HardwareSerial.h

/*
 HardwareSerial.h - Hardware serial library for Wiring
 Copyright (c) 2006 Nicholas Zambetti.  All right 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

 Modified 28 September 2010 by Mark Sproul
 Modified 14 August 2012 by Alarus
 Modified 3 December 2013 by Matthijs Kooijman
 Modified 18 December 2014 by Ivan Grokhotkov (esp8266 platform support)
 Modified 31 March 2015 by Markus Sattler (rewrite the code for UART0 + UART1 support in ESP8266)
 Modified 25 April 2015 by Thomas Flayols (add configuration different from 8N1 in ESP8266)
 */

#ifndef HardwareSerial_h
#define HardwareSerial_h

#include <inttypes.h>
#include <../include/time.h> // See issue #6714
#include "Stream.h"
#include "uart.h"

enum SerialConfig {
    SERIAL_5N1 = UART_5N1,
    SERIAL_6N1 = UART_6N1,
    SERIAL_7N1 = UART_7N1,
    SERIAL_8N1 = UART_8N1,
    SERIAL_5N2 = UART_5N2,
    SERIAL_6N2 = UART_6N2,
    SERIAL_7N2 = UART_7N2,
    SERIAL_8N2 = UART_8N2,
    SERIAL_5E1 = UART_5E1,
    SERIAL_6E1 = UART_6E1,
    SERIAL_7E1 = UART_7E1,
    SERIAL_8E1 = UART_8E1,
    SERIAL_5E2 = UART_5E2,
    SERIAL_6E2 = UART_6E2,
    SERIAL_7E2 = UART_7E2,
    SERIAL_8E2 = UART_8E2,
    SERIAL_5O1 = UART_5O1,
    SERIAL_6O1 = UART_6O1,
    SERIAL_7O1 = UART_7O1,
    SERIAL_8O1 = UART_8O1,
    SERIAL_5O2 = UART_5O2,
    SERIAL_6O2 = UART_6O2,
    SERIAL_7O2 = UART_7O2,
    SERIAL_8O2 = UART_8O2,
};

enum SerialMode {
    SERIAL_FULL = UART_FULL,
    SERIAL_RX_ONLY = UART_RX_ONLY,
    SERIAL_TX_ONLY = UART_TX_ONLY
};

class HardwareSerial: public Stream
{
public:
    HardwareSerial(int uart_nr);
    virtual ~HardwareSerial() {}

    void begin(unsigned long baud)
    {
        begin(baud, SERIAL_8N1, SERIAL_FULL, 1, false);
    }
    void begin(unsigned long baud, SerialConfig config)
    {
        begin(baud, config, SERIAL_FULL, 1, false);
    }
    void begin(unsigned long baud, SerialConfig config, SerialMode mode)
    {
        begin(baud, config, mode, 1, false);
    }

    void begin(unsigned long baud, SerialConfig config, SerialMode mode, uint8_t tx_pin)
    {
        begin(baud, config, mode, tx_pin, false);
    }

    void begin(unsigned long baud, SerialConfig config, SerialMode mode, uint8_t tx_pin, bool invert);

    void end();

    void updateBaudRate(unsigned long baud);

    size_t setRxBufferSize(size_t size);
    size_t getRxBufferSize()
    {
        return uart_get_rx_buffer_size(_uart);
    }

    void swap()
    {
        swap(1);
    }
    void swap(uint8_t tx_pin)    //toggle between use of GPIO13/GPIO15 or GPIO3/GPIO(1/2) as RX and TX
    {
        uart_swap(_uart, tx_pin);
    }

    /*
     * Toggle between use of GPIO1 and GPIO2 as TX on UART 0.
     * Note: UART 1 can't be used if GPIO2 is used with UART 0!
     */
    void set_tx(uint8_t tx_pin)
    {
        uart_set_tx(_uart, tx_pin);
    }

    /*
     * UART 0 possible options are (1, 3), (2, 3) or (15, 13)
     * UART 1 allows only TX on 2 if UART 0 is not (2, 3)
     */
    void pins(uint8_t tx, uint8_t rx)
    {
        uart_set_pins(_uart, tx, rx);
    }

    int available(void) override;

    int peek(void) override
    {
        // return -1 when data is unvailable (arduino api)
        return uart_peek_char(_uart);
    }

    virtual bool hasPeekBufferAPI () const override
    {
        return true;
    }

    // return a pointer to available data buffer (size = available())
    // semantic forbids any kind of read() before calling peekConsume()
    const char* peekBuffer () override
    {
        return uart_peek_buffer(_uart);
    }

    // return number of byte accessible by peekBuffer()
    size_t peekAvailable () override
    {
        return uart_peek_available(_uart);
    }

    // consume bytes after use (see peekBuffer)
    void peekConsume (size_t consume) override
    {
        return uart_peek_consume(_uart, consume);
    }

    int read(void) override
    {
        // return -1 when data is unvailable (arduino api)
        return uart_read_char(_uart);
    }
    // ::read(buffer, size): same as readBytes without timeout
    int read(char* buffer, size_t size)
    {
        return uart_read(_uart, buffer, size);
    }
    int read(uint8_t* buffer, size_t size) override
    {
        return uart_read(_uart, (char*)buffer, size);
    }
    size_t readBytes(char* buffer, size_t size) override;
    size_t readBytes(uint8_t* buffer, size_t size) override
    {
        return readBytes((char*)buffer, size);
    }
    int availableForWrite(void) override
    {
        return static_cast<int>(uart_tx_free(_uart));
    }
    void flush(void) override;
    size_t write(uint8_t c) override
    {
        return uart_write_char(_uart, c);
    }
    size_t write(const uint8_t *buffer, size_t size) override
    {
        return uart_write(_uart, (const char*)buffer, size);
    }
    using Print::write; // Import other write() methods to support things like write(0) properly
    operator bool() const
    {
        return _uart != 0;
    }
    void setDebugOutput(bool);
    bool isTxEnabled(void)
    {
        return uart_tx_enabled(_uart);
    }
    bool isRxEnabled(void)
    {
        return uart_rx_enabled(_uart);
    }
    int baudRate(void)
    {
        return uart_get_baudrate(_uart);
    }

    bool hasOverrun(void)
    {
        return uart_has_overrun(_uart);
    }

    bool hasRxError(void)
    {
        return uart_has_rx_error(_uart);
    }

    void startDetectBaudrate();

    unsigned long testBaudrate();

    unsigned long detectBaudrate(time_t timeoutMillis);

protected:
    int _uart_nr;
    uart_t* _uart = nullptr;
    size_t _rx_size;
};

extern HardwareSerial Serial;
extern HardwareSerial Serial1;

extern void serialEventRun(void) __attribute__((weak));

#endif