File content as of revision 4:5273ab1085ab:

/** \file main.cpp ******************************************************
*
* Project: MAXREFDES117#
* Filename: main.cpp
* Description: This module contains the Main application for the MAXREFDES117 example program.
*
*
* --------------------------------------------------------------------
*
* This code follows the following naming conventions:
*
* char              ch_pmod_value
* char (array)      s_pmod_s_string[16]
* float             f_pmod_value
* int32_t           n_pmod_value
* int32_t (array)   an_pmod_value[16]
* int16_t           w_pmod_value
* int16_t (array)   aw_pmod_value[16]
* uint16_t          uw_pmod_value
* uint16_t (array)  auw_pmod_value[16]
* uint8_t           uch_pmod_value
* uint8_t (array)   auch_pmod_buffer[16]
* uint32_t          un_pmod_value
* int32_t *         pn_pmod_value
*
* ------------------------------------------------------------------------- */
/*******************************************************************************
* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of Maxim Integrated
* Products, Inc. shall not be used except as stated in the Maxim Integrated
* Products, Inc. Branding Policy.
*
* The mere transfer of this software does not imply any licenses
* of trade secrets, proprietary technology, copyrights, patents,
* trademarks, maskwork rights, or any other form of intellectual
* property whatsoever. Maxim Integrated Products, Inc. retains all
* ownership rights.
*******************************************************************************
*/
/*!\mainpage Main Page
*
* \section intro_sec Introduction
*
* This is the code documentation for the MAXREFDES117# subsystem reference design.
* 
*  The Files page contains the File List page and the Globals page.
* 
*  The Globals page contains the Functions, Variables, and Macros sub-pages.
*
* \image html MAXREFDES117_Block_Diagram.png "MAXREFDES117# System Block Diagram"
* 
* \image html MAXREFDES117_firmware_Flowchart.png "MAXREFDES117# Firmware Flowchart"
*
*/
#include "mbed.h"
#include "algorithm.h"
#include "MAX30102.h"

#define MAX_BRIGHTNESS 255

uint32_t aun_ir_buffer[500]; //IR LED sensor data
int32_t n_ir_buffer_length;    //data length
uint32_t aun_red_buffer[500];    //Red LED sensor data
int32_t n_sp02; //SPO2 value
int8_t ch_spo2_valid;   //indicator to show if the SP02 calculation is valid
int32_t n_heart_rate;   //heart rate value
int8_t  ch_hr_valid;    //indicator to show if the heart rate calculation is valid
uint8_t uch_dummy;

Serial pc(USBTX, USBRX);    //initializes the serial port
#ifdef TARGET_KL25Z 
PwmOut led(PTB18);  //initializes the pwm output that connects to the on board LED
DigitalIn INT(PTD1);  //pin PTD1 connects to the interrupt output pin of the MAX30102
#endif
#ifdef TARGET_K64F
DigitalIn INT(PTD1);  //pin PTD1 connects to the interrupt output pin of the MAX30102
#endif
#ifdef TARGET_MAX32600MBED
PwmOut led(LED_RED);    //initializes the pwm output that connects to the on board LED
DigitalIn INT(P2_0);  //pin P20 connects to the interrupt output pin of the MAX30102
#endif

// the setup routine runs once when you press reset:
int main() { 
    uint32_t un_min, un_max, un_prev_data;  //variables to calculate the on-board LED brightness that reflects the heartbeats
    int i;
    int32_t n_brightness;
    float f_temp;
    
    maxim_max30102_reset(); //resets the MAX30102
    // initialize serial communication at 115200 bits per second:
    pc.baud(115200);
    pc.format(8,SerialBase::None,1);
    wait(1);
    
    //read and clear status register
    maxim_max30102_read_reg(0,&uch_dummy);
    
    //wait until the user presses a key
    while(pc.readable()==0)
    {
        pc.printf("\x1B[2J");  //clear terminal program screen
        pc.printf("Press any key to start conversion\n\r");
        wait(1);
    }
    uch_dummy=getchar();
    
    maxim_max30102_init();  //initializes the MAX30102
        
        
    n_brightness=0;
    un_min=0x3FFFF;
    un_max=0;
  
    n_ir_buffer_length=500; //buffer length of 100 stores 5 seconds of samples running at 100sps
    
    //read the first 500 samples, and determine the signal range
    for(i=0;i<n_ir_buffer_length;i++)
    {
        while(INT.read()==1);   //wait until the interrupt pin asserts
        
        maxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i));  //read from MAX30102 FIFO
            
        if(un_min>aun_red_buffer[i])
            un_min=aun_red_buffer[i];    //update signal min
        if(un_max<aun_red_buffer[i])
            un_max=aun_red_buffer[i];    //update signal max
        pc.printf("red=");
        pc.printf("%i", aun_red_buffer[i]);
        pc.printf(", ir=");
        pc.printf("%i\n\r", aun_ir_buffer[i]);
    }
    un_prev_data=aun_red_buffer[i];
    
    
    //calculate heart rate and SpO2 after first 500 samples (first 5 seconds of samples)
    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); 
    
    //Continuously taking samples from MAX30102.  Heart rate and SpO2 are calculated every 1 second
    while(1)
    {
        i=0;
        un_min=0x3FFFF;
        un_max=0;
        
        //dumping the first 100 sets of samples in the memory and shift the last 400 sets of samples to the top
        for(i=100;i<500;i++)
        {
            aun_red_buffer[i-100]=aun_red_buffer[i];
            aun_ir_buffer[i-100]=aun_ir_buffer[i];
            
            //update the signal min and max
            if(un_min>aun_red_buffer[i])
            un_min=aun_red_buffer[i];
            if(un_max<aun_red_buffer[i])
            un_max=aun_red_buffer[i];
        }
        
        //take 100 sets of samples before calculating the heart rate.
        for(i=400;i<500;i++)
        {
            un_prev_data=aun_red_buffer[i-1];
            while(INT.read()==1);
            maxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i));
        
            if(aun_red_buffer[i]>un_prev_data)
            {
                f_temp=aun_red_buffer[i]-un_prev_data;
                f_temp/=(un_max-un_min);
                f_temp*=MAX_BRIGHTNESS;
                n_brightness-=(int)f_temp;
                if(n_brightness<0)
                    n_brightness=0;
            }
            else
            {
                f_temp=un_prev_data-aun_red_buffer[i];
                f_temp/=(un_max-un_min);
                f_temp*=MAX_BRIGHTNESS;
                n_brightness+=(int)f_temp;
                if(n_brightness>MAX_BRIGHTNESS)
                    n_brightness=MAX_BRIGHTNESS;
            }
#if defined(TARGET_KL25Z) || defined(TARGET_MAX32600MBED)
            led.write(1-(float)n_brightness/256);
#endif
            //send samples and calculation result to terminal program through UART
            pc.printf("red=");
            pc.printf("%i", aun_red_buffer[i]);
            pc.printf(", ir=");
            pc.printf("%i", aun_ir_buffer[i]);
            pc.printf(", HR=%i, ", n_heart_rate); 
            pc.printf("HRvalid=%i, ", ch_hr_valid);
            pc.printf("SpO2=%i, ", n_sp02);
            pc.printf("SPO2Valid=%i\n\r", ch_spo2_valid);
        }
        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); 
    }
}