pulsesensor心率计的51单片机源程序

ID:455993 · 发表于 2018-12-26 23:25

芯片stc12c5a
采用清翔电子出品的QX-mini51开发板来配合pulsesensor心率传感器完成脉搏采集和心率计算。
文件中一共有三个程序，分别为：
1.pulsesensor_STC12C5A：仅使用电脑显示心率值
2.pulsesensor_STC12C5A_LCD1602：使用LCD1602和电脑显示心率值
3.pulsesensor_STC12C5A _LCD12864：使用LCD12864和电脑显示心率值
注意：使用前务必将短路块J1，J5，J6拿掉，不然会严重影响信号从而导致心率值不准！
可以保留短路块J2，此时LED1会跟随心跳闪烁。

单片机源程序如下:

//******************************参数说明*********************************//
//MCU:STC12C5A60S2
//ADC PIN:P1.0
//SYSTEM CLOCK:11.0592MHz
//Baudrate:115200
//UART:P3.0 P3.1
//**********************************************************************//
//******************************使用说明*********************************//
//注意：使用前务必将短路块J1，J5，J6拿掉，不然会严重影响信号！
//可以保留短路块J2，此时LED1会跟随心跳闪烁
//**********************************************************************//
#include <STC12C5A60S2.h>
#include "stdio.h"
#include <LCD12864.h>
#define false 0
#define true 1
#define FOSC 11059200L //系统时钟
#define BAUD 115200 //波特率
#define T0MS (65536-FOSC/12/500) //500HZ in 12T MODE
#define ADC_POWER 0x80 //ADC POWER CONTROL BIT
#define ADC_FLAG 0x10 //ADC COMPLETE FLAG
#define ADC_START 0x08; //ADC START CONTROL BIT
#define ADC_SPEEDLL 0x00 //540 CLOCKS
#define ADC_SPEEDL 0x20 //360 CLOCKS
#define ADC_SPEEDH 0x40 //180 CLOCKS
#define ADC_SPEEDHH 0x60 //90 CLOCKS
#define ADC_MASK 0x01
void UART_init(void);
void ADC_init(unsigned char channel);
void T0_init(void);
void sendDataToProcessing(char symbol, int dat);
void UART_send(char dat);
unsigned char PulsePin = 0; // Pulse Sensor purple wire connected to analog pin 0(P1.0为AD口)
//sbit blinkPin = P2^0; // pin to blink led at each beat
//sbit fadePin = P2^3; // pin to do fancy classy fading blink at each beat
//sbit led1 = P2^1;
//sbit led2 = P2^2;
int fadeRate = 0; // used to fade LED on with PWM on fadePin
// these variables are volatile because they are used during the interrupt service routine!
volatile unsigned int BPM; // used to hold the pulse rate
volatile unsigned int Signal; // holds the incoming raw data
volatile unsigned int IBI = 600; // holds the time between beats, must be seeded!
volatile bit Pulse = false; // true when pulse wave is high, false when it's low
volatile bit QS = false; // becomes true when Arduoino finds a beat.
volatile int rate[10]; // array to hold last ten IBI values
volatile unsigned long sampleCounter = 0; // used to determine pulse timing
volatile unsigned long lastBeatTime = 0; // used to find IBI
volatile int Peak =512; // used to find peak in pulse wave, seeded
volatile int Trough = 512; // used to find trough in pulse wave, seeded
volatile int thresh = 512; // used to find instant moment of heart beat, seeded
volatile int amp = 100; // used to hold amplitude of pulse waveform, seeded
volatile bit firstBeat = true; // used to seed rate array so we startup with reasonable BPM
volatile bit secondBeat = false; // used to seed rate array so we startup with reasonable BPM
static unsigned char order=0;
unsigned char code ucStr1[] = "Pulsesensor test"; //显示信息1
unsigned char code ucStr2[] = " "; //显示信息2
unsigned char code ucStr3[] = " BPM: "; //显示信息3
unsigned char code ucStr4[] = "作者:anning86525"; //显示信息4
unsigned char DisBuff[4]={0};
void sys_init()
{
LCD12864_Init(); //初始化液晶
UART_init(); // we agree to talk fast!
ADC_init(PulsePin);
T0_init(); // sets up to read Pulse Sensor signal every 2mS
}
void main(void)
{
sys_init();
LCD12864_DisplayOneLine(0x80,ucStr1); //显示信息1
LCD12864_DisplayOneLine(0x90,ucStr2); //显示信息2
LCD12864_DisplayOneLine(0x88,ucStr3); //显示信息3
LCD12864_DisplayOneLine(0x98,ucStr4); //显示信息4
while(1)
{
sendDataToProcessing('S', Signal); // send Processing the raw Pulse Sensor data
if (QS == true){ // Quantified Self flag is true when arduino finds a heartbeat
fadeRate = 255; // Set 'fadeRate' Variable to 255 to fade LED with pulse
sendDataToProcessing('B',BPM); // send heart rate with a 'B' prefix
sendDataToProcessing('Q',IBI); // send time between beats with a 'Q' prefix
QS = false; // reset the Quantified Self flag for next time
LCD_disp_list_char(3,4,DisBuff);//在LCD12864上显示BPM
}
//ledFadeToBeat();
delay(138); // take a break 19.6ms
}
}
//void ledFadeToBeat(){
// fadeRate -= 15; // set LED fade value
// fadeRate = constrain(fadeRate,0,255); // keep LED fade value from going into negative numbers!
// analogWrite(fadePin,fadeRate); // fade LED
// }
void sendDataToProcessing(char symbol, int dat ){
putchar(symbol); // symbol prefix tells Processing what type of data is coming
printf("%d\r\n",dat); // the data to send culminating in a carriage return
}
void UART_init(void)
{
PCON &= 0x7f; //波特率不倍速
SCON = 0x50; //8位数据，可变波特率
BRT = 0xFD; //独立波特率产生器初值
AUXR |= 0x04; //时钟设置为1T模式
AUXR |= 0x01; //选择独立波特率产生器
AUXR |= 0x10; //启动波特率产生
}
char putchar(unsigned char dat)
{
TI=0;
SBUF=dat;
while(!TI);
TI=0;
return SBUF;
}
void T0_init(void){
// Initializes Timer0 to throw an interrupt every 2mS.
TMOD |= 0x01; //16bit TIMER
TL0=T0MS;
TH0=T0MS>>8;
TR0=1; //start Timer 0
ET0=1; //enable Timer Interrupt
EA=1; // MAKE SURE GLOBAL INTERRUPTS ARE ENABLED
}
void ADC_init(unsigned char channel)
{
P1ASF=ADC_MASK<<channel; //enable PlusePin as ADC INPUT
ADC_RES=0; //clear former ADC result
ADC_RESL=0; //clear former ADC result
AUXR1 |= 0x04; //adjust the format of ADC result
ADC_CONTR=channel|ADC_POWER|ADC_SPEEDLL|ADC_START; //power on ADC and start conversion
}
unsigned int analogRead(unsigned char channel)
{
unsigned int result;
ADC_CONTR &=!ADC_FLAG; //clear ADC FLAG
result=ADC_RES;
result=result<<8;
result+=ADC_RESL;
ADC_CONTR|=channel|ADC_POWER|ADC_SPEEDLL|ADC_START;
return result;
}
// Timer 0中断子程序，每2MS中断一次，读取AD值，计算心率值
void Timer0_rountine(void) interrupt 1
{
int N;
unsigned char i;
// keep a running total of the last 10 IBI values
unsigned int runningTotal = 0; // clear the runningTotal variable
EA=0; // disable interrupts while we do this
TL0=T0MS;
TH0=T0MS>>8; //reload 16 bit TIMER0
Signal = analogRead(PulsePin); // read the Pulse Sensor
sampleCounter += 2; // keep track of the time in mS with this variable
N = sampleCounter - lastBeatTime; // monitor the time since the last beat to avoid noise
// find the peak and trough of the pulse wave
if(Signal < thresh && N > (IBI/5)*3){ // avoid dichrotic noise by waiting 3/5 of last IBI
if (Signal < Trough){ // T is the trough
Trough = Signal; // keep track of lowest point in pulse wave
}
}
if(Signal > thresh && Signal > Peak){ // thresh condition helps avoid noise
Peak = Signal; // P is the peak
} // keep track of highest point in pulse wave
// NOW IT'S TIME TO LOOK FOR THE HEART BEAT
// signal surges up in value every time there is a pulse
if (N > 250){ // avoid high frequency noise
if ( (Signal > thresh) && (Pulse == false) && (N > (IBI/5)*3) ){
Pulse = true; // set the Pulse flag when we think there is a pulse
// blinkPin=0; // turn on pin 13 LED
IBI = sampleCounter - lastBeatTime; // measure time between beats in mS
lastBeatTime = sampleCounter; // keep track of time for next pulse
if(secondBeat){ // if this is the second beat, if secondBeat == TRUE
secondBeat = false; // clear secondBeat flag
for(i=0; i<=9; i++){ // seed the running total to get a realisitic BPM at startup
rate[i] = IBI;
}
}
if(firstBeat){ // if it's the first time we found a beat, if firstBeat == TRUE
firstBeat = false; // clear firstBeat flag
secondBeat = true; // set the second beat flag
EA=1; // enable interrupts again
return; // IBI value is unreliable so discard it
}
for(i=0; i<=8; i++){ // shift data in the rate array
rate[i] = rate[i+1]; // and drop the oldest IBI value
runningTotal += rate[i]; // add up the 9 oldest IBI values
}
rate[9] = IBI; // add the latest IBI to the rate array
runningTotal += rate[9]; // add the latest IBI to runningTotal
runningTotal /= 10; // average the last 10 IBI values
BPM = 60000/runningTotal; // how many beats can fit into a minute? that's BPM!
if(BPM>200)BPM=200; //限制BPM最高显示值
if(BPM<30)BPM=30; //限制BPM最低显示值
DisBuff[2] = BPM%10+48;//取个位数
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