2010-08-23 03:25:03 -03:00
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// -*- Mode: C++; c-basic-offset: 8; indent-tabs-mode: nil -*-
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//
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// Interrupt-driven serial transmit/receive library.
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//
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// Copyright (c) 2010 Michael Smith. All rights reserved.
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//
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// Receive and baudrate calculations derived from the Arduino
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// HardwareSerial driver:
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//
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// Copyright (c) 2006 Nicholas Zambetti. All right reserved.
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//
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// Transmit algorithm inspired by work:
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//
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// Code Jose Julio and Jordi Munoz. DIYDrones.com
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//
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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
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// version.
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//
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// This library is distributed in the hope that it will be
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// useful, but WITHOUT ANY WARRANTY; without even the implied
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// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the GNU Lesser General Public License for more
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// details.
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//
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// You should have received a copy of the GNU Lesser General
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// Public License along with this library; if not, write to the
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// Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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// Boston, MA 02110-1301 USA
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//
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//
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// Note that this library does not pre-declare drivers for serial
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// ports; the user must explicitly create drivers for the ports they
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// wish to use. This is less friendly than the stock Arduino driver,
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// but it saves 256 bytes for every unused port.
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//
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// To adjust the transmit/receive buffer sizes, change the size of the
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// 'bytes' member in the RXBuffer and TXBuffer structures.
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//
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#ifndef FastSerial_h
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#define FastSerial_h
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2010-08-30 01:01:15 -03:00
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// disable the stock Arduino serial driver
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#define HardwareSerial_h
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2010-08-23 03:25:03 -03:00
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#include <inttypes.h>
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#include <Print.h>
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2010-08-30 01:01:15 -03:00
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//
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// Because Arduino libraries aren't really libraries, but we want to
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// only define interrupt handlers for serial ports that are actually
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// used, we have to force our users to define them using a macro.
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//
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// Due to the way interrupt vectors are specified, we have to have
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// a separate macro for every port. Ugh.
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//
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#define FastSerialPort0(_portName) FastSerial _portName(0); FastSerialHandler0
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#if defined(__AVR_ATmega1280__)
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#define FastSerialPort1(_portName) FastSerial _portName(1); FastSerialHandler1
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#define FastSerialPort2(_portName) FastSerial _portName(2); FastSerialHandler2
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#define FastSerialPort3(_portName) FastSerial _portName(3); FastSerialHandler3
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#endif
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2010-08-23 03:25:03 -03:00
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class FastSerial : public Print {
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public:
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FastSerial(uint8_t portNumber = 0);
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// Serial API
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void begin(long baud);
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void end(void);
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uint8_t available(void);
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int read(void);
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void flush(void);
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void write(uint8_t c);
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void write(const uint8_t *buffer, int count);
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using Print::write;
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// Interrupt methods
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void receive(uint8_t c);
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void transmit(void);
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private:
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// register accessors
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volatile uint8_t *_ubrrh;
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volatile uint8_t *_ubrrl;
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volatile uint8_t *_ucsra;
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volatile uint8_t *_ucsrb;
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volatile uint8_t *_udr;
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// register magic numbers
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uint8_t _portEnableBits; // rx, tx and rx interrupt enables
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uint8_t _portTxBits; // tx data and completion interrupt enables
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uint8_t _u2x;
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// ring buffers
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struct RXBuffer {
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volatile uint8_t head;
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uint8_t tail;
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uint8_t bytes[128]; // size must be power of 2 for best results
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};
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struct TXBuffer {
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uint8_t head;
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volatile uint8_t tail;
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uint8_t bytes[64]; // size must be power of 2 for best results
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};
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RXBuffer _rxBuffer;
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TXBuffer _txBuffer;
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};
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2010-08-26 23:29:14 -03:00
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// For clients that want to assume that the default Serial* objects exist.
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2010-08-30 01:01:15 -03:00
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// Note that the application is responsible for ensuring that these actually get defined,
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// otherwise Arduino will suck in the HardwareSerial library and linking will fail.
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2010-08-26 23:29:14 -03:00
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extern class FastSerial Serial;
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extern class FastSerial Serial1;
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extern class FastSerial Serial2;
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extern class FastSerial Serial3;
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2010-08-30 01:01:15 -03:00
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// Used by the per-port interrupt vectors
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extern FastSerial *__FastSerial__ports[];
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// Generic Rx/Tx vectors for a serial port - needs to know magic numbers
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#define FastSerialHandler(_PORT, _RXVECTOR, _TXVECTOR, _UDR) \
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ISR(_RXVECTOR, ISR_BLOCK) \
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{ \
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unsigned char c = _UDR; \
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__FastSerial__ports[_PORT]->receive(c); \
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} \
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ISR(_TXVECTOR, ISR_BLOCK) \
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{ \
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__FastSerial__ports[_PORT]->transmit(); \
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} \
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struct hack
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// Magic numbers for the Rx/Tx vectors indexed by serial port number
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#if defined(__AVR_ATmega8__)
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# define FastSerialHandler0 FastSerialHandler(0, SIG_UART_RECV, SIG_UART_DATA, UDR);
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#else
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# define FastSerialHandler0 FastSerialHandler(0, SIG_USART0_RECV, SIG_USART0_DATA, UDR0);
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#endif
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#if defined(__AVR_ATmega1280__)
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# define FastSerialHandler1 FastSerialHandler(1, SIG_USART1_RECV, SIG_USART1_DATA, UDR1);
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# define FastSerialHandler2 FastSerialHandler(2, SIG_USART2_RECV, SIG_USART2_DATA, UDR2);
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# define FastSerialHandler3 FastSerialHandler(3, SIG_USART3_RECV, SIG_USART3_DATA, UDR3);
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#endif
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2010-08-23 03:25:03 -03:00
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#endif // FastSerial_h
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