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1523 lines
44 KiB
C
1523 lines
44 KiB
C
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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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Updated UART library (this one) by Andy Gock
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https://github.com/andygock/avr-uart
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Based on updated UART library (this one) by Tim Sharpe
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http://beaststwo.org/avr-uart/index.shtml
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Based on original library by Peter Fluery
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http://homepage.hispeed.ch/peterfleury/avr-software.html
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*************************************************************************/
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/*************************************************************************
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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.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 <util/atomic.h>
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#include "usart.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_RX0_BUFFER_MASK (UART_RX0_BUFFER_SIZE - 1)
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#define UART_RX1_BUFFER_MASK (UART_RX1_BUFFER_SIZE - 1)
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#define UART_RX2_BUFFER_MASK (UART_RX2_BUFFER_SIZE - 1)
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#define UART_RX3_BUFFER_MASK (UART_RX3_BUFFER_SIZE - 1)
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#define UART_TX0_BUFFER_MASK (UART_TX0_BUFFER_SIZE - 1)
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#define UART_TX1_BUFFER_MASK (UART_TX1_BUFFER_SIZE - 1)
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#define UART_TX2_BUFFER_MASK (UART_TX2_BUFFER_SIZE - 1)
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#define UART_TX3_BUFFER_MASK (UART_TX3_BUFFER_SIZE - 1)
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#if (UART_RX0_BUFFER_SIZE & UART_RX0_BUFFER_MASK)
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#error RX0 buffer size is not a power of 2
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#endif
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#if (UART_TX0_BUFFER_SIZE & UART_TX0_BUFFER_MASK)
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#error TX0 buffer size is not a power of 2
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#endif
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#if (UART_RX1_BUFFER_SIZE & UART_RX1_BUFFER_MASK)
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#error RX1 buffer size is not a power of 2
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#endif
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#if (UART_TX1_BUFFER_SIZE & UART_TX1_BUFFER_MASK)
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#error TX1 buffer size is not a power of 2
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#endif
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#if (UART_RX2_BUFFER_SIZE & UART_RX2_BUFFER_MASK)
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#error RX2 buffer size is not a power of 2
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#endif
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#if (UART_TX2_BUFFER_SIZE & UART_TX2_BUFFER_MASK)
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#error TX2 buffer size is not a power of 2
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#endif
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#if (UART_RX3_BUFFER_SIZE & UART_RX3_BUFFER_MASK)
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#error RX3 buffer size is not a power of 2
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#endif
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#if (UART_TX3_BUFFER_SIZE & UART_TX3_BUFFER_MASK)
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#error TX3 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_ATmega8U2__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega16U4__) || \
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defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega32U6__)
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/* ATmega with one USART, but is called USART1 (untested) */
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#define ATMEGA_USART1
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#define UART1_RECEIVE_INTERRUPT USART1_RX_vect
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#define UART1_TRANSMIT_INTERRUPT USART1_UDRE_vect
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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_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__) || defined(__AVR_ATtiny2313A__) || defined(__AVR_ATtiny4313__)
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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 four USART */
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#define ATMEGA_USART0
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#define ATMEGA_USART1
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#define ATMEGA_USART2
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#define ATMEGA_USART3
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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 UART2_RECEIVE_INTERRUPT USART2_RX_vect
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#define UART3_RECEIVE_INTERRUPT USART3_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 UART2_TRANSMIT_INTERRUPT USART2_UDRE_vect
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#define UART3_TRANSMIT_INTERRUPT USART3_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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|
|
#define UART2_STATUS UCSR2A
|
||
|
|
#define UART2_CONTROL UCSR2B
|
||
|
|
#define UART2_DATA UDR2
|
||
|
|
#define UART2_UDRIE UDRIE2
|
||
|
|
#define UART3_STATUS UCSR3A
|
||
|
|
#define UART3_CONTROL UCSR3B
|
||
|
|
#define UART3_DATA UDR3
|
||
|
|
#define UART3_UDRIE UDRIE3
|
||
|
|
#elif defined(__AVR_ATmega644__)
|
||
|
|
/* ATmega with one USART */
|
||
|
|
#define ATMEGA_USART0
|
||
|
|
#define UART0_RECEIVE_INTERRUPT USART0_RX_vect
|
||
|
|
#define UART0_TRANSMIT_INTERRUPT USART0_UDRE_vect
|
||
|
|
#define UART0_STATUS UCSR0A
|
||
|
|
#define UART0_CONTROL UCSR0B
|
||
|
|
#define UART0_DATA UDR0
|
||
|
|
#define UART0_UDRIE UDRIE0
|
||
|
|
#elif defined(__AVR_ATmega164P__) || defined(__AVR_ATmega324P__) || defined(__AVR_ATmega644P__) || \
|
||
|
|
defined(__AVR_ATmega1284P__)
|
||
|
|
/* ATmega with two USART */
|
||
|
|
#define ATMEGA_USART0
|
||
|
|
#define ATMEGA_USART1
|
||
|
|
#define UART0_RECEIVE_INTERRUPT USART0_RX_vect
|
||
|
|
#define UART1_RECEIVE_INTERRUPT USART1_RX_vect
|
||
|
|
#define UART0_TRANSMIT_INTERRUPT USART0_UDRE_vect
|
||
|
|
#define UART1_TRANSMIT_INTERRUPT USART1_UDRE_vect
|
||
|
|
#define UART0_STATUS UCSR0A
|
||
|
|
#define UART0_CONTROL UCSR0B
|
||
|
|
#define UART0_DATA UDR0
|
||
|
|
#define UART0_UDRIE UDRIE0
|
||
|
|
#define UART1_STATUS UCSR1A
|
||
|
|
#define UART1_CONTROL UCSR1B
|
||
|
|
#define UART1_DATA UDR1
|
||
|
|
#define UART1_UDRIE UDRIE1
|
||
|
|
#else
|
||
|
|
#error "no UART definition for MCU available"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Module global variables
|
||
|
|
*/
|
||
|
|
|
||
|
|
#if defined(USART0_ENABLED)
|
||
|
|
#if defined(ATMEGA_USART) || defined(ATMEGA_USART0)
|
||
|
|
static volatile uint8_t UART_TxBuf[UART_TX0_BUFFER_SIZE];
|
||
|
|
static volatile uint8_t UART_RxBuf[UART_RX0_BUFFER_SIZE];
|
||
|
|
|
||
|
|
#if defined(USART0_LARGE_BUFFER)
|
||
|
|
static volatile uint16_t UART_TxHead;
|
||
|
|
static volatile uint16_t UART_TxTail;
|
||
|
|
static volatile uint16_t UART_RxHead;
|
||
|
|
static volatile uint16_t UART_RxTail;
|
||
|
|
static volatile uint8_t UART_LastRxError;
|
||
|
|
#else
|
||
|
|
static volatile uint8_t UART_TxHead;
|
||
|
|
static volatile uint8_t UART_TxTail;
|
||
|
|
static volatile uint8_t UART_RxHead;
|
||
|
|
static volatile uint8_t UART_RxTail;
|
||
|
|
static volatile uint8_t UART_LastRxError;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(USART1_ENABLED)
|
||
|
|
#if defined(ATMEGA_USART1)
|
||
|
|
static volatile uint8_t UART1_TxBuf[UART_TX1_BUFFER_SIZE];
|
||
|
|
static volatile uint8_t UART1_RxBuf[UART_RX1_BUFFER_SIZE];
|
||
|
|
|
||
|
|
#if defined(USART1_LARGE_BUFFER)
|
||
|
|
static volatile uint16_t UART1_TxHead;
|
||
|
|
static volatile uint16_t UART1_TxTail;
|
||
|
|
static volatile uint16_t UART1_RxHead;
|
||
|
|
static volatile uint16_t UART1_RxTail;
|
||
|
|
static volatile uint8_t UART1_LastRxError;
|
||
|
|
#else
|
||
|
|
static volatile uint8_t UART1_TxHead;
|
||
|
|
static volatile uint8_t UART1_TxTail;
|
||
|
|
static volatile uint8_t UART1_RxHead;
|
||
|
|
static volatile uint8_t UART1_RxTail;
|
||
|
|
static volatile uint8_t UART1_LastRxError;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(USART2_ENABLED)
|
||
|
|
#if defined(ATMEGA_USART2)
|
||
|
|
static volatile uint8_t UART2_TxBuf[UART_TX2_BUFFER_SIZE];
|
||
|
|
static volatile uint8_t UART2_RxBuf[UART_RX2_BUFFER_SIZE];
|
||
|
|
|
||
|
|
#if defined(USART2_LARGE_BUFFER)
|
||
|
|
static volatile uint16_t UART2_TxHead;
|
||
|
|
static volatile uint16_t UART2_TxTail;
|
||
|
|
static volatile uint16_t UART2_RxHead;
|
||
|
|
static volatile uint16_t UART2_RxTail;
|
||
|
|
static volatile uint8_t UART2_LastRxError;
|
||
|
|
#else
|
||
|
|
static volatile uint8_t UART2_TxHead;
|
||
|
|
static volatile uint8_t UART2_TxTail;
|
||
|
|
static volatile uint8_t UART2_RxHead;
|
||
|
|
static volatile uint8_t UART2_RxTail;
|
||
|
|
static volatile uint8_t UART2_LastRxError;
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(USART3_ENABLED)
|
||
|
|
#if defined(ATMEGA_USART3)
|
||
|
|
static volatile uint8_t UART3_TxBuf[UART_TX3_BUFFER_SIZE];
|
||
|
|
static volatile uint8_t UART3_RxBuf[UART_RX3_BUFFER_SIZE];
|
||
|
|
|
||
|
|
#if defined(USART3_LARGE_BUFFER)
|
||
|
|
static volatile uint16_t UART3_TxHead;
|
||
|
|
static volatile uint16_t UART3_TxTail;
|
||
|
|
static volatile uint16_t UART3_RxHead;
|
||
|
|
static volatile uint16_t UART3_RxTail;
|
||
|
|
static volatile uint8_t UART3_LastRxError;
|
||
|
|
#else
|
||
|
|
static volatile uint8_t UART3_TxHead;
|
||
|
|
static volatile uint8_t UART3_TxTail;
|
||
|
|
static volatile uint8_t UART3_RxHead;
|
||
|
|
static volatile uint8_t UART3_RxTail;
|
||
|
|
static volatile uint8_t UART3_LastRxError;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if defined(USART0_ENABLED)
|
||
|
|
|
||
|
|
#if defined(AT90_UART) || defined(ATMEGA_USART) || defined(ATMEGA_USART0)
|
||
|
|
|
||
|
|
ISR(UART0_RECEIVE_INTERRUPT)
|
||
|
|
/*************************************************************************
|
||
|
|
Function: UART Receive Complete interrupt
|
||
|
|
Purpose: called when the UART has received a character
|
||
|
|
**************************************************************************/
|
||
|
|
{
|
||
|
|
uint16_t tmphead;
|
||
|
|
uint8_t data;
|
||
|
|
uint8_t usr;
|
||
|
|
uint8_t lastRxError;
|
||
|
|
|
||
|
|
/* read UART status register and UART data register */
|
||
|
|
usr = UART0_STATUS;
|
||
|
|
data = UART0_DATA;
|
||
|
|
|
||
|
|
/* */
|
||
|
|
#if defined(AT90_UART)
|
||
|
|
lastRxError = (usr & (_BV(FE)|_BV(DOR)));
|
||
|
|
#elif defined(ATMEGA_USART)
|
||
|
|
lastRxError = (usr & (_BV(FE)|_BV(DOR)));
|
||
|
|
#elif defined(ATMEGA_USART0)
|
||
|
|
lastRxError = (usr & (_BV(FE0)|_BV(DOR0)));
|
||
|
|
#elif defined (ATMEGA_UART)
|
||
|
|
lastRxError = (usr & (_BV(FE)|_BV(DOR)));
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* calculate buffer index */
|
||
|
|
tmphead = (UART_RxHead + 1) & UART_RX0_BUFFER_MASK;
|
||
|
|
|
||
|
|
if (tmphead == UART_RxTail) {
|
||
|
|
/* error: receive buffer overflow */
|
||
|
|
lastRxError = UART_BUFFER_OVERFLOW >> 8;
|
||
|
|
} else {
|
||
|
|
/* store new index */
|
||
|
|
UART_RxHead = tmphead;
|
||
|
|
/* store received data in buffer */
|
||
|
|
UART_RxBuf[tmphead] = data;
|
||
|
|
}
|
||
|
|
UART_LastRxError = lastRxError;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
ISR(UART0_TRANSMIT_INTERRUPT)
|
||
|
|
/*************************************************************************
|
||
|
|
Function: UART Data Register Empty interrupt
|
||
|
|
Purpose: called when the UART is ready to transmit the next byte
|
||
|
|
**************************************************************************/
|
||
|
|
{
|
||
|
|
uint16_t tmptail;
|
||
|
|
|
||
|
|
if (UART_TxHead != UART_TxTail) {
|
||
|
|
/* calculate and store new buffer index */
|
||
|
|
tmptail = (UART_TxTail + 1) & UART_TX0_BUFFER_MASK;
|
||
|
|
UART_TxTail = tmptail;
|
||
|
|
/* get one byte from buffer and write it to UART */
|
||
|
|
UART0_DATA = UART_TxBuf[tmptail]; /* start transmission */
|
||
|
|
} else {
|
||
|
|
/* tx buffer empty, disable UDRE interrupt */
|
||
|
|
UART0_CONTROL &= ~_BV(UART0_UDRIE);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart0_init()
|
||
|
|
Purpose: initialize UART and set baudrate
|
||
|
|
Input: baudrate using macro UART_BAUD_SELECT()
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart0_init(uint16_t baudrate)
|
||
|
|
{
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
UART_TxHead = 0;
|
||
|
|
UART_TxTail = 0;
|
||
|
|
UART_RxHead = 0;
|
||
|
|
UART_RxTail = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#if defined(AT90_UART)
|
||
|
|
/* set baud rate */
|
||
|
|
UBRR = (uint8_t) baudrate;
|
||
|
|
|
||
|
|
/* enable UART receiver and transmitter and receive complete interrupt */
|
||
|
|
UART0_CONTROL = _BV(RXCIE)|_BV(RXEN)|_BV(TXEN);
|
||
|
|
|
||
|
|
#elif defined (ATMEGA_USART)
|
||
|
|
/* Set baud rate */
|
||
|
|
if (baudrate & 0x8000) {
|
||
|
|
UART0_STATUS = (1<<U2X); //Enable 2x speed
|
||
|
|
baudrate &= ~0x8000;
|
||
|
|
}
|
||
|
|
UBRRH = (uint8_t) (baudrate>>8);
|
||
|
|
UBRRL = (uint8_t) baudrate;
|
||
|
|
|
||
|
|
/* Enable USART receiver and transmitter and receive complete interrupt */
|
||
|
|
UART0_CONTROL = _BV(RXCIE)|(1<<RXEN)|(1<<TXEN);
|
||
|
|
|
||
|
|
/* Set frame format: asynchronous, 8data, no parity, 1stop bit */
|
||
|
|
#ifdef URSEL
|
||
|
|
UCSRC = (1<<URSEL)|(3<<UCSZ0);
|
||
|
|
#else
|
||
|
|
UCSRC = (3<<UCSZ0);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#elif defined (ATMEGA_USART0)
|
||
|
|
/* Set baud rate */
|
||
|
|
if (baudrate & 0x8000) {
|
||
|
|
UART0_STATUS = (1<<U2X0); //Enable 2x speed
|
||
|
|
baudrate &= ~0x8000;
|
||
|
|
}
|
||
|
|
UBRR0H = (uint8_t)(baudrate>>8);
|
||
|
|
UBRR0L = (uint8_t) baudrate;
|
||
|
|
|
||
|
|
/* Enable USART receiver and transmitter and receive complete interrupt */
|
||
|
|
UART0_CONTROL = _BV(RXCIE0)|(1<<RXEN0)|(1<<TXEN0);
|
||
|
|
|
||
|
|
/* Set frame format: asynchronous, 8data, no parity, 1stop bit */
|
||
|
|
#ifdef URSEL0
|
||
|
|
UCSR0C = (1<<URSEL0)|(3<<UCSZ00);
|
||
|
|
#else
|
||
|
|
UCSR0C = (3<<UCSZ00);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#elif defined (ATMEGA_UART)
|
||
|
|
/* set baud rate */
|
||
|
|
if (baudrate & 0x8000) {
|
||
|
|
UART0_STATUS = (1<<U2X); //Enable 2x speed
|
||
|
|
baudrate &= ~0x8000;
|
||
|
|
}
|
||
|
|
UBRRHI = (uint8_t) (baudrate>>8);
|
||
|
|
UBRR = (uint8_t) baudrate;
|
||
|
|
|
||
|
|
/* Enable UART receiver and transmitter and receive complete interrupt */
|
||
|
|
UART0_CONTROL = _BV(RXCIE)|(1<<RXEN)|(1<<TXEN);
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
} /* uart0_init */
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart0_getc()
|
||
|
|
Purpose: return byte from ringbuffer
|
||
|
|
Returns: lower byte: received byte from ringbuffer
|
||
|
|
higher byte: last receive error
|
||
|
|
**************************************************************************/
|
||
|
|
uint16_t uart0_getc(void)
|
||
|
|
{
|
||
|
|
uint16_t tmptail;
|
||
|
|
uint8_t data;
|
||
|
|
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
if (UART_RxHead == UART_RxTail) {
|
||
|
|
return UART_NO_DATA; /* no data available */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* calculate / store buffer index */
|
||
|
|
tmptail = (UART_RxTail + 1) & UART_RX0_BUFFER_MASK;
|
||
|
|
|
||
|
|
UART_RxTail = tmptail;
|
||
|
|
|
||
|
|
/* get data from receive buffer */
|
||
|
|
data = UART_RxBuf[tmptail];
|
||
|
|
|
||
|
|
return (UART_LastRxError << 8) + data;
|
||
|
|
|
||
|
|
} /* uart0_getc */
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart0_peek()
|
||
|
|
Purpose: Returns the next byte (character) of incoming UART data without
|
||
|
|
removing it from the ring buffer. That is, successive calls to
|
||
|
|
uartN_peek() will return the same character, as will the next
|
||
|
|
call to uartN_getc()
|
||
|
|
Returns: lower byte: next byte in ring buffer
|
||
|
|
higher byte: last receive error
|
||
|
|
**************************************************************************/
|
||
|
|
uint16_t uart0_peek(void)
|
||
|
|
{
|
||
|
|
uint16_t tmptail;
|
||
|
|
uint8_t data;
|
||
|
|
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
if (UART_RxHead == UART_RxTail) {
|
||
|
|
return UART_NO_DATA; /* no data available */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
tmptail = (UART_RxTail + 1) & UART_RX0_BUFFER_MASK;
|
||
|
|
|
||
|
|
/* get data from receive buffer */
|
||
|
|
data = UART_RxBuf[tmptail];
|
||
|
|
|
||
|
|
return (UART_LastRxError << 8) + data;
|
||
|
|
|
||
|
|
} /* uart0_peek */
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart0_putc()
|
||
|
|
Purpose: write byte to ringbuffer for transmitting via UART
|
||
|
|
Input: byte to be transmitted
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart0_putc(uint8_t data)
|
||
|
|
{
|
||
|
|
|
||
|
|
#ifdef USART0_LARGE_BUFFER
|
||
|
|
uint16_t tmphead;
|
||
|
|
uint16_t txtail_tmp;
|
||
|
|
|
||
|
|
tmphead = (UART_TxHead + 1) & UART_TX0_BUFFER_MASK;
|
||
|
|
|
||
|
|
do {
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
txtail_tmp = UART_TxTail;
|
||
|
|
}
|
||
|
|
} while (tmphead == txtail_tmp); /* wait for free space in buffer */
|
||
|
|
#else
|
||
|
|
uint16_t tmphead;
|
||
|
|
|
||
|
|
tmphead = (UART_TxHead + 1) & UART_TX0_BUFFER_MASK;
|
||
|
|
|
||
|
|
while (tmphead == UART_TxTail); /* wait for free space in buffer */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
UART_TxBuf[tmphead] = data;
|
||
|
|
UART_TxHead = tmphead;
|
||
|
|
|
||
|
|
/* enable UDRE interrupt */
|
||
|
|
UART0_CONTROL |= _BV(UART0_UDRIE);
|
||
|
|
|
||
|
|
} /* uart0_putc */
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart0_puts()
|
||
|
|
Purpose: transmit string to UART
|
||
|
|
Input: string to be transmitted
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart0_puts(const char *s)
|
||
|
|
{
|
||
|
|
while (*s) {
|
||
|
|
uart0_putc(*s++);
|
||
|
|
}
|
||
|
|
|
||
|
|
} /* uart0_puts */
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart0_puts_p()
|
||
|
|
Purpose: transmit string from program memory to UART
|
||
|
|
Input: program memory string to be transmitted
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart0_puts_p(const char *progmem_s)
|
||
|
|
{
|
||
|
|
register char c;
|
||
|
|
|
||
|
|
while ((c = pgm_read_byte(progmem_s++))) {
|
||
|
|
uart0_putc(c);
|
||
|
|
}
|
||
|
|
|
||
|
|
} /* uart0_puts_p */
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart0_available()
|
||
|
|
Purpose: Determine the number of bytes waiting in the receive buffer
|
||
|
|
Input: None
|
||
|
|
Returns: Integer number of bytes in the receive buffer
|
||
|
|
**************************************************************************/
|
||
|
|
uint16_t uart0_available(void)
|
||
|
|
{
|
||
|
|
uint16_t ret;
|
||
|
|
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
ret = (UART_RX0_BUFFER_SIZE + UART_RxHead - UART_RxTail) & UART_RX0_BUFFER_MASK;
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
} /* uart0_available */
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart0_flush()
|
||
|
|
Purpose: Flush bytes waiting the receive buffer. Actually ignores them.
|
||
|
|
Input: None
|
||
|
|
Returns: None
|
||
|
|
**************************************************************************/
|
||
|
|
void uart0_flush(void)
|
||
|
|
{
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
UART_RxHead = UART_RxTail;
|
||
|
|
}
|
||
|
|
} /* uart0_flush */
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* defined(USART0_ENABLED) */
|
||
|
|
|
||
|
|
#if defined(USART1_ENABLED)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* these functions are only for ATmegas with two USART
|
||
|
|
*/
|
||
|
|
#if defined(ATMEGA_USART1)
|
||
|
|
|
||
|
|
ISR(UART1_RECEIVE_INTERRUPT)
|
||
|
|
/*************************************************************************
|
||
|
|
Function: UART1 Receive Complete interrupt
|
||
|
|
Purpose: called when the UART1 has received a character
|
||
|
|
**************************************************************************/
|
||
|
|
{
|
||
|
|
uint16_t tmphead;
|
||
|
|
uint8_t data;
|
||
|
|
uint8_t usr;
|
||
|
|
uint8_t 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_RX1_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;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
ISR(UART1_TRANSMIT_INTERRUPT)
|
||
|
|
/*************************************************************************
|
||
|
|
Function: UART1 Data Register Empty interrupt
|
||
|
|
Purpose: called when the UART1 is ready to transmit the next byte
|
||
|
|
**************************************************************************/
|
||
|
|
{
|
||
|
|
uint16_t tmptail;
|
||
|
|
|
||
|
|
if (UART1_TxHead != UART1_TxTail) {
|
||
|
|
/* calculate and store new buffer index */
|
||
|
|
tmptail = (UART1_TxTail + 1) & UART_TX1_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(uint16_t baudrate)
|
||
|
|
{
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
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 = (uint8_t) (baudrate>>8);
|
||
|
|
UBRR1L = (uint8_t) 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
|
||
|
|
**************************************************************************/
|
||
|
|
uint16_t uart1_getc(void)
|
||
|
|
{
|
||
|
|
uint16_t tmptail;
|
||
|
|
uint8_t data;
|
||
|
|
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
if (UART1_RxHead == UART1_RxTail) {
|
||
|
|
return UART_NO_DATA; /* no data available */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* calculate / store buffer index */
|
||
|
|
tmptail = (UART1_RxTail + 1) & UART_RX1_BUFFER_MASK;
|
||
|
|
UART1_RxTail = tmptail;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* get data from receive buffer */
|
||
|
|
data = UART1_RxBuf[tmptail];
|
||
|
|
|
||
|
|
return (UART1_LastRxError << 8) + data;
|
||
|
|
|
||
|
|
} /* uart1_getc */
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart1_peek()
|
||
|
|
Purpose: Returns the next byte (character) of incoming UART data without
|
||
|
|
removing it from the ring buffer. That is, successive calls to
|
||
|
|
uartN_peek() will return the same character, as will the next
|
||
|
|
call to uartN_getc()
|
||
|
|
Returns: lower byte: next byte in ring buffer
|
||
|
|
higher byte: last receive error
|
||
|
|
**************************************************************************/
|
||
|
|
uint16_t uart1_peek(void)
|
||
|
|
{
|
||
|
|
uint16_t tmptail;
|
||
|
|
uint8_t data;
|
||
|
|
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
if (UART1_RxHead == UART1_RxTail) {
|
||
|
|
return UART_NO_DATA; /* no data available */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
tmptail = (UART1_RxTail + 1) & UART_RX1_BUFFER_MASK;
|
||
|
|
|
||
|
|
/* get data from receive buffer */
|
||
|
|
data = UART1_RxBuf[tmptail];
|
||
|
|
|
||
|
|
return (UART1_LastRxError << 8) + data;
|
||
|
|
|
||
|
|
} /* uart1_peek */
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart1_putc()
|
||
|
|
Purpose: write byte to ringbuffer for transmitting via UART
|
||
|
|
Input: byte to be transmitted
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart1_putc(uint8_t data)
|
||
|
|
{
|
||
|
|
|
||
|
|
#ifdef USART1_LARGE_BUFFER
|
||
|
|
uint16_t tmphead;
|
||
|
|
uint16_t txtail_tmp;
|
||
|
|
|
||
|
|
tmphead = (UART1_TxHead + 1) & UART_TX1_BUFFER_MASK;
|
||
|
|
|
||
|
|
do {
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
txtail_tmp = UART1_TxTail;
|
||
|
|
}
|
||
|
|
} while (tmphead == txtail_tmp); /* wait for free space in buffer */
|
||
|
|
#else
|
||
|
|
uint16_t tmphead;
|
||
|
|
|
||
|
|
tmphead = (UART1_TxHead + 1) & UART_TX1_BUFFER_MASK;
|
||
|
|
|
||
|
|
while (tmphead == UART1_TxTail); /* wait for free space in buffer */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
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
|
||
|
|
**************************************************************************/
|
||
|
|
uint16_t uart1_available(void)
|
||
|
|
{
|
||
|
|
uint16_t ret;
|
||
|
|
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
ret = (UART_RX1_BUFFER_SIZE + UART1_RxHead - UART1_RxTail) & UART_RX1_BUFFER_MASK;
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
} /* uart1_available */
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart1_flush()
|
||
|
|
Purpose: Flush bytes waiting the receive buffer. Actually ignores them.
|
||
|
|
Input: None
|
||
|
|
Returns: None
|
||
|
|
**************************************************************************/
|
||
|
|
void uart1_flush(void)
|
||
|
|
{
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
UART1_RxHead = UART1_RxTail;
|
||
|
|
}
|
||
|
|
} /* uart1_flush */
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* defined(USART1_ENABLED) */
|
||
|
|
|
||
|
|
#if defined(USART2_ENABLED)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* these functions are only for ATmegas with four USART
|
||
|
|
*/
|
||
|
|
#if defined(ATMEGA_USART2)
|
||
|
|
|
||
|
|
ISR(UART2_RECEIVE_INTERRUPT)
|
||
|
|
/*************************************************************************
|
||
|
|
Function: UART2 Receive Complete interrupt
|
||
|
|
Purpose: called when the UART2 has received a character
|
||
|
|
**************************************************************************/
|
||
|
|
{
|
||
|
|
uint16_t tmphead;
|
||
|
|
uint8_t data;
|
||
|
|
uint8_t usr;
|
||
|
|
uint8_t lastRxError;
|
||
|
|
|
||
|
|
|
||
|
|
/* read UART status register and UART data register */
|
||
|
|
usr = UART2_STATUS;
|
||
|
|
data = UART2_DATA;
|
||
|
|
|
||
|
|
/* */
|
||
|
|
lastRxError = (usr & (_BV(FE2)|_BV(DOR2)));
|
||
|
|
|
||
|
|
/* calculate buffer index */
|
||
|
|
tmphead = (UART2_RxHead + 1) & UART_RX2_BUFFER_MASK;
|
||
|
|
|
||
|
|
if (tmphead == UART2_RxTail) {
|
||
|
|
/* error: receive buffer overflow */
|
||
|
|
lastRxError = UART_BUFFER_OVERFLOW >> 8;
|
||
|
|
} else {
|
||
|
|
/* store new index */
|
||
|
|
UART2_RxHead = tmphead;
|
||
|
|
/* store received data in buffer */
|
||
|
|
UART2_RxBuf[tmphead] = data;
|
||
|
|
}
|
||
|
|
UART2_LastRxError = lastRxError;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
ISR(UART2_TRANSMIT_INTERRUPT)
|
||
|
|
/*************************************************************************
|
||
|
|
Function: UART2 Data Register Empty interrupt
|
||
|
|
Purpose: called when the UART2 is ready to transmit the next byte
|
||
|
|
**************************************************************************/
|
||
|
|
{
|
||
|
|
uint16_t tmptail;
|
||
|
|
|
||
|
|
|
||
|
|
if (UART2_TxHead != UART2_TxTail) {
|
||
|
|
/* calculate and store new buffer index */
|
||
|
|
tmptail = (UART2_TxTail + 1) & UART_TX2_BUFFER_MASK;
|
||
|
|
UART2_TxTail = tmptail;
|
||
|
|
/* get one byte from buffer and write it to UART */
|
||
|
|
UART2_DATA = UART2_TxBuf[tmptail]; /* start transmission */
|
||
|
|
} else {
|
||
|
|
/* tx buffer empty, disable UDRE interrupt */
|
||
|
|
UART2_CONTROL &= ~_BV(UART2_UDRIE);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart2_init()
|
||
|
|
Purpose: initialize UART2 and set baudrate
|
||
|
|
Input: baudrate using macro UART_BAUD_SELECT()
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart2_init(uint16_t baudrate)
|
||
|
|
{
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
UART2_TxHead = 0;
|
||
|
|
UART2_TxTail = 0;
|
||
|
|
UART2_RxHead = 0;
|
||
|
|
UART2_RxTail = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set baud rate */
|
||
|
|
if (baudrate & 0x8000) {
|
||
|
|
UART2_STATUS = (1<<U2X2); //Enable 2x speed
|
||
|
|
baudrate &= ~0x8000;
|
||
|
|
}
|
||
|
|
UBRR2H = (uint8_t) (baudrate>>8);
|
||
|
|
UBRR2L = (uint8_t) baudrate;
|
||
|
|
|
||
|
|
/* Enable USART receiver and transmitter and receive complete interrupt */
|
||
|
|
UART2_CONTROL = _BV(RXCIE2)|(1<<RXEN2)|(1<<TXEN2);
|
||
|
|
|
||
|
|
/* Set frame format: asynchronous, 8data, no parity, 1stop bit */
|
||
|
|
#ifdef URSEL2
|
||
|
|
UCSR2C = (1<<URSEL2)|(3<<UCSZ20);
|
||
|
|
#else
|
||
|
|
UCSR2C = (3<<UCSZ20);
|
||
|
|
#endif
|
||
|
|
} /* uart_init */
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart2_getc()
|
||
|
|
Purpose: return byte from ringbuffer
|
||
|
|
Returns: lower byte: received byte from ringbuffer
|
||
|
|
higher byte: last receive error
|
||
|
|
**************************************************************************/
|
||
|
|
uint16_t uart2_getc(void)
|
||
|
|
{
|
||
|
|
uint16_t tmptail;
|
||
|
|
uint8_t data;
|
||
|
|
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
if (UART2_RxHead == UART2_RxTail) {
|
||
|
|
return UART_NO_DATA; /* no data available */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* calculate / store buffer index */
|
||
|
|
|
||
|
|
tmptail = (UART2_RxTail + 1) & UART_RX2_BUFFER_MASK;
|
||
|
|
UART2_RxTail = tmptail;
|
||
|
|
|
||
|
|
/* get data from receive buffer */
|
||
|
|
data = UART2_RxBuf[tmptail];
|
||
|
|
|
||
|
|
return (UART2_LastRxError << 8) + data;
|
||
|
|
|
||
|
|
} /* uart2_getc */
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart2_peek()
|
||
|
|
Purpose: Returns the next byte (character) of incoming UART data without
|
||
|
|
removing it from the ring buffer. That is, successive calls to
|
||
|
|
uartN_peek() will return the same character, as will the next
|
||
|
|
call to uartN_getc()
|
||
|
|
Returns: lower byte: next byte in ring buffer
|
||
|
|
higher byte: last receive error
|
||
|
|
**************************************************************************/
|
||
|
|
uint16_t uart2_peek(void)
|
||
|
|
{
|
||
|
|
uint16_t tmptail;
|
||
|
|
uint8_t data;
|
||
|
|
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
if (UART2_RxHead == UART2_RxTail) {
|
||
|
|
return UART_NO_DATA; /* no data available */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
tmptail = (UART2_RxTail + 1) & UART_RX2_BUFFER_MASK;
|
||
|
|
|
||
|
|
/* get data from receive buffer */
|
||
|
|
data = UART2_RxBuf[tmptail];
|
||
|
|
|
||
|
|
return (UART2_LastRxError << 8) + data;
|
||
|
|
|
||
|
|
} /* uart2_peek */
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart2_putc()
|
||
|
|
Purpose: write byte to ringbuffer for transmitting via UART
|
||
|
|
Input: byte to be transmitted
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart2_putc(uint8_t data)
|
||
|
|
{
|
||
|
|
|
||
|
|
#ifdef USART2_LARGE_BUFFER
|
||
|
|
uint16_t tmphead;
|
||
|
|
uint16_t txtail_tmp;
|
||
|
|
|
||
|
|
tmphead = (UART2_TxHead + 1) & UART_TX2_BUFFER_MASK;
|
||
|
|
|
||
|
|
do {
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
txtail_tmp = UART2_TxTail;
|
||
|
|
}
|
||
|
|
} while (tmphead == txtail_tmp); /* wait for free space in buffer */
|
||
|
|
#else
|
||
|
|
uint16_t tmphead;
|
||
|
|
|
||
|
|
tmphead = (UART2_TxHead + 1) & UART_TX2_BUFFER_MASK;
|
||
|
|
|
||
|
|
while (tmphead == UART2_TxTail); /* wait for free space in buffer */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
UART2_TxBuf[tmphead] = data;
|
||
|
|
UART2_TxHead = tmphead;
|
||
|
|
|
||
|
|
/* enable UDRE interrupt */
|
||
|
|
UART2_CONTROL |= _BV(UART2_UDRIE);
|
||
|
|
|
||
|
|
} /* uart2_putc */
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart2_puts()
|
||
|
|
Purpose: transmit string to UART2
|
||
|
|
Input: string to be transmitted
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart2_puts(const char *s)
|
||
|
|
{
|
||
|
|
while (*s)
|
||
|
|
uart2_putc(*s++);
|
||
|
|
|
||
|
|
} /* uart2_puts */
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart2_puts_p()
|
||
|
|
Purpose: transmit string from program memory to UART2
|
||
|
|
Input: program memory string to be transmitted
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart2_puts_p(const char *progmem_s)
|
||
|
|
{
|
||
|
|
register char c;
|
||
|
|
|
||
|
|
while ((c = pgm_read_byte(progmem_s++))) {
|
||
|
|
uart2_putc(c);
|
||
|
|
}
|
||
|
|
|
||
|
|
} /* uart2_puts_p */
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart2_available()
|
||
|
|
Purpose: Determine the number of bytes waiting in the receive buffer
|
||
|
|
Input: None
|
||
|
|
Returns: Integer number of bytes in the receive buffer
|
||
|
|
**************************************************************************/
|
||
|
|
uint16_t uart2_available(void)
|
||
|
|
{
|
||
|
|
uint16_t ret;
|
||
|
|
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
ret = (UART_RX2_BUFFER_SIZE + UART2_RxHead - UART2_RxTail) & UART_RX2_BUFFER_MASK;
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
} /* uart2_available */
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart2_flush()
|
||
|
|
Purpose: Flush bytes waiting the receive buffer. Actually ignores them.
|
||
|
|
Input: None
|
||
|
|
Returns: None
|
||
|
|
**************************************************************************/
|
||
|
|
void uart2_flush(void)
|
||
|
|
{
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
UART2_RxHead = UART2_RxTail;
|
||
|
|
}
|
||
|
|
} /* uart2_flush */
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* defined(USART2_ENABLED) */
|
||
|
|
|
||
|
|
#if defined(USART3_ENABLED)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* these functions are only for ATmegas with four USART
|
||
|
|
*/
|
||
|
|
#if defined(ATMEGA_USART3)
|
||
|
|
|
||
|
|
ISR(UART3_RECEIVE_INTERRUPT)
|
||
|
|
/*************************************************************************
|
||
|
|
Function: UART3 Receive Complete interrupt
|
||
|
|
Purpose: called when the UART3 has received a character
|
||
|
|
**************************************************************************/
|
||
|
|
{
|
||
|
|
uint16_t tmphead;
|
||
|
|
uint8_t data;
|
||
|
|
uint8_t usr;
|
||
|
|
uint8_t lastRxError;
|
||
|
|
|
||
|
|
/* read UART status register and UART data register */
|
||
|
|
usr = UART3_STATUS;
|
||
|
|
data = UART3_DATA;
|
||
|
|
|
||
|
|
/* */
|
||
|
|
lastRxError = (usr & (_BV(FE3)|_BV(DOR3)));
|
||
|
|
|
||
|
|
/* calculate buffer index */
|
||
|
|
tmphead = (UART3_RxHead + 1) & UART_RX3_BUFFER_MASK;
|
||
|
|
|
||
|
|
if (tmphead == UART3_RxTail) {
|
||
|
|
/* error: receive buffer overflow */
|
||
|
|
lastRxError = UART_BUFFER_OVERFLOW >> 8;
|
||
|
|
} else {
|
||
|
|
/* store new index */
|
||
|
|
UART3_RxHead = tmphead;
|
||
|
|
/* store received data in buffer */
|
||
|
|
UART3_RxBuf[tmphead] = data;
|
||
|
|
}
|
||
|
|
UART3_LastRxError = lastRxError;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
ISR(UART3_TRANSMIT_INTERRUPT)
|
||
|
|
/*************************************************************************
|
||
|
|
Function: UART3 Data Register Empty interrupt
|
||
|
|
Purpose: called when the UART3 is ready to transmit the next byte
|
||
|
|
**************************************************************************/
|
||
|
|
{
|
||
|
|
uint16_t tmptail;
|
||
|
|
|
||
|
|
|
||
|
|
if (UART3_TxHead != UART3_TxTail) {
|
||
|
|
/* calculate and store new buffer index */
|
||
|
|
tmptail = (UART3_TxTail + 1) & UART_TX3_BUFFER_MASK;
|
||
|
|
UART3_TxTail = tmptail;
|
||
|
|
/* get one byte from buffer and write it to UART */
|
||
|
|
UART3_DATA = UART3_TxBuf[tmptail]; /* start transmission */
|
||
|
|
} else {
|
||
|
|
/* tx buffer empty, disable UDRE interrupt */
|
||
|
|
UART3_CONTROL &= ~_BV(UART3_UDRIE);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart3_init()
|
||
|
|
Purpose: initialize UART3 and set baudrate
|
||
|
|
Input: baudrate using macro UART_BAUD_SELECT()
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart3_init(uint16_t baudrate)
|
||
|
|
{
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
UART3_TxHead = 0;
|
||
|
|
UART3_TxTail = 0;
|
||
|
|
UART3_RxHead = 0;
|
||
|
|
UART3_RxTail = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set baud rate */
|
||
|
|
if (baudrate & 0x8000) {
|
||
|
|
UART3_STATUS = (1<<U2X3); //Enable 2x speed
|
||
|
|
baudrate &= ~0x8000;
|
||
|
|
}
|
||
|
|
UBRR3H = (uint8_t)(baudrate>>8);
|
||
|
|
UBRR3L = (uint8_t) baudrate;
|
||
|
|
|
||
|
|
/* Enable USART receiver and transmitter and receive complete interrupt */
|
||
|
|
UART3_CONTROL = _BV(RXCIE3)|(1<<RXEN3)|(1<<TXEN3);
|
||
|
|
|
||
|
|
/* Set frame format: asynchronous, 8data, no parity, 1stop bit */
|
||
|
|
#ifdef URSEL3
|
||
|
|
UCSR3C = (1<<URSEL3)|(3<<UCSZ30);
|
||
|
|
#else
|
||
|
|
UCSR3C = (3<<UCSZ30);
|
||
|
|
#endif
|
||
|
|
} /* uart_init */
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart3_getc()
|
||
|
|
Purpose: return byte from ringbuffer
|
||
|
|
Returns: lower byte: received byte from ringbuffer
|
||
|
|
higher byte: last receive error
|
||
|
|
**************************************************************************/
|
||
|
|
uint16_t uart3_getc(void)
|
||
|
|
{
|
||
|
|
uint16_t tmptail;
|
||
|
|
uint8_t data;
|
||
|
|
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
if (UART3_RxHead == UART3_RxTail) {
|
||
|
|
return UART_NO_DATA; /* no data available */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* calculate / store buffer index */
|
||
|
|
tmptail = (UART3_RxTail + 1) & UART_RX3_BUFFER_MASK;
|
||
|
|
UART3_RxTail = tmptail;
|
||
|
|
|
||
|
|
/* get data from receive buffer */
|
||
|
|
data = UART3_RxBuf[tmptail];
|
||
|
|
|
||
|
|
return (UART3_LastRxError << 8) + data;
|
||
|
|
|
||
|
|
} /* uart3_getc */
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart3_peek()
|
||
|
|
Purpose: Returns the next byte (character) of incoming UART data without
|
||
|
|
removing it from the ring buffer. That is, successive calls to
|
||
|
|
uartN_peek() will return the same character, as will the next
|
||
|
|
call to uartN_getc()
|
||
|
|
Returns: lower byte: next byte in ring buffer
|
||
|
|
higher byte: last receive error
|
||
|
|
**************************************************************************/
|
||
|
|
uint16_t uart3_peek(void)
|
||
|
|
{
|
||
|
|
uint16_t tmptail;
|
||
|
|
uint8_t data;
|
||
|
|
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
if (UART3_RxHead == UART3_RxTail) {
|
||
|
|
return UART_NO_DATA; /* no data available */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
tmptail = (UART3_RxTail + 1) & UART_RX3_BUFFER_MASK;
|
||
|
|
|
||
|
|
/* get data from receive buffer */
|
||
|
|
data = UART3_RxBuf[tmptail];
|
||
|
|
|
||
|
|
return (UART3_LastRxError << 8) + data;
|
||
|
|
|
||
|
|
} /* uart3_peek */
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart3_putc()
|
||
|
|
Purpose: write byte to ringbuffer for transmitting via UART
|
||
|
|
Input: byte to be transmitted
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart3_putc(uint8_t data)
|
||
|
|
{
|
||
|
|
|
||
|
|
#ifdef USART3_LARGE_BUFFER
|
||
|
|
uint16_t tmphead;
|
||
|
|
uint16_t txtail_tmp;
|
||
|
|
|
||
|
|
tmphead = (UART3_TxHead + 1) & UART_TX3_BUFFER_MASK;
|
||
|
|
|
||
|
|
do {
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
txtail_tmp = UART3_TxTail;
|
||
|
|
}
|
||
|
|
} while (tmphead == txtail_tmp); /* wait for free space in buffer */
|
||
|
|
#else
|
||
|
|
uint16_t tmphead;
|
||
|
|
|
||
|
|
tmphead = (UART3_TxHead + 1) & UART_TX3_BUFFER_MASK;
|
||
|
|
|
||
|
|
while (tmphead == UART3_TxTail); /* wait for free space in buffer */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
UART3_TxBuf[tmphead] = data;
|
||
|
|
UART3_TxHead = tmphead;
|
||
|
|
|
||
|
|
/* enable UDRE interrupt */
|
||
|
|
UART3_CONTROL |= _BV(UART3_UDRIE);
|
||
|
|
|
||
|
|
} /* uart3_putc */
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart3_puts()
|
||
|
|
Purpose: transmit string to UART3
|
||
|
|
Input: string to be transmitted
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart3_puts(const char *s)
|
||
|
|
{
|
||
|
|
while (*s) {
|
||
|
|
uart3_putc(*s++);
|
||
|
|
}
|
||
|
|
|
||
|
|
} /* uart3_puts */
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart3_puts_p()
|
||
|
|
Purpose: transmit string from program memory to UART3
|
||
|
|
Input: program memory string to be transmitted
|
||
|
|
Returns: none
|
||
|
|
**************************************************************************/
|
||
|
|
void uart3_puts_p(const char *progmem_s)
|
||
|
|
{
|
||
|
|
register char c;
|
||
|
|
|
||
|
|
while ((c = pgm_read_byte(progmem_s++))) {
|
||
|
|
uart3_putc(c);
|
||
|
|
}
|
||
|
|
|
||
|
|
} /* uart3_puts_p */
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart3_available()
|
||
|
|
Purpose: Determine the number of bytes waiting in the receive buffer
|
||
|
|
Input: None
|
||
|
|
Returns: Integer number of bytes in the receive buffer
|
||
|
|
**************************************************************************/
|
||
|
|
uint16_t uart3_available(void)
|
||
|
|
{
|
||
|
|
uint16_t ret;
|
||
|
|
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
ret = (UART_RX3_BUFFER_SIZE + UART3_RxHead - UART3_RxTail) & UART_RX3_BUFFER_MASK;
|
||
|
|
}
|
||
|
|
return ret;
|
||
|
|
} /* uart3_available */
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/*************************************************************************
|
||
|
|
Function: uart3_flush()
|
||
|
|
Purpose: Flush bytes waiting the receive buffer. Actually ignores them.
|
||
|
|
Input: None
|
||
|
|
Returns: None
|
||
|
|
**************************************************************************/
|
||
|
|
void uart3_flush(void)
|
||
|
|
{
|
||
|
|
ATOMIC_BLOCK(ATOMIC_FORCEON) {
|
||
|
|
UART3_RxHead = UART3_RxTail;
|
||
|
|
}
|
||
|
|
} /* uart3_flush */
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* defined(USART3_ENABLED) */
|