SerialUART.h

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#pragma once
 
#include "api/HardwareSerial.h"
#include "api/RingBuffer.h"
#include "hardware/uart.h"
#include "pico/critical_section.h"

class SerialUARTClass : public arduino::HardwareSerial {
public:
    SerialUARTClass(uart_inst_t* uart, pin_size_t tx_pin, pin_size_t rx_pin)
        : uart_(uart), tx_pin_(tx_pin), rx_pin_(rx_pin) {}

    void begin(unsigned long baud) override { begin(baud, SERIAL_8N1); }

    void begin(unsigned long baud, uint16_t config) override;

    void end() override;

    int available() override;

    int peek() override;

    int read() override;

    void flush() override;

    size_t write(uint8_t c) override;
    using arduino::Print::write;

    operator bool() override { return started_; }

    void handleRxInterrupt();
 
private:
    uart_inst_t* uart_;
    pin_size_t tx_pin_;
    pin_size_t rx_pin_;
    bool started_ = false;
    arduino::RingBufferN<256> rx_buffer_;
    critical_section_t rx_lock_ = {};  // guards rx_buffer_; set up by the first begin()
};

extern SerialUARTClass Serial1;
extern SerialUARTClass Serial2;