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