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77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
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/*! \file uartsw2.h \brief Interrupt-driven Software UART Driver. */
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//*****************************************************************************
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//
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// File Name : 'uartsw2.h'
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// Title : Interrupt-driven Software UART Driver
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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 UARTSW2_H
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#define UARTSW2_H
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#include "global.h"
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#include "buffer.h"
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// include configuration
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#include "uartsw2conf.h"
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// constants/macros/typdefs
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// functions
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//! enable and initialize the software uart
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void uartswInit(void);
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//! create and initialize the uart buffers
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void uartswInitBuffers(void);
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//! turns off software UART
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void uartswOff(void);
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//! returns the receive buffer structure
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cBuffer* uartswGetRxBuffer(void);
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//! sets the uart baud rate
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void uartswSetBaudRate(u32 baudrate);
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//! sends a single byte over the uart
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void uartswSendByte(u08 data);
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//! gets a single byte from the uart receive buffer
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// Function returns TRUE if data was available, FALSE if not.
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// Actual data is returned in variable pointed to by "data".
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// example usage:
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// char myReceivedByte;
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// uartswReceiveByte( &myReceivedByte );
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u08 uartswReceiveByte(u08* rxData);
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//! internal transmit bit handler
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void uartswTxBitService(void);
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//! internal receive bit handler
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void uartswRxBitService(void);
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#endif
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