基于HAL库使用cubemx配置，驱动MAX30102血氧传感器基础历程

使用的开发板是STM32F103C8T6最小系统

血氧传感器的是：

模块的原理图如下：

KEIL工程实现的功能概述：

把血氧传感器读取的数值全部显示到串口上面。其中在开发板上面定义的一个LED可以在血样传感其读取到正确的心率值以后跟随心跳一起跳动，感觉还是很炫酷的。
工程使用的是CUBEMX进行配置，需要配置IIC，一个用来处理MAX30102 INT引脚的输入IO，另一个是用来控制LED的输出IO。

project需要的配置如下：

使用两线下载口下载：

使用外部高速晶振作为时钟源：

打开IIC 通道一：

打开串口：

配置时钟树：

给工程起个名字：

勾上：

打开生成的KEIL工程：

把这四个文件搞进去：

file max30102.c


```c
/** \file max30102.c ******************************************************
*
* 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"
#include "i2c.h"uint8_t 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;//HAL_i2c_write(I2C_WRITE_ADDR, uch_addr,   1,  &uch_data);HAL_I2C_GetState(&hi2c1);//DMP库驱动  slave_addr 地址 发送时需要左移1位最后一位或上读写位HAL_I2C_Mem_Write(&hi2c1, I2C_WRITE_ADDR, uch_addr, 1, &uch_data, 1, HAL_MAX_DELAY);return 1;
}uint8_t 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
*/
{HAL_I2C_GetState(&hi2c1);//DMP库驱动  slave_addr 地址 发送时需要左移1位最后一位或上读写位HAL_I2C_Mem_Read(&hi2c1, I2C_READ_ADDR, uch_addr, 1, puch_data, 1, HAL_MAX_DELAY);//  HAL_i2c_read(I2C_READ_ADDR, uch_addr,   1,  puch_data);
//  char ch_i2c_data;
//  ch_i2c_data=uch_addr;
//  if(i2c.write(I2C_WRITE_ADDR, &ch_i2c_data, 1, true)!=0)
//    return 0;
//  if(i2c.read(I2C_READ_ADDR, &ch_i2c_data, 1, false)==0)
//  {
//    *puch_data=(uint8_t) ch_i2c_data;
//    return 1;
//  }
//  elsereturn 1;
}uint8_t 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 settingreturn 0;if(!maxim_max30102_write_reg(REG_INTR_ENABLE_2,0x00))return 0;if(!maxim_max30102_write_reg(REG_FIFO_WR_PTR,0x00))  //FIFO_WR_PTR[4:0]return 0;if(!maxim_max30102_write_reg(REG_OVF_COUNTER,0x00))  //OVF_COUNTER[4:0]return 0;if(!maxim_max30102_write_reg(REG_FIFO_RD_PTR,0x00))  //FIFO_RD_PTR[4:0]return 0;if(!maxim_max30102_write_reg(REG_FIFO_CONFIG,0x0f))  //sample avg = 1, fifo rollover=false, fifo almost full = 17return 0;if(!maxim_max30102_write_reg(REG_MODE_CONFIG,0x03))   //0x02 for Red only, 0x03 for SpO2 mode 0x07 multimode LEDreturn 0;if(!maxim_max30102_write_reg(REG_SPO2_CONFIG,0x27))  // SPO2_ADC range = 4096nA, SPO2 sample rate (100 Hz), LED pulseWidth (400uS)return 0;if(!maxim_max30102_write_reg(REG_LED1_PA,0x24))   //Choose value for ~ 7mA for LED1return 0;if(!maxim_max30102_write_reg(REG_LED2_PA,0x24))   // Choose value for ~ 7mA for LED2return 0;if(!maxim_max30102_write_reg(REG_PILOT_PA,0x7f))   // Choose value for ~ 25mA for Pilot LEDreturn 0;return 1;
}uint8_t 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;unsigned char ach_i2c_data[6];//read and clear status registermaxim_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;HAL_I2C_GetState(&hi2c1);//DMP库驱动  slave_addr 地址 发送时需要左移1位最后一位或上读写位HAL_I2C_Mem_Read(&hi2c1, I2C_READ_ADDR, REG_FIFO_DATA, 1, ach_i2c_data, 6, HAL_MAX_DELAY);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 1;
}uint8_t 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 0;elsereturn 1;
}

max30102.h


```c
/** \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"
#include "main.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 0xFFuint8_t maxim_max30102_init(void);
uint8_t maxim_max30102_read_fifo(uint32_t *pun_red_led, uint32_t *pun_ir_led);
uint8_t maxim_max30102_write_reg(uint8_t uch_addr, uint8_t uch_data);
uint8_t maxim_max30102_read_reg(uint8_t uch_addr, uint8_t *puch_data);
uint8_t maxim_max30102_reset(void);
/* MAX30102_H_ */
#endif

algorithm.c

/** \file algorithm.c ******************************************************
*
* 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"
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 } ;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 signalun_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 Averagefor(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 signalfor( 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_dxfor(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 detectorfor ( 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 calculationfor ( 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 signalmaxim_find_peaks( an_dx_peak_locs, &n_npks, an_dx, BUFFER_SIZE-HAMMING_SIZE, n_th1, 8, 5 );//peak_height, peak_distance, max_num_peaksn_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_locsn_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 MAfor(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 locationsn_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 SPO2for (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]); //redn_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 rawn_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]); // irn_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 rawn_nume=( n_y_ac *n_x_dc_max)>>7 ; //prepare X100 to preserve floating valuen_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 medianelsen_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 peaksn_width = 1;while (i+n_width < n_size && pn_x[i] == pn_x[i+n_width])    // find flat peaksn_width++;if (pn_x[i] > pn_x[i+n_width] && (*pn_npks) < 15 ){                            // find right edge of peakspn_locs[(*pn_npks)++] = i;        // for flat peaks, peak location is left edgei += n_width+1;}elsei += n_width;}elsei++;}
}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 -1if ( n_dist > n_min_distance || n_dist < -n_min_distance )pn_locs[(*pn_npks)++] = pn_locs[j];}}// Resort indices longo ascending ordermaxim_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;}
}

algorithm.h

/** \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"
#include "main.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]; //redvoid 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);/* ALGORITHM_H_ */
#endif

更改main中的内容：

包括文件，增加printf的定义：

#include "algorithm.h"#include "MAX30102.h"
/* USER CODE END Includes *//* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif/* __GNUC__ */PUTCHAR_PROTOTYPE
{HAL_UART_Transmit(&huart1 , (uint8_t *)&ch, 1, 0xFFFF);return ch;
}

定义全局变量和宏定义：

#define MAX_BRIGHTNESS 255uint32_t aun_ir_buffer[500]; //IR LED sensor dataint32_t n_ir_buffer_length;    //data lengthuint32_t aun_red_buffer[500];    //Red LED sensor dataint32_t n_sp02; //SPO2 valueint8_t ch_spo2_valid;   //indicator to show if the SP02 calculation is valid 指示SP02计算是否有效的指示器int32_t n_heart_rate;   //heart rate value 心率值
int8_t  ch_hr_valid;    //indicator to show if the heart rate calculation is valid显示心率计算是否有效的指示器uint8_t uch_dummy;

在main函数中增加变量的定义：

uint32_t un_min, un_max, un_prev_data;  //variables to calculate the on-board LED brightness that reflects the heartbeatsint i;int32_t n_brightness;float f_temp;

在main中增加初始化函数和MAX30102的寄存器配置：

maxim_max30102_reset(); //resets the MAX30102//read and clear status registermaxim_max30102_read_reg(0,&uch_dummy);maxim_max30102_init();  //initializes the MAX30102printf("初始化完成 \r\n");   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 100spsprintf("进入循环 \r\n");//read the first 500 samples, and determine the signal rangefor(i=0;i<n_ir_buffer_length;i++){// while(INT.read()==1);   //wait until the interrupt pin assertswhile(HAL_GPIO_ReadPin(INT_GPIO_Port,INT_Pin)==1){};   //wait until the interrupt pin assertsmaxim_max30102_read_fifo((aun_red_buffer+i), (aun_ir_buffer+i));  //read from MAX30102 FIFOif(un_min>aun_red_buffer[i])un_min=aun_red_buffer[i];    //update signal minif(un_max<aun_red_buffer[i])un_max=aun_red_buffer[i];    //update signal maxprintf("red=");printf("%i", aun_red_buffer[i]);printf(", ir=");printf("%i \r\n", aun_ir_buffer[i]);}un_prev_data=aun_red_buffer[i];printf("循环完成 \r\n");//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); printf("开始主循环 \r\n");

增加while(1)的内容：

        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 topfor(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 maxif(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);while(HAL_GPIO_ReadPin(INT_GPIO_Port,INT_Pin)==1){};   //wait until the interrupt pin assertsmaxim_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;}// pwmled.write(1-(float)n_brightness/256);//pwm control led brightnessif(n_brightness<120)  {HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_SET);}else{HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);}//send samples and calculation result to terminal program through UARTprintf("red=");printf("%i", aun_red_buffer[i]);printf(", ir=");printf("%i", aun_ir_buffer[i]);printf(", HR=%i, ", n_heart_rate); printf("HRvalid=%i, ", ch_hr_valid);printf("SpO2=%i, ", n_sp02);printf("SPO2Valid=%i\n\r\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);

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