115 lines
3.7 KiB
C++
115 lines
3.7 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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* (https://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 (https://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 (https://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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#pragma once
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#include <Arduino.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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private:
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// per object data
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uint16_t _receivePin;
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uint16_t _transmitPin;
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GPIO_TypeDef *_receivePinPort;
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uint32_t _receivePinNumber;
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GPIO_TypeDef *_transmitPinPort;
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uint32_t _transmitPinNumber;
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uint32_t _speed;
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uint16_t _buffer_overflow: 1;
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uint16_t _inverse_logic: 1;
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uint16_t _half_duplex: 1;
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uint16_t _output_pending: 1;
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unsigned char _receive_buffer[_SS_MAX_RX_BUFF];
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volatile uint8_t _receive_buffer_tail;
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volatile uint8_t _receive_buffer_head;
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uint32_t delta_start = 0;
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// static data
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static HardwareTimer timer;
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static const IRQn_Type timer_interrupt_number;
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static uint32_t timer_interrupt_priority;
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static SoftwareSerial *active_listener;
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static SoftwareSerial *volatile active_out;
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static SoftwareSerial *volatile active_in;
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static int32_t tx_tick_cnt;
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static volatile int32_t rx_tick_cnt;
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static uint32_t tx_buffer;
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static int32_t tx_bit_cnt;
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static uint32_t rx_buffer;
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static int32_t rx_bit_cnt;
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static uint32_t cur_speed;
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// private methods
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void send();
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void recv();
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void setTX();
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void setRX();
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void setSpeed(uint32_t speed);
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void setRXTX(bool input);
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static void handleInterrupt(HardwareTimer *timer);
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public:
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// public methods
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SoftwareSerial(uint16_t receivePin, uint16_t transmitPin, bool inverse_logic=false);
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virtual ~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 active_listener == this; }
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bool stopListening();
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bool overflow() {
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bool ret = _buffer_overflow;
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if (ret) _buffer_overflow = false;
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return ret;
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}
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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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static void setInterruptPriority(uint32_t preemptPriority, uint32_t subPriority);
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using Print::write;
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};
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