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/* ****************************************************************
*
* Copyright 2017 Samsung Electronics All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************/
#ifndef __CO2_SENSOR_H__
#define __CO2_SENSOR_H__
/**
* @brief Reads the value from co2 sensor through AD converter(MCP3008).
* @param[in] ch_num The number of channel connected to the co2 detection sensor with AD converter
* @param[out] out_value The vaule of a co2 level
* @return 0 on success, otherwise a negative error value
*
*/
int co2_sensor_read(int ch_num, unsigned int *out_value);
/* release resource */
void co2_sensor_close(void);
/* utility functions */
double co2_sensor_value_to_voltage(unsigned int value);
/* Fallowing functions art Not implemented, please see comments in c source code */
int co2_sensor_set_calibration_values(unsigned int zero_point_v,
unsigned int second_point_ppm, unsigned int second_point_v);
unsigned int co2_sensor_voltage_to_ppm(double voltage);
unsigned int co2_sensor_value_to_ppm(unsigned int value);
#endif /* __CO2_SENSOR_H__ */
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