DS18B20.cpp

#include "OneWireHub.h"
#include "DS18B20.h"

//#define DEBUG_DS18B20

//=================== DS18S20 ==========================================
DS18B20::DS18B20(byte ID1, byte ID2, byte ID3, byte ID4, byte ID5, byte ID6, byte ID7): OneWireItem(ID1, ID2, ID3, ID4, ID5, ID6, ID7){
  this->scratchpad[0] = 0xB4; // TLSB
  this->scratchpad[1] = 0x09; // TMSB
  this->scratchpad[2] = 0x4B; // THRE
  this->scratchpad[3] = 0x46; // TLRE
  this->scratchpad[4] = 0x1F; // Conf
  this->scratchpad[5] = 0xFF; // 0xFF
  this->scratchpad[6] = 0x00; // Rese
  this->scratchpad[7] = 0x10; // 0x10
  this->scratchpad[8] = 0x00; // CRC
  updateCRC();
}

bool DS18B20::updateCRC(){
  this->scratchpad[8] = crc8(scratchpad, 8);  
}

bool DS18B20::duty(OneWireHub * hub)
{
  uint8_t done = hub->recv();  
  
  switch (done) {

    // CONVERT T
    case 0x44:
      hub->sendBit(1);
      
      #ifdef DEBUG_DS18B20
        Serial.println("DS18B20 : CONVERT T");
      #endif  
      break;

    // WRITE SCRATCHPAD
    case 0x4E:
      #ifdef DEBUG_DS18B20
        Serial.println("DS18B20 : WRITE SCRATCHPAD");
      #endif  
      break;
    
    // READ SCRATCHPAD
    case 0xBE:
      hub->sendData(this->scratchpad, 9);
      if (hub->errno != ONEWIRE_NO_ERROR) return FALSE;      
      
      #ifdef DEBUG_DS18B20
        Serial.println("DS18B20 : READ SCRATCHPAD");
      #endif  
      break;

    // COPY SCRATCHPAD
    case 0x48:  
      #ifdef DEBUG_DS18B20
        Serial.println("DS18B20 : READ SCRATCHPAD");
      #endif  
      break;
      
    // RECALL E2
    case 0xB8:
      hub->sendBit(1);
      
      #ifdef DEBUG_DS18B20
        Serial.println("DS18B20 : RECALL E2");
      #endif  
      break;
      
    // READ POWERSUPPLY
    case 0xB4:
      hub->sendBit(1);
      
      #ifdef DEBUG_DS18B20
        Serial.println("DS18B20 : READ POWERSUPPLY");
      #endif  
      break;

    //  write trim2               0x63
    //  copy trim2                0x64
    //  read trim2                0x68
    //  read trim1                0x93
    //  copy trim1                0x94
    //  write trim1               0x95

    default:    
      #ifdef DEBUG_hint
        Serial.print("DS18B20=");
        Serial.println(done, HEX);
      #endif  
      break;    
  }
  
  return TRUE;
}

void DS18B20::settemp(float temp)
{  
  word ret = 0;
  bool Neg = temp < 0;
  temp = abs(temp);	
  ret = round(floor(temp)) << 4;

  if (Neg){
    ret = ret | 0x8000;
  }
 
  ret = ret | byte(16*((temp - (int)temp) * 100)/100);
  
  this->scratchpad[0] = byte(ret);
  this->scratchpad[1] = byte(ret >> 8);
  updateCRC();
}