Diff: main.cpp

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+++ b/main.cpp	Thu May 19 08:50:56 2016 +0000
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+/**
+*   @file     main.cpp
+*   @brief    Main file for the CN0357-example project
+*   @author   Analog Devices Inc.
+*
+* For support please go to:
+* Github: https://github.com/analogdevicesinc/mbed-adi
+* Support: https://ez.analog.com/community/linux-device-drivers/microcontroller-no-os-drivers
+* Product: www.analog.com/EVAL-CN0357-ARDZ
+* More: https://wiki.analog.com/resources/tools-software/mbed-drivers-all
+
+********************************************************************************
+* Copyright 2016(c) Analog Devices, Inc.
+*
+* All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are met:
+*  - Redistributions of source code must retain the above copyright
+*    notice, this list of conditions and the following disclaimer.
+*  - Redistributions in binary form must reproduce the above copyright
+*    notice, this list of conditions and the following disclaimer in
+*    the documentation and/or other materials provided with the
+*    distribution.
+*  - Neither the name of Analog Devices, Inc. nor the names of its
+*    contributors may be used to endorse or promote products derived
+*    from this software without specific prior written permission.
+*  - The use of this software may or may not infringe the patent rights
+*    of one or more patent holders.  This license does not release you
+*    from the requirement that you obtain separate licenses from these
+*    patent holders to use this software.
+*  - Use of the software either in source or binary form, must be run
+*    on or directly connected to an Analog Devices Inc. component.
+*
+* THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
+* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
+* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+* IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
+* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+* LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
+* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*
+********************************************************************************/
+#include "mbed.h"
+#include "CN0357.h"
+
+/** @mainpage
+ * CN0357 single-supply, low noise, portable gas detector circuit using an
+ * electrochemical sensor. The Alphasense CO-AX carbon monoxide sensor is used
+ * in this example. Electrochemical sensors offer several advantages for
+ * instruments that detect or measure the concentration of many toxic gases.
+ * Most sensors are gas specific and have usable resolutions under one part per
+ * million (ppm) of gas concentration.
+ *
+ * EVAL-CN0357 example program for MBED platforms. To achieve connection between
+ * the shield and the ST Nucleo, the following connections need to be made:
+ *
+ * - ICSP pin 1 -> pin 12 of the Arduino header
+ * - ICSP pin 3 -> pin 13 of the Arduino header
+ * - ICSP pin 4 -> pin 11 of the Arduino header
+ * - if VIN is not supplied, 5V to VIN
+ *
+ * @page CN0357 CN0357 Analog Devices wiki page
+ * @brief link->
+ * https://wiki.analog.com/resources/eval/user-guides/eval-adicup360/hardware/cn0357
+ * @page AD7790 AD7790 datasheet
+ * @brief link ->
+ * http://www.analog.com/media/en/technical-documentation/data-sheets/AD7790.pdf
+ * @page AD5270 AD5270 datasheet
+ * @brief link ->
+ * http://www.analog.com/media/en/technical-documentation/data-sheets/AD5270_5271.pdf
+ *
+ */
+const float SENSOR_RANGE = 2000; ///< gas sensor range in PPM
+const float SENSOR_SENSITIVITY = (65 * 0.000000001/*pow(10, -9)*/); ///< gas sensor sensitivity in A/ppm - 65 nA/ppm
+
+Serial pc(USBTX, USBRX); ///< Serial interface to the pc
+
+/**
+ @brief Displays CN0357 circuit readings and data to the UART
+
+ @param ui16Data - ADC data register value to be displayed
+ @param fData1   - ADC input voltage reading to be displayed
+ @param fdata2   - Gas Concentration reading to be displayed
+
+ **/
+void display_data(uint8_t ui8Status_Reg, uint16_t ui16Data, float fData1, float fdata2)
+{
+    pc.printf("\r\nStatus Register value: 0x%x", ui8Status_Reg);
+    pc.printf("\r\nADC Data Register Value = %#08x", ui16Data); /** Send valid ADC data register value*/
+    pc.printf("\r\nADC Input Voltage input = %f V", fData1); /** Send valid voltage input value */
+    pc.printf("\r\nGas Concentration = %f PPM", fdata2); /** Send valid gas concentration value */
+
+    pc.printf("\r\n");
+}
+
+/**
+ * Project entry-point - initializes the CN0357 shield, reads the data when the ADC is ready and outputs the sensor
+ * value in PPM
+ */
+
+#define SINGLE_CONVERSION
+//#define CONTINOUS_CONVERSION
+
+int main()
+{
+    /* Main variables */
+    CN0357 cn0357;
+    uint8_t ui8Status_Reg = 0;
+#ifdef SINGLE_CONVERSION
+    cn0357.init(SENSOR_RANGE, SENSOR_SENSITIVITY);
+#elif defined CONTINOUS_CONVERSION
+    cn0357.init(SENSOR_RANGE, SENSOR_SENSITIVITY, CN0357::INTERNAL_AD7790, 0x00, 0x07);
+#else
+#error define SINGLE_CONVERSION or CONTINOUS_CONVERSION, but not both
+#endif
+
+
+    /* Infinite loop */
+    while (1) {
+        wait_ms(1000);
+#ifdef CONTINOUS_CONVERSION
+        ui8Status_Reg = cn0357.read_adc_status(); //  Read ADC Status Register        //
+
+        if (ui8Status_Reg != 0x08) { //  Checks if ADC data is available
+            pc.printf("\r\nStatus Register value: 0x%x", ui8Status_Reg);
+        } else
+#endif
+        {
+            uint16_t ui16Adcdata = cn0357.read_sensor();
+            float fAdcVoltage    = cn0357.data_to_voltage(ui16Adcdata); //  Convert ADC data to voltage
+            float fConcentration = cn0357.calc_ppm(fAdcVoltage); //  Convert voltage to Gas concentration
+            display_data(ui8Status_Reg, ui16Adcdata, fAdcVoltage, fConcentration); //  Display data thru UART
+        }
+    }
+
+
+    /* Infinite loop, never returns. */
+}