Loop inside Switch case

Projects Programming
1

This is an Abstract from my program

switch(buf[1]){
      case startRecord:
       display.clearDisplay();
       sensorValue = analogRead(sensorPin);
       display.setCursor(30,0); 
       display.setTextSize(1);
       display.print("LDR Reading:");
       display.setCursor(30,10); 
       display.setTextSize(2);
       display.print(sensorValue);
       delay(500);           
       display.display(); 
       break;
      case endRecord:
       display.clearDisplay();
       display.setCursor(20,10); 
       display.setTextSize(1);
       display.print("Waiting for Input");
       display.display(); 
       break;
       
      default:
        Serial.println("Record function undefined");
        break;
    }

In case 1, I would like to print the values of LDR after every half a second until the user inputs the second command which prompts the second case.

The display is done on OLED , hence the functions like display.display() etc are present in the program.

Can somebody tell me where should I place the loop in case 1 and where should I place the break statement?

Thanks in advance

2

Don't. Use the loop() functionality already present, and use your case values as state indicators. Look at the blink without delay.

3

Can somebody tell me where should I place the loop in case 1

Don't do that. Instead, each time through loop() when the code for the case executes test millis() to see whether half a second has elapsed and if so display the LDR new value.