121 lines
3.6 KiB
C++
121 lines
3.6 KiB
C++
/*
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* SoftwareSerial.h (formerly NewSoftSerial.h)
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*
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* Multi-instance software serial library for Arduino/Wiring
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* -- Interrupt-driven receive and other improvements by ladyada
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* (http://ladyada.net)
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* -- Tuning, circular buffer, derivation from class Print/Stream,
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* multi-instance support, porting to 8MHz processors,
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* various optimizations, PROGMEM delay tables, inverse logic and
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* direct port writing by Mikal Hart (http://www.arduiniana.org)
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* -- Pin change interrupt macros by Paul Stoffregen (http://www.pjrc.com)
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* -- 20MHz processor support by Garrett Mace (http://www.macetech.com)
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* -- ATmega1280/2560 support by Brett Hagman (http://www.roguerobotics.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 version.
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*
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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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*
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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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*
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* The latest version of this library can always be found at
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* http://arduiniana.org.
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*/
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#ifndef SOFTWARESERIAL_H
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#define SOFTWARESERIAL_H
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#include "arduino.h"
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#include <stdint.h>
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//#include "serial.h"
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#include <Stream.h>
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#include <Print.h>
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/******************************************************************************
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* Definitions
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******************************************************************************/
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#define _SS_MAX_RX_BUFF 64 // RX buffer size
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class SoftwareSerial : public Stream
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{
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private:
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// per object data
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pin_t _receivePin;
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pin_t _transmitPin;
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// uint32_t _receiveBitMask; // for rx interrupts
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uint32_t _receivePort;
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uint32_t _receivePortPin;
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// Expressed as 4-cycle delays (must never be 0!)
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uint16_t _rx_delay_centering;
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uint16_t _rx_delay_intrabit;
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uint16_t _rx_delay_stopbit;
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uint16_t _tx_delay;
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uint16_t _buffer_overflow:1;
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uint16_t _inverse_logic:1;
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// static data
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static unsigned char _receive_buffer[_SS_MAX_RX_BUFF];
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static volatile uint8_t _receive_buffer_tail;
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static volatile uint8_t _receive_buffer_head;
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static SoftwareSerial *active_object;
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// private methods
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void recv();
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uint32_t rx_pin_read();
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void tx_pin_write(uint8_t pin_state);
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void setTX(pin_t transmitPin);
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void setRX(pin_t receivePin);
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void setRxIntMsk(bool enable);
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// private static method for timing
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static inline void tunedDelay(uint32_t delay);
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public:
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// public methods
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SoftwareSerial(pin_t receivePin, pin_t transmitPin, bool inverse_logic = false);
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~SoftwareSerial();
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void begin(long speed);
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bool listen();
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void end();
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bool isListening() { return this == active_object; }
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bool stopListening();
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bool overflow() { bool ret = _buffer_overflow; if (ret) _buffer_overflow = false; return ret; }
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int peek();
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virtual size_t write(uint8_t byte);
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virtual int read();
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virtual int available();
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virtual void flush();
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operator bool() { return true; }
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using Print::write;
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//using HalSerial::write;
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// public only for easy access by interrupt handlers
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static inline void handle_interrupt() __attribute__((__always_inline__));
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};
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// Arduino 0012 workaround
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#undef int
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#undef char
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#undef long
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#undef byte
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#undef float
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#undef abs
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#undef round
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#endif // SOFTWARESERIAL_H
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