81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
/*
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SoftwareSerial wrapper for SerialPIO
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Copyright (c) 2022 Earle F. Philhower, III <earlephilhower@yahoo.com>
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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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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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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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#pragma once
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#include "SerialPIO.h"
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/**
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@brief Implements a UART port using PIO for input and output
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*/
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class SoftwareSerial : public SerialPIO {
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public:
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/**
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@brief Constructs a PIO-based UART
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@param [in] rx GPIO for RX pin or -1 for transmit-only
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@param [in] tx GPIO for TX pin or -1 for receive-only
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@param [in] invert True to invert the receive and transmit lines
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*/
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SoftwareSerial(pin_size_t rx, pin_size_t tx, bool invert = false) : SerialPIO(tx, rx) {
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_invert = invert;
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}
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~SoftwareSerial() {
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}
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/**
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@brief Starts the PIO UART
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@param [in] baud Serial bit rate
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*/
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virtual void begin(unsigned long baud = 115200) override {
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begin(baud, SERIAL_8N1);
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};
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/**
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@brief Starts the PIO UART
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@param [in] baud Serial bit rate
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@param [in] config Start/Stop/Len configuration (i.e. SERIAL_8N1 or SERIAL_7E2)
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*/
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void begin(unsigned long baud, uint16_t config) override {
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setInvertTX(_invert);
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setInvertRX(_invert);
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SerialPIO::begin(baud, config);
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}
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/**
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@brief No-op on this core
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*/
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void listen() { /* noop */ }
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/**
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@brief No-op on this core
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@returns True always
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*/
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bool isListening() {
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return true;
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}
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private:
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bool _invert;
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};
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