226a318897
Use real GPIO pad inversion to allow inverted RX, TX, and controls for the hardware UART and software PIO-emulated serial ports. Adds ``setInvertTX(bool)`` and ``setInvertRX(bool)`` calls to both ports, with ``setInvertControl(bool)`` for the HW UARTS.
106 lines
2.9 KiB
C++
106 lines
2.9 KiB
C++
/*
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Serial-over-PIO for the Raspberry Pi Pico RP2040
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Copyright (c) 2021 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 <Arduino.h>
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#include "api/HardwareSerial.h"
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#include <stdarg.h>
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#include <queue>
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#include <hardware/uart.h>
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#include "CoreMutex.h"
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extern "C" typedef struct uart_inst uart_inst_t;
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class SerialPIO : public HardwareSerial {
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public:
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static const pin_size_t NOPIN = 0xff; // Use in constructor to disable RX or TX unit
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SerialPIO(pin_size_t tx, pin_size_t rx, size_t fifoSize = 32);
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~SerialPIO();
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void begin(unsigned long baud = 115200) override {
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begin(baud, SERIAL_8N1);
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};
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void begin(unsigned long baud, uint16_t config) override;
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void end() override;
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void setInverted(bool invTx = true, bool invRx = true) {
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setInvertTX(invTx);
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setInvertRX(invRx);
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}
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bool setInvertTX(bool invert = true) {
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if (!_running) {
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_invertTX = invert;
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}
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return !_running;
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}
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bool setInvertRX(bool invert = true) {
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if (!_running) {
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_invertRX = invert;
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}
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return !_running;
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}
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virtual int peek() override;
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virtual int read() override;
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virtual int available() override;
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virtual int availableForWrite() override;
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virtual void flush() override;
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virtual size_t write(uint8_t c) override;
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bool overflow();
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using Print::write;
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operator bool() override;
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// Not to be called by users, only from the IRQ handler. In public so that the C-language IRQ callback can access it
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void _handleIRQ();
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protected:
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bool _running = false;
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pin_size_t _tx, _rx;
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int _baud;
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int _bits;
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uart_parity_t _parity;
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int _stop;
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bool _overflow;
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mutex_t _mutex;
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bool _invertTX;
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bool _invertRX;
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PIOProgram *_txPgm;
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PIO _txPIO;
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int _txSM;
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int _txBits;
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PIOProgram *_rxPgm;
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PIO _rxPIO;
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int _rxSM;
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int _rxBits;
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// Lockless, IRQ-handled circular queue
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size_t _fifoSize;
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uint32_t _writer;
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uint32_t _reader;
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uint8_t *_queue;
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};
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#ifdef ARDUINO_NANO_RP2040_CONNECT
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// NINA updates
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extern SerialPIO Serial3;
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#endif
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