Maxim Integrated / Mbed 2 deprecated RD117_MBED

MBED firmware for MAXREFDES117 Heart Rate / SpO2 sensor. Tested on KL25Z, K64F, and MAX32600MBED#

Dependencies:   mbed

main.cpp@4:5273ab1085ab, 2016-05-19 (annotated)

Committer:
MaximGordon
Date:
Thu May 19 22:04:06 2016 +0000
Revision:
4:5273ab1085ab
Parent:
3:7c0fb55eb3ff 
improved coding style

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MaximGordon 0:346a7fa07998 1 /** \file main.cpp ******************************************************
MaximGordon 0:346a7fa07998 2 *
MaximGordon 0:346a7fa07998 3 * Project: MAXREFDES117#
MaximGordon 0:346a7fa07998 4 * Filename: main.cpp
MaximGordon 0:346a7fa07998 5 * Description: This module contains the Main application for the MAXREFDES117 example program.
MaximGordon 0:346a7fa07998 6 *
MaximGordon 0:346a7fa07998 7 *
MaximGordon 0:346a7fa07998 8 * --------------------------------------------------------------------
MaximGordon 0:346a7fa07998 9 *
MaximGordon 0:346a7fa07998 10 * This code follows the following naming conventions:
MaximGordon 0:346a7fa07998 11 *
MaximGordon 4:5273ab1085ab 12 * char ch_pmod_value
MaximGordon 4:5273ab1085ab 13 * char (array) s_pmod_s_string[16]
MaximGordon 4:5273ab1085ab 14 * float f_pmod_value
MaximGordon 4:5273ab1085ab 15 * int32_t n_pmod_value
MaximGordon 4:5273ab1085ab 16 * int32_t (array) an_pmod_value[16]
MaximGordon 4:5273ab1085ab 17 * int16_t w_pmod_value
MaximGordon 4:5273ab1085ab 18 * int16_t (array) aw_pmod_value[16]
MaximGordon 4:5273ab1085ab 19 * uint16_t uw_pmod_value
MaximGordon 4:5273ab1085ab 20 * uint16_t (array) auw_pmod_value[16]
MaximGordon 4:5273ab1085ab 21 * uint8_t uch_pmod_value
MaximGordon 4:5273ab1085ab 22 * uint8_t (array) auch_pmod_buffer[16]
MaximGordon 4:5273ab1085ab 23 * uint32_t un_pmod_value
MaximGordon 4:5273ab1085ab 24 * int32_t * pn_pmod_value
MaximGordon 0:346a7fa07998 25 *
MaximGordon 0:346a7fa07998 26 * ------------------------------------------------------------------------- */
MaximGordon 0:346a7fa07998 27 /*******************************************************************************
MaximGordon 4:5273ab1085ab 28 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
MaximGordon 0:346a7fa07998 29 *
MaximGordon 0:346a7fa07998 30 * Permission is hereby granted, free of charge, to any person obtaining a
MaximGordon 0:346a7fa07998 31 * copy of this software and associated documentation files (the "Software"),
MaximGordon 0:346a7fa07998 32 * to deal in the Software without restriction, including without limitation
MaximGordon 0:346a7fa07998 33 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
MaximGordon 0:346a7fa07998 34 * and/or sell copies of the Software, and to permit persons to whom the
MaximGordon 0:346a7fa07998 35 * Software is furnished to do so, subject to the following conditions:
MaximGordon 0:346a7fa07998 36 *
MaximGordon 0:346a7fa07998 37 * The above copyright notice and this permission notice shall be included
MaximGordon 0:346a7fa07998 38 * in all copies or substantial portions of the Software.
MaximGordon 0:346a7fa07998 39 *
MaximGordon 0:346a7fa07998 40 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
MaximGordon 0:346a7fa07998 41 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MaximGordon 0:346a7fa07998 42 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
MaximGordon 0:346a7fa07998 43 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
MaximGordon 0:346a7fa07998 44 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
MaximGordon 0:346a7fa07998 45 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
MaximGordon 0:346a7fa07998 46 * OTHER DEALINGS IN THE SOFTWARE.
MaximGordon 0:346a7fa07998 47 *
MaximGordon 0:346a7fa07998 48 * Except as contained in this notice, the name of Maxim Integrated
MaximGordon 0:346a7fa07998 49 * Products, Inc. shall not be used except as stated in the Maxim Integrated
MaximGordon 0:346a7fa07998 50 * Products, Inc. Branding Policy.
MaximGordon 0:346a7fa07998 51 *
MaximGordon 0:346a7fa07998 52 * The mere transfer of this software does not imply any licenses
MaximGordon 0:346a7fa07998 53 * of trade secrets, proprietary technology, copyrights, patents,
MaximGordon 0:346a7fa07998 54 * trademarks, maskwork rights, or any other form of intellectual
MaximGordon 0:346a7fa07998 55 * property whatsoever. Maxim Integrated Products, Inc. retains all
MaximGordon 0:346a7fa07998 56 * ownership rights.
MaximGordon 0:346a7fa07998 57 *******************************************************************************
MaximGordon 0:346a7fa07998 58 */
MaximGordon 0:346a7fa07998 59 /*!\mainpage Main Page
MaximGordon 0:346a7fa07998 60 *
MaximGordon 0:346a7fa07998 61 * \section intro_sec Introduction
MaximGordon 0:346a7fa07998 62 *
MaximGordon 0:346a7fa07998 63 * This is the code documentation for the MAXREFDES117# subsystem reference design.
MaximGordon 4:5273ab1085ab 64 *
MaximGordon 4:5273ab1085ab 65 * The Files page contains the File List page and the Globals page.
MaximGordon 4:5273ab1085ab 66 *
MaximGordon 4:5273ab1085ab 67 * The Globals page contains the Functions, Variables, and Macros sub-pages.
MaximGordon 0:346a7fa07998 68 *
MaximGordon 0:346a7fa07998 69 * \image html MAXREFDES117_Block_Diagram.png "MAXREFDES117# System Block Diagram"
MaximGordon 4:5273ab1085ab 70 *
MaximGordon 0:346a7fa07998 71 * \image html MAXREFDES117_firmware_Flowchart.png "MAXREFDES117# Firmware Flowchart"
MaximGordon 0:346a7fa07998 72 *
MaximGordon 0:346a7fa07998 73 */
MaximGordon 0:346a7fa07998 74 #include "mbed.h"
MaximGordon 0:346a7fa07998 75 #include "algorithm.h"
MaximGordon 0:346a7fa07998 76 #include "MAX30102.h"
MaximGordon 0:346a7fa07998 77
MaximGordon 0:346a7fa07998 78 #define MAX_BRIGHTNESS 255
MaximGordon 0:346a7fa07998 79
MaximGordon 3:7c0fb55eb3ff 80 uint32_t aun_ir_buffer[500]; //IR LED sensor data
MaximGordon 0:346a7fa07998 81 int32_t n_ir_buffer_length; //data length
MaximGordon 3:7c0fb55eb3ff 82 uint32_t aun_red_buffer[500]; //Red LED sensor data
MaximGordon 0:346a7fa07998 83 int32_t n_sp02; //SPO2 value
MaximGordon 0:346a7fa07998 84 int8_t ch_spo2_valid; //indicator to show if the SP02 calculation is valid
MaximGordon 0:346a7fa07998 85 int32_t n_heart_rate; //heart rate value
MaximGordon 0:346a7fa07998 86 int8_t ch_hr_valid; //indicator to show if the heart rate calculation is valid
MaximGordon 0:346a7fa07998 87 uint8_t uch_dummy;
MaximGordon 0:346a7fa07998 88
MaximGordon 0:346a7fa07998 89 Serial pc(USBTX, USBRX); //initializes the serial port
MaximGordon 0:346a7fa07998 90 #ifdef TARGET_KL25Z
MaximGordon 0:346a7fa07998 91 PwmOut led(PTB18); //initializes the pwm output that connects to the on board LED
MaximGordon 0:346a7fa07998 92 DigitalIn INT(PTD1); //pin PTD1 connects to the interrupt output pin of the MAX30102
MaximGordon 0:346a7fa07998 93 #endif
MaximGordon 0:346a7fa07998 94 #ifdef TARGET_K64F
MaximGordon 0:346a7fa07998 95 DigitalIn INT(PTD1); //pin PTD1 connects to the interrupt output pin of the MAX30102
MaximGordon 0:346a7fa07998 96 #endif
MaximGordon 0:346a7fa07998 97 #ifdef TARGET_MAX32600MBED
MaximGordon 0:346a7fa07998 98 PwmOut led(LED_RED); //initializes the pwm output that connects to the on board LED
MaximGordon 0:346a7fa07998 99 DigitalIn INT(P2_0); //pin P20 connects to the interrupt output pin of the MAX30102
MaximGordon 0:346a7fa07998 100 #endif
MaximGordon 0:346a7fa07998 101
MaximGordon 0:346a7fa07998 102 // the setup routine runs once when you press reset:
MaximGordon 0:346a7fa07998 103 int main() {
MaximGordon 0:346a7fa07998 104 uint32_t un_min, un_max, un_prev_data; //variables to calculate the on-board LED brightness that reflects the heartbeats
MaximGordon 0:346a7fa07998 105 int i;
MaximGordon 0:346a7fa07998 106 int32_t n_brightness;
MaximGordon 0:346a7fa07998 107 float f_temp;
MaximGordon 0:346a7fa07998 108
MaximGordon 0:346a7fa07998 109 maxim_max30102_reset(); //resets the MAX30102
MaximGordon 0:346a7fa07998 110 // initialize serial communication at 115200 bits per second:
MaximGordon 0:346a7fa07998 111 pc.baud(115200);
MaximGordon 0:346a7fa07998 112 pc.format(8,SerialBase::None,1);
MaximGordon 0:346a7fa07998 113 wait(1);
MaximGordon 0:346a7fa07998 114
MaximGordon 0:346a7fa07998 115 //read and clear status register
MaximGordon 0:346a7fa07998 116 maxim_max30102_read_reg(0,&uch_dummy);
MaximGordon 0:346a7fa07998 117
MaximGordon 0:346a7fa07998 118 //wait until the user presses a key
MaximGordon 0:346a7fa07998 119 while(pc.readable()==0)
MaximGordon 0:346a7fa07998 120 {
MaximGordon 4:5273ab1085ab 121 pc.printf("\x1B[2J"); //clear terminal program screen
MaximGordon 0:346a7fa07998 122 pc.printf("Press any key to start conversion\n\r");
MaximGordon 0:346a7fa07998 123 wait(1);
MaximGordon 0:346a7fa07998 124 }
MaximGordon 0:346a7fa07998 125 uch_dummy=getchar();
MaximGordon 0:346a7fa07998 126
MaximGordon 0:346a7fa07998 127 maxim_max30102_init(); //initializes the MAX30102
MaximGordon 0:346a7fa07998 128
MaximGordon 0:346a7fa07998 129
MaximGordon 0:346a7fa07998 130 n_brightness=0;
MaximGordon 0:346a7fa07998 131 un_min=0x3FFFF;
MaximGordon 0:346a7fa07998 132 un_max=0;
MaximGordon 0:346a7fa07998 133
MaximGordon 0:346a7fa07998 134 n_ir_buffer_length=500; //buffer length of 100 stores 5 seconds of samples running at 100sps
MaximGordon 0:346a7fa07998 135
MaximGordon 0:346a7fa07998 136 //read the first 500 samples, and determine the signal range
MaximGordon 0:346a7fa07998 137 for(i=0;i<n_ir_buffer_length;i++)
MaximGordon 0:346a7fa07998 138 {
MaximGordon 0:346a7fa07998 139 while(INT.read()==1); //wait until the interrupt pin asserts
MaximGordon 0:346a7fa07998 140
MaximGordon 3:7c0fb55eb3ff 141 maxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i)); //read from MAX30102 FIFO
MaximGordon 0:346a7fa07998 142
MaximGordon 3:7c0fb55eb3ff 143 if(un_min>aun_red_buffer[i])
MaximGordon 3:7c0fb55eb3ff 144 un_min=aun_red_buffer[i]; //update signal min
MaximGordon 3:7c0fb55eb3ff 145 if(un_max<aun_red_buffer[i])
MaximGordon 3:7c0fb55eb3ff 146 un_max=aun_red_buffer[i]; //update signal max
MaximGordon 0:346a7fa07998 147 pc.printf("red=");
MaximGordon 3:7c0fb55eb3ff 148 pc.printf("%i", aun_red_buffer[i]);
MaximGordon 0:346a7fa07998 149 pc.printf(", ir=");
MaximGordon 3:7c0fb55eb3ff 150 pc.printf("%i\n\r", aun_ir_buffer[i]);
MaximGordon 0:346a7fa07998 151 }
MaximGordon 3:7c0fb55eb3ff 152 un_prev_data=aun_red_buffer[i];
MaximGordon 0:346a7fa07998 153
MaximGordon 0:346a7fa07998 154
MaximGordon 0:346a7fa07998 155 //calculate heart rate and SpO2 after first 500 samples (first 5 seconds of samples)
MaximGordon 4:5273ab1085ab 156 maxim_heart_rate_and_oxygen_saturation(aun_ir_buffer, n_ir_buffer_length, aun_red_buffer, &n_sp02, &ch_spo2_valid, &n_heart_rate, &ch_hr_valid);
MaximGordon 0:346a7fa07998 157
MaximGordon 0:346a7fa07998 158 //Continuously taking samples from MAX30102. Heart rate and SpO2 are calculated every 1 second
MaximGordon 0:346a7fa07998 159 while(1)
MaximGordon 0:346a7fa07998 160 {
MaximGordon 0:346a7fa07998 161 i=0;
MaximGordon 0:346a7fa07998 162 un_min=0x3FFFF;
MaximGordon 0:346a7fa07998 163 un_max=0;
MaximGordon 0:346a7fa07998 164
MaximGordon 0:346a7fa07998 165 //dumping the first 100 sets of samples in the memory and shift the last 400 sets of samples to the top
MaximGordon 0:346a7fa07998 166 for(i=100;i<500;i++)
MaximGordon 0:346a7fa07998 167 {
MaximGordon 3:7c0fb55eb3ff 168 aun_red_buffer[i-100]=aun_red_buffer[i];
MaximGordon 3:7c0fb55eb3ff 169 aun_ir_buffer[i-100]=aun_ir_buffer[i];
MaximGordon 0:346a7fa07998 170
MaximGordon 0:346a7fa07998 171 //update the signal min and max
MaximGordon 3:7c0fb55eb3ff 172 if(un_min>aun_red_buffer[i])
MaximGordon 3:7c0fb55eb3ff 173 un_min=aun_red_buffer[i];
MaximGordon 3:7c0fb55eb3ff 174 if(un_max<aun_red_buffer[i])
MaximGordon 3:7c0fb55eb3ff 175 un_max=aun_red_buffer[i];
MaximGordon 0:346a7fa07998 176 }
MaximGordon 0:346a7fa07998 177
MaximGordon 0:346a7fa07998 178 //take 100 sets of samples before calculating the heart rate.
MaximGordon 0:346a7fa07998 179 for(i=400;i<500;i++)
MaximGordon 0:346a7fa07998 180 {
MaximGordon 3:7c0fb55eb3ff 181 un_prev_data=aun_red_buffer[i-1];
MaximGordon 0:346a7fa07998 182 while(INT.read()==1);
MaximGordon 3:7c0fb55eb3ff 183 maxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i));
MaximGordon 0:346a7fa07998 184
MaximGordon 3:7c0fb55eb3ff 185 if(aun_red_buffer[i]>un_prev_data)
MaximGordon 0:346a7fa07998 186 {
MaximGordon 3:7c0fb55eb3ff 187 f_temp=aun_red_buffer[i]-un_prev_data;
MaximGordon 0:346a7fa07998 188 f_temp/=(un_max-un_min);
MaximGordon 0:346a7fa07998 189 f_temp*=MAX_BRIGHTNESS;
MaximGordon 0:346a7fa07998 190 n_brightness-=(int)f_temp;
MaximGordon 0:346a7fa07998 191 if(n_brightness<0)
MaximGordon 0:346a7fa07998 192 n_brightness=0;
MaximGordon 0:346a7fa07998 193 }
MaximGordon 0:346a7fa07998 194 else
MaximGordon 0:346a7fa07998 195 {
MaximGordon 3:7c0fb55eb3ff 196 f_temp=un_prev_data-aun_red_buffer[i];
MaximGordon 0:346a7fa07998 197 f_temp/=(un_max-un_min);
MaximGordon 0:346a7fa07998 198 f_temp*=MAX_BRIGHTNESS;
MaximGordon 0:346a7fa07998 199 n_brightness+=(int)f_temp;
MaximGordon 0:346a7fa07998 200 if(n_brightness>MAX_BRIGHTNESS)
MaximGordon 0:346a7fa07998 201 n_brightness=MAX_BRIGHTNESS;
MaximGordon 0:346a7fa07998 202 }
MaximGordon 0:346a7fa07998 203 #if defined(TARGET_KL25Z) || defined(TARGET_MAX32600MBED)
MaximGordon 0:346a7fa07998 204 led.write(1-(float)n_brightness/256);
MaximGordon 0:346a7fa07998 205 #endif
MaximGordon 0:346a7fa07998 206 //send samples and calculation result to terminal program through UART
MaximGordon 0:346a7fa07998 207 pc.printf("red=");
MaximGordon 4:5273ab1085ab 208 pc.printf("%i", aun_red_buffer[i]);
MaximGordon 0:346a7fa07998 209 pc.printf(", ir=");
MaximGordon 3:7c0fb55eb3ff 210 pc.printf("%i", aun_ir_buffer[i]);
MaximGordon 4:5273ab1085ab 211 pc.printf(", HR=%i, ", n_heart_rate);
MaximGordon 4:5273ab1085ab 212 pc.printf("HRvalid=%i, ", ch_hr_valid);
MaximGordon 4:5273ab1085ab 213 pc.printf("SpO2=%i, ", n_sp02);
MaximGordon 4:5273ab1085ab 214 pc.printf("SPO2Valid=%i\n\r", ch_spo2_valid);
MaximGordon 0:346a7fa07998 215 }
MaximGordon 4:5273ab1085ab 216 maxim_heart_rate_and_oxygen_saturation(aun_ir_buffer, n_ir_buffer_length, aun_red_buffer, &n_sp02, &ch_spo2_valid, &n_heart_rate, &ch_hr_valid);
MaximGordon 0:346a7fa07998 217 }
MaximGordon 0:346a7fa07998 218 }
MaximGordon 0:346a7fa07998 219