Why is my PIC18F452 reseting?

[Vincent]

Hi this is my second posted Thread on this Forum.

The problem is i belive my PIC 18F452 is reseting it's self every 20 to 30 interrupts it recives via RS232. Is this possible?
Or is the reset a result off overflowing Stack?

The µController has to carry out several HSEROUT and A/D operations after receiving an interrupt .
I do not know if this data is stored on the PIC after ist send or read?

Many thanks

by NVM

[mister_e]

everything is possible, your code will help us to point you on the most possible problem.

[Vincent]

Thanks again mister_e!

I would like to post the hole program CODE but it is to long!
Im not sure whitch parts of the program are necessary?
is there a posibility to send it to you?

The program is the same like the one in my other posted thread
"Controlling an 240x128 LCD touch panel"

thanks

by NVM

[mister_e]

Hi NVM, Where i am right it's almost impossible to get in touch with all the hardware you have. I have 2-3 pending project for some user here (no no no not free ) and i have some daily 'asian medecine' session to take. Couldn't be impossible to check your whole code... but if it's a rushing project and it can be publish here, you can even use the file attachement and post the whole thing here.

I sent you my e-mail in your PM.

[Bruce]

This does sound like stack overflow reset. You can turn this option off in config word for a quick test, but to fix it, make sure whenever you use a CALL or GOSUB, that you RETURN instead of GOTO to get back.

[sougata]

Hi,

Have a look at the code below and modify according to your needs to test a stack over/underflow

INIT:
'BELOW IS A CHECK FOR STACK ResetERROR FOR DEBUG ************************************
IF STKPTR.7 = 1 THEN        ' CHECK FOR STACK POINTER OVERFLOW
HSEROUT ["STACK OVERFLOW"]  ' DUMP DATA TO LCD
STKPTR.7 = 0                ' CLEAR STACK POINTER OVERFLOW BIT
GOSUB DLY5K                 ' CALL THE 5 SECONDS DELAY SUBROUTINE
ENDIF

IF STKPTR.6 = 1 THEN        ' CHECK FOR STACK POINTER UNDERFLOW
HSEROUT ["STACK UNDERFLOW"] ' DUMP DATA TO LCD
STKPTR.6 = 0                ' CLEAR STACK POINTER UNDERFLOW BIT
GOSUB DLY5K                 ' CALL THE 5 SECONDS DELAY SUBROUTINE
ENDIF