Yu anning / Mbed 2 deprecated LPC_MAX30102

the MAX30102 driver for LPC1768 board

Dependencies:   mbed

main.cpp@0:82a90765baa2, 2018-10-26 (annotated)

Committer:
anning865
Date:
Fri Oct 26 10:30:22 2018 +0000
Revision:
0:82a90765baa2
The MAX30102 driver for LPC1768

Who changed what in which revision?

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anning865 0:82a90765baa2 1 /** \file main.cpp ******************************************************
anning865 0:82a90765baa2 2 *
anning865 0:82a90765baa2 3 * Project: MAXREFDES117#
anning865 0:82a90765baa2 4 * Filename: main.cpp
anning865 0:82a90765baa2 5 * Description: This module contains the Main application for the MAXREFDES117 example program.
anning865 0:82a90765baa2 6 *
anning865 0:82a90765baa2 7 *
anning865 0:82a90765baa2 8 * --------------------------------------------------------------------
anning865 0:82a90765baa2 9 *
anning865 0:82a90765baa2 10 * This code follows the following naming conventions:
anning865 0:82a90765baa2 11 *
anning865 0:82a90765baa2 12 * char ch_pmod_value
anning865 0:82a90765baa2 13 * char (array) s_pmod_s_string[16]
anning865 0:82a90765baa2 14 * float f_pmod_value
anning865 0:82a90765baa2 15 * int32_t n_pmod_value
anning865 0:82a90765baa2 16 * int32_t (array) an_pmod_value[16]
anning865 0:82a90765baa2 17 * int16_t w_pmod_value
anning865 0:82a90765baa2 18 * int16_t (array) aw_pmod_value[16]
anning865 0:82a90765baa2 19 * uint16_t uw_pmod_value
anning865 0:82a90765baa2 20 * uint16_t (array) auw_pmod_value[16]
anning865 0:82a90765baa2 21 * uint8_t uch_pmod_value
anning865 0:82a90765baa2 22 * uint8_t (array) auch_pmod_buffer[16]
anning865 0:82a90765baa2 23 * uint32_t un_pmod_value
anning865 0:82a90765baa2 24 * int32_t * pn_pmod_value
anning865 0:82a90765baa2 25 *
anning865 0:82a90765baa2 26 * ------------------------------------------------------------------------- */
anning865 0:82a90765baa2 27 /*******************************************************************************
anning865 0:82a90765baa2 28 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
anning865 0:82a90765baa2 29 *
anning865 0:82a90765baa2 30 * Permission is hereby granted, free of charge, to any person obtaining a
anning865 0:82a90765baa2 31 * copy of this software and associated documentation files (the "Software"),
anning865 0:82a90765baa2 32 * to deal in the Software without restriction, including without limitation
anning865 0:82a90765baa2 33 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
anning865 0:82a90765baa2 34 * and/or sell copies of the Software, and to permit persons to whom the
anning865 0:82a90765baa2 35 * Software is furnished to do so, subject to the following conditions:
anning865 0:82a90765baa2 36 *
anning865 0:82a90765baa2 37 * The above copyright notice and this permission notice shall be included
anning865 0:82a90765baa2 38 * in all copies or substantial portions of the Software.
anning865 0:82a90765baa2 39 *
anning865 0:82a90765baa2 40 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
anning865 0:82a90765baa2 41 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
anning865 0:82a90765baa2 42 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
anning865 0:82a90765baa2 43 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
anning865 0:82a90765baa2 44 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
anning865 0:82a90765baa2 45 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
anning865 0:82a90765baa2 46 * OTHER DEALINGS IN THE SOFTWARE.
anning865 0:82a90765baa2 47 *
anning865 0:82a90765baa2 48 * Except as contained in this notice, the name of Maxim Integrated
anning865 0:82a90765baa2 49 * Products, Inc. shall not be used except as stated in the Maxim Integrated
anning865 0:82a90765baa2 50 * Products, Inc. Branding Policy.
anning865 0:82a90765baa2 51 *
anning865 0:82a90765baa2 52 * The mere transfer of this software does not imply any licenses
anning865 0:82a90765baa2 53 * of trade secrets, proprietary technology, copyrights, patents,
anning865 0:82a90765baa2 54 * trademarks, maskwork rights, or any other form of intellectual
anning865 0:82a90765baa2 55 * property whatsoever. Maxim Integrated Products, Inc. retains all
anning865 0:82a90765baa2 56 * ownership rights.
anning865 0:82a90765baa2 57 *******************************************************************************
anning865 0:82a90765baa2 58 */
anning865 0:82a90765baa2 59 /*!\mainpage Main Page
anning865 0:82a90765baa2 60 *
anning865 0:82a90765baa2 61 * \section intro_sec Introduction
anning865 0:82a90765baa2 62 *
anning865 0:82a90765baa2 63 * This is the code documentation for the MAXREFDES117# subsystem reference design.
anning865 0:82a90765baa2 64 *
anning865 0:82a90765baa2 65 * The Files page contains the File List page and the Globals page.
anning865 0:82a90765baa2 66 *
anning865 0:82a90765baa2 67 * The Globals page contains the Functions, Variables, and Macros sub-pages.
anning865 0:82a90765baa2 68 *
anning865 0:82a90765baa2 69 * \image html MAXREFDES117_Block_Diagram.png "MAXREFDES117# System Block Diagram"
anning865 0:82a90765baa2 70 *
anning865 0:82a90765baa2 71 * \image html MAXREFDES117_firmware_Flowchart.png "MAXREFDES117# Firmware Flowchart"
anning865 0:82a90765baa2 72 *
anning865 0:82a90765baa2 73 */
anning865 0:82a90765baa2 74 #include "mbed.h"
anning865 0:82a90765baa2 75 #include "algorithm.h"
anning865 0:82a90765baa2 76 #include "MAX30102.h"
anning865 0:82a90765baa2 77
anning865 0:82a90765baa2 78 #define MAX_BRIGHTNESS 255
anning865 0:82a90765baa2 79 #define false 0
anning865 0:82a90765baa2 80 #define true 1
anning865 0:82a90765baa2 81
anning865 0:82a90765baa2 82 uint32_t aun_ir_buffer[500]; //IR LED sensor data
anning865 0:82a90765baa2 83 int32_t n_ir_buffer_length; //data length
anning865 0:82a90765baa2 84 uint32_t aun_red_buffer[500]; //Red LED sensor data
anning865 0:82a90765baa2 85 int32_t n_sp02; //SPO2 value
anning865 0:82a90765baa2 86 int8_t ch_spo2_valid; //indicator to show if the SP02 calculation is valid
anning865 0:82a90765baa2 87 int32_t n_heart_rate; //heart rate value
anning865 0:82a90765baa2 88 int8_t ch_hr_valid; //indicator to show if the heart rate calculation is valid
anning865 0:82a90765baa2 89 uint8_t uch_dummy;
anning865 0:82a90765baa2 90
anning865 0:82a90765baa2 91 Serial pc(USBTX, USBRX); //initializes the serial port
anning865 0:82a90765baa2 92 DigitalIn INT(p8); //pin P8 connects to the interrupt output pin of the MAX30102
anning865 0:82a90765baa2 93 PwmOut led(LED1); //initializes the pwm output that connects to the on board LED
anning865 0:82a90765baa2 94
anning865 0:82a90765baa2 95 // the setup routine runs once when you press reset:
anning865 0:82a90765baa2 96 int main() {
anning865 0:82a90765baa2 97 uint32_t un_min, un_max, un_prev_data; //variables to calculate the on-board LED brightness that reflects the heartbeats
anning865 0:82a90765baa2 98 int i;
anning865 0:82a90765baa2 99 int32_t n_brightness;
anning865 0:82a90765baa2 100 float f_temp;
anning865 0:82a90765baa2 101
anning865 0:82a90765baa2 102 maxim_max30102_reset(); //resets the MAX30102
anning865 0:82a90765baa2 103 // initialize serial communication at 115200 bits per second:
anning865 0:82a90765baa2 104 pc.baud(115200);
anning865 0:82a90765baa2 105 pc.format(8,SerialBase::None,1);
anning865 0:82a90765baa2 106 wait(1);
anning865 0:82a90765baa2 107
anning865 0:82a90765baa2 108 //read and clear status register
anning865 0:82a90765baa2 109 maxim_max30102_read_reg(0,&uch_dummy);
anning865 0:82a90765baa2 110
anning865 0:82a90765baa2 111 //wait until the user presses a key
anning865 0:82a90765baa2 112 while(pc.readable()==0)
anning865 0:82a90765baa2 113 {
anning865 0:82a90765baa2 114 pc.printf("\x1B[2J"); //clear terminal program screen
anning865 0:82a90765baa2 115 pc.printf("Press any key to start conversion\n\r");
anning865 0:82a90765baa2 116 wait(1);
anning865 0:82a90765baa2 117 }
anning865 0:82a90765baa2 118 uch_dummy=getchar();
anning865 0:82a90765baa2 119
anning865 0:82a90765baa2 120 maxim_max30102_init(); //initializes the MAX30102
anning865 0:82a90765baa2 121
anning865 0:82a90765baa2 122
anning865 0:82a90765baa2 123 n_brightness=0;
anning865 0:82a90765baa2 124 un_min=0x3FFFF;
anning865 0:82a90765baa2 125 un_max=0;
anning865 0:82a90765baa2 126
anning865 0:82a90765baa2 127 n_ir_buffer_length=500; //buffer length of 100 stores 5 seconds of samples running at 100sps
anning865 0:82a90765baa2 128
anning865 0:82a90765baa2 129 //read the first 500 samples, and determine the signal range
anning865 0:82a90765baa2 130 for(i=0;i<n_ir_buffer_length;i++)
anning865 0:82a90765baa2 131 {
anning865 0:82a90765baa2 132 while(INT.read()==1); //wait until the interrupt pin asserts
anning865 0:82a90765baa2 133
anning865 0:82a90765baa2 134 maxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i)); //read from MAX30102 FIFO
anning865 0:82a90765baa2 135
anning865 0:82a90765baa2 136 if(un_min>aun_red_buffer[i])
anning865 0:82a90765baa2 137 un_min=aun_red_buffer[i]; //update signal min
anning865 0:82a90765baa2 138 if(un_max<aun_red_buffer[i])
anning865 0:82a90765baa2 139 un_max=aun_red_buffer[i]; //update signal max
anning865 0:82a90765baa2 140 pc.printf("red=");
anning865 0:82a90765baa2 141 pc.printf("%i", aun_red_buffer[i]);
anning865 0:82a90765baa2 142 pc.printf(", ir=");
anning865 0:82a90765baa2 143 pc.printf("%i\n\r", aun_ir_buffer[i]);
anning865 0:82a90765baa2 144 }
anning865 0:82a90765baa2 145 un_prev_data=aun_red_buffer[i];
anning865 0:82a90765baa2 146
anning865 0:82a90765baa2 147
anning865 0:82a90765baa2 148 //calculate heart rate and SpO2 after first 500 samples (first 5 seconds of samples)
anning865 0:82a90765baa2 149 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);
anning865 0:82a90765baa2 150
anning865 0:82a90765baa2 151 //Continuously taking samples from MAX30102. Heart rate and SpO2 are calculated every 1 second
anning865 0:82a90765baa2 152 while(1)
anning865 0:82a90765baa2 153 {
anning865 0:82a90765baa2 154 i=0;
anning865 0:82a90765baa2 155 un_min=0x3FFFF;//???
anning865 0:82a90765baa2 156 un_max=0;
anning865 0:82a90765baa2 157
anning865 0:82a90765baa2 158 //dumping the first 100 sets of samples in the memory and shift the last 400 sets of samples to the top
anning865 0:82a90765baa2 159 for(i=100;i<500;i++)
anning865 0:82a90765baa2 160 {
anning865 0:82a90765baa2 161 aun_red_buffer[i-100]=aun_red_buffer[i];
anning865 0:82a90765baa2 162 aun_ir_buffer[i-100]=aun_ir_buffer[i];
anning865 0:82a90765baa2 163
anning865 0:82a90765baa2 164 //update the signal min and max
anning865 0:82a90765baa2 165 if(un_min>aun_red_buffer[i])
anning865 0:82a90765baa2 166 un_min=aun_red_buffer[i];
anning865 0:82a90765baa2 167 if(un_max<aun_red_buffer[i])
anning865 0:82a90765baa2 168 un_max=aun_red_buffer[i];
anning865 0:82a90765baa2 169 }
anning865 0:82a90765baa2 170
anning865 0:82a90765baa2 171 //take 100 sets of samples before calculating the heart rate.
anning865 0:82a90765baa2 172 for(i=400;i<500;i++)
anning865 0:82a90765baa2 173 {
anning865 0:82a90765baa2 174 un_prev_data=aun_red_buffer[i-1];
anning865 0:82a90765baa2 175 while(INT.read()==1);
anning865 0:82a90765baa2 176 maxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i));
anning865 0:82a90765baa2 177
anning865 0:82a90765baa2 178 if(aun_red_buffer[i]>un_prev_data)//just to determine the brightness of LED according to the deviation of adjacent two AD data
anning865 0:82a90765baa2 179 {
anning865 0:82a90765baa2 180 f_temp=aun_red_buffer[i]-un_prev_data;
anning865 0:82a90765baa2 181 f_temp/=(un_max-un_min);
anning865 0:82a90765baa2 182 f_temp*=MAX_BRIGHTNESS;
anning865 0:82a90765baa2 183 n_brightness-=(int)f_temp;
anning865 0:82a90765baa2 184 if(n_brightness<0)
anning865 0:82a90765baa2 185 n_brightness=0;
anning865 0:82a90765baa2 186 }
anning865 0:82a90765baa2 187 else
anning865 0:82a90765baa2 188 {
anning865 0:82a90765baa2 189 f_temp=un_prev_data-aun_red_buffer[i];
anning865 0:82a90765baa2 190 f_temp/=(un_max-un_min);
anning865 0:82a90765baa2 191 f_temp*=MAX_BRIGHTNESS;
anning865 0:82a90765baa2 192 n_brightness+=(int)f_temp;
anning865 0:82a90765baa2 193 if(n_brightness>MAX_BRIGHTNESS)
anning865 0:82a90765baa2 194 n_brightness=MAX_BRIGHTNESS;
anning865 0:82a90765baa2 195 }
anning865 0:82a90765baa2 196
anning865 0:82a90765baa2 197 led.write(1-(float)n_brightness/256);//pwm control led brightness
anning865 0:82a90765baa2 198
anning865 0:82a90765baa2 199 //send samples and calculation result to terminal program through UART
anning865 0:82a90765baa2 200 pc.printf("red=");
anning865 0:82a90765baa2 201 pc.printf("%i", aun_red_buffer[i]);
anning865 0:82a90765baa2 202 pc.printf(", ir=");
anning865 0:82a90765baa2 203 pc.printf("%i", aun_ir_buffer[i]);
anning865 0:82a90765baa2 204 pc.printf(", HR=%i, ", n_heart_rate);
anning865 0:82a90765baa2 205 pc.printf("HRvalid=%i, ", ch_hr_valid);
anning865 0:82a90765baa2 206 pc.printf("SpO2=%i, ", n_sp02);
anning865 0:82a90765baa2 207 pc.printf("SPO2Valid=%i\n\r", ch_spo2_valid);
anning865 0:82a90765baa2 208 }
anning865 0:82a90765baa2 209 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);
anning865 0:82a90765baa2 210 }
anning865 0:82a90765baa2 211 }
anning865 0:82a90765baa2 212