Analog Devices / mbed-drivers

A collection of Analog Devices drivers for the mbed platform

For additional information check out the mbed page of the Analog Devices wiki: https://wiki.analog.com/resources/tools-software/mbed-drivers-all

libraries/cn0216/CN0216.cpp@13:66c8e4ce4ff1, 2016-04-29 (annotated)

Committer:
Adrian Suciu
Date:
Fri Apr 29 16:19:00 2016 +0300
Revision:
13:66c8e4ce4ff1
Child:
17:b8356808e8ad
Added driver for AD7791 and example for CN0216

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Adrian Suciu 13:66c8e4ce4ff1 1 /**
Adrian Suciu 13:66c8e4ce4ff1 2 * @file cn0216.cpp
Adrian Suciu 13:66c8e4ce4ff1 3 * @brief Source file for CN0216
Adrian Suciu 13:66c8e4ce4ff1 4 * @author Analog Devices Inc.
Adrian Suciu 13:66c8e4ce4ff1 5 *
Adrian Suciu 13:66c8e4ce4ff1 6 * For support please go to:
Adrian Suciu 13:66c8e4ce4ff1 7 * Github: https://github.com/analogdevicesinc/mbed-adi
Adrian Suciu 13:66c8e4ce4ff1 8 * Support: https://ez.analog.com/community/linux-device-drivers/microcontroller-no-os-drivers
Adrian Suciu 13:66c8e4ce4ff1 9 * Product: www.analog.com/EVAL-CN0216-ARDZ
Adrian Suciu 13:66c8e4ce4ff1 10 * More: https://wiki.analog.com/resources/tools-software/mbed-drivers-all
Adrian Suciu 13:66c8e4ce4ff1 11
Adrian Suciu 13:66c8e4ce4ff1 12 ********************************************************************************
Adrian Suciu 13:66c8e4ce4ff1 13 * Copyright 2016(c) Analog Devices, Inc.
Adrian Suciu 13:66c8e4ce4ff1 14 *
Adrian Suciu 13:66c8e4ce4ff1 15 * All rights reserved.
Adrian Suciu 13:66c8e4ce4ff1 16 *
Adrian Suciu 13:66c8e4ce4ff1 17 * Redistribution and use in source and binary forms, with or without
Adrian Suciu 13:66c8e4ce4ff1 18 * modification, are permitted provided that the following conditions are met:
Adrian Suciu 13:66c8e4ce4ff1 19 * - Redistributions of source code must retain the above copyright
Adrian Suciu 13:66c8e4ce4ff1 20 * notice, this list of conditions and the following disclaimer.
Adrian Suciu 13:66c8e4ce4ff1 21 * - Redistributions in binary form must reproduce the above copyright
Adrian Suciu 13:66c8e4ce4ff1 22 * notice, this list of conditions and the following disclaimer in
Adrian Suciu 13:66c8e4ce4ff1 23 * the documentation and/or other materials provided with the
Adrian Suciu 13:66c8e4ce4ff1 24 * distribution.
Adrian Suciu 13:66c8e4ce4ff1 25 * - Neither the name of Analog Devices, Inc. nor the names of its
Adrian Suciu 13:66c8e4ce4ff1 26 * contributors may be used to endorse or promote products derived
Adrian Suciu 13:66c8e4ce4ff1 27 * from this software without specific prior written permission.
Adrian Suciu 13:66c8e4ce4ff1 28 * - The use of this software may or may not infringe the patent rights
Adrian Suciu 13:66c8e4ce4ff1 29 * of one or more patent holders. This license does not release you
Adrian Suciu 13:66c8e4ce4ff1 30 * from the requirement that you obtain separate licenses from these
Adrian Suciu 13:66c8e4ce4ff1 31 * patent holders to use this software.
Adrian Suciu 13:66c8e4ce4ff1 32 * - Use of the software either in source or binary form, must be run
Adrian Suciu 13:66c8e4ce4ff1 33 * on or directly connected to an Analog Devices Inc. component.
Adrian Suciu 13:66c8e4ce4ff1 34 *
Adrian Suciu 13:66c8e4ce4ff1 35 * THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
Adrian Suciu 13:66c8e4ce4ff1 36 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
Adrian Suciu 13:66c8e4ce4ff1 37 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
Adrian Suciu 13:66c8e4ce4ff1 38 * IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
Adrian Suciu 13:66c8e4ce4ff1 39 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
Adrian Suciu 13:66c8e4ce4ff1 40 * LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
Adrian Suciu 13:66c8e4ce4ff1 41 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
Adrian Suciu 13:66c8e4ce4ff1 42 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
Adrian Suciu 13:66c8e4ce4ff1 43 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
Adrian Suciu 13:66c8e4ce4ff1 44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Adrian Suciu 13:66c8e4ce4ff1 45 *
Adrian Suciu 13:66c8e4ce4ff1 46 ********************************************************************************/
Adrian Suciu 13:66c8e4ce4ff1 47
Adrian Suciu 13:66c8e4ce4ff1 48 #include "mbed.h"
Adrian Suciu 13:66c8e4ce4ff1 49 #include "AD7791.h"
Adrian Suciu 13:66c8e4ce4ff1 50 #include "CN0216.h"
Adrian Suciu 13:66c8e4ce4ff1 51 extern Serial pc;
Adrian Suciu 13:66c8e4ce4ff1 52
Adrian Suciu 13:66c8e4ce4ff1 53 CN0216::CN0216(PinName CSAD7791, PinName MOSI, PinName MISO, PinName SCK) : ad7791(1.2, CSAD7791, MOSI, MISO, SCK)
Adrian Suciu 13:66c8e4ce4ff1 54 {
Adrian Suciu 13:66c8e4ce4ff1 55 _cal_weight = 0;
Adrian Suciu 13:66c8e4ce4ff1 56 _zero_scale_value = 0;
Adrian Suciu 13:66c8e4ce4ff1 57 _full_scale_value = 0;
Adrian Suciu 13:66c8e4ce4ff1 58 _grams_per_bit = 0;
Adrian Suciu 13:66c8e4ce4ff1 59
Adrian Suciu 13:66c8e4ce4ff1 60 }
Adrian Suciu 13:66c8e4ce4ff1 61 void CN0216::init(float cal_weight, uint8_t mode_val, uint8_t filter_val)
Adrian Suciu 13:66c8e4ce4ff1 62 {
Adrian Suciu 13:66c8e4ce4ff1 63 _cal_weight = cal_weight;
Adrian Suciu 13:66c8e4ce4ff1 64 ad7791.frequency(500000);
Adrian Suciu 13:66c8e4ce4ff1 65 wait_ms(50);
Adrian Suciu 13:66c8e4ce4ff1 66 ad7791.reset();
Adrian Suciu 13:66c8e4ce4ff1 67 wait_ms(50);
Adrian Suciu 13:66c8e4ce4ff1 68 ad7791.write_mode_reg(mode_val);
Adrian Suciu 13:66c8e4ce4ff1 69 wait_us(2);
Adrian Suciu 13:66c8e4ce4ff1 70 ad7791.write_filter_reg(filter_val);
Adrian Suciu 13:66c8e4ce4ff1 71 wait_ms(50);
Adrian Suciu 13:66c8e4ce4ff1 72 }
Adrian Suciu 13:66c8e4ce4ff1 73
Adrian Suciu 13:66c8e4ce4ff1 74 void CN0216::calibrate(CalibrationStep_t cal)
Adrian Suciu 13:66c8e4ce4ff1 75 {
Adrian Suciu 13:66c8e4ce4ff1 76 uint64_t sum = 0;
Adrian Suciu 13:66c8e4ce4ff1 77 uint32_t min = 0xFFFFFFFF;
Adrian Suciu 13:66c8e4ce4ff1 78 uint32_t sample = 0;
Adrian Suciu 13:66c8e4ce4ff1 79 switch(cal)
Adrian Suciu 13:66c8e4ce4ff1 80 {
Adrian Suciu 13:66c8e4ce4ff1 81 case ZERO_SCALE_CALIBRATION:
Adrian Suciu 13:66c8e4ce4ff1 82 case FULL_SCALE_CALIBRATION:
Adrian Suciu 13:66c8e4ce4ff1 83 for(int i = 0;i < _NUMBER_OF_SAMPLES;i++)
Adrian Suciu 13:66c8e4ce4ff1 84 {
Adrian Suciu 13:66c8e4ce4ff1 85 sample = ad7791.read_u32();
Adrian Suciu 13:66c8e4ce4ff1 86 min = (min<sample) ? min : sample;
Adrian Suciu 13:66c8e4ce4ff1 87 sum += ad7791.read_u32();
Adrian Suciu 13:66c8e4ce4ff1 88 wait_us(5);
Adrian Suciu 13:66c8e4ce4ff1 89 }
Adrian Suciu 13:66c8e4ce4ff1 90 if(cal == ZERO_SCALE_CALIBRATION)
Adrian Suciu 13:66c8e4ce4ff1 91 {
Adrian Suciu 13:66c8e4ce4ff1 92 // pc.printf("ZERO SCALE VALUE = %x",sum);
Adrian Suciu 13:66c8e4ce4ff1 93 _zero_scale_value = min;
Adrian Suciu 13:66c8e4ce4ff1 94 }
Adrian Suciu 13:66c8e4ce4ff1 95 else
Adrian Suciu 13:66c8e4ce4ff1 96 {
Adrian Suciu 13:66c8e4ce4ff1 97 // pc.printf("FULL SCALE VALUE = %x",sum);
Adrian Suciu 13:66c8e4ce4ff1 98 sum = sum / _NUMBER_OF_SAMPLES;
Adrian Suciu 13:66c8e4ce4ff1 99 _full_scale_value = sum;
Adrian Suciu 13:66c8e4ce4ff1 100 }
Adrian Suciu 13:66c8e4ce4ff1 101 break;
Adrian Suciu 13:66c8e4ce4ff1 102
Adrian Suciu 13:66c8e4ce4ff1 103 case COMPUTE_GRAM_PER_BIT:
Adrian Suciu 13:66c8e4ce4ff1 104 _grams_per_bit = _cal_weight / (static_cast<float> (_full_scale_value - _zero_scale_value)); /* Calculate number of grams per LSB */
Adrian Suciu 13:66c8e4ce4ff1 105 // pc.printf("GRAMS/LSB = %f", _grams_per_bit);
Adrian Suciu 13:66c8e4ce4ff1 106 break;
Adrian Suciu 13:66c8e4ce4ff1 107 default:
Adrian Suciu 13:66c8e4ce4ff1 108 break;
Adrian Suciu 13:66c8e4ce4ff1 109 }
Adrian Suciu 13:66c8e4ce4ff1 110
Adrian Suciu 13:66c8e4ce4ff1 111 }
Adrian Suciu 13:66c8e4ce4ff1 112
Adrian Suciu 13:66c8e4ce4ff1 113 float CN0216::compute_weight(uint32_t data)
Adrian Suciu 13:66c8e4ce4ff1 114 {
Adrian Suciu 13:66c8e4ce4ff1 115 // 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);
Adrian Suciu 13:66c8e4ce4ff1 116 if(data<_zero_scale_value)
Adrian Suciu 13:66c8e4ce4ff1 117 data = _zero_scale_value; // clamp data to 0
Adrian Suciu 13:66c8e4ce4ff1 118 float weight_in_grams = (static_cast<float>((data) - _zero_scale_value)) * _grams_per_bit; /* Calculate weight */
Adrian Suciu 13:66c8e4ce4ff1 119 return weight_in_grams;
Adrian Suciu 13:66c8e4ce4ff1 120 }
Adrian Suciu 13:66c8e4ce4ff1 121 uint32_t CN0216::read_u32()
Adrian Suciu 13:66c8e4ce4ff1 122 {
Adrian Suciu 13:66c8e4ce4ff1 123 return ad7791.read_u32();
Adrian Suciu 13:66c8e4ce4ff1 124 }
Adrian Suciu 13:66c8e4ce4ff1 125 float CN0216::read_weight()
Adrian Suciu 13:66c8e4ce4ff1 126 {
Adrian Suciu 13:66c8e4ce4ff1 127 uint32_t weight = read_u32();
Adrian Suciu 13:66c8e4ce4ff1 128 return compute_weight(weight);
Adrian Suciu 13:66c8e4ce4ff1 129 }
Adrian Suciu 13:66c8e4ce4ff1 130