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@0:346a7fa07998, 2016-04-20 (annotated)

Committer:
MaximGordon
Date:
Wed Apr 20 21:46:06 2016 +0000
Revision:
0:346a7fa07998
Child:
3:7c0fb55eb3ff
Complete

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 * Revision History:
MaximGordon 0:346a7fa07998 8 *\n 1-18-2016 Rev 01.00 GL Initial release.
MaximGordon 0:346a7fa07998 9 *\n
MaximGordon 0:346a7fa07998 10 *
MaximGordon 0:346a7fa07998 11 * --------------------------------------------------------------------
MaximGordon 0:346a7fa07998 12 *
MaximGordon 0:346a7fa07998 13 * This code follows the following naming conventions:
MaximGordon 0:346a7fa07998 14 *
MaximGordon 0:346a7fa07998 15 *\n char ch_pmod_value
MaximGordon 0:346a7fa07998 16 *\n char (array) s_pmod_s_string[16]
MaximGordon 0:346a7fa07998 17 *\n float f_pmod_value
MaximGordon 0:346a7fa07998 18 *\n int32_t n_pmod_value
MaximGordon 0:346a7fa07998 19 *\n int32_t (array) an_pmod_value[16]
MaximGordon 0:346a7fa07998 20 *\n int16_t w_pmod_value
MaximGordon 0:346a7fa07998 21 *\n int16_t (array) aw_pmod_value[16]
MaximGordon 0:346a7fa07998 22 *\n uint16_t uw_pmod_value
MaximGordon 0:346a7fa07998 23 *\n uint16_t (array) auw_pmod_value[16]
MaximGordon 0:346a7fa07998 24 *\n uint8_t uch_pmod_value
MaximGordon 0:346a7fa07998 25 *\n uint8_t (array) auch_pmod_buffer[16]
MaximGordon 0:346a7fa07998 26 *\n uint32_t un_pmod_value
MaximGordon 0:346a7fa07998 27 *\n int32_t * pn_pmod_value
MaximGordon 0:346a7fa07998 28 *
MaximGordon 0:346a7fa07998 29 * ------------------------------------------------------------------------- */
MaximGordon 0:346a7fa07998 30 /*******************************************************************************
MaximGordon 0:346a7fa07998 31 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
MaximGordon 0:346a7fa07998 32 *
MaximGordon 0:346a7fa07998 33 * Permission is hereby granted, free of charge, to any person obtaining a
MaximGordon 0:346a7fa07998 34 * copy of this software and associated documentation files (the "Software"),
MaximGordon 0:346a7fa07998 35 * to deal in the Software without restriction, including without limitation
MaximGordon 0:346a7fa07998 36 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
MaximGordon 0:346a7fa07998 37 * and/or sell copies of the Software, and to permit persons to whom the
MaximGordon 0:346a7fa07998 38 * Software is furnished to do so, subject to the following conditions:
MaximGordon 0:346a7fa07998 39 *
MaximGordon 0:346a7fa07998 40 * The above copyright notice and this permission notice shall be included
MaximGordon 0:346a7fa07998 41 * in all copies or substantial portions of the Software.
MaximGordon 0:346a7fa07998 42 *
MaximGordon 0:346a7fa07998 43 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
MaximGordon 0:346a7fa07998 44 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MaximGordon 0:346a7fa07998 45 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
MaximGordon 0:346a7fa07998 46 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
MaximGordon 0:346a7fa07998 47 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
MaximGordon 0:346a7fa07998 48 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
MaximGordon 0:346a7fa07998 49 * OTHER DEALINGS IN THE SOFTWARE.
MaximGordon 0:346a7fa07998 50 *
MaximGordon 0:346a7fa07998 51 * Except as contained in this notice, the name of Maxim Integrated
MaximGordon 0:346a7fa07998 52 * Products, Inc. shall not be used except as stated in the Maxim Integrated
MaximGordon 0:346a7fa07998 53 * Products, Inc. Branding Policy.
MaximGordon 0:346a7fa07998 54 *
MaximGordon 0:346a7fa07998 55 * The mere transfer of this software does not imply any licenses
MaximGordon 0:346a7fa07998 56 * of trade secrets, proprietary technology, copyrights, patents,
MaximGordon 0:346a7fa07998 57 * trademarks, maskwork rights, or any other form of intellectual
MaximGordon 0:346a7fa07998 58 * property whatsoever. Maxim Integrated Products, Inc. retains all
MaximGordon 0:346a7fa07998 59 * ownership rights.
MaximGordon 0:346a7fa07998 60 *******************************************************************************
MaximGordon 0:346a7fa07998 61 */
MaximGordon 0:346a7fa07998 62 /*!\mainpage Main Page
MaximGordon 0:346a7fa07998 63 *
MaximGordon 0:346a7fa07998 64 * \section intro_sec Introduction
MaximGordon 0:346a7fa07998 65 *
MaximGordon 0:346a7fa07998 66 * This is the code documentation for the MAXREFDES117# subsystem reference design.
MaximGordon 0:346a7fa07998 67 * \n
MaximGordon 0:346a7fa07998 68 * \n The Files page contains the File List page and the Globals page.
MaximGordon 0:346a7fa07998 69 * \n
MaximGordon 0:346a7fa07998 70 * \n The Globals page contains the Functions, Variables, and Macros sub-pages.
MaximGordon 0:346a7fa07998 71 *
MaximGordon 0:346a7fa07998 72 * \image html MAXREFDES117_Block_Diagram.png "MAXREFDES117# System Block Diagram"
MaximGordon 0:346a7fa07998 73 * \n
MaximGordon 0:346a7fa07998 74 * \image html MAXREFDES117_firmware_Flowchart.png "MAXREFDES117# Firmware Flowchart"
MaximGordon 0:346a7fa07998 75 *
MaximGordon 0:346a7fa07998 76 */
MaximGordon 0:346a7fa07998 77 #include "mbed.h"
MaximGordon 0:346a7fa07998 78 #include "main.h"
MaximGordon 0:346a7fa07998 79 #include "algorithm.h"
MaximGordon 0:346a7fa07998 80 #include "MAX30102.h"
MaximGordon 0:346a7fa07998 81
MaximGordon 0:346a7fa07998 82 #define MAX_BRIGHTNESS 255
MaximGordon 0:346a7fa07998 83
MaximGordon 0:346a7fa07998 84 uint32_t un_ir_buffer[500]; //IR LED sensor data
MaximGordon 0:346a7fa07998 85 int32_t n_ir_buffer_length; //data length
MaximGordon 0:346a7fa07998 86 uint32_t un_red_buffer[500]; //Red LED sensor data
MaximGordon 0:346a7fa07998 87 int32_t n_sp02; //SPO2 value
MaximGordon 0:346a7fa07998 88 int8_t ch_spo2_valid; //indicator to show if the SP02 calculation is valid
MaximGordon 0:346a7fa07998 89 int32_t n_heart_rate; //heart rate value
MaximGordon 0:346a7fa07998 90 int8_t ch_hr_valid; //indicator to show if the heart rate calculation is valid
MaximGordon 0:346a7fa07998 91 uint8_t uch_dummy;
MaximGordon 0:346a7fa07998 92
MaximGordon 0:346a7fa07998 93 Serial pc(USBTX, USBRX); //initializes the serial port
MaximGordon 0:346a7fa07998 94 #ifdef TARGET_KL25Z
MaximGordon 0:346a7fa07998 95 PwmOut led(PTB18); //initializes the pwm output that connects to the on board LED
MaximGordon 0:346a7fa07998 96 DigitalIn INT(PTD1); //pin PTD1 connects to the interrupt output pin of the MAX30102
MaximGordon 0:346a7fa07998 97 #endif
MaximGordon 0:346a7fa07998 98 #ifdef TARGET_K64F
MaximGordon 0:346a7fa07998 99 DigitalIn INT(PTD1); //pin PTD1 connects to the interrupt output pin of the MAX30102
MaximGordon 0:346a7fa07998 100 #endif
MaximGordon 0:346a7fa07998 101 #ifdef TARGET_MAX32600MBED
MaximGordon 0:346a7fa07998 102 PwmOut led(LED_RED); //initializes the pwm output that connects to the on board LED
MaximGordon 0:346a7fa07998 103 DigitalIn INT(P2_0); //pin P20 connects to the interrupt output pin of the MAX30102
MaximGordon 0:346a7fa07998 104 #endif
MaximGordon 0:346a7fa07998 105
MaximGordon 0:346a7fa07998 106 // the setup routine runs once when you press reset:
MaximGordon 0:346a7fa07998 107 int main() {
MaximGordon 0:346a7fa07998 108 uint32_t un_min, un_max, un_prev_data; //variables to calculate the on-board LED brightness that reflects the heartbeats
MaximGordon 0:346a7fa07998 109 int i;
MaximGordon 0:346a7fa07998 110 int32_t n_brightness;
MaximGordon 0:346a7fa07998 111 float f_temp;
MaximGordon 0:346a7fa07998 112
MaximGordon 0:346a7fa07998 113 maxim_max30102_reset(); //resets the MAX30102
MaximGordon 0:346a7fa07998 114 // initialize serial communication at 115200 bits per second:
MaximGordon 0:346a7fa07998 115 pc.baud(115200);
MaximGordon 0:346a7fa07998 116 pc.format(8,SerialBase::None,1);
MaximGordon 0:346a7fa07998 117 wait(1);
MaximGordon 0:346a7fa07998 118
MaximGordon 0:346a7fa07998 119 //read and clear status register
MaximGordon 0:346a7fa07998 120 maxim_max30102_read_reg(0,&uch_dummy);
MaximGordon 0:346a7fa07998 121
MaximGordon 0:346a7fa07998 122 //wait until the user presses a key
MaximGordon 0:346a7fa07998 123 while(pc.readable()==0)
MaximGordon 0:346a7fa07998 124 {
MaximGordon 0:346a7fa07998 125 pc.printf("%c[2J",27); //clear terminal program screen
MaximGordon 0:346a7fa07998 126 pc.printf("Press any key to start conversion\n\r");
MaximGordon 0:346a7fa07998 127 wait(1);
MaximGordon 0:346a7fa07998 128 }
MaximGordon 0:346a7fa07998 129 uch_dummy=getchar();
MaximGordon 0:346a7fa07998 130
MaximGordon 0:346a7fa07998 131 maxim_max30102_init(); //initializes the MAX30102
MaximGordon 0:346a7fa07998 132
MaximGordon 0:346a7fa07998 133
MaximGordon 0:346a7fa07998 134 n_brightness=0;
MaximGordon 0:346a7fa07998 135 un_min=0x3FFFF;
MaximGordon 0:346a7fa07998 136 un_max=0;
MaximGordon 0:346a7fa07998 137
MaximGordon 0:346a7fa07998 138 n_ir_buffer_length=500; //buffer length of 100 stores 5 seconds of samples running at 100sps
MaximGordon 0:346a7fa07998 139
MaximGordon 0:346a7fa07998 140 //read the first 500 samples, and determine the signal range
MaximGordon 0:346a7fa07998 141 for(i=0;i<n_ir_buffer_length;i++)
MaximGordon 0:346a7fa07998 142 {
MaximGordon 0:346a7fa07998 143 while(INT.read()==1); //wait until the interrupt pin asserts
MaximGordon 0:346a7fa07998 144
MaximGordon 0:346a7fa07998 145 maxim_max30102_read_fifo((un_red_buffer+i), (un_ir_buffer+i)); //read from MAX30102 FIFO
MaximGordon 0:346a7fa07998 146
MaximGordon 0:346a7fa07998 147 if(un_min>un_red_buffer[i])
MaximGordon 0:346a7fa07998 148 un_min=un_red_buffer[i]; //update signal min
MaximGordon 0:346a7fa07998 149 if(un_max<un_red_buffer[i])
MaximGordon 0:346a7fa07998 150 un_max=un_red_buffer[i]; //update signal max
MaximGordon 0:346a7fa07998 151 pc.printf("red=");
MaximGordon 0:346a7fa07998 152 pc.printf("%i", un_red_buffer[i]);
MaximGordon 0:346a7fa07998 153 pc.printf(", ir=");
MaximGordon 0:346a7fa07998 154 pc.printf("%i\n\r", un_ir_buffer[i]);
MaximGordon 0:346a7fa07998 155 }
MaximGordon 0:346a7fa07998 156 un_prev_data=un_red_buffer[i];
MaximGordon 0:346a7fa07998 157
MaximGordon 0:346a7fa07998 158
MaximGordon 0:346a7fa07998 159 //calculate heart rate and SpO2 after first 500 samples (first 5 seconds of samples)
MaximGordon 0:346a7fa07998 160 maxim_heart_rate_and_oxygen_saturation(un_ir_buffer, n_ir_buffer_length, un_red_buffer , &n_sp02, &ch_spo2_valid , &n_heart_rate , &ch_hr_valid);
MaximGordon 0:346a7fa07998 161
MaximGordon 0:346a7fa07998 162 //Continuously taking samples from MAX30102. Heart rate and SpO2 are calculated every 1 second
MaximGordon 0:346a7fa07998 163 while(1)
MaximGordon 0:346a7fa07998 164 {
MaximGordon 0:346a7fa07998 165 i=0;
MaximGordon 0:346a7fa07998 166 un_min=0x3FFFF;
MaximGordon 0:346a7fa07998 167 un_max=0;
MaximGordon 0:346a7fa07998 168
MaximGordon 0:346a7fa07998 169 //dumping the first 100 sets of samples in the memory and shift the last 400 sets of samples to the top
MaximGordon 0:346a7fa07998 170 for(i=100;i<500;i++)
MaximGordon 0:346a7fa07998 171 {
MaximGordon 0:346a7fa07998 172 un_red_buffer[i-100]=un_red_buffer[i];
MaximGordon 0:346a7fa07998 173 un_ir_buffer[i-100]=un_ir_buffer[i];
MaximGordon 0:346a7fa07998 174
MaximGordon 0:346a7fa07998 175 //update the signal min and max
MaximGordon 0:346a7fa07998 176 if(un_min>un_red_buffer[i])
MaximGordon 0:346a7fa07998 177 un_min=un_red_buffer[i];
MaximGordon 0:346a7fa07998 178 if(un_max<un_red_buffer[i])
MaximGordon 0:346a7fa07998 179 un_max=un_red_buffer[i];
MaximGordon 0:346a7fa07998 180 }
MaximGordon 0:346a7fa07998 181
MaximGordon 0:346a7fa07998 182 //take 100 sets of samples before calculating the heart rate.
MaximGordon 0:346a7fa07998 183 for(i=400;i<500;i++)
MaximGordon 0:346a7fa07998 184 {
MaximGordon 0:346a7fa07998 185 un_prev_data=un_red_buffer[i-1];
MaximGordon 0:346a7fa07998 186 while(INT.read()==1);
MaximGordon 0:346a7fa07998 187 maxim_max30102_read_fifo((un_red_buffer+i), (un_ir_buffer+i));
MaximGordon 0:346a7fa07998 188
MaximGordon 0:346a7fa07998 189 if(un_red_buffer[i]>un_prev_data)
MaximGordon 0:346a7fa07998 190 {
MaximGordon 0:346a7fa07998 191 f_temp=un_red_buffer[i]-un_prev_data;
MaximGordon 0:346a7fa07998 192 f_temp/=(un_max-un_min);
MaximGordon 0:346a7fa07998 193 f_temp*=MAX_BRIGHTNESS;
MaximGordon 0:346a7fa07998 194 n_brightness-=(int)f_temp;
MaximGordon 0:346a7fa07998 195 if(n_brightness<0)
MaximGordon 0:346a7fa07998 196 n_brightness=0;
MaximGordon 0:346a7fa07998 197 }
MaximGordon 0:346a7fa07998 198 else
MaximGordon 0:346a7fa07998 199 {
MaximGordon 0:346a7fa07998 200 f_temp=un_prev_data-un_red_buffer[i];
MaximGordon 0:346a7fa07998 201 f_temp/=(un_max-un_min);
MaximGordon 0:346a7fa07998 202 f_temp*=MAX_BRIGHTNESS;
MaximGordon 0:346a7fa07998 203 n_brightness+=(int)f_temp;
MaximGordon 0:346a7fa07998 204 if(n_brightness>MAX_BRIGHTNESS)
MaximGordon 0:346a7fa07998 205 n_brightness=MAX_BRIGHTNESS;
MaximGordon 0:346a7fa07998 206 }
MaximGordon 0:346a7fa07998 207 #if defined(TARGET_KL25Z) || defined(TARGET_MAX32600MBED)
MaximGordon 0:346a7fa07998 208 led.write(1-(float)n_brightness/256);
MaximGordon 0:346a7fa07998 209 #endif
MaximGordon 0:346a7fa07998 210 //send samples and calculation result to terminal program through UART
MaximGordon 0:346a7fa07998 211 pc.printf("red=");
MaximGordon 0:346a7fa07998 212 pc.printf("%i",un_red_buffer[i]);
MaximGordon 0:346a7fa07998 213 pc.printf(", ir=");
MaximGordon 0:346a7fa07998 214 pc.printf("%i", un_ir_buffer[i]);
MaximGordon 0:346a7fa07998 215 pc.printf(", HR=%i, ",n_heart_rate);
MaximGordon 0:346a7fa07998 216 pc.printf("HRvalid=%i, ",ch_hr_valid);
MaximGordon 0:346a7fa07998 217 pc.printf("SpO2=%i, ",n_sp02);
MaximGordon 0:346a7fa07998 218 pc.printf("SPO2Valid=%i\n\r",ch_spo2_valid);
MaximGordon 0:346a7fa07998 219 }
MaximGordon 0:346a7fa07998 220 maxim_heart_rate_and_oxygen_saturation(un_ir_buffer, n_ir_buffer_length, un_red_buffer , &n_sp02, &ch_spo2_valid , &n_heart_rate , &ch_hr_valid);
MaximGordon 0:346a7fa07998 221
MaximGordon 0:346a7fa07998 222 }
MaximGordon 0:346a7fa07998 223 }
MaximGordon 0:346a7fa07998 224