src/W1TemperatureSensor.cc

   1 /*
   2  * W1TemperatureSensor.cc
   3  *
   4  *  Created on: Oct 20, 2010
   5  *      Author: lamikr
   6  */
   7 #include <fstream>
   8 #include <iostream>
   9 #include <sstream>
  10 #include <iomanip>
  11
  12 #include <plp/log.h>
  13
  14 #include "W1TemperatureSensor.hh"
  15
  16 using namespace std;
  17 using namespace w1;
  18
  19 #define CONST_UNIT_CELCIUS      "C"
  20
  21 template <class NumberDataType>
  22 bool string_to_number(NumberDataType& result,
  23                  const std::string& string_param,
  24                  std::ios_base& (*format)(std::ios_base&))
  25 {
  26         std::istringstream iss(string_param);
  27         return !(iss >> format >> result).fail();
  28 }
  29
  30 double convert_w1_temperature_to_celcius(string raw_value,
  31                                 int *err_flg) {
  32         bool    suc_flg;
  33         double  dbl_val;
  34
  35         dbl_val = 0;
  36         suc_flg = string_to_number<double>(dbl_val, raw_value, dec);
  37         if (suc_flg == true) {
  38                 dbl_val         = dbl_val / 1000;
  39                 *err_flg        = 0;
  40 /*
  41                 std::ostringstream out;
  42                 out << fixed << setprecision(3) << dbl_val;
  43                 ret_val = out.str();
  44 */
  45         }
  46         else {
  47                 log_error("Failed to convert temperature %s to celsius value", raw_value.c_str());
  48                 *err_flg        = 1;
  49         }
  50         return dbl_val;
  51 }
  52
  53 W1TemperatureSensor::W1TemperatureSensor(string device_id_param,
  54                 string device_type_param,
  55                 dirent *direntry_param): W1Device(device_id_param, device_type_param, direntry_param) {
  56         ifstream ifs(slave_file.c_str());
  57         if (ifs.is_open() == false) {
  58                 log_error("%s: %s failed to read data from file: %s\n", id.c_str(), get_type().c_str(), slave_file.c_str());
  59                 log_error("Verify that you have w1_therm kernel module loaded.\n");
  60                 ifs.close();
  61         }
  62 }
  63
  64 W1TemperatureSensor::~W1TemperatureSensor() {
  65         log_debug("W1TemperatureSensor destructor\n");
  66 }
  67
  68 vector<double> *W1TemperatureSensor::get_raw_data() {
  69         vector<double>  *ret_val;
  70         string          tmp_str;
  71         string          val_str;
  72         double          val_dbl;
  73         int             pos;
  74         int             b_cnt;
  75         int             err_flg;
  76
  77         ret_val = NULL;
  78         err_flg = 0;
  79         ifstream ifs(slave_file.c_str());
  80         if (ifs.is_open() == true) {
  81                 while(getline(ifs, tmp_str)) {
  82                         if (tmp_str.empty() == false) {
  83                                 val_str = tmp_str;
  84                         }
  85                 }
  86                 ifs.close();
  87                 b_cnt   = val_str.length();
  88                 if (b_cnt > 0) {
  89                         pos     = val_str.find("t=");
  90                         if ((pos >= 0) &&
  91                             ((pos + 2) < b_cnt)) {
  92                                 val_str = val_str.substr(pos + 2);
  93                                 val_dbl = convert_w1_temperature_to_celcius(val_str, &err_flg);
  94                                 if (err_flg == 0) {
  95                                         ret_val = new vector<double>();
  96                                         ret_val->push_back(val_dbl);
  97                                 }
  98                         }
  99                 }
 100         }
 101         return ret_val;
 102 }
 103
 104 string W1TemperatureSensor::get_unit() {
 105         return CONST_UNIT_CELCIUS;
 106 }
 107
 108 unsigned int W1TemperatureSensor::get_data_decimal_precision() {
 109         return 3;
 110 }