STM32通过IIC驱动MAX30102心率血氧传感器
STM32F103单片机通过IIC控制MAX30102心率血氧传感器
MAX30102的VCC引脚连接STM32F103mini单片机的5伏引脚,GND连接5伏对应的GND,SCL连PC12,SDA连PC11,INT连PA5。MAX30102的其他引脚没有用到。
本代码能够正常接收MAX30102心率血氧传感器返回的red与ir的数值,能够比较正常计算出心率血氧数值。当心率或血氧值的计算结果有误时对应的变量值为-999。
本文最后有源工程文件的下载链接。
工程文件中使用的delay.h,sys.h,usart.h,myiic.h均为正点原子官方提供的STM32F103mini单片机对应的源码,未做改动。
因此本文只粘贴新加的max30102.h(max30102驱动代码头文件),max30102.c(max30102驱动代码),algorithm.h(max30102心率血氧算法函数头文件),algorithm.c(max30102心率血氧算法函数文件),以及main.c的测试样例
main.c文件
#include "delay.h"
#include "sys.h"
#include "usart.h"
#include "myiic.h"
#include "max30102.h"
#include "algorithm.h"#define MAX_BRIGHTNESS 255
#define START 100
#define DATA_LENGTH 500uint32_t aun_ir_buffer[DATA_LENGTH]; //IR LED sensor data
int32_t n_ir_buffer_length; //data length
uint32_t aun_red_buffer[DATA_LENGTH]; //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;int main(void){ 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;NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// 设置中断优先级分组2delay_init(); //延时函数初始化uart_init(115200); //串口初始化为115200IIC_Init(); maxim_max30102_reset(); //resets the MAX30102// initialize serial communication at 115200 bits per second://read and clear status registermaxim_max30102_read_reg(0,&uch_dummy);maxim_max30102_init(); //initializes the MAX30102n_brightness=0;un_min=0x3FFFF;un_max=0;n_ir_buffer_length=DATA_LENGTH; //buffer length of 100 stores 5 seconds of samples running at 100sps//read the first 500 samples, and determine the signal rangefor(i=0;i<n_ir_buffer_length;i++){while(PAin(5)==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=%i,", aun_red_buffer[i]);printf("ir=%i\r\n", 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); 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 topfor(i=START;i<DATA_LENGTH;i++){aun_red_buffer[i-START]=aun_red_buffer[i];aun_ir_buffer[i-START]=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<DATA_LENGTH;i++){un_prev_data=aun_red_buffer[i-1];while(PAin(5)==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;}//send samples and calculation result to terminal program through UART
// printf("red=%i,", aun_red_buffer[i]);
// printf(" ir=%i,", aun_ir_buffer[i]);}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(" HR=%i,", n_heart_rate); printf(" HRvalid=%i,", ch_hr_valid);printf(" SpO2=%i,", n_sp02);printf(" SPO2Valid=%i\r\n", ch_spo2_valid);}
}
max30102.h文件
/** \file max30102.h ******************************************************
*
* Project: MAXREFDES117#
* Filename: max30102.h
* Description: This module is an embedded controller driver header file for MAX30102
*
* Revision History:
*\n 1-18-2016 Rev 01.00 GL Initial release.
*\n
*
* --------------------------------------------------------------------
*
* 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 "stm32f10x.h"
#include "stdbool.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 0xFFbool maxim_max30102_init(void);
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_ */
max30102.c文件
/** \file max30102.cpp ******************************************************
*
* Project: MAXREFDES117#
* Filename: max30102.cpp
* Description: This module is an embedded controller driver for the MAX30102
*
* Revision History:
*\n 1-18-2016 Rev 01.00 GL Initial release.
*\n
*/#include "max30102.h"
#include "myiic.h"#define max30102_WR_address 0xAE
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
*/
{/* 第1步:发起I2C总线启动信号 */IIC_Start();/* 第2步:发起控制字节,高7bit是地址,bit0是读写控制位,0表示写,1表示读 */IIC_Send_Byte(max30102_WR_address | I2C_WR); /* 此处是写指令 *//* 第3步:发送ACK */if (IIC_Wait_Ack() != 0){goto cmd_fail; /* EEPROM器件无应答 */}/* 第4步:发送字节地址 */IIC_Send_Byte(uch_addr);if (IIC_Wait_Ack() != 0){goto cmd_fail; /* EEPROM器件无应答 */}/* 第5步:开始写入数据 */IIC_Send_Byte(uch_data);/* 第6步:发送ACK */if (IIC_Wait_Ack() != 0){goto cmd_fail; /* EEPROM器件无应答 */}/* 发送I2C总线停止信号 */IIC_Stop();return true; /* 执行成功 */cmd_fail: /* 命令执行失败后,切记发送停止信号,避免影响I2C总线上其他设备 *//* 发送I2C总线停止信号 */IIC_Stop();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
*/
{/* 第1步:发起I2C总线启动信号 */IIC_Start();/* 第2步:发起控制字节,高7bit是地址,bit0是读写控制位,0表示写,1表示读 */IIC_Send_Byte(max30102_WR_address | I2C_WR); /* 此处是写指令 *//* 第3步:发送ACK */if (IIC_Wait_Ack() != 0){goto cmd_fail; /* EEPROM器件无应答 */}/* 第4步:发送字节地址, */IIC_Send_Byte((uint8_t)uch_addr);if (IIC_Wait_Ack() != 0){goto cmd_fail; /* EEPROM器件无应答 */}/* 第6步:重新启动I2C总线。下面开始读取数据 */IIC_Start();/* 第7步:发起控制字节,高7bit是地址,bit0是读写控制位,0表示写,1表示读 */IIC_Send_Byte(max30102_WR_address | I2C_RD); /* 此处是读指令 *//* 第8步:发送ACK */if (IIC_Wait_Ack() != 0){goto cmd_fail; /* EEPROM器件无应答 */}/* 第9步:读取数据 */{*puch_data = IIC_Read_Byte(); /* 读1个字节 */IIC_NAck(); /* 最后1个字节读完后,CPU产生NACK信号(驱动SDA = 1) */}/* 发送I2C总线停止信号 */IIC_Stop();return true; /* 执行成功 返回data值 */cmd_fail: /* 命令执行失败后,切记发送停止信号,避免影响I2C总线上其他设备 *//* 发送I2C总线停止信号 */IIC_Stop();return false;
}bool maxim_max30102_init(void)
/**
* \brief Initialize the MAX30102
* \par Details
* This function initializes the MAX30102
*
* \param None
*
* \retval true on success
*/
{GPIO_InitTypeDef GPIO_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC,ENABLE);//使能PORTA,PORTC时钟GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);//关闭jtag,使能SWD,可以用SWD模式调试GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;//PA5GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //PA5设置成浮空输入,接MAX30102的INT数据转换是否完成的信号引脚GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA5if(!maxim_max30102_write_reg(REG_INTR_ENABLE_1, 0xc0)) // INTR settingreturn 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, 0x6f)) //sample avg = 8, fifo rollover=false, fifo almost full = 17return false;if(!maxim_max30102_write_reg(REG_MODE_CONFIG, 0x03)) //0x02 for Red only, 0x03 for SpO2 mode 0x07 multimode LEDreturn false;if(!maxim_max30102_write_reg(REG_SPO2_CONFIG, 0x2F)) // SPO2_ADC range = 4096nA, SPO2 sample rate (400 Hz), LED pulseWidth (411uS)return false;if(!maxim_max30102_write_reg(REG_LED1_PA, 0x17)) //Choose value for ~ 4.5mA for LED1return false;if(!maxim_max30102_write_reg(REG_LED2_PA, 0x17)) // Choose value for ~ 4.5mA for LED2return false;if(!maxim_max30102_write_reg(REG_PILOT_PA, 0x7f)) // Choose value for ~ 25mA for Pilot LEDreturn 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;uint8_t uch_temp;*pun_ir_led = 0;*pun_red_led = 0;maxim_max30102_read_reg(REG_INTR_STATUS_1, &uch_temp);maxim_max30102_read_reg(REG_INTR_STATUS_2, &uch_temp);/* 第1步:发起I2C总线启动信号 */IIC_Start();/* 第2步:发起控制字节,高7bit是地址,bit0是读写控制位,0表示写,1表示读 */IIC_Send_Byte(max30102_WR_address | I2C_WR); /* 此处是写指令 *//* 第3步:发送ACK */if (IIC_Wait_Ack() != 0){goto cmd_fail; /* EEPROM器件无应答 */}/* 第4步:发送字节地址, */IIC_Send_Byte((uint8_t)REG_FIFO_DATA);if (IIC_Wait_Ack() != 0){goto cmd_fail; /* EEPROM器件无应答 */}/* 第6步:重新启动I2C总线。下面开始读取数据 */IIC_Start();/* 第7步:发起控制字节,高7bit是地址,bit0是读写控制位,0表示写,1表示读 */IIC_Send_Byte(max30102_WR_address | I2C_RD); /* 此处是读指令 *//* 第8步:发送ACK */if (IIC_Wait_Ack() != 0){goto cmd_fail; /* EEPROM器件无应答 */}un_temp = IIC_Read_Byte();IIC_Ack();un_temp <<= 16;*pun_red_led += un_temp;un_temp = IIC_Read_Byte();IIC_Ack();un_temp <<= 8;*pun_red_led += un_temp;un_temp = IIC_Read_Byte();IIC_Ack();*pun_red_led += un_temp;un_temp = IIC_Read_Byte();IIC_Ack();un_temp <<= 16;*pun_ir_led += un_temp;un_temp = IIC_Read_Byte();IIC_Ack();un_temp <<= 8;*pun_ir_led += un_temp;un_temp = IIC_Read_Byte();IIC_Ack();*pun_ir_led += un_temp;*pun_red_led &= 0x03FFFF; //Mask MSB [23:18]*pun_ir_led &= 0x03FFFF; //Mask MSB [23:18]/* 发送I2C总线停止信号 */IIC_Stop();return true;
cmd_fail: /* 命令执行失败后,切记发送停止信号,避免影响I2C总线上其他设备 *//* 发送I2C总线停止信号 */IIC_Stop();return false;
}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;elsereturn true;
}
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 "stm32f10x.h"
#include "stdbool.h"#define true 1
#define false 0
#define FS 50//sampling frequency
#define BUFFER_SIZE (FS* 3)
#define MA4_SIZE 4// DONOT CHANGE
#define min(x,y) ((x) < (y) ? (x) : (y))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 *n_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 *n_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_ */
algorithm.c
/** \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"//uch_spo2_table is approximated 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 an_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 an_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;int32_t k, n_i_ratio_count;int32_t i, n_exact_ir_valley_locs_count, n_middle_idx;int32_t n_th1, n_npks;int32_t an_ir_valley_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 ;// calculates DC mean and subtract DC from irun_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 ;// remove DC and invert signal so that we can use peak detector as valley detectorfor (k = 0 ; k < n_ir_buffer_length ; k++ )an_x[k] = -1 * (pun_ir_buffer[k] - un_ir_mean) ;// 4 pt Moving Averagefor(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]) / (int)4;}// calculate thresholdn_th1 = 0;for ( k = 0 ; k < BUFFER_SIZE ; k++){n_th1 += an_x[k];}n_th1 = n_th1 / ( BUFFER_SIZE);if( n_th1 < 30) n_th1 = 30; // min allowedif( n_th1 > 60) n_th1 = 60; // max allowedfor ( k = 0 ; k < 15; k++) an_ir_valley_locs[k] = 0;// since we flipped signal, we use peak detector as vSalley detectormaxim_find_peaks( an_ir_valley_locs, &n_npks, an_x, BUFFER_SIZE, n_th1, 4, 15 );//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_ir_valley_locs[k] - an_ir_valley_locs[k - 1] ) ;n_peak_interval_sum = n_peak_interval_sum / (n_npks - 1);*pn_heart_rate = (int32_t)( (FS * 60) / n_peak_interval_sum );*pch_hr_valid = 1;}else{*pn_heart_rate = -999; // unable to calculate because # of peaks are too small*pch_hr_valid = 0;}// load raw value again for SPO2 calculation : RED(=y) and IR(=X)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 = n_npks;//using exact_ir_valley_locs , find ir-red DC andir-red AC for SPO2 calibration an_ratio//finding AC/DC maximum of rawn_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_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 an_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_ir_valley_locs[k + 1] - an_ir_valley_locs[k] > 3){for (i = an_ir_valley_locs[k]; i < an_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_ir_valley_locs[k + 1]] - an_y[an_ir_valley_locs[k] ] ) * (n_y_dc_max_idx - an_ir_valley_locs[k]); //redn_y_ac = an_y[an_ir_valley_locs[k]] + n_y_ac / (an_ir_valley_locs[k + 1] - an_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_ir_valley_locs[k + 1]] - an_x[an_ir_valley_locs[k] ] ) * (n_x_dc_max_idx - an_ir_valley_locs[k]); // irn_x_ac = an_x[an_ir_valley_locs[k]] + n_x_ac / (an_ir_valley_locs[k + 1] - an_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++;}}}// choose median value since PPG signal may varies from beat to beatmaxim_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 an_ratio is out of range*pch_spo2_valid = 0;}
}void maxim_find_peaks( int32_t *pn_locs, int32_t *n_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, n_npks, pn_x, n_size, n_min_height );maxim_remove_close_peaks( pn_locs, n_npks, pn_x, n_min_distance );*n_npks = min( *n_npks, n_max_num );
}void maxim_peaks_above_min_height( int32_t *pn_locs, int32_t *n_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, riseFound = 0, holdOff1 = 0, holdOff2 = 0, holdOffThresh = 4;*n_npks = 0;while (i < n_size - 1){if (holdOff2 == 0){if (pn_x[i] > n_min_height && pn_x[i] > pn_x[i - 1]) // find left edge of potential peaks{riseFound = 1;}if (riseFound == 1){if ((pn_x[i] < n_min_height) && (holdOff1 < holdOffThresh)) // if false edge{riseFound = 0;holdOff1 = 0;}else{if (holdOff1 == holdOffThresh){if ((pn_x[i] < n_min_height) && (pn_x[i - 1] >= n_min_height)){if ((*n_npks) < 15 ){pn_locs[(*n_npks)++] = i; // peak is right edge}holdOff1 = 0;riseFound = 0;holdOff2 = 8;}}else{holdOff1 = holdOff1 + 1;}}}}else{holdOff2 = holdOff2 - 1;}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 -1if ( n_dist > n_min_distance || n_dist < -n_min_distance )pn_locs[(*pn_npks)++] = pn_locs[j];}}// Resort indices int32_to 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;}
}
点这里:源工程文件下载地址
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