jumping out of subroutine with goto

Hey @ all,
I wonder what happens within the µC when I write code that jumps out of a subroutine with the goto command?

Example:

Code:

---

main:
  GOSUB label
goto main

label:
  GOTO somwhereelse
RETURN

somwhereelse:
  DOSOMETHING HERE
GOTO main

---

I know from other BASIC dialects that one should'nt do this, because it messes up the pointers. But what happens in PBP eg. the PIC itself?

Is there a better solution for this problem?

Greetings, helloo

I recently had a project I was working on that would work fine for a while, then reboot and work fine for a while, then completely lock up. After a power cycle this would repeat. The project had buttons, and I was polling the buttons in a subroutine, if a button press was detected I jumped somewhere else using a goto. I soon realized there was a pattern and it was a certain number of button presses, I forget exactly how many. I moved my button polling routine to the main loop instead of a subroutine and it fixed the problem. I assume a stack was overflowing causing the problems because of using a goto inside of a subroutine.

Quote:

---

Originally Posted by helloo

Hey @ all,
I wonder what happens within the µC when I write code that jumps out of a subroutine with the goto command?

Example:

Code:

---

main:
  GOSUB label
goto main

label:
  GOTO somwhereelse
RETURN

somwhereelse:
  DOSOMETHING HERE
GOTO main

---

I know from other BASIC dialects that one should'nt do this, because it messes up the pointers. But what happens in PBP eg. the PIC itself?

Is there a better solution for this problem?

Greetings, helloo

---

Try:

Code:

---

main:   
  GOSUB label
  IF bit1 = 1 then
    GOTO somwhereelse
  Endif
  goto main 

label:   
    'GOTO somwhereelse
    F x > 3 then
        bit1 = 1 'set a flag
    Endif
    RETURN
    ... 
 RETURN

 somwhereelse:
    DOSOMETHING HERE
 GOTO main

---

Norm

Quote:

---

Originally Posted by helloo

Hey @ all,
I wonder what happens within the µC when I write code that jumps out of a subroutine with the goto command?

Example:

Code:

---

main:
  GOSUB label
goto main

label:
  GOTO somwhereelse
RETURN

somwhereelse:
  DOSOMETHING HERE
GOTO main

---

I know from other BASIC dialects that one should'nt do this, because it messes up the pointers. But what happens in PBP eg. the PIC itself?

Is there a better solution for this problem?

Greetings, helloo

---

Or, you can try this,

Code:

---

main:
  GOSUB label
goto main

label:
  GOSUB somwhereelse
RETURN

somwhereelse:
  DOSOMETHING HERE
RETURN


---

Use GOSUB and RETURN instead of GOTO.

Robert

Thanks for all. That is a solution to the problem. Thank you.