|
|
|
|
}/* uart1_puts */
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart1_puts_p()
|
|
Purpose: transmit string from program memory to UART1
|
|
Input: program memory string to be transmitted
|
|
Returns: none
|
|
**************************************************************************/
|
|
void uart1_puts_p(const char *progmem_s )
|
|
{
|
|
register char c;
|
|
|
|
while ( (c = pgm_read_byte(progmem_s++)) )
|
|
uart1_putc(c);
|
|
|
|
}/* uart1_puts_p */
|
|
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart1_available()
|
|
Purpose: Determine the number of bytes waiting in the receive buffer
|
|
Input: None
|
|
Returns: Integer number of bytes in the receive buffer
|
|
**************************************************************************/
|
|
int uart1_available(void)
|
|
{
|
|
return (UART_RX_BUFFER_MASK + UART1_RxHead - UART1_RxTail) % UART_RX_BUFFER_MASK;
|
|
}/* uart1_available */
|
|
|
|
|
|
|
|
/*************************************************************************
|
|
Function: uart1_flush()
|
|
Purpose: Flush bytes waiting the receive buffer. Acutally ignores them.
|
|
Input: None
|
|
Returns: None
|
|
**************************************************************************/
|
|
void uart1_flush(void)
|
|
{
|
|
UART1_RxHead = UART1_RxTail;
|
|
}/* uart1_flush */
|
|
|
|
#endif
|