Returning to while loop after the interrupt has been called

Mbed OS Best practice
1

I am creating a programme to control temperature through the use of a stepper motor. I have the system running fine until the very end. I then want it to return to the start of the while loop after i have called the interrupt to check the temperature. The issue is that when i operate the motor i can no longer check the temperature. Any advise would be appreciated!

#include “mbed.h”
#include “TextLCD.h”

// Declarations

BusOut Steppermotor(p11, p12, p13, p14); // (IN1) - (IN2) - (IN3) - (IN4)
AnalogIn LM35(p15); // Temperature Sensor
DigitalOut GreenLED(p7);
DigitalOut RedLED(p5);
DigitalOut Orange_LED_flash(p6);
InterruptIn Button(p25); // Temperature check
InterruptIn Button2(p24); // Motor Control - Window open
InterruptIn Button3(p23); // Motor control - Window close
Timeout Response;

TextLCD lcd(p21, p22, p27, p28, p29, p30, TextLCD::LCD16x2); // LCD Display Wiring

// variable declartations

float tempC=0; // Temperature in celcius
float target_temp = 20; // Target temperature
int step = 0; // variable integer values for the system.
int dir=1;
int i=0;

void return_to_start(){
if(tempC<=target_temp)
{
GreenLED = 1;
wait(3);
}

    else if(tempC>target_temp){
        GreenLED = 0;
        Orange_LED_flash = !Orange_LED_flash;
        wait(0.5);
        lcd.cls();
        wait(0.5);
        lcd.printf("Window requires\n adjustment\n");
        lcd.cls();
        }
        }

void Temp_check() { // Temperature check interrupt
tempC=LM35.read();
tempC=(tempC3.3100); //LM35 Thermistor

    // Display temperature
    
    lcd.locate(0,0);
    lcd.printf("cT      sT");
    lcd.locate(0,1);
    
    // Display current and target temperature
     
    lcd.printf("%.1f    %.1f",tempC,target_temp);
    wait(5);
    lcd.cls();
    }

void Motor_control(){

    i=56;                           // The amount of times the loop will run, in this case, 56.
while(1){                           
                                    
    if(i>56) {GreenLED=0; RedLED=0;} 
                                    
    if(Button3==1)  {i=0;dir=0;}   // These are the variable inputs that will
    if(Button2==1)  {i=0;dir=1;}   // determine the movement of the motor
    
    while (i<=56)   {
        switch(step)
        {
            case 0: Steppermotor = 0x1; break; //0001 
            case 1: Steppermotor = 0x2; break; //0010
            case 2: Steppermotor = 0x4; break; //0100
            case 3: Steppermotor = 0x8; break; //1000
            
            
            default: Steppermotor = 0x0; break; //0000
        }
            
        if(dir==1) {step++;} else {step--;}
        if(step>3) {step=0;}
        if(step<0) {step=3;}
            
        if(dir==1) {GreenLED=1; RedLED=0;} else {GreenLED=0; RedLED=1;}
            
        wait(0.005);    //speedooo
        i++;
    
    }
}

}

int main(){

Button.rise(&Temp_check); // Interrups
Button2.rise(&Motor_control);
Button3.rise(&Motor_control);

// welcome message

lcd.cls(); 
wait(2);

GreenLED = 1;
wait(0.5);
GreenLED = 0;
wait(0.5);
GreenLED = 1;
wait(0.5);
GreenLED = 0;
wait(0.5);
GreenLED = 1;
wait(0.5);
GreenLED = 0;
wait(3);

lcd.printf("AD Automated\nControl Systems\n");
wait(3);
lcd.cls();
wait(3);
lcd.printf("Temp. ready for\n assesment \n");
wait(3);
lcd.cls();

while(1){
    
    if(tempC<=target_temp)
    {
         GreenLED = 1;
         wait(3);
        }
        
    else if(tempC>target_temp){
        GreenLED = 0;
        Orange_LED_flash = !Orange_LED_flash;
        wait(0.5);
        lcd.cls();
        wait(0.5);
        lcd.printf("Window requires\n adjustment\n");
        lcd.cls();
        }
        Response.attach(&return_to_start,2.0);{
            }
            }
            }
2

Hello,

please be so kind and use these 3 ``` symbols before and after your code for correct code formatting for better view.

Of course because you have infinite loop inside your handler for rise event - Motor_control(), so your program is imprisoned in ISR forever.

BR, Jan

3

JohnnyK, thank you very much. This has solved the issue. I’m in my first year of college so i’m new to this.

Much appreciated .