Revision 0:cc636f742803, committed 2020-02-13

Comitter:

jonaangelica

Date:

Thu Feb 13 14:55:02 2020 +0000

Commit message:

commit;

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Adafruit_FeatherOLED.lib	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/teams/group2-QM/code/Adafruit_FeatherOLED_3/#4f1803f9d4e7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MAX30102/MAX30102.cpp	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,221 @@
+/** \file max30102.cpp ******************************************************
+*
+* Project: MAXREFDES117#
+* Filename: max30102.cpp
+* Description: This module is an embedded controller driver for the MAX30102
+*
+*
+* --------------------------------------------------------------------
+*
+* 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.
+*******************************************************************************
+*/
+#include "mbed.h"
+#include "MAX30102.h"
+
+#ifdef TARGET_MAX32630FTHR
+I2C i2c(P3_4, P3_5); // SDA, SCL
+//I2C i2c(I2C1_SDA, I2C1_SCL);
+#else
+I2C i2c(I2C_SDA, I2C_SCL);
+#endif
+
+bool maxim_max30102_write_reg(uint8_t uch_addr, uint8_t uch_data)
+/**
+* \brief        Write a value to a MAX30102 register
+* \par          Details
+*               This function writes a value to a MAX30102 register
+*
+* \param[in]    uch_addr    - register address
+* \param[in]    uch_data    - register data
+*
+* \retval       true on success
+*/
+{
+  char ach_i2c_data[2];
+  ach_i2c_data[0]=uch_addr;
+  ach_i2c_data[1]=uch_data;
+  
+  if(i2c.write(I2C_WRITE_ADDR, ach_i2c_data, 2, false)==0)
+    return true;
+  else
+    return false;
+}
+
+bool maxim_max30102_read_reg(uint8_t uch_addr, uint8_t *puch_data)
+/**
+* \brief        Read a MAX30102 register
+* \par          Details
+*               This function reads a MAX30102 register
+*
+* \param[in]    uch_addr    - register address
+* \param[out]   puch_data    - pointer that stores the register data
+*
+* \retval       true on success
+*/
+{
+  char ch_i2c_data;
+  ch_i2c_data=uch_addr;
+  if(i2c.write(I2C_WRITE_ADDR, &ch_i2c_data, 1, true)!=0)
+    return false;
+  if(i2c.read(I2C_READ_ADDR, &ch_i2c_data, 1, false)==0)
+  {
+    *puch_data=(uint8_t) ch_i2c_data;
+    return true;
+  }
+  else
+    return false;
+}
+
+bool maxim_max30102_init()
+/**
+* \brief        Initialize the MAX30102
+* \par          Details
+*               This function initializes the MAX30102
+*
+* \param        None
+*
+* \retval       true on success
+*/
+{
+  if(!maxim_max30102_write_reg(REG_INTR_ENABLE_1,0xc0)) // INTR setting
+    return false;
+  if(!maxim_max30102_write_reg(REG_INTR_ENABLE_2,0x00))
+    return false;
+  if(!maxim_max30102_write_reg(REG_FIFO_WR_PTR,0x00))  //FIFO_WR_PTR[4:0]
+    return false;
+  if(!maxim_max30102_write_reg(REG_OVF_COUNTER,0x00))  //OVF_COUNTER[4:0]
+    return false;
+  if(!maxim_max30102_write_reg(REG_FIFO_RD_PTR,0x00))  //FIFO_RD_PTR[4:0]
+    return false;
+  if(!maxim_max30102_write_reg(REG_FIFO_CONFIG,0x0f))  //sample avg = 1, fifo rollover=false, fifo almost full = 17
+    return false;
+  if(!maxim_max30102_write_reg(REG_MODE_CONFIG,0x03))   //0x02 for Red only, 0x03 for SpO2 mode 0x07 multimode LED
+    return false;
+  if(!maxim_max30102_write_reg(REG_SPO2_CONFIG,0x27))  // SPO2_ADC range = 4096nA, SPO2 sample rate (100 Hz), LED pulseWidth (400uS)
+    return false;
+  
+  if(!maxim_max30102_write_reg(REG_LED1_PA,0x24))   //Choose value for ~ 7mA for LED1
+    return false;
+  if(!maxim_max30102_write_reg(REG_LED2_PA,0x24))   // Choose value for ~ 7mA for LED2
+    return false;
+  if(!maxim_max30102_write_reg(REG_PILOT_PA,0x7f))   // Choose value for ~ 25mA for Pilot LED
+    return false;
+  return true;  
+}
+
+bool maxim_max30102_read_fifo(uint32_t *pun_red_led, uint32_t *pun_ir_led)
+/**
+* \brief        Read a set of samples from the MAX30102 FIFO register
+* \par          Details
+*               This function reads a set of samples from the MAX30102 FIFO register
+*
+* \param[out]   *pun_red_led   - pointer that stores the red LED reading data
+* \param[out]   *pun_ir_led    - pointer that stores the IR LED reading data
+*
+* \retval       true on success
+*/
+{
+  uint32_t un_temp;
+  unsigned char uch_temp;
+  *pun_red_led=0;
+  *pun_ir_led=0;
+  char ach_i2c_data[6];
+  
+  //read and clear status register
+  maxim_max30102_read_reg(REG_INTR_STATUS_1, &uch_temp);
+  maxim_max30102_read_reg(REG_INTR_STATUS_2, &uch_temp);
+  
+  ach_i2c_data[0]=REG_FIFO_DATA;
+  if(i2c.write(I2C_WRITE_ADDR, ach_i2c_data, 1, true)!=0)
+    return false;
+  if(i2c.read(I2C_READ_ADDR, ach_i2c_data, 6, false)!=0)
+  {
+    return false;
+  }
+  un_temp=(unsigned char) ach_i2c_data[0];
+  un_temp<<=16;
+  *pun_red_led+=un_temp;
+  un_temp=(unsigned char) ach_i2c_data[1];
+  un_temp<<=8;
+  *pun_red_led+=un_temp;
+  un_temp=(unsigned char) ach_i2c_data[2];
+  *pun_red_led+=un_temp;
+  
+  un_temp=(unsigned char) ach_i2c_data[3];
+  un_temp<<=16;
+  *pun_ir_led+=un_temp;
+  un_temp=(unsigned char) ach_i2c_data[4];
+  un_temp<<=8;
+  *pun_ir_led+=un_temp;
+  un_temp=(unsigned char) ach_i2c_data[5];
+  *pun_ir_led+=un_temp;
+  *pun_red_led&=0x03FFFF;  //Mask MSB [23:18]
+  *pun_ir_led&=0x03FFFF;  //Mask MSB [23:18]
+  
+  
+  return true;
+}
+
+bool maxim_max30102_reset()
+/**
+* \brief        Reset the MAX30102
+* \par          Details
+*               This function resets the MAX30102
+*
+* \param        None
+*
+* \retval       true on success
+*/
+{
+    if(!maxim_max30102_write_reg(REG_MODE_CONFIG,0x40))
+        return false;
+    else
+        return true;    
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MAX30102/MAX30102.h	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,97 @@
+/** \file max30102.h ******************************************************
+*
+* Project: MAXREFDES117#
+* Filename: max30102.h
+* Description: This module is an embedded controller driver header file for MAX30102
+*
+*
+* --------------------------------------------------------------------
+*
+* 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.
+*******************************************************************************
+*/
+#ifndef MAX30102_H_
+#define MAX30102_H_
+
+#include "mbed.h"
+
+#define I2C_WRITE_ADDR 0xAE
+#define I2C_READ_ADDR 0xAF
+
+//register addresses
+#define REG_INTR_STATUS_1 0x00
+#define REG_INTR_STATUS_2 0x01
+#define REG_INTR_ENABLE_1 0x02
+#define REG_INTR_ENABLE_2 0x03
+#define REG_FIFO_WR_PTR 0x04
+#define REG_OVF_COUNTER 0x05
+#define REG_FIFO_RD_PTR 0x06
+#define REG_FIFO_DATA 0x07
+#define REG_FIFO_CONFIG 0x08
+#define REG_MODE_CONFIG 0x09
+#define REG_SPO2_CONFIG 0x0A
+#define REG_LED1_PA 0x0C
+#define REG_LED2_PA 0x0D
+#define REG_PILOT_PA 0x10
+#define REG_MULTI_LED_CTRL1 0x11
+#define REG_MULTI_LED_CTRL2 0x12
+#define REG_TEMP_INTR 0x1F
+#define REG_TEMP_FRAC 0x20
+#define REG_TEMP_CONFIG 0x21
+#define REG_PROX_INT_THRESH 0x30
+#define REG_REV_ID 0xFE
+#define REG_PART_ID 0xFF
+
+bool maxim_max30102_init();
+bool maxim_max30102_read_fifo(uint32_t *pun_red_led, uint32_t *pun_ir_led);
+bool maxim_max30102_write_reg(uint8_t uch_addr, uint8_t uch_data);
+bool maxim_max30102_read_reg(uint8_t uch_addr, uint8_t *puch_data);
+bool maxim_max30102_reset(void);
+
+#endif /* MAX30102_H_ */
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBDevice.lib	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,1 @@
+https://developer.mbed.org/teams/MaximIntegrated/code/USBDevice/#dad310740b28

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/algorithm/algorithm.cpp	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,363 @@
+/** \file algorithm.cpp ******************************************************
+*
+* Project: MAXREFDES117#
+* Filename: algorithm.cpp
+* Description: This module calculates the heart rate/SpO2 level
+*
+*
+* --------------------------------------------------------------------
+*
+* 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.
+*******************************************************************************
+*/
+#include "algorithm.h"
+#include "mbed.h"
+
+void maxim_heart_rate_and_oxygen_saturation(uint32_t *pun_ir_buffer,  int32_t n_ir_buffer_length, uint32_t *pun_red_buffer, int32_t *pn_spo2, int8_t *pch_spo2_valid, 
+                              int32_t *pn_heart_rate, int8_t  *pch_hr_valid)
+/**
+* \brief        Calculate the heart rate and SpO2 level
+* \par          Details
+*               By detecting  peaks of PPG cycle and corresponding AC/DC of red/infra-red signal, the ratio for the SPO2 is computed.
+*               Since this algorithm is aiming for Arm M0/M3. formaula for SPO2 did not achieve the accuracy due to register overflow.
+*               Thus, accurate SPO2 is precalculated and save longo uch_spo2_table[] per each ratio.
+*
+* \param[in]    *pun_ir_buffer           - IR sensor data buffer
+* \param[in]    n_ir_buffer_length      - IR sensor data buffer length
+* \param[in]    *pun_red_buffer          - Red sensor data buffer
+* \param[out]    *pn_spo2                - Calculated SpO2 value
+* \param[out]    *pch_spo2_valid         - 1 if the calculated SpO2 value is valid
+* \param[out]    *pn_heart_rate          - Calculated heart rate value
+* \param[out]    *pch_hr_valid           - 1 if the calculated heart rate value is valid
+*
+* \retval       None
+*/
+{
+    uint32_t un_ir_mean ,un_only_once ;
+    int32_t k ,n_i_ratio_count;
+    int32_t i,s ,m, n_exact_ir_valley_locs_count ,n_middle_idx;
+    int32_t n_th1, n_npks,n_c_min;      
+    int32_t an_ir_valley_locs[15] ;
+    int32_t an_exact_ir_valley_locs[15] ;
+    int32_t an_dx_peak_locs[15] ;
+    int32_t n_peak_interval_sum;
+    
+    int32_t n_y_ac, n_x_ac;
+    int32_t n_spo2_calc; 
+    int32_t n_y_dc_max, n_x_dc_max; 
+    int32_t n_y_dc_max_idx, n_x_dc_max_idx; 
+    int32_t an_ratio[5],n_ratio_average; 
+    int32_t n_nume,  n_denom ;
+    // remove DC of ir signal    
+    un_ir_mean =0; 
+    for (k=0 ; k<n_ir_buffer_length ; k++ ) un_ir_mean += pun_ir_buffer[k] ;
+    un_ir_mean =un_ir_mean/n_ir_buffer_length ;
+    for (k=0 ; k<n_ir_buffer_length ; k++ )  an_x[k] =  pun_ir_buffer[k] - un_ir_mean ; 
+    
+    // 4 pt Moving Average
+    for(k=0; k< BUFFER_SIZE-MA4_SIZE; k++){
+        n_denom= ( an_x[k]+an_x[k+1]+ an_x[k+2]+ an_x[k+3]);
+        an_x[k]=  n_denom/(int32_t)4; 
+    }
+
+    // get difference of smoothed IR signal
+    
+    for( k=0; k<BUFFER_SIZE-MA4_SIZE-1;  k++)
+        an_dx[k]= (an_x[k+1]- an_x[k]);
+
+    // 2-pt Moving Average to an_dx
+    for(k=0; k< BUFFER_SIZE-MA4_SIZE-2; k++){
+        an_dx[k] =  ( an_dx[k]+an_dx[k+1])/2 ;
+    }
+    
+    // hamming window
+    // flip wave form so that we can detect valley with peak detector
+    for ( i=0 ; i<BUFFER_SIZE-HAMMING_SIZE-MA4_SIZE-2 ;i++){
+        s= 0;
+        for( k=i; k<i+ HAMMING_SIZE ;k++){
+            s -= an_dx[k] *auw_hamm[k-i] ; 
+                     }
+        an_dx[i]= s/ (int32_t)1146; // divide by sum of auw_hamm 
+    }
+
+ 
+    n_th1=0; // threshold calculation
+    for ( k=0 ; k<BUFFER_SIZE-HAMMING_SIZE ;k++){
+        n_th1 += ((an_dx[k]>0)? an_dx[k] : ((int32_t)0-an_dx[k])) ;
+    }
+    n_th1= n_th1/ ( BUFFER_SIZE-HAMMING_SIZE);
+    // peak location is acutally index for sharpest location of raw signal since we flipped the signal         
+    maxim_find_peaks( an_dx_peak_locs, &n_npks, an_dx, BUFFER_SIZE-HAMMING_SIZE, n_th1, 8, 5 );//peak_height, peak_distance, max_num_peaks 
+
+    n_peak_interval_sum =0;
+    if (n_npks>=2){
+        for (k=1; k<n_npks; k++)
+            n_peak_interval_sum += (an_dx_peak_locs[k]-an_dx_peak_locs[k -1]);
+        n_peak_interval_sum=n_peak_interval_sum/(n_npks-1);
+        *pn_heart_rate=(int32_t)(6000/n_peak_interval_sum);// beats per minutes
+        *pch_hr_valid  = 1;
+    }
+    else  {
+        *pn_heart_rate = -999;
+        *pch_hr_valid  = 0;
+    }
+            
+    for ( k=0 ; k<n_npks ;k++)
+        an_ir_valley_locs[k]=an_dx_peak_locs[k]+HAMMING_SIZE/2; 
+
+
+    // raw value : RED(=y) and IR(=X)
+    // we need to assess DC and AC value of ir and red PPG. 
+    for (k=0 ; k<n_ir_buffer_length ; k++ )  {
+        an_x[k] =  pun_ir_buffer[k] ; 
+        an_y[k] =  pun_red_buffer[k] ; 
+    }
+
+    // find precise min near an_ir_valley_locs
+    n_exact_ir_valley_locs_count =0; 
+    for(k=0 ; k<n_npks ;k++){
+        un_only_once =1;
+        m=an_ir_valley_locs[k];
+        n_c_min= 16777216;//2^24;
+        if (m+5 <  BUFFER_SIZE-HAMMING_SIZE  && m-5 >0){
+            for(i= m-5;i<m+5; i++)
+                if (an_x[i]<n_c_min){
+                    if (un_only_once >0){
+                       un_only_once =0;
+                   } 
+                   n_c_min= an_x[i] ;
+                   an_exact_ir_valley_locs[k]=i;
+                }
+            if (un_only_once ==0)
+                n_exact_ir_valley_locs_count ++ ;
+        }
+    }
+    if (n_exact_ir_valley_locs_count <2 ){
+       *pn_spo2 =  -999 ; // do not use SPO2 since signal ratio is out of range
+       *pch_spo2_valid  = 0; 
+       return;
+    }
+    // 4 pt MA
+    for(k=0; k< BUFFER_SIZE-MA4_SIZE; k++){
+        an_x[k]=( an_x[k]+an_x[k+1]+ an_x[k+2]+ an_x[k+3])/(int32_t)4;
+        an_y[k]=( an_y[k]+an_y[k+1]+ an_y[k+2]+ an_y[k+3])/(int32_t)4;
+    }
+
+    //using an_exact_ir_valley_locs , find ir-red DC andir-red AC for SPO2 calibration ratio
+    //finding AC/DC maximum of raw ir * red between two valley locations
+    n_ratio_average =0; 
+    n_i_ratio_count =0; 
+    
+    for(k=0; k< 5; k++) an_ratio[k]=0;
+    for (k=0; k< n_exact_ir_valley_locs_count; k++){
+        if (an_exact_ir_valley_locs[k] > BUFFER_SIZE ){             
+            *pn_spo2 =  -999 ; // do not use SPO2 since valley loc is out of range
+            *pch_spo2_valid  = 0; 
+            return;
+        }
+    }
+    // find max between two valley locations 
+    // and use ratio betwen AC compoent of Ir & Red and DC compoent of Ir & Red for SPO2 
+
+    for (k=0; k< n_exact_ir_valley_locs_count-1; k++){
+        n_y_dc_max= -16777216 ; 
+        n_x_dc_max= - 16777216; 
+        if (an_exact_ir_valley_locs[k+1]-an_exact_ir_valley_locs[k] >10){
+            for (i=an_exact_ir_valley_locs[k]; i< an_exact_ir_valley_locs[k+1]; i++){
+                if (an_x[i]> n_x_dc_max) {n_x_dc_max =an_x[i];n_x_dc_max_idx =i; }
+                if (an_y[i]> n_y_dc_max) {n_y_dc_max =an_y[i];n_y_dc_max_idx=i;}
+            }
+            n_y_ac= (an_y[an_exact_ir_valley_locs[k+1]] - an_y[an_exact_ir_valley_locs[k] ] )*(n_y_dc_max_idx -an_exact_ir_valley_locs[k]); //red
+            n_y_ac=  an_y[an_exact_ir_valley_locs[k]] + n_y_ac/ (an_exact_ir_valley_locs[k+1] - an_exact_ir_valley_locs[k])  ; 
+        
+        
+            n_y_ac=  an_y[n_y_dc_max_idx] - n_y_ac;    // subracting linear DC compoenents from raw 
+            n_x_ac= (an_x[an_exact_ir_valley_locs[k+1]] - an_x[an_exact_ir_valley_locs[k] ] )*(n_x_dc_max_idx -an_exact_ir_valley_locs[k]); // ir
+            n_x_ac=  an_x[an_exact_ir_valley_locs[k]] + n_x_ac/ (an_exact_ir_valley_locs[k+1] - an_exact_ir_valley_locs[k]); 
+            n_x_ac=  an_x[n_y_dc_max_idx] - n_x_ac;      // subracting linear DC compoenents from raw 
+            n_nume=( n_y_ac *n_x_dc_max)>>7 ; //prepare X100 to preserve floating value
+            n_denom= ( n_x_ac *n_y_dc_max)>>7;
+            if (n_denom>0  && n_i_ratio_count <5 &&  n_nume != 0)
+            {   
+                an_ratio[n_i_ratio_count]= (n_nume*100)/n_denom ; //formular is ( n_y_ac *n_x_dc_max) / ( n_x_ac *n_y_dc_max) ;
+                n_i_ratio_count++;
+            }
+        }
+    }
+
+    maxim_sort_ascend(an_ratio, n_i_ratio_count);
+    n_middle_idx= n_i_ratio_count/2;
+
+    if (n_middle_idx >1)
+        n_ratio_average =( an_ratio[n_middle_idx-1] +an_ratio[n_middle_idx])/2; // use median
+    else
+        n_ratio_average = an_ratio[n_middle_idx ];
+
+    if( n_ratio_average>2 && n_ratio_average <184){
+        n_spo2_calc= uch_spo2_table[n_ratio_average] ;
+        *pn_spo2 = n_spo2_calc ;
+        *pch_spo2_valid  = 1;//  float_SPO2 =  -45.060*n_ratio_average* n_ratio_average/10000 + 30.354 *n_ratio_average/100 + 94.845 ;  // for comparison with table
+    }
+    else{
+        *pn_spo2 =  -999 ; // do not use SPO2 since signal ratio is out of range
+        *pch_spo2_valid  = 0; 
+    }
+}
+
+
+void maxim_find_peaks(int32_t *pn_locs, int32_t *pn_npks, int32_t *pn_x, int32_t n_size, int32_t n_min_height, int32_t n_min_distance, int32_t n_max_num)
+/**
+* \brief        Find peaks
+* \par          Details
+*               Find at most MAX_NUM peaks above MIN_HEIGHT separated by at least MIN_DISTANCE
+*
+* \retval       None
+*/
+{
+    maxim_peaks_above_min_height( pn_locs, pn_npks, pn_x, n_size, n_min_height );
+    maxim_remove_close_peaks( pn_locs, pn_npks, pn_x, n_min_distance );
+    *pn_npks = min( *pn_npks, n_max_num );
+}
+
+void maxim_peaks_above_min_height(int32_t *pn_locs, int32_t *pn_npks, int32_t  *pn_x, int32_t n_size, int32_t n_min_height)
+/**
+* \brief        Find peaks above n_min_height
+* \par          Details
+*               Find all peaks above MIN_HEIGHT
+*
+* \retval       None
+*/
+{
+    int32_t i = 1, n_width;
+    *pn_npks = 0;
+    
+    while (i < n_size-1){
+        if (pn_x[i] > n_min_height && pn_x[i] > pn_x[i-1]){            // find left edge of potential peaks
+            n_width = 1;
+            while (i+n_width < n_size && pn_x[i] == pn_x[i+n_width])    // find flat peaks
+                n_width++;
+            if (pn_x[i] > pn_x[i+n_width] && (*pn_npks) < 15 ){                            // find right edge of peaks
+                pn_locs[(*pn_npks)++] = i;        
+                // for flat peaks, peak location is left edge
+                i += n_width+1;
+            }
+            else
+                i += n_width;
+        }
+        else
+            i++;
+    }
+}
+
+
+void maxim_remove_close_peaks(int32_t *pn_locs, int32_t *pn_npks, int32_t *pn_x,int32_t n_min_distance)
+/**
+* \brief        Remove peaks
+* \par          Details
+*               Remove peaks separated by less than MIN_DISTANCE
+*
+* \retval       None
+*/
+{
+    
+    int32_t i, j, n_old_npks, n_dist;
+    
+    /* Order peaks from large to small */
+    maxim_sort_indices_descend( pn_x, pn_locs, *pn_npks );
+
+    for ( i = -1; i < *pn_npks; i++ ){
+        n_old_npks = *pn_npks;
+        *pn_npks = i+1;
+        for ( j = i+1; j < n_old_npks; j++ ){
+            n_dist =  pn_locs[j] - ( i == -1 ? -1 : pn_locs[i] ); // lag-zero peak of autocorr is at index -1
+            if ( n_dist > n_min_distance || n_dist < -n_min_distance )
+                pn_locs[(*pn_npks)++] = pn_locs[j];
+        }
+    }
+
+    // Resort indices longo ascending order
+    maxim_sort_ascend( pn_locs, *pn_npks );
+}
+
+void maxim_sort_ascend(int32_t *pn_x,int32_t n_size) 
+/**
+* \brief        Sort array
+* \par          Details
+*               Sort array in ascending order (insertion sort algorithm)
+*
+* \retval       None
+*/
+{
+    int32_t i, j, n_temp;
+    for (i = 1; i < n_size; i++) {
+        n_temp = pn_x[i];
+        for (j = i; j > 0 && n_temp < pn_x[j-1]; j--)
+            pn_x[j] = pn_x[j-1];
+        pn_x[j] = n_temp;
+    }
+}
+
+void maxim_sort_indices_descend(int32_t *pn_x, int32_t *pn_indx, int32_t n_size)
+/**
+* \brief        Sort indices
+* \par          Details
+*               Sort indices according to descending order (insertion sort algorithm)
+*
+* \retval       None
+*/ 
+{
+    int32_t i, j, n_temp;
+    for (i = 1; i < n_size; i++) {
+        n_temp = pn_indx[i];
+        for (j = i; j > 0 && pn_x[n_temp] > pn_x[pn_indx[j-1]]; j--)
+            pn_indx[j] = pn_indx[j-1];
+        pn_indx[j] = n_temp;
+    }
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/algorithm/algorithm.h	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,100 @@
+/** \file algorithm.h ******************************************************
+*
+* Project: MAXREFDES117#
+* Filename: algorithm.c
+* Description: This module is the heart rate/SpO2 calculation algorithm header file
+*
+* Revision History:
+*\n 1-18-2016 Rev 01.00 SK Initial release.
+*\n
+*
+* --------------------------------------------------------------------
+*
+* This code follows the following naming conventions:
+*
+*\n char              ch_pmod_value
+*\n char (array)      s_pmod_s_string[16]
+*\n float             f_pmod_value
+*\n int32_t           n_pmod_value
+*\n int32_t (array)   an_pmod_value[16]
+*\n int16_t           w_pmod_value
+*\n int16_t (array)   aw_pmod_value[16]
+*\n uint16_t          uw_pmod_value
+*\n uint16_t (array)  auw_pmod_value[16]
+*\n uint8_t           uch_pmod_value
+*\n uint8_t (array)   auch_pmod_buffer[16]
+*\n uint32_t          un_pmod_value
+*\n int32_t *         pn_pmod_value
+*
+* ------------------------------------------------------------------------- */
+/*******************************************************************************
+* Copyright (C) 2015 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.
+*******************************************************************************
+*/
+#ifndef ALGORITHM_H_
+#define ALGORITHM_H_
+
+#include "mbed.h"
+
+#define true 1
+#define false 0
+#define FS 100
+#define BUFFER_SIZE  (FS* 5) 
+#define HR_FIFO_SIZE 7
+#define MA4_SIZE  4 // DO NOT CHANGE
+#define HAMMING_SIZE  5// DO NOT CHANGE
+#define min(x,y) ((x) < (y) ? (x) : (y))
+
+const uint16_t auw_hamm[31]={ 41,    276,    512,    276,     41 }; //Hamm=  long16(512* hamming(5)');
+//SPO2table is computed as  -45.060*ratioAverage* ratioAverage + 30.354 *ratioAverage + 94.845 ;
+const uint8_t uch_spo2_table[184]={ 95, 95, 95, 96, 96, 96, 97, 97, 97, 97, 97, 98, 98, 98, 98, 98, 99, 99, 99, 99, 
+                            99, 99, 99, 99, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 
+                            100, 100, 100, 100, 99, 99, 99, 99, 99, 99, 99, 99, 98, 98, 98, 98, 98, 98, 97, 97, 
+                            97, 97, 96, 96, 96, 96, 95, 95, 95, 94, 94, 94, 93, 93, 93, 92, 92, 92, 91, 91, 
+                            90, 90, 89, 89, 89, 88, 88, 87, 87, 86, 86, 85, 85, 84, 84, 83, 82, 82, 81, 81, 
+                            80, 80, 79, 78, 78, 77, 76, 76, 75, 74, 74, 73, 72, 72, 71, 70, 69, 69, 68, 67, 
+                            66, 66, 65, 64, 63, 62, 62, 61, 60, 59, 58, 57, 56, 56, 55, 54, 53, 52, 51, 50, 
+                            49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 31, 30, 29, 
+                            28, 27, 26, 25, 23, 22, 21, 20, 19, 17, 16, 15, 14, 12, 11, 10, 9, 7, 6, 5, 
+                            3, 2, 1 } ;
+static  int32_t an_dx[ BUFFER_SIZE-MA4_SIZE]; // delta
+static  int32_t an_x[ BUFFER_SIZE]; //ir
+static  int32_t an_y[ BUFFER_SIZE]; //red
+
+
+void maxim_heart_rate_and_oxygen_saturation(uint32_t *pun_ir_buffer ,  int32_t n_ir_buffer_length, uint32_t *pun_red_buffer ,   int32_t *pn_spo2, int8_t *pch_spo2_valid ,  int32_t *pn_heart_rate , int8_t  *pch_hr_valid);
+void maxim_find_peaks( int32_t *pn_locs, int32_t *pn_npks,  int32_t *pn_x, int32_t n_size, int32_t n_min_height, int32_t n_min_distance, int32_t n_max_num );
+void maxim_peaks_above_min_height( int32_t *pn_locs, int32_t *pn_npks,  int32_t *pn_x, int32_t n_size, int32_t n_min_height );
+void maxim_remove_close_peaks( int32_t *pn_locs, int32_t *pn_npks,   int32_t  *pn_x, int32_t n_min_distance );
+void maxim_sort_ascend( int32_t *pn_x, int32_t n_size );
+void maxim_sort_indices_descend(  int32_t  *pn_x, int32_t *pn_indx, int32_t n_size);
+
+#endif /* ALGORITHM_H_ */
\ No newline at end of file

Binary file img/connection.png has changed

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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,302 @@
+/*******************************************************************************
+* Copyright (C) 2018 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.
+*******************************************************************************
+*/
+#include <events/mbed_events.h>
+#include "mbed.h"
+#include "max32630fthr.h"
+#include "USBSerial.h"
+#include "Adafruit_SSD1306.h"//include the adafruit library for the oled display
+#include "ble/BLE.h"//for bluetooth services
+#include "ble/Gap.h"
+#include "ble/services/HeartRateService.h"
+#include "algorithm.h"
+#include "MAX30102.h"
+
+
+#define MAX_BRIGHTNESS 255
+
+MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3);
+
+// Hardware serial port over DAPLink
+Serial daplink(USBTX, USBRX);          // Use USB debug probe for serial link
+Serial uart(P2_1, P2_0);
+
+//initialise the i2c port connections
+I2C i2c(P3_4, P3_5); // SDA, SCL
+
+Adafruit_SSD1306_I2c oled(i2c); //declare the oled display and its port connection type (I2C)
+
+
+//variables used for HRM service
+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;
+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;
+uint8_t hrmCounter;
+
+
+#ifdef TARGET_MAX32630FTHR
+PwmOut led1(LED_RED);    //initializes the pwm output that connects to the on board LED
+DigitalIn INT(P3_0);  //pin P30 connects to the interrupt output pin of the MAX30102
+#endif
+
+static HeartRateService *hrServicePtr;
+
+static EventQueue eventQueue(/* event count */ 16 * EVENTS_EVENT_SIZE);
+
+void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
+{
+    BLE::Instance().gap().startAdvertising(); // restart advertising
+}
+
+
+// Virtual serial port over USB
+USBSerial microUSB; 
+DigitalOut rLED(LED1);
+DigitalOut gLED(LED2);
+DigitalOut bLED(LED3);
+
+
+
+
+
+
+//functions for HRMSensor
+void checkHR(){
+    
+    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_MAX32630FTHR)
+        led1.write(1-(float)n_brightness/256);
+#endif
+
+
+    }
+    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);
+}
+
+void updateSensorValue() {
+    // Do blocking calls or whatever is necessary for sensor polling.
+    // In our case, we simply update the HRM measurement.
+
+    
+    checkHR();
+            
+    hrmCounter = n_heart_rate;
+        
+    hrServicePtr->updateHeartRate(hrmCounter);
+}
+
+void periodicCallback(void)
+{
+
+    if (BLE::Instance().getGapState().connected) {
+        eventQueue.call(updateSensorValue);
+    }
+}
+
+
+
+void onBleInitError(BLE &ble, ble_error_t error)
+{
+    (void)ble;
+    (void)error;
+   /* Initialization error handling should go here */
+}
+
+void printMacAddress()
+{
+    /* Print out device MAC address to the console*/
+    Gap::AddressType_t addr_type;
+    Gap::Address_t address;
+    BLE::Instance().gap().getAddress(&addr_type, address);
+    printf("DEVICE MAC ADDRESS: ");
+    for (int i = 5; i >= 1; i--){
+        printf("%02x:", address[i]);
+    }
+    printf("%02x\r\n", address[0]);
+}
+
+void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
+{
+    BLE&        ble   = params->ble;
+    ble_error_t error = params->error;
+
+    if (error != BLE_ERROR_NONE) {
+        onBleInitError(ble, error);
+        return;
+    }
+
+    if (ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
+        return;
+    }
+
+    ble.gap().onDisconnection(disconnectionCallback);
+
+    /* Setup primary service. */
+    hrServicePtr = new HeartRateService(ble, hrmCounter, HeartRateService::LOCATION_WRIST);//initially LOCATION_FINGER
+
+    /* Setup advertising. */
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_HEART_RATE_SENSOR);
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
+    ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
+    ble.gap().setAdvertisingInterval(1000); /* 1000ms */
+    ble.gap().startAdvertising();
+
+    printMacAddress();
+}
+
+void scheduleBleEventsProcessing(BLE::OnEventsToProcessCallbackContext* context) {
+    BLE &ble = BLE::Instance();
+    eventQueue.call(Callback<void()>(&ble, &BLE::processEvents));
+}
+
+public void HRMSensorInitialise(){
+        maxim_max30102_reset(); //resets the MAX30102
+
+    
+    //read and clear status register
+    maxim_max30102_read_reg(0,&uch_dummy);
+    
+    
+    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
+            
+    }
+    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); 
+    }
+
+public void HRMSensorTask(){
+    //task for checking the sensor value and sending to connected device
+        eventQueue.call_every(500, periodicCallback);
+ 
+        BLE &ble = BLE::Instance();
+        ble.onEventsToProcess(scheduleBleEventsProcessing);
+        ble.init(bleInitComplete);
+        eventQueue.dispatch_forever();
+    }
+
+public void OledDisplayTask(){
+    }//task for manipulating the oled display
+
+// main() runs in its own thread in the OS
+// (note the calls to Thread::wait below for delays)
+int main()
+{
+    int c;
+
+    daplink.printf("daplink serial port\r\n");
+    microUSB.printf("micro USB serial port\r\n");
+    rLED = LED_ON;
+    gLED = LED_ON;
+    bLED = LED_OFF;
+
+    rLED = LED_OFF;
+    HRMSensorInitialise();
+
+    while(1) {
+        OledDisplayTask();
+        HRMSensor();
+        Pork
+    }
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/max32630fthr.lib	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,1 @@
+http://developer.mbed.org/teams/MaximIntegrated/code/max32630fthr/#8f6e6a800f2f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#78474a5129e18e136cc7e872adbaa5b74fbb8f6a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/shields/TARGET_ST_BLUENRG.lib	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/ble-x-nucleo-idb0xa1/#b630517008bbe47592927cc8e5dfcd2e5b9de968

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/main.cpp	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,243 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <events/mbed_events.h>
+#include <mbed.h>
+#include "ble/BLE.h"
+#include "ble/Gap.h"
+#include "ble/services/HeartRateService.h"
+#include "algorithm.h"
+#include "MAX30102.h"
+
+#define MAX_BRIGHTNESS 255
+
+
+
+DigitalOut led2(LED2, 1);
+
+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;
+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;
+uint8_t hrmCounter;
+
+
+#ifdef TARGET_MAX32630FTHR
+PwmOut led1(LED_RED);    //initializes the pwm output that connects to the on board LED
+DigitalIn INT(P3_0);  //pin P30 connects to the interrupt output pin of the MAX30102
+#endif
+
+const static char     DEVICE_NAME[] = "HRM";
+static const uint16_t uuid16_list[] = {GattService::UUID_HEART_RATE_SERVICE};
+
+static HeartRateService *hrServicePtr;
+
+static EventQueue eventQueue(/* event count */ 16 * EVENTS_EVENT_SIZE);
+
+void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
+{
+    BLE::Instance().gap().startAdvertising(); // restart advertising
+}
+
+void checkHR(){
+    
+    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_MAX32630FTHR)
+        led1.write(1-(float)n_brightness/256);
+#endif
+
+
+    }
+    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);
+}
+
+void updateSensorValue() {
+    // Do blocking calls or whatever is necessary for sensor polling.
+    // In our case, we simply update the HRM measurement.
+
+    
+    checkHR();
+            
+    hrmCounter = n_heart_rate;
+        
+    hrServicePtr->updateHeartRate(hrmCounter);
+}
+
+void periodicCallback(void)
+{
+
+    if (BLE::Instance().getGapState().connected) {
+        eventQueue.call(updateSensorValue);
+    }
+}
+
+
+
+void onBleInitError(BLE &ble, ble_error_t error)
+{
+    (void)ble;
+    (void)error;
+   /* Initialization error handling should go here */
+}
+
+void printMacAddress()
+{
+    /* Print out device MAC address to the console*/
+    Gap::AddressType_t addr_type;
+    Gap::Address_t address;
+    BLE::Instance().gap().getAddress(&addr_type, address);
+    printf("DEVICE MAC ADDRESS: ");
+    for (int i = 5; i >= 1; i--){
+        printf("%02x:", address[i]);
+    }
+    printf("%02x\r\n", address[0]);
+}
+
+void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
+{
+    BLE&        ble   = params->ble;
+    ble_error_t error = params->error;
+
+    if (error != BLE_ERROR_NONE) {
+        onBleInitError(ble, error);
+        return;
+    }
+
+    if (ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
+        return;
+    }
+
+    ble.gap().onDisconnection(disconnectionCallback);
+
+    /* Setup primary service. */
+    hrServicePtr = new HeartRateService(ble, hrmCounter, HeartRateService::LOCATION_WRIST);//initially LOCATION_FINGER
+
+    /* Setup advertising. */
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_HEART_RATE_SENSOR);
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
+    ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
+    ble.gap().setAdvertisingInterval(1000); /* 1000ms */
+    ble.gap().startAdvertising();
+
+    printMacAddress();
+}
+
+void scheduleBleEventsProcessing(BLE::OnEventsToProcessCallbackContext* context) {
+    BLE &ble = BLE::Instance();
+    eventQueue.call(Callback<void()>(&ble, &BLE::processEvents));
+}
+
+int main()
+{
+    maxim_max30102_reset(); //resets the MAX30102
+
+    
+    //read and clear status register
+    maxim_max30102_read_reg(0,&uch_dummy);
+    
+    
+    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
+            
+    }
+    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); 
+    
+    
+    while(1)
+    {
+        
+        eventQueue.call_every(500, periodicCallback);
+ 
+        BLE &ble = BLE::Instance();
+        ble.onEventsToProcess(scheduleBleEventsProcessing);
+        ble.init(bleInitComplete);
+        
+        eventQueue.dispatch_forever();
+             
+        
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/mbed_app.json	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,16 @@
+{
+    "target_overrides": {
+        "K64F": {
+            "target.features_add": ["BLE"],
+            "target.extra_labels_add": ["ST_BLUENRG"]
+        },
+        "NUCLEO_F401RE": {
+            "target.features_add": ["BLE"],
+            "target.extra_labels_add": ["ST_BLUENRG"]
+        },
+        "DISCO_L475VG_IOT01A": {
+            "target.features_add": ["BLE"],
+            "target.extra_labels_add": ["ST_BLUENRG"]
+        }
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/module.json	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,16 @@
+{
+  "name": "ble-heartrate",
+  "version": "0.0.1",
+  "description": "BLE Heartreate example, building with yotta",
+  "licenses": [
+    {
+      "url": "https://spdx.org/licenses/Apache-2.0",
+      "type": "Apache-2.0"
+    }
+  ],
+  "dependencies": {
+    "ble": "^2.0.0"
+  },
+  "targetDependencies": {},
+  "bin": "./source"
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/readme.md	Thu Feb 13 14:55:02 2020 +0000
@@ -0,0 +1,66 @@
+# BLE Heart Rate Monitor
+
+This application transmits a heart rate value using the [Bluetooth SIG Heart Rate Profile](https://developer.bluetooth.org/TechnologyOverview/Pages/HRP.aspx). The heart rate value is provided by the application itself, not by a sensor, so that you don't have to get a sensor just to run the example.
+
+Technical details are better presented [in the mbed Classic equivalent of this example](https://developer.mbed.org/teams/Bluetooth-Low-Energy/code/BLE_HeartRate/).
+
+# Running the application
+
+## Requirements
+
+To see the heart rate information on your phone, download Panobike for [iOS](https://itunes.apple.com/gb/app/panobike/id567403997?mt=8) or [Android](https://play.google.com/store/apps/details?id=com.topeak.panobike&hl=en).
+
+You could also use a generic BLE scanners:
+
+- [nRF Master Control Panel](https://play.google.com/store/apps/details?id=no.nordicsemi.android.mcp) for Android.
+
+- [LightBlue](https://itunes.apple.com/gb/app/lightblue-bluetooth-low-energy/id557428110?mt=8) for iPhone.
+
+Hardware requirements are in the [main readme](https://github.com/ARMmbed/mbed-os-example-ble/blob/master/README.md).
+
+## Building instructions
+
+Building instructions for all samples are in the [main readme](https://github.com/ARMmbed/mbed-os-example-ble/blob/master/README.md).
+
+## Checking for success
+
+**Note:** Screens captures depicted below show what is expected from this example if the scanner used is *nRF Master Control Panel* version 4.0.5. If you encounter any difficulties consider trying another scanner or another version of nRF Master Control Panel. Alternative scanners may require reference to their manuals.
+
+1. Build the application and install it on your board as explained in the building instructions.
+1. Open the BLE scanner on your phone.
+1. Start a scan.
+
+    ![](img/start_scan.png)
+
+    **figure 1** How to start scan using nRF Master Control Panel 4.0.5
+
+1. Find your device; it should be named `HRM`.
+
+    ![](img/scan_result.png)
+
+    **figure 2** Scan results using nRF Master Control Panel 4.0.5
+
+1. Establish a connection with your device.
+
+    ![](img/connection.png)
+
+    **figure 3**  How to establish a connection using Master Control Panel 4.0.5
+
+1. Discover the services and the characteristics on the device. The *Heart Rate* service has the UUID `0x180D` and includes the *Heart Rate Measurement* characteristic which has the UUID `0x2A37`.
+
+    ![](img/discovery.png)
+
+    **figure 4** Representation of the Heart Rate service using Master Control Panel 4.0.5
+
+1. Register for the notifications sent by the *Heart Rate Measurement* characteristic.
+
+    ![](img/register_to_notifications.png)
+
+    **figure 5** How to register to notifications using Master Control Panel 4.0.5
+
+
+1. You should see the heart rate value change every half second. It begins at 100, goes up to 175 (in steps of 1), resets to 100 and so on.
+
+    ![](img/notifications.png)
+
+    **figure 6** Notifications view using Master Control Panel 4.0.5