Yu anning
the MAX30102 driver for LPC1768 board
Revision 0:82a90765baa2, committed 2018-10-26
- Comitter:
- anning865
- Date:
- Fri Oct 26 10:30:22 2018 +0000
- Commit message:
- The MAX30102 driver for LPC1768
Changed in this revision
diff -r 000000000000 -r 82a90765baa2 MAX30102/MAX30102.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MAX30102/MAX30102.cpp Fri Oct 26 10:30:22 2018 +0000
@@ -0,0 +1,216 @@
+/** \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"
+
+I2C i2c(p9,p10);//p9-sda,p10-scl
+
+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;
+}
diff -r 000000000000 -r 82a90765baa2 MAX30102/MAX30102.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MAX30102/MAX30102.h Fri Oct 26 10:30:22 2018 +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
diff -r 000000000000 -r 82a90765baa2 algorithm/algorithm.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/algorithm/algorithm.cpp Fri Oct 26 10:30:22 2018 +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;
+ }
+}
+
diff -r 000000000000 -r 82a90765baa2 algorithm/algorithm.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/algorithm/algorithm.h Fri Oct 26 10:30:22 2018 +0000
@@ -0,0 +1,100 @@
+/** \file algorithm.h ******************************************************
+*
+* Project: MAXREFDES117#
+* Filename: algorithm.h
+* 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)');
+//uch_spo2_table 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
diff -r 000000000000 -r 82a90765baa2 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Oct 26 10:30:22 2018 +0000
@@ -0,0 +1,212 @@
+/** \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
+#define false 0
+#define true 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;
+
+Serial pc(USBTX, USBRX); //initializes the serial port
+DigitalIn INT(p8); //pin P8 connects to the interrupt output pin of the MAX30102
+PwmOut led(LED1); //initializes the pwm output that connects to the on board LED
+
+// 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)//just to determine the brightness of LED according to the deviation of adjacent two AD 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;
+ }
+
+ led.write(1-(float)n_brightness/256);//pwm control led brightness
+
+ //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);
+ }
+}
+
\ No newline at end of file
diff -r 000000000000 -r 82a90765baa2 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Oct 26 10:30:22 2018 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/mbed_official/code/mbed/builds/e95d10626187 \ No newline at end of file