Line data    Source code

       1              : /**
       2              :  * @file LM75Node.cpp
       3              :  *
       4              :  * This is part of the DUNE DAQ Software Suite, copyright 2020.
       5              :  * Licensing/copyright details are in the COPYING file that you should have
       6              :  * received with this code.
       7              :  */
       8              : 
       9              : #include "timing/LM75Node.hpp"
      10              : 
      11              : // PDT headers
      12              : #include "ers/ers.hpp"
      13              : #include "timing/toolbox.hpp"
      14              : 
      15              : #include <vector>
      16              : // #include <fstream>
      17              : // #include <sstream>
      18              : 
      19              : namespace dunedaq {
      20              : namespace timing {
      21              : 
      22              : //-----------------------------------------------------------------------------
      23            0 : LM75Node::LM75Node(const I2CMasterNode* i2c_master, uint8_t address) // NOLINT(build/unsigned)
      24            0 :   : I2CSlave(i2c_master, address)
      25            0 : {}
      26              : //-----------------------------------------------------------------------------
      27              : 
      28              : //-----------------------------------------------------------------------------
      29            0 : LM75Node::~LM75Node() {}
      30              : //-----------------------------------------------------------------------------
      31              : 
      32              : //-----------------------------------------------------------------------------
      33              : float
      34            0 : LM75Node::read_temperature() const
      35              : {
      36            0 :   std::vector<uint8_t> temp_bytes = this->read_i2cPrimitive(2); // NOLINT(build/unsigned)
      37            0 :   uint16_t temp_raw = (temp_bytes[1] & 0x80) >> 7;
      38            0 :   temp_raw = temp_raw | (temp_bytes[0] << 1);
      39              : 
      40              :   // 1s padding for negative values
      41            0 :   if (temp_raw & 0x0100)
      42              :   {
      43            0 :     temp_raw = temp_raw | 0xfe00; 
      44              :   }
      45            0 :   int16_t temp = static_cast<int16_t>(temp_raw);
      46              : 
      47            0 :   TLOG_DEBUG(13) << "LM75 temp data - "
      48            0 :   << "raw bytes: 0x" << std::hex << (uint)temp_bytes[0] << ", 0x" << (uint)temp_bytes[1] // NOLINT(build/unsigned)
      49            0 :   << ", combined word: 0x" << temp_raw
      50            0 :   << ", temp [C]: " << temp*0.5;
      51            0 :   return temp*0.5;
      52            0 : }
      53              : //-----------------------------------------------------------------------------
      54              : 
      55              : } // namespace timing
      56              : } // namespace dunedaq