CN0397.h

00001 /**
00002 *   @file     CN0397.cpp
00003 *   @brief    Header file for the CN0397
00004 *   @author   Analog Devices Inc.
00005 *
00006 * For support please go to:
00007 * Github: https://github.com/analogdevicesinc/mbed-adi
00008 * Support: https://ez.analog.com/community/linux-device-drivers/microcontroller-no-os-drivers
00009 * Product: www.analog.com/EVAL-CN0397-ARDZ
00010 * More: https://wiki.analog.com/resources/tools-software/mbed-drivers-all
00011 
00012 ********************************************************************************
00013 * Copyright 2016(c) Analog Devices, Inc.
00014 *
00015 * All rights reserved.
00016 *
00017 * Redistribution and use in source and binary forms, with or without
00018 * modification, are permitted provided that the following conditions are met:
00019 *  - Redistributions of source code must retain the above copyright
00020 *    notice, this list of conditions and the following disclaimer.
00021 *  - Redistributions in binary form must reproduce the above copyright
00022 *    notice, this list of conditions and the following disclaimer in
00023 *    the documentation and/or other materials provided with the
00024 *    distribution.
00025 *  - Neither the name of Analog Devices, Inc. nor the names of its
00026 *    contributors may be used to endorse or promote products derived
00027 *    from this software without specific prior written permission.
00028 *  - The use of this software may or may not infringe the patent rights
00029 *    of one or more patent holders.  This license does not release you
00030 *    from the requirement that you obtain separate licenses from these
00031 *    patent holders to use this software.
00032 *  - Use of the software either in source or binary form, must be run
00033 *    on or directly connected to an Analog Devices Inc. component.
00034 *
00035 * THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
00036 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
00037 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
00038 * IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
00039 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00040 * LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
00041 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00042 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00043 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00044 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00045 *
00046 ********************************************************************************/
00047 
00048 #ifndef CN0397_H_
00049 #define CN0397_H_
00050 
00051 #include <stdio.h>
00052 #include <string.h>
00053 #include "AD7798.h"
00054 
00055 #define REGISTERS_VALUES     3
00056 #define CONVERSION_DATA      4
00057 
00058 #define V_REF                3150.0    // [mV]
00059 #define _2_16                65535.0   // 2^16
00060 
00061 
00062 /* Available settings:
00063  * AD7798_CH_AIN1P_AIN1M - select channel 1
00064  * AD7798_CH_AIN2P_AIN2M - select channel 2
00065  * AD7798_CH_AIN3P_AIN3M - select channel 3
00066  */
00067 #define ADC_CHANNEL   AD7798_CH_AIN2P_AIN2M
00068 
00069 /* Available settings:
00070  *  AD7798_GAIN_1, AD7798_GAIN_2,
00071  *  AD7798_GAIN_4, AD7798_GAIN_8,
00072  *  AD7798_GAIN_16, AD7798_GAIN_32,
00073  *  AD7798_GAIN_64, AD7798_GAIN_128
00074  */
00075 #define ADC_GAIN      AD7798_GAIN_1
00076 /* Available settings:
00077  * Check available value from datasheet
00078  */
00079 #define ADC_SPS        0x05  /*50SPS*/
00080 
00081 
00082 /* Available settings:
00083  * How often to display output values on terminal -> msec
00084  */
00085 #define DISPLAY_REFRESH        1000   /*[msec]*/
00086 
00087 #define CHANNELS  3
00088 
00089 
00090 #define USE_CALIBRATION      /* Select if you want to use system zero-scale calibration before reading the system data*/
00091 /**
00092  * Helper function used to flush the serial interface
00093  */
00094 void flush_serial();
00095 
00096 /**
00097  * @brief The CN0397 shield class
00098  */
00099 class CN0397
00100 {
00101 public:
00102     /**
00103      * @brief The CN0397 class constructor
00104      */
00105     CN0397(PinName cs);
00106     /**
00107      * @brief Initialization method of the class. Initializes the AD7798 and initiates calibration if needed
00108      */
00109     void init(void);
00110 
00111     /**
00112      * @brief Displays data on the serial interface
00113      */
00114     void display_data(void);
00115 
00116     /**
00117      * @brief Converts ADC counts to voltage
00118      * @param adcValue - ADC counts
00119      * @param voltage - computed voltage
00120      */
00121     void data_to_voltage(uint16_t adcValue, float *voltage);
00122 
00123     /**
00124      * @brief Computes light intensity of the channel
00125      * @param channel - channel to be converted
00126      * @param adcValue - ADC counts
00127      * @param intensity - computed light intensity
00128      */
00129     void calc_light_intensity(uint8_t channel, uint16_t adcValue, float *intensity);
00130 
00131     /**
00132      * @brief Computes light concentration from light intensity
00133      * @param channel - channel to be converted
00134      * @param intensity - light intensity
00135      * @param conc - computed light concentration
00136      */
00137     void calc_light_concentration(uint8_t channel, float intensity, float *conc);
00138 
00139     /**
00140      * @brief Reads the ADC channels and computes intensity and concentration
00141      */
00142     void set_app_data(void);
00143 
00144     /**
00145      * @brief Calibrates the channel
00146      * @param channel - channel to be calibrated
00147      */
00148     void calibration(uint8_t channel);
00149 
00150     /**
00151      * @brief Instance of the AD7798
00152      */
00153     AD7798 ad7798;
00154 private:
00155 
00156     uint8_t statusReg, idReg, ioReg, gainAdc;
00157     uint16_t modeReg, configReg, offsetReg, fullscaleReg, dataReg;
00158     uint16_t adcValue[3];
00159     float voltageValue[3], intensityValue[3], lightConcentration[3];
00160     const uint8_t Channels[3] = { 1, 0, 2};
00161     const char colour[3][6] = {
00162         "RED", "GREEN", "BLUE",
00163     };
00164 
00165     const uint8_t ColorPrint[3] = { 31, 32, 34 };
00166     const uint8_t Gain[8] = { 1, 2, 4, 8, 16, 32, 64, 128};
00167     const float Lux_LSB[3] = {2.122, 2.124, 2.113};
00168     const float Optimal_Levels[3] = {26909.0, 8880.0, 26909.0};
00169 
00170 };
00171 
00172 #endif /* CN0397_H_ */
00173