Santoshhh
Newbie level 6
Hi all,
First of all, I let you know that I am a beginner in PIC programming. I am designing a Digital Blood Pressure Monitor and a Digital thermometer and also the wireless transmission of its output using a GSM MODEM. For the case of software part I am using MPLAB IDE and HITEC C compiler. I am writng the code in C language. After getting some problems during coding, I started surfing for help. I got a link to Cornell University's Project. I also found a code there. They have used ATMEL MEGA32 microcontroller. I am totally blank about how to code in that microcontroller. So, I could not understand some parts of the code, especially the Interrupt and the ADC thing and some of the registers. I am posting the code below. I would be so grateful if somebody changes the code to make it compatible to use with the PIC16F877A microcontroller. I know I am asking a lot to do but please I need it.
The link to the code is:
https://people.ece.cornell.edu/land...ects/s2005/ww56_ws62/Final Project Web/code.c
If link not available, the code is:
First of all, I let you know that I am a beginner in PIC programming. I am designing a Digital Blood Pressure Monitor and a Digital thermometer and also the wireless transmission of its output using a GSM MODEM. For the case of software part I am using MPLAB IDE and HITEC C compiler. I am writng the code in C language. After getting some problems during coding, I started surfing for help. I got a link to Cornell University's Project. I also found a code there. They have used ATMEL MEGA32 microcontroller. I am totally blank about how to code in that microcontroller. So, I could not understand some parts of the code, especially the Interrupt and the ADC thing and some of the registers. I am posting the code below. I would be so grateful if somebody changes the code to make it compatible to use with the PIC16F877A microcontroller. I know I am asking a lot to do but please I need it.
The link to the code is:
https://people.ece.cornell.edu/land...ects/s2005/ww56_ws62/Final Project Web/code.c
If link not available, the code is:
Code:
#include <Mega32.h>
#include <delay.h>
#asm
.equ __lcd_port = 0x15
#endasm
#include <math.h>
#include <lcd.h>
#include <stdio.h>
#include <stdlib.h>
//define states for motor control
#define startState 0
#define inflate1State 1
#define inflate2State 2
#define deflateState 3
#define displayState 4
#define resetState 5
//define states for Measure control
#define Sys_Measure 6
#define Sys_Cal 7
#define Rate_Measure 8
#define dias_Measure 9
#define dias_Cal 10
#define LCDwidth 16
void initialize(void);
//declare functions for motor control
void start_state(void);
void inflate1_state(void);
void inflate2_state(void);
void deflatestate(void);
void display_state(void);
void reset_state(void);
//declare all functions for measuring control
void pressuremeasure(void);
void sysmeasure(void);
void syscal(void);
void ratemeasure(void);
void diasmeasure(void);
void diascal(void);
//declare variable for motor controls
unsigned char Maybe0,Maybe1,Maybe2,countlcd;
unsigned char currentState;
unsigned int timepress0, timepress1, timepress2, timelcd;
char lcd_output[17];
//declare variable for measuring and calculating value
float DC_gain;
unsigned char meas_state;
unsigned int timing, timerate, timerun_dias, timecount, timedeflate, timedisplay;
float maxpressure, pressure,accum_data, press_data;
unsigned char count, stop_count;
//ADC data variabls
float Vref;
unsigned char data;
float adc_data, former;
//define counter
unsigned char sys_count,count_average, countpulse;
//declare rate measure variable
float time_pulse,pulse_period, total_pulse_period, pulse_per_min;
//declare systolic and diastolic variable
float systolic, diastolic;
//declare all the threshold values
float TH_sys, TH_rate, TH_dias;
//***********************************************
//timer 0 compare ISR
interrupt [TIM0_COMP] void timer0_compare(void)
{
if(~PINB & 0x01) timepress0++;
if(~PINB & 0x02) timepress1++;
if(~PINB & 0x04) timepress2++;
timecount++;
timedeflate++;
//Decrement each time tast if they are not already zero
//timing for sampling data at every 40 msec
if(timing>0) --timing;
//-----------------------------------------------------
//run time for different tasks
//run timerate for measuring heart rate
if(timerate<6000) ++timerate;
//run timerun_dias
if(timerun_dias<2000) ++timerun_dias;
//if(countlcd) timelcd++;
//run time for the display
if(timedisplay<2000) ++timedisplay;
}
//***********************************************
// ADC Interrupt
//**********************************************************
interrupt [ADC_INT] void adc_complete(void)
{
data = ADCH;
//then calculate adc_data into float;
adc_data = (float)(((float)data)/256*Vref);
//if signal is above threshold, go to calculate systolic pressure
if(meas_state ==Sys_Measure)
{
if(former<=TH_sys && adc_data>TH_sys)
sys_count++;
former = adc_data;
}
//-----------------------------------------------------------
else if(meas_state==Sys_Cal)
{
if(count<4)
{
accum_data=accum_data+adc_data;
count++;
}
if(count==4)
{
press_data=accum_data/4;
systolic = (press_data/DC_gain)*9375;//calculate from adc_data
meas_state = Rate_Measure;
countpulse=0;
former = 2.4; //set the initial point for rate measuring
count_average=0;
}
}
//----------------------------------------------------------
else if(meas_state==Rate_Measure)
{
if(count_average<5)
{
if(former<TH_rate && adc_data>TH_rate && countpulse==0)
{
timerate=0;
countpulse=1;
former=adc_data;
}
if(former<TH_rate && adc_data>TH_rate && countpulse==1)
{
total_pulse_period=total_pulse_period+timerate;
timerate=0;
count_average++; //finish reading one period
}
}//count_average
former=adc_data;
}// else if(meas_state=Rate_Measure)
//-------------------------------------------------------------
else if(meas_state==dias_Measure)
{
if(timerun_dias<2000)
{
if(adc_data>TH_dias)
{ timerun_dias=0; //reset time if the signal
//is still greater than threshold (so it will never reach 1999)
//if it doesn't reset,the time will stuck at 1999
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("Dias measure");
}
}
if(timerun_dias>=2000)
{
meas_state = dias_Cal;//if done go back to Sys_Measure to be ready for next opt
}
}
//-------------------------------------------------------------
else if(meas_state==dias_Cal)
{
diastolic = (adc_data/DC_gain)*9375;//calculate from adc_data
meas_state = Sys_Measure;
currentState = displayState;
//open valve
PORTD=0;
}
timing = 40;//set time for another conversion
}// end of ADC interrupt
//***********************************************************
void main(void)
{
initialize();
while(1)
{
switch(currentState)
{
case startState:
start_state();
break;
case inflate1State:
inflate1_state();
break;
case inflate2State:
inflate2_state();
break;
case deflateState:
deflatestate();
break;
case displayState:
display_state();
break;
case resetState:
reset_state();
break;
}
}
}
//***********************************************
void start_state(void)
{ sys_count=0;
pressure = 0;
accum_data=0;
press_data=0;
count=0;
stop_count=0;
maxpressure = 160;
meas_state = Sys_Measure;
former=TH_sys-0.01;
timerun_dias=0;
time_pulse=0;
timerate=0;
timing=40;
total_pulse_period=0;
systolic=0;
diastolic=0;
pulse_per_min=0;
sys_count=0;
count_average=0;
countpulse=0;
if((~PINB & 0x01) && (timepress0 > 30)) Maybe0 = 1;
if(Maybe0 && (PINB == 0xff))
{
countlcd = 1;
timelcd = 0;
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("Inflating");
currentState = inflate1State;
Maybe0 = 0;
timepress0 = 0;
timecount=0;
//turn on motor and close the valve
PORTD=0x03;
//activate ADC
}
}
//***********************************************
void inflate1_state(void)
{
if(timecount>=200)
{
timecount=0;
sprintf(lcd_output,"%-i",(int)pressure);
lcd_gotoxy(0,1);
lcd_puts(lcd_output);
}
if((~PINB & 0x02) && (timepress1 > 30)) Maybe1 = 1;
if(Maybe1 && (PINB == 0xff))
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("Emergency Stop");
sprintf(lcd_output,"%-i",(int)pressure);
lcd_gotoxy(0,1);
lcd_puts(lcd_output);
//turn off motor and open the valve
PORTD=0;
currentState = resetState;
Maybe1 = 0;
timepress1 = 0;
countlcd = 0;
}
else
{
currentState = inflate2State;
}
}
//***********************************************
void inflate2_state(void)
{
ADMUX=0b00100001;//choose ADC1 for reading DC
//enable ADC and set prescaler to 1/128*16MHz=125,000
//and uncheck interupt enable
//and start a conversion
ADCSR = 0b11000111;
data= ADCH;
adc_data = (float)(((float)data)/256*Vref);
pressure= (adc_data/DC_gain)*9375;
if(pressure>=maxpressure) stop_count++;
else stop_count = 0;
if(stop_count>=5)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("Deflating");
sprintf(lcd_output,"%-i",(int)pressure);
lcd_gotoxy(0,1);
lcd_puts(lcd_output);
//turn off motor but keep the valve
PORTD = 0x02;
delay_ms(1000);
currentState = deflateState;
timedeflate = 0;
sprintf(lcd_output,"%-i",(int)pressure);
lcd_gotoxy(0,1);
lcd_puts(lcd_output);
}
else
{
currentState = inflate1State;
}
}
//***********************************************
void deflatestate(void)
{
/*if(timedeflate >= 1900)
{
PORTD = 0;
if(timedeflate >= 2000)
{
PORTD = 0x02;
timedeflate = 0;
}
}*/
if((~PINB & 0x02) && (timepress1 > 30)) Maybe1 = 1;
if(Maybe1 && (PINB == 0xff))
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("Emergency Stop");
sprintf(lcd_output,"%-i",(int)pressure);
lcd_gotoxy(0,1);
lcd_puts(lcd_output);
//turn off motor and open the valve
PORTD=0;
currentState = resetState;
Maybe1 = 0;
timepress1 = 0;
}
//if(done) --> Display state
if(currentState==deflateState) pressuremeasure(); //if still deflating, measure everything
}
//***********************************************
void display_state(void)
{
if(timedisplay<=1000)
{
if(timecount>=200)
{
lcd_clear();
timecount=0;
lcd_gotoxy(0,0);
lcd_putsf("Sys");
lcd_gotoxy(7,0);
lcd_putsf("Dias");
lcd_gotoxy(15,0);
lcd_putsf("HR");
sprintf(lcd_output,"%-i",(int)systolic);
lcd_gotoxy(0,1);
lcd_puts(lcd_output);
sprintf(lcd_output,"%-i",(int)diastolic);
lcd_gotoxy(7,1);
lcd_puts(lcd_output);
sprintf(lcd_output,"%-i",(int)pulse_per_min);
lcd_gotoxy(14,1);
lcd_puts(lcd_output);
}
}
else if (timedisplay>1000&&timedisplay<2000)
{
if(timecount>=200)
{ lcd_clear();
timecount=0;
lcd_gotoxy(0,0);
lcd_putsf("Black: Resume");
}
}
else
{
timedisplay=0;
}
if((~PINB & 0x04) && (timepress2 > 30)) Maybe2 = 1;
if(Maybe2 && (PINB == 0xff))
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("White: Start");
lcd_gotoxy(0,1);
lcd_putsf("Grey: Stop");
currentState = startState;
timepress2 = 0;
Maybe2=0;
systolic=0;
diastolic=0;
pulse_per_min=0;
}
}
//***********************************************
void reset_state(void)
{
if(timedisplay<=1000)
{
if(timecount>=200)
{ timecount=0;
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("Emergency Stop");
}
}
else if (timedisplay>1000&&timedisplay<2000)
{
if(timecount>=200)
{ lcd_clear();
timecount=0;
lcd_gotoxy(0,0);
lcd_putsf("Black: Resume");
}
}
else
{
timedisplay=0;
}
if((~PINB & 0x04) && (timepress2 > 30)) Maybe2 = 1;
if(Maybe2 && (PINB == 0xff))
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("White: Start");
lcd_gotoxy(0,1);
lcd_putsf("Grey: Stop");
currentState = startState;
timepress2 = 0;
Maybe2=0;
}
}
//***********************************************
// Function to measure everything
//------------------------------------------------
void pressuremeasure(void)
{
switch (meas_state)
{
case Sys_Measure:
if(timing==0) sysmeasure(); //sampling signal at 40msec
break;
case Sys_Cal:
if(timing==0) syscal();
break;
case Rate_Measure:
if(timing==0) ratemeasure();
break;
case dias_Measure:
diasmeasure();
break;
case dias_Cal:
diascal();
break;
} //switch
}//pressuremeasure
//*********************************************************
void sysmeasure(void)
{
if(timing==0)
{ADMUX = 0b00100000; //choose ADC0 for reading AC
//enable ADC and set prescaler to 1/128*16MHz=125,000
//and set interupt enable
//and start a conversion
ADCSR = 0b11001111;
}
if(sys_count>=6)
{
meas_state = Sys_Cal;
timecount=0;
}
if(timecount>=200)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("Measuring");
timecount=0;
}
}
//***********************************************************
//this function is to calculate systolic pressure
void syscal(void)
{
ADMUX=0b00100001;//choose ADC1 for reading DC
//enable ADC and set prescaler to 1/128*16MHz=125,000
//and set interupt enable
//and start a conversion
ADCSR = 0b11001111;
if(timecount>=200)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("Sys Cal");
timecount=0;
}
}//syscal
//************************************************************
void ratemeasure(void)
{
ADMUX=0b00100000; //choose ADC0 for reading AC
//enable ADC and set prescaler to 1/128*16MHz=125,000
//and set interupt enable
//and start a conversion
ADCSR = 0b11001111;
//calculate the mean of pulse rate
if(count_average==5)
{
pulse_period = total_pulse_period/5000;
pulse_per_min= 60/pulse_period;
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("Pulse Rate");
sprintf(lcd_output,"%-i",(int)pulse_per_min);
lcd_gotoxy(0,1);
lcd_puts(lcd_output);
meas_state = dias_Measure;
//then set timerun_dias=0
//also reset count_average for the next operation
count_average=0;
timerun_dias=0;
}
}
//************************************************************
void diasmeasure(void)
{
ADMUX=0b00100000;//choose ADC1 for reading AC
//enable ADC and set prescaler to 1/128*16MHz=125,000
//and set interupt enable
//and start a conversion
ADCSR = 0b11001111;
}//dias measure
//*************************************************************
void diascal(void)
{
ADMUX=0b00100001;//choose ADC1 for reading DC
//enable ADC and set prescaler to 1/128*16MHz=125,000
//and set interupt enable
//and start a conversion
ADCSR = 0b11001111;
if(timecount>=200)
{
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("Dias_Cal");
timecount=0;
}
}
void initialize(void)
{
//Initialize LCD
timecount=0;
lcd_init(LCDwidth);
lcd_clear();
lcd_gotoxy(0,0);
lcd_putsf("White: Start");
lcd_gotoxy(0,1);
lcd_putsf("Grey: Stop");
//set up timer0
TIMSK =2; //turn on timer 0 comp match
OCR0 = 250; //set the compare register to 250
//prescaler to 64 and turn on clear-on-match
TCCR0 = 0b00001011;
timepress0 = 0;
timepress1 = 0;
DDRB=0x00; //PORT B is an input(2 buttons)
DDRD=0xff; //PORT D is an output(motor control);
PORTD=0x00;
PORTB=0xff;
PORTA=0x00;
maxpressure = 160;
meas_state = Sys_Measure;
former=TH_sys-0.01;
TH_sys=4.0;
TH_rate = 2.5;
TH_dias = 4.8;
timerun_dias=0;
time_pulse=0;
timerate=0;
timing=40;
timedisplay=0;
total_pulse_period=0;
systolic=0;
diastolic=0;
pulse_per_min=0;
Vref=5.0;
sys_count=0;
count_average=0;
countpulse=0;
DC_gain=213;
accum_data=0;
press_data=0;
count=0;
#asm
sei
#endasm
}
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