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Arduino/build/shared/lib/avrlib/conf/uartsw2conf.h
2005-08-25 21:06:28 +00:00

69 lines
2.8 KiB
C
Executable File

/*! \file uartsw2conf.h \brief Interrupt-driven Software UART Driver Configuration. */
//*****************************************************************************
//
// File Name : 'uartsw2conf.h'
// Title : Interrupt-driven Software UART Driver Configuration
// Author : Pascal Stang - Copyright (C) 2002-2003
// Created : 7/20/2002
// Revised : 4/27/2004
// Version : 0.6
// Target MCU : Atmel AVR Series (intended for the ATmega16 and ATmega32)
// Editor Tabs : 4
//
// Description :
// This uart library emulates the operation of a UART (serial port) using
// the AVR's hardware timers, I/O pins, and some software.
//
// Specifically, this code uses:
// -Timer 2 Output Capture for transmit timing
// -Timer 0 Output Capture for receive timing
// -External Interrupt 2 for receive triggering
//
// The above resources cannot be used for other purposes while this software
// UART is enabled. The overflow interrupts from Timer0 and Timer2 can still
// be used for other timing, but the prescalers for these timers must not be
// changed.
//
// Serial output from this UART can be routed to any I/O pin. Serial input
// for this UART must come from the External Interrupt 2 (INT2) I/O pin.
// These options should be configured by editing your local copy of
// "uartsw2conf.h".
//
// This code is distributed under the GNU Public License
// which can be found at http://www.gnu.org/licenses/gpl.txt
//
//*****************************************************************************
#ifndef UARTSW2CONF_H
#define UARTSW2CONF_H
// constants/macros/typdefs
#define UARTSW_RX_BUFFER_SIZE 0x20 ///< UART receive buffer size in bytes
#define UARTSW_INVERT ///< define to invert polarity of RX/TX signals
// when non-inverted, the serial line is appropriate for passing though
// an RS232 driver like the MAX232. When inverted, the serial line can
// directly drive/receive RS232 signals to/from a DB9 connector. Be sure
// to use a current-limiting resistor and perhaps a diode-clamp circuit when
// connecting incoming RS232 signals to a microprocessor I/O pin.
// if non-inverted, the serial line idles high (logic 1) between bytes
// if inverted, the serial line idles low (logic 0) between bytes
// UART transmit pin defines
#define UARTSW_TX_PORT PORTB ///< UART Transmit Port
#define UARTSW_TX_DDR DDRB ///< UART Transmit DDR
#define UARTSW_TX_PIN PB3 ///< UART Transmit Pin
// UART receive pin defines
// This pin must correspond to the
// External Interrupt 2 (INT2) pin for your processor
#define UARTSW_RX_PORT PORTB ///< UART Receive Port
#define UARTSW_RX_DDR DDRB ///< UART Receive DDR
#define UARTSW_RX_PORTIN PINB ///< UART Receive Port Input
#define UARTSW_RX_PIN PB2 ///< UART Receive Pin
#endif