main.cpp

00001 /** \file main.cpp ******************************************************
00002 *
00003 * Project: MAXREFDES117#
00004 * Filename: main.cpp
00005 * Description: This module contains the Main application for the MAXREFDES117 example program.
00006 *
00007 * hello
00008 * --------------------------------------------------------------------
00009 *
00010 * This code follows the following naming conventions:
00011 *
00012 * char              ch_pmod_value
00013 * char (array)      s_pmod_s_string[16]
00014 * float             f_pmod_value
00015 * int32_t           n_pmod_value
00016 * int32_t (array)   an_pmod_value[16]
00017 * int16_t           w_pmod_value
00018 * int16_t (array)   aw_pmod_value[16]
00019 * uint16_t          uw_pmod_value
00020 * uint16_t (array)  auw_pmod_value[16]
00021 * uint8_t           uch_pmod_value
00022 * uint8_t (array)   auch_pmod_buffer[16]
00023 * uint32_t          un_pmod_value
00024 * int32_t *         pn_pmod_value
00025 *
00026 * ------------------------------------------------------------------------- */
00027 /*******************************************************************************
00028 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
00029 *
00030 * Permission is hereby granted, free of charge, to any person obtaining a
00031 * copy of this software and associated documentation files (the "Software"),
00032 * to deal in the Software without restriction, including without limitation
00033 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
00034 * and/or sell copies of the Software, and to permit persons to whom the
00035 * Software is furnished to do so, subject to the following conditions:
00036 *
00037 * The above copyright notice and this permission notice shall be included
00038 * in all copies or substantial portions of the Software.
00039 *
00040 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
00041 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00042 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
00043 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
00044 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
00045 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
00046 * OTHER DEALINGS IN THE SOFTWARE.
00047 *
00048 * Except as contained in this notice, the name of Maxim Integrated
00049 * Products, Inc. shall not be used except as stated in the Maxim Integrated
00050 * Products, Inc. Branding Policy.
00051 *
00052 * The mere transfer of this software does not imply any licenses
00053 * of trade secrets, proprietary technology, copyrights, patents,
00054 * trademarks, maskwork rights, or any other form of intellectual
00055 * property whatsoever. Maxim Integrated Products, Inc. retains all
00056 * ownership rights.
00057 *******************************************************************************
00058 */
00059 /*!\mainpage Main Page
00060 *
00061 * \section intro_sec Introduction
00062 *
00063 * This is the code documentation for the MAXREFDES117# subsystem reference design.
00064 * 
00065 *  The Files page contains the File List page and the Globals page.
00066 * 
00067 *  The Globals page contains the Functions, Variables, and Macros sub-pages.
00068 *
00069 * \image html MAXREFDES117_Block_Diagram.png "MAXREFDES117# System Block Diagram"
00070 * 
00071 * \image html MAXREFDES117_firmware_Flowchart.png "MAXREFDES117# Firmware Flowchart"
00072 *
00073 */
00074 #include "mbed.h"
00075 #include "algorithm.h"
00076 #include "MAX30102.h"
00077 #include "max32625pico.h"
00078 #include "USBSerial.h"
00079 
00080 #define MAX_BRIGHTNESS 255
00081 
00082 MAX32625PICO pico(MAX32625PICO::IOH_DIP_IN, MAX32625PICO::VIO_IOH, MAX32625PICO::VIO_1V8);
00083 // the setup routine runs once when you press reset:
00084 
00085 uint32_t aun_ir_buffer[500]; //IR LED sensor data
00086 int32_t n_ir_buffer_length;    //data length
00087 uint32_t aun_red_buffer[500];    //Red LED sensor data
00088 int32_t n_sp02; //SPO2 value
00089 int8_t ch_spo2_valid;   //indicator to show if the SP02 calculation is valid
00090 int32_t n_heart_rate;   //heart rate value
00091 int8_t  ch_hr_valid;    //indicator to show if the heart rate calculation is valid
00092 uint8_t uch_dummy;
00093 
00094 // Virtual serial port over USB
00095 USBSerial pc(0x0B6A, 0x4360);
00096 
00097 
00098 #ifdef TARGET_MAX32625PICO
00099 PwmOut led(LED1);    //initializes the pwm output that connects to the on board LED
00100 DigitalIn INT(P0_0);  //pin P20 connects to the interrupt output pin of the MAX30102
00101 #endif
00102 
00103 
00104 int main() { 
00105     uint32_t un_min, un_max, un_prev_data;  //variables to calculate the on-board LED brightness that reflects the heartbeats
00106     int i;
00107     int32_t n_brightness;
00108     float f_temp;
00109     wait(5);
00110     pc.printf("waiting to reset the max30102\n\r");
00111     maxim_max30102_reset(); //resets the MAX30102
00112     wait(1);
00113     pc.printf("finished resetting the max30102\n\r");
00114     //read and clear status register
00115     maxim_max30102_read_reg(0,&uch_dummy);
00116     
00117 //    //wait until the user presses a key
00118 //    while(pc.readable()==0)
00119 //    {
00120 //        pc.printf("\x1B[2J");  //clear terminal program screen
00121 //        pc.printf("Press any key to start conversion\n\r");
00122 //        wait(1);
00123 //    }
00124 //    uch_dummy=getchar();
00125     wait(1);  
00126     pc.printf("max30102 initializing...\n\r");
00127     maxim_max30102_init();  //initializes the MAX30102
00128     wait_ms(500);
00129     pc.printf("Start reading HR and SPO in:\n\r");
00130     pc.printf("3...\n\r");
00131     wait(1);
00132     pc.printf("2...\n\r");
00133     wait(1);
00134     pc.printf("1...\n\r");
00135     wait(1);
00136         
00137     n_brightness=0;
00138     un_min=0x3FFFF;
00139     un_max=0;
00140   
00141     n_ir_buffer_length=500; //buffer length of 100 stores 5 seconds of samples running at 100sps
00142     
00143     //read the first 500 samples, and determine the signal range
00144     for(i=0;i<n_ir_buffer_length;i++)
00145     {  
00146         maxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i));  //read from MAX30102 FIFO
00147         if(un_min>aun_red_buffer[i])
00148             un_min=aun_red_buffer[i];    //update signal min
00149         if(un_max<aun_red_buffer[i])
00150             un_max=aun_red_buffer[i];    //update signal max
00151         pc.printf("red=");
00152         pc.printf("%i", aun_red_buffer[i]);
00153         pc.printf(", ir=");
00154         pc.printf("%i\n\r", aun_ir_buffer[i]);
00155         wait_ms(10);
00156     }
00157     un_prev_data=aun_red_buffer[i];
00158     
00159     
00160     //calculate heart rate and SpO2 after first 500 samples (first 5 seconds of samples)
00161     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); 
00162     
00163     //Continuously taking samples from MAX30102.  Heart rate and SpO2 are calculated every 1 second
00164     while(1)
00165     {
00166         i=0;
00167         un_min=0x3FFFF;
00168         un_max=0;
00169         
00170         //dumping the first 100 sets of samples in the memory and shift the last 400 sets of samples to the top
00171         for(i=100;i<500;i++)
00172         {
00173             aun_red_buffer[i-100]=aun_red_buffer[i];
00174             aun_ir_buffer[i-100]=aun_ir_buffer[i];
00175             
00176             //update the signal min and max
00177             if(un_min>aun_red_buffer[i])
00178             un_min=aun_red_buffer[i];
00179             if(un_max<aun_red_buffer[i])
00180             un_max=aun_red_buffer[i];
00181         }
00182         
00183         //take 100 sets of samples before calculating the heart rate.
00184         for(i=400;i<500;i++)
00185         {
00186             un_prev_data=aun_red_buffer[i-1];
00187             wait_ms(10);
00188             maxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i));
00189         
00190             if(aun_red_buffer[i]>un_prev_data)
00191             {
00192                 f_temp=aun_red_buffer[i]-un_prev_data;
00193                 f_temp/=(un_max-un_min);
00194                 f_temp*=MAX_BRIGHTNESS;
00195                 n_brightness-=(int)f_temp;
00196                 if(n_brightness<0)
00197                     n_brightness=0;
00198             }
00199             else
00200             {
00201                 f_temp=un_prev_data-aun_red_buffer[i];
00202                 f_temp/=(un_max-un_min);
00203                 f_temp*=MAX_BRIGHTNESS;
00204                 n_brightness+=(int)f_temp;
00205                 if(n_brightness>MAX_BRIGHTNESS)
00206                     n_brightness=MAX_BRIGHTNESS;
00207             }
00208 #if defined(TARGET_MAX326525PICO)
00209             led.write(1-(float)n_brightness/256);
00210 #endif
00211             //send samples and calculation result to terminal program through UART
00212             pc.printf("red=");
00213             pc.printf("%i", aun_red_buffer[i]);
00214             pc.printf(", ir=");
00215             pc.printf("%i", aun_ir_buffer[i]);
00216             pc.printf(", HR=%i, ", n_heart_rate); 
00217             pc.printf("HRvalid=%i, ", ch_hr_valid);
00218             pc.printf("SpO2=%i, ", n_sp02);
00219             pc.printf("SPO2Valid=%i\n\r", ch_spo2_valid);
00220             wait_ms(10);
00221         }
00222         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); 
00223     }
00224 }
00225