text: /*
      This program is free software: you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation, either version 3 of the License, or
      (at your option) any later version.
  
      This program 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 General Public License for more details.
  
      You should have received a copy of the GNU General Public License
      along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
  #include <esp_system.h>
  
  #ifndef DRVDS18B20_H_  
  #define DRVDS18B20_H_
  
  #define noInterrupts() portMUX_TYPE mux = portMUX_INITIALIZER_UNLOCKED;taskENTER_CRITICAL(&mux)
  #define interrupts() taskEXIT_CRITICAL(&mux)
  
  #define DEVICE_DISCONNECTED_C -127
  #define DEVICE_DISCONNECTED_F -196.6
  #define DEVICE_DISCONNECTED_RAW -7040
  #define constrain(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt)))
  #define pgm_read_byte(addr)   (*(const unsigned char *)(addr))
  
  typedef uint8_t DeviceAddress[8];
  typedef uint8_t ScratchPad[9];
  
  // Dow-CRC using polynomial X^8 + X^5 + X^4 + X^0
  // Tiny 2x16 entry CRC table created by Arjen Lentz
  // See http://lentz.com.au/blog/calculating-crc-with-a-tiny-32-entry-lookup-table
  static const uint8_t dscrc2x16_table[] = {
  	0x00, 0x5E, 0xBC, 0xE2, 0x61, 0x3F, 0xDD, 0x83,
  	0xC2, 0x9C, 0x7E, 0x20, 0xA3, 0xFD, 0x1F, 0x41,
  	0x00, 0x9D, 0x23, 0xBE, 0x46, 0xDB, 0x65, 0xF8,
  	0x8C, 0x11, 0xAF, 0x32, 0xCA, 0x57, 0xE9, 0x74
  };
  
  void ds18b20_init(int GPIO);
  
  #define ds18b20_send ds18b20_write
  #define ds18b20_send_byte ds18b20_write_byte
  #define ds18b20_RST_PULSE ds18b20_reset
  
  void ds18b20_write(char bit);
  unsigned char ds18b20_read(void);
  void ds18b20_write_byte(char data);
  unsigned char ds18b20_read_byte(void);
  unsigned char ds18b20_reset(void);
  
  bool ds18b20_setResolution(const DeviceAddress tempSensorAddresses[], int numAddresses, uint8_t newResolution);
  bool ds18b20_isConnected(const DeviceAddress *deviceAddress, uint8_t *scratchPad);
  void ds18b20_writeScratchPad(const DeviceAddress *deviceAddress, const uint8_t *scratchPad);
  bool ds18b20_readScratchPad(const DeviceAddress *deviceAddress, uint8_t *scratchPad);
  void ds18b20_select(const DeviceAddress *address);
  uint8_t ds18b20_crc8(const uint8_t *addr, uint8_t len);
  bool ds18b20_isAllZeros(const uint8_t * const scratchPad);
  bool isConversionComplete();
  uint16_t millisToWaitForConversion();
  
  void ds18b20_requestTemperatures();
  float ds18b20_getTempF(const DeviceAddress *deviceAddress);
  float ds18b20_getTempC(const DeviceAddress *deviceAddress);
  int16_t calculateTemperature(const DeviceAddress *deviceAddress, uint8_t* scratchPad);
  float ds18b20_get_temp(void);
  
  void reset_search();
  bool search(uint8_t *newAddr, bool search_mode);
  
  #endif
  