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/*
SoftwareSerial.cpp - library for Arduino Primo
Copyright (c) 2016 Arduino. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef SoftwareSerial_h
#define SoftwareSerial_h
#include <inttypes.h>
#include <Stream.h>
#include <variant.h>
/******************************************************************************
* Definitions
******************************************************************************/
#define _SS_MAX_RX_BUFF 64 // RX buffer size
class SoftwareSerial : public Stream
{
private:
// per object data
uint8_t _transmitPin;
uint8_t _receivePin;
uint32_t _receiveBitMask;
volatile uint32_t* _receivePortRegister;
uint32_t _transmitBitMask;
volatile uint32_t* _transmitPortRegister;
volatile uint32_t _intMask;
// Expressed as 4-cycle delays (must never be 0!)
uint16_t _rx_delay_centering;
uint16_t _rx_delay_intrabit;
uint16_t _rx_delay_stopbit;
uint16_t _tx_delay;
uint16_t _buffer_overflow:1;
uint16_t _inverse_logic:1;
// static data
static char _receive_buffer[_SS_MAX_RX_BUFF];
static volatile uint8_t _receive_buffer_tail;
static volatile uint8_t _receive_buffer_head;
static SoftwareSerial *active_object;
// private methods
void recv() __attribute__((__always_inline__));
uint32_t rx_pin_read();
void tx_pin_write(uint8_t pin_state) __attribute__((__always_inline__));
void setTX(uint8_t transmitPin);
void setRX(uint8_t receivePin);
void setRxIntMsk(bool enable) __attribute__((__always_inline__));
public:
// public methods
SoftwareSerial(uint8_t receivePin, uint8_t transmitPin, bool inverse_logic = false);
~SoftwareSerial();
void begin(long speed);
bool listen();
void end();
bool isListening() { return this == active_object; }
bool stopListening();
bool overflow() { bool ret = _buffer_overflow; if (ret) _buffer_overflow = false; return ret; }
int peek();
virtual size_t write(uint8_t byte);
virtual int read();
virtual int available();
virtual void flush();
operator bool() { return true; }
using Print::write;
// public only for easy access by interrupt handlers
static inline void handle_interrupt() __attribute__((__always_inline__));
};
#endif
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