Diff: libraries/cn0216/CN0216.cpp

Revision:

24:dae7123d432a

Parent:

23:174dd32fa661

Child:

25:b9e3756c9cbb

Child:

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Child:

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--- a/libraries/cn0216/CN0216.cpp	Tue May 17 18:37:29 2016 +0300
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,161 +0,0 @@
-/**
-*   @file     cn0216.cpp
-*   @brief    Source file for CN0216
-*   @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-CN0216-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 "AD7791.h"
-#include "CN0216.h"
-extern Serial pc;
-
-/**
- * CN0216 constructor
- * @param CSAD7791 - Chipselect of the AD7791
- * @param MOSI - MOSI line of the SPI bus
- * @param MISO - MISO line of the SPI bus
- * @param SCK - SCK line of the SPI bus
- */
-CN0216::CN0216(PinName CSAD7791, PinName MOSI, PinName MISO, PinName SCK) : ad7791(1.2, CSAD7791, MOSI, MISO, SCK)
-{
-    _cal_weight = 0;
-    _zero_scale_value = 0;
-    _full_scale_value = 0;
-    _weight_units_per_bit = 0;
-}
-
-/**
- * Initializes the mode and filter values of the AD7791 and sets the weight to be used in calibration
- * @param cal_weight - weight used in calibration
- * @param mode_val - value of the mode register
- * @param filter_val - value of the filter register
- */
-void CN0216::init(float cal_weight, uint8_t mode_val, uint8_t filter_val)
-{
-    _cal_weight = cal_weight;
-    ad7791.frequency(500000);
-    wait_ms(50);
-    ad7791.reset();
-    wait_ms(50);
-    ad7791.write_mode_reg(mode_val);
-    wait_us(2);
-    ad7791.write_filter_reg(filter_val);
-    wait_ms(50);
-}
-
-/**
- * Calibrates the CN0216 weigh scale
- * @param cal - calibration step.
- * Step CN0216::ZERO_SCALE_CALIBRATION will take CN0216::_NUMBER_OF_SAMPLES samples and use the minimum as value for the zero scale
- * Step CN0216::FULL_SCALE_CALIBRATION will take CN0216::_NUMBER_OF_SAMPLES samples and use the average as value for the full scale
- * Step COMPUTE_UNITS_PER_BIT will compute the grams per bit used in weight computation.
- */
-void CN0216::calibrate(CalibrationStep_t cal)
-{
-    uint64_t sum = 0;
-    uint32_t min = 0xFFFFFFFF;
-    uint32_t sample = 0;
-    switch(cal) {
-        case ZERO_SCALE_CALIBRATION:
-        case FULL_SCALE_CALIBRATION:
-            for(int i = 0; i < _NUMBER_OF_SAMPLES; i++) {
-                sample = ad7791.read_u32();
-                min = (min < sample) ? min : sample;
-                sum += ad7791.read_u32();
-                wait_us(5);
-            }
-            if(cal == ZERO_SCALE_CALIBRATION) {
-                // pc.printf("ZERO SCALE VALUE = %x",sum);
-                _zero_scale_value = min;
-            } else {
-                //  pc.printf("FULL SCALE VALUE = %x",sum);
-                sum = sum / _NUMBER_OF_SAMPLES;
-                _full_scale_value = sum;
-            }
-            break;
-
-        case COMPUTE_UNITS_PER_BIT:
-            _weight_units_per_bit = _cal_weight / (static_cast<float> (_full_scale_value - _zero_scale_value));  /* Calculate number of grams per LSB */
-            // pc.printf("GRAMS/LSB = %f", _grams_per_bit);
-            break;
-        default:
-            break;
-    }
-
-}
-
-/**
- * Computes the weight based on the formula
- * weight = (data - zeroscale) * weight_units_per_bit
- * @param data read from the ADC
- * @return weight based on data
- */
-float CN0216::compute_weight(uint32_t data)
-{
-//	pc.printf("\r\nFULL_SCALE_VALUE = %x\r\nZERO_SCALE_VALUE = %x\r\nDATA READ = %x\r\nGRAMS/LSB = %f\r\n",_full_scale_value,data,_zero_scale_value,_grams_per_bit);
-    if(data < _zero_scale_value)
-        data = _zero_scale_value; // clamp data to 0
-    float weight_in_grams =  (static_cast<float>((data) - _zero_scale_value)) * _weight_units_per_bit;         /* Calculate weight */
-    return weight_in_grams;
-}
-
-/**
- * Reads the AD7791
- * @return value read by the ADC
- */
-uint32_t CN0216::read_u32()
-{
-    return ad7791.read_u32();
-}
-
-/**
- * Reads the ADC and computes the weight based on the formula described above.
- * @return weight
- */
-float CN0216::read_weight()
-{
-    uint32_t weight =  read_u32();
-    return compute_weight(weight);
-}
-