有时能正常读取心率和血氧，有时数据是错的，比如心率会掉到40，血氧掉到80，需要跟进问题
This commit is contained in:
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-1
@@ -247,7 +247,7 @@ static void MX_GPIO_Init(void)
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/*Configure GPIO pin : MAX_INT_Pin */
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GPIO_InitStruct.Pin = MAX_INT_Pin;
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GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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GPIO_InitStruct.Pull = GPIO_PULLUP;
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HAL_GPIO_Init(MAX_INT_GPIO_Port, &GPIO_InitStruct);
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}
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@@ -27,7 +27,8 @@ SW_APPs/APP_blood.o: ../SW_APPs/APP_blood.c ../SW_APPs/APP_blood.h \
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../SW_APPs/windows.h \
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/Users/wuwenfeng/STM32CubeIDE/workspace_1.7.0/m3s/HW_Devices/lcd.h \
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/Users/wuwenfeng/STM32CubeIDE/workspace_1.7.0/m3s/HW_Devices/LCD.h \
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/Users/wuwenfeng/STM32CubeIDE/workspace_1.7.0/m3s/HW_Devices/iic.h
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/Users/wuwenfeng/STM32CubeIDE/workspace_1.7.0/m3s/HW_Devices/iic.h \
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../SW_APPs/FFT.h
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../SW_APPs/APP_blood.h:
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@@ -90,3 +91,5 @@ SW_APPs/APP_blood.o: ../SW_APPs/APP_blood.c ../SW_APPs/APP_blood.h \
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/Users/wuwenfeng/STM32CubeIDE/workspace_1.7.0/m3s/HW_Devices/LCD.h:
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/Users/wuwenfeng/STM32CubeIDE/workspace_1.7.0/m3s/HW_Devices/iic.h:
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../SW_APPs/FFT.h:
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@@ -1,5 +1,14 @@
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APP_blood.c:14:9:Max30102_reset 16 static
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APP_blood.c:20:6:MAX30102_Config 16 static
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APP_blood.c:43:6:max30102_read_fifo 16 static
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APP_blood.c:89:6:APP_blood_init 16 static
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APP_blood.c:98:6:APP_blood_loop 16 static
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APP_blood.c:18:9:Max30102_reset 16 static
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APP_blood.c:24:6:MAX30102_Config 16 static
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APP_blood.c:47:6:max30102_read_fifo 16 static
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APP_blood.c:93:6:APP_blood_init 16 static
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APP_blood.c:178:8:my_floor 24 static
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APP_blood.c:188:8:my_fmod 48 static
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APP_blood.c:202:8:XSin 64 static
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APP_blood.c:227:8:XCos 16 static
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APP_blood.c:233:5:qsqrt 32 static
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APP_blood.c:272:14:EE 40 static
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APP_blood.c:284:6:FFT 104 static
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APP_blood.c:341:5:find_max_num_index 32 static
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APP_blood.c:360:6:blood_data_translate 64 static
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APP_blood.c:432:6:APP_blood_loop 24 static
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+380
-6
@@ -4,13 +4,17 @@
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* Created on: 2021年8月21日
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* Author: wuwenfeng
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*/
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#include "math.h"
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#include "APP_blood.h"
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#include "iic.h"
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#include "FFT.h"
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window *blood_win;
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uint16_t fifo_red;
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uint16_t fifo_ir;
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char blood_str[64];
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uint16_t g_fft_index = 0; //fft输入输出下标
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uint8_t Max30102_reset(void)
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{
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char a=0x40;
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@@ -63,7 +67,7 @@ void max30102_read_fifo(void)
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fifo_red+=un_temp;
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un_temp=ach_i2c_data[2];
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un_temp>>=2;
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fifo_red+=un_temp;
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fifo_red+=un_temp;
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un_temp=ach_i2c_data[3];
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un_temp<<=14;
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@@ -73,7 +77,7 @@ void max30102_read_fifo(void)
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fifo_ir+=un_temp;
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un_temp=ach_i2c_data[5];
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un_temp>>=2;
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fifo_ir+=un_temp;
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fifo_ir+=un_temp;
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if(fifo_ir<=10000)
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{
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@@ -89,21 +93,391 @@ void max30102_read_fifo(void)
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void APP_blood_init(window *a_window)
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{
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blood_win=a_window;
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HAL_GPIO_WritePin(MAX_RD_GPIO_Port, MAX_RD_Pin, 0);
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HAL_GPIO_WritePin(MAX_IRD_GPIO_Port, MAX_IRD_Pin, 0);
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Max30102_reset();
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MAX30102_Config();
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//HAL_GPIO_WritePin(MAX_RD_GPIO_Port, MAX_RD_Pin, 0);
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/*
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for(int i = 0;i < 128;i++)
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{
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while(MAX30102_INTPin_Read()==0)
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{
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//读取FIFO
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max30102_read_fifo();
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}
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}
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*/
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}
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struct
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{
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float Hp ; //血红蛋白
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float HpO2; //氧合血红蛋白
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}g_BloodWave;//血液波形数据
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typedef enum
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{
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BLD_NORMAL, //正常
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BLD_ERROR, //侦测错误
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}BloodState;//血液状态
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typedef struct
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{
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int heart; //心率数据
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float SpO2; //血氧数据
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}BloodData;
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struct compx //定义一个复数结构
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{
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float real;
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float imag;
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};
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#define CORRECTED_VALUE 47 //标定血液氧气含量
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/*base value define-----------------------------------------------------------*/
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#define XPI (3.1415926535897932384626433832795)
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#define XENTRY (100)
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#define XINCL (XPI/2/XENTRY)
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#define PI 3.1415926535897932384626433832795028841971 //定义圆周率值
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/*Global data space ----------------------------------------------------------*/
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//正弦值对应表
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static const double XSinTbl[] = {
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0.00000000000000000 , 0.015707317311820675 , 0.031410759078128292 , 0.047106450709642665 , 0.062790519529313374 ,
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0.078459095727844944 , 0.094108313318514325 , 0.10973431109104528 , 0.12533323356430426 , 0.14090123193758267 ,
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0.15643446504023087 , 0.17192910027940955 , 0.18738131458572463 , 0.20278729535651249 , 0.21814324139654256 ,
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0.23344536385590542 , 0.24868988716485479 , 0.26387304996537292 , 0.27899110603922928 , 0.29404032523230400 ,
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0.30901699437494740 , 0.32391741819814940 , 0.33873792024529142 , 0.35347484377925714 , 0.36812455268467797 ,
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0.38268343236508978 , 0.39714789063478062 , 0.41151435860510882 , 0.42577929156507272 , 0.43993916985591514 ,
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0.45399049973954680 , 0.46792981426057340 , 0.48175367410171532 , 0.49545866843240760 , 0.50904141575037132 ,
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0.52249856471594880 , 0.53582679497899666 , 0.54902281799813180 , 0.56208337785213058 , 0.57500525204327857 ,
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0.58778525229247314 , 0.60042022532588402 , 0.61290705365297649 , 0.62524265633570519 , 0.63742398974868975 ,
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0.64944804833018377 , 0.66131186532365183 , 0.67301251350977331 , 0.68454710592868873 , 0.69591279659231442 ,
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0.70710678118654757 , 0.71812629776318881 , 0.72896862742141155 , 0.73963109497860968 , 0.75011106963045959 ,
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0.76040596560003104 , 0.77051324277578925 , 0.78043040733832969 , 0.79015501237569041 , 0.79968465848709058 ,
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0.80901699437494745 , 0.81814971742502351 , 0.82708057427456183 , 0.83580736136827027 , 0.84432792550201508 ,
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0.85264016435409218 , 0.86074202700394364 , 0.86863151443819120 , 0.87630668004386369 , 0.88376563008869347 ,
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0.89100652418836779 , 0.89802757576061565 , 0.90482705246601958 , 0.91140327663544529 , 0.91775462568398114 ,
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0.92387953251128674 , 0.92977648588825146 , 0.93544403082986738 , 0.94088076895422557 , 0.94608535882754530 ,
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0.95105651629515353 , 0.95579301479833012 , 0.96029368567694307 , 0.96455741845779808 , 0.96858316112863108 ,
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0.97236992039767667 , 0.97591676193874743 , 0.97922281062176575 , 0.98228725072868872 , 0.98510932615477398 ,
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0.98768834059513777 , 0.99002365771655754 , 0.99211470131447788 , 0.99396095545517971 , 0.99556196460308000 ,
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0.99691733373312796 , 0.99802672842827156 , 0.99888987496197001 , 0.99950656036573160 , 0.99987663248166059 ,
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1.00000000000000000 };
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BloodData g_blooddata = {0}; //血液数据存储
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#define FFT_N 512 //定义傅里叶变换的点数
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#define START_INDEX 4 //低频过滤阈值
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struct compx s1[FFT_N+16]; //FFT输入和输出：从S[1]开始存放，根据大小自己定义
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struct compx s2[FFT_N+16]; //FFT输入和输出：从S[1]开始存放，根据大小自己定义
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//向下取整
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double my_floor(double x)
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{
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double y=x;
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if( (*( ( (int *) &y)+1) & 0x80000000) != 0) //或者if(x<0)
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return (float)((int)x)-1;
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else
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return (float)((int)x);
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}
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//求余运算
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double my_fmod(double x, double y)
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{
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double temp, ret;
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if (y == 0.0)
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return 0.0;
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temp = my_floor(x/y);
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ret = x - temp * y;
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if ((x < 0.0) != (y < 0.0))
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ret = ret - y;
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return ret;
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}
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//正弦函数
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double XSin( double x )
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{
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int s = 0 , n;
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double dx , sx , cx;
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if( x < 0 )
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s = 1 , x = -x;
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x = my_fmod( x , 2 * XPI );
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if( x > XPI )
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s = !s , x -= XPI;
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if( x > XPI / 2 )
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x = XPI - x;
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n = (int)( x / XINCL );
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dx = x - n * XINCL;
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if( dx > XINCL / 2 )
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++n , dx -= XINCL;
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sx = XSinTbl[n];
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cx = XSinTbl[XENTRY-n];
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x = sx + dx*cx - (dx*dx)*sx/2
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- (dx*dx*dx)*cx/6
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+ (dx*dx*dx*dx)*sx/24;
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return s ? -x : x;
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}
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//余弦函数
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double XCos( double x )
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{
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return XSin( x + XPI/2 );
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}
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//开平方
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int qsqrt(int a)
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{
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uint32_t rem = 0, root = 0, divisor = 0;
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uint16_t i;
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for(i=0; i<16; i++)
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{
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root <<= 1;
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rem = ((rem << 2) + (a>>30));
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a <<= 2;
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divisor = (root << 1) + 1;
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if(divisor <= rem)
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{
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rem -= divisor;
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root++;
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}
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}
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return root;
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}
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/*********************************FFT*********************************
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快速傅里叶变换C函数
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函数简介：此函数是通用的快速傅里叶变换C语言函数，移植性强，以下部分不依
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赖硬件。此函数采用联合体的形式表示一个复数，输入为自然顺序的复
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数（输入实数是可令复数虚部为0），输出为经过FFT变换的自然顺序的
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复数
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使用说明：使用此函数只需更改宏定义FFT_N的值即可实现点数的改变，FFT_N的
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应该为2的N次方，不满足此条件时应在后面补0
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函数调用：FFT(s);
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时 间：2010-2-20
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版 本：Ver1.0
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参考文献：
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**********************************************************************/
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/*******************************************************************
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函数原型：struct compx EE(struct compx b1,struct compx b2)
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函数功能：对两个复数进行乘法运算
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输入参数：两个以联合体定义的复数a,b
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输出参数：a和b的乘积，以联合体的形式输出
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*******************************************************************/
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struct compx EE(struct compx a,struct compx b)
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{
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struct compx c;
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c.real=a.real*b.real-a.imag*b.imag;
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c.imag=a.real*b.imag+a.imag*b.real;
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return(c);
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}
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/*****************************************************************
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函数原型：void FFT(struct compx *xin,int N)
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函数功能：对输入的复数组进行快速傅里叶变换（FFT）
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输入参数：*xin复数结构体组的首地址指针，struct型
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*****************************************************************/
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void FFT(struct compx *xin)
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{
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int f,m,nv2,nm1,i,k,l,j=0;
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struct compx u,w,t;
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nv2=FFT_N/2; //变址运算，即把自然顺序变成倒位序，采用雷德算法
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nm1=FFT_N-1;
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for(i=0;i<nm1;i++)
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{
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if(i<j) //如果i<j,即进行变址
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{
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t=xin[j];
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xin[j]=xin[i];
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xin[i]=t;
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}
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k=nv2; //求j的下一个倒位序
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while(k<=j) //如果k<=j,表示j的最高位为1
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{
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j=j-k; //把最高位变成0
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k=k/2; //k/2，比较次高位，依次类推，逐个比较，直到某个位为0
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}
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j=j+k; //把0改为1
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}
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{ //FFT运算核，使用蝶形运算完成FFT运算
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int le,lei,ip;
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f=FFT_N;
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for(l=1;(f=f/2)!=1;l++) //计算l的值，即计算蝶形级数
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;
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for(m=1;m<=l;m++) // 控制蝶形结级数
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{ //m表示第m级蝶形，l为蝶形级总数l=log（2）N
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le=2<<(m-1); //le蝶形结距离，即第m级蝶形的蝶形结相距le点
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lei=le/2; //同一蝶形结中参加运算的两点的距离
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u.real=1.0; //u为蝶形结运算系数，初始值为1
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u.imag=0.0;
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w.real=XCos(PI/lei); //w为系数商，即当前系数与前一个系数的商
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w.imag=-XSin(PI/lei);
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for(j=0;j<=lei-1;j++) //控制计算不同种蝶形结，即计算系数不同的蝶形结
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{
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for(i=j;i<=FFT_N-1;i=i+le) //控制同一蝶形结运算，即计算系数相同蝶形结
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{
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ip=i+lei; //i，ip分别表示参加蝶形运算的两个节点
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t=EE(xin[ip],u); //蝶形运算，详见公式
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xin[ip].real=xin[i].real-t.real;
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xin[ip].imag=xin[i].imag-t.imag;
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xin[i].real=xin[i].real+t.real;
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xin[i].imag=xin[i].imag+t.imag;
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}
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u=EE(u,w); //改变系数，进行下一个蝶形运算
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}
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}
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}
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}
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//读取峰值
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int find_max_num_index(struct compx *data,int count)
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{
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int i=START_INDEX;
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int max_num_index = i;
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//struct compx temp=data[i];
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float temp = data[i].real;
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for(i=START_INDEX;i<count;i++)
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{
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if(temp < data[i].real)
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{
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temp = data[i].real;
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max_num_index = i;
|
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}
|
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}
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//printf("max_num_index=%d\r\n",max_num_index);
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return max_num_index;
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}
|
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|
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//血液信息转换
|
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void blood_data_translate(void)
|
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{
|
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float n_denom;
|
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uint16_t i;
|
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//直流滤波
|
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float dc_red =0;
|
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float dc_ir =0;
|
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float ac_red =0;
|
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float ac_ir =0;
|
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for (i=0 ; i<FFT_N ; i++ )
|
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{
|
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dc_red += s1[i].real ;
|
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dc_ir += s2[i].real ;
|
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}
|
||||
dc_red =dc_red/FFT_N ;
|
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dc_ir =dc_ir/FFT_N ;
|
||||
for (i=0 ; i<FFT_N ; i++ )
|
||||
{
|
||||
s1[i].real = s1[i].real - dc_red ;
|
||||
s2[i].real = s2[i].real - dc_ir ;
|
||||
}
|
||||
//移动平均滤波
|
||||
for(i = 1;i < FFT_N-1;i++)
|
||||
{
|
||||
n_denom= ( s1[i-1].real + 2*s1[i].real + s1[i+1].real);
|
||||
s1[i].real= n_denom/4.00;
|
||||
|
||||
n_denom= ( s2[i-1].real + 2*s2[i].real + s2[i+1].real);
|
||||
s2[i].real= n_denom/4.00;
|
||||
}
|
||||
//八点平均滤波
|
||||
for(i = 0;i < FFT_N-8;i++)
|
||||
{
|
||||
n_denom= ( s1[i].real+s1[i+1].real+ s1[i+2].real+ s1[i+3].real+ s1[i+4].real+ s1[i+5].real+ s1[i+6].real+ s1[i+7].real);
|
||||
s1[i].real= n_denom/8.00;
|
||||
|
||||
n_denom= ( s2[i].real+s2[i+1].real+ s2[i+2].real+ s2[i+3].real+ s2[i+4].real+ s2[i+5].real+ s2[i+6].real+ s2[i+7].real);
|
||||
s2[i].real= n_denom/8.00;
|
||||
}
|
||||
//开始变换显示
|
||||
g_fft_index = 0;
|
||||
//快速傅里叶变换
|
||||
FFT(s1);
|
||||
FFT(s2);
|
||||
//解平方
|
||||
for(i = 0;i < FFT_N;i++)
|
||||
{
|
||||
s1[i].real=sqrtf(s1[i].real*s1[i].real+s1[i].imag*s1[i].imag);
|
||||
s1[i].real=sqrtf(s2[i].real*s2[i].real+s2[i].imag*s2[i].imag);
|
||||
}
|
||||
//计算交流分量
|
||||
for (i=1 ; i<FFT_N ; i++ )
|
||||
{
|
||||
ac_red += s1[i].real ;
|
||||
ac_ir += s2[i].real ;
|
||||
}
|
||||
|
||||
//读取峰值点的横坐标 结果的物理意义为
|
||||
int s1_max_index = find_max_num_index(s1, 30);
|
||||
int s2_max_index = find_max_num_index(s2, 30);
|
||||
|
||||
|
||||
float Heart_Rate = 60.00 * ((100.0 * s1_max_index )/ 512.00);
|
||||
|
||||
g_blooddata.heart = Heart_Rate;
|
||||
|
||||
float R = (ac_ir*dc_red)/(ac_red*dc_ir);
|
||||
float sp02_num =-45.060*R*R+ 30.354 *R + 94.845;
|
||||
g_blooddata.SpO2 = sp02_num;
|
||||
|
||||
|
||||
}
|
||||
void APP_blood_loop()
|
||||
{
|
||||
max30102_read_fifo();
|
||||
|
||||
//标志位被使能时 读取FIFO
|
||||
g_fft_index=0;
|
||||
|
||||
while(g_fft_index < FFT_N)
|
||||
{
|
||||
while(MAX30102_INTPin_Read()==0)
|
||||
{
|
||||
//读取FIFO
|
||||
max30102_read_fifo(); //read from MAX30102 FIFO2
|
||||
//将数据写入fft输入并清除输出
|
||||
if(g_fft_index < FFT_N)
|
||||
{
|
||||
//将数据写入fft输入并清除输出
|
||||
s1[g_fft_index].real = fifo_red;
|
||||
s1[g_fft_index].imag= 0;
|
||||
s2[g_fft_index].real = fifo_ir;
|
||||
s2[g_fft_index].imag= 0;
|
||||
g_fft_index++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* for(int a=0;a<FFT_N;a++)
|
||||
{
|
||||
while(MAX30102_INTPin_Read());
|
||||
max30102_read_fifo(); //read from MAX30102 FIFO2
|
||||
s1[a].real = fifo_red;
|
||||
s1[a].imag= 0;
|
||||
s2[a].real = fifo_ir;
|
||||
s2[a].imag= 0;
|
||||
}
|
||||
*/
|
||||
//max30102_read_fifo();
|
||||
blood_data_translate();
|
||||
|
||||
sprintf(blood_str,"fifo_red:%d",fifo_red);
|
||||
LCD_ShowString(blood_win->x, blood_win->y+16, &blood_str, 16, WHITE, RED);
|
||||
sprintf(blood_str,"fifo_ir:%d",fifo_ir);
|
||||
LCD_ShowString(blood_win->x, blood_win->y+32, &blood_str, 16, WHITE, RED);
|
||||
sprintf(blood_str,"INT:%d",HAL_GPIO_ReadPin(MAX_INT_GPIO_Port, MAX_INT_Pin));
|
||||
|
||||
sprintf(blood_str,"heart:%04d",g_blooddata.heart);
|
||||
LCD_ShowString(blood_win->x, blood_win->y+48, &blood_str, 16, WHITE, RED);
|
||||
sprintf(blood_str,"SpO2:%2.2f ",g_blooddata.SpO2);
|
||||
LCD_ShowString(blood_win->x, blood_win->y+64, &blood_str, 16, WHITE, RED);
|
||||
sprintf(blood_str,"INT:%d",MAX30102_INTPin_Read());
|
||||
LCD_ShowString(blood_win->x, blood_win->y+80, &blood_str, 16, WHITE, RED);
|
||||
|
||||
|
||||
}
|
||||
|
||||
@@ -11,6 +11,8 @@
|
||||
#include "windows.h"
|
||||
#include "LCD.h"
|
||||
|
||||
#define MAX30102_INTPin_Read() HAL_GPIO_ReadPin(MAX_INT_GPIO_Port, MAX_INT_Pin)
|
||||
|
||||
#define MAX30102_Device_address 0xAE
|
||||
//register addresses
|
||||
#define REG_INTR_STATUS_1 0x00
|
||||
|
||||
@@ -0,0 +1,9 @@
|
||||
/*
|
||||
* FFT.C
|
||||
*
|
||||
* Created on: 2021年8月22日
|
||||
* Author: wuwenfeng
|
||||
*/
|
||||
|
||||
#include "FFT.h"
|
||||
|
||||
@@ -0,0 +1,14 @@
|
||||
/*
|
||||
* FFT.h
|
||||
*
|
||||
* Created on: 2021年8月22日
|
||||
* Author: wuwenfeng
|
||||
*/
|
||||
|
||||
#ifndef FFT_H_
|
||||
#define FFT_H_
|
||||
#include "main.h"
|
||||
|
||||
|
||||
|
||||
#endif /* FFT_H_ */
|
||||
@@ -91,8 +91,9 @@ PB12.GPIO_Speed=GPIO_SPEED_FREQ_HIGH
|
||||
PB12.Locked=true
|
||||
PB12.PinState=GPIO_PIN_SET
|
||||
PB12.Signal=GPIO_Output
|
||||
PB13.GPIOParameters=GPIO_Label
|
||||
PB13.GPIOParameters=GPIO_PuPd,GPIO_Label
|
||||
PB13.GPIO_Label=MAX_INT
|
||||
PB13.GPIO_PuPd=GPIO_PULLUP
|
||||
PB13.Locked=true
|
||||
PB13.Signal=GPIO_Input
|
||||
PB14.GPIOParameters=GPIO_Speed,PinState,GPIO_PuPd,GPIO_Label
|
||||
|
||||
Reference in New Issue
Block a user