#pragma once

#include "stm32f1xx_hal.h"
#include "FreeRTOS.h"
#include "semphr.h"
#include <cstdint>

class MHZ19C
{
public:

    explicit MHZ19C(UART_HandleTypeDef* huart);

    bool ReadCO2(uint16_t& ppm);

    void CalibrateZero();

    SemaphoreHandle_t GetRxSemaphore()
    {
        return rxDoneSem;
    }

private:

    UART_HandleTypeDef* uart;

    uint8_t txFrame[9];
    uint8_t rxFrame[9];

    SemaphoreHandle_t rxDoneSem;

    void BuildReadFrame();

    uint8_t Checksum(uint8_t* data);
};