BB_DS18B20.hpp

// (c) Copywright  Nov 24, 2023  Daniel Perron
//  version using gpiod library
//  DS18B20Pi5Scan.c
//  read from Raspberry Pi 5  GPIO  A DS18B20 sensor by bitbanging 1 wire protocol
//  from user space

#include <cstdint>
#include <string>


class BB_DS18B20 {
  public:
    BB_DS18B20 (struct gpiod_line * _gpioline);
    ~BB_DS18B20();
    int  ReadScratchPad (void);
    void WriteScratchPad (uint8_t TH, uint8_t TL, uint8_t config);
    void  CopyScratchPad (void);
    void ChangeSensorsResolution (int resolution);
    int GlobalStartConversion (void);
    void ScanForSensor();
    void SelectSensor (unsigned  long long ID);
    int  SearchSensor (unsigned long long * ID, int * LastBitChange);
    int ReadSensor (unsigned long long ID);

    int ScanCount;
    const int SCAN_MAX=64;
    unsigned long long *ScanID;
    double temperature;
    int resolution;
    std::string  IdToString (unsigned long long id);
  private:
    struct gpiod_line * gpioline;
    void clrBit (void);
    void setBit (void);
    int  readBit (void);
    void Delay1us (void);
    void DelayNanosecondsNoSleep (int delay_ns);
    void DelayMicrosecondsNoSleep (int delay_us);
    int DoReset (void);
    void WriteByte (uint8_t value);
    void WriteBit (uint8_t value);
    uint8_t ReadBit (void);
    uint8_t ReadByte (void);
    uint8_t CalcCRC (uint8_t * data, int  byteSize);
    uint8_t IDGetBit (unsigned long long *llvalue, uint8_t  bit);
    unsigned long long   IDSetBit (unsigned long long *llvalue,uint8_t bit,
                                   uint8_t newValue);

    const uint8_t DS18B20_SKIP_ROM=0xCC;
    const uint8_t DS18B20_CONVERT_T=0x44;
    const uint8_t DS18B20_MATCH_ROM=0x55;
    const uint8_t DS18B20_SEARCH_ROM=0XF0;
    const uint8_t DS18B20_READ_SCRATCHPAD=0xBE;
    const uint8_t DS18B20_WRITE_SCRATCHPAD=0x4E;
    const uint8_t DS18B20_COPY_SCRATCHPAD=0x48;
    uint8_t	ScratchPad[9];
    int           WaitTime;

  };