LCD freezing problem with interrupts

[Jerson]

But sometimes when I navigate into this menu (when the AC motor is either on or off), and very randomly, the LCD is "freezing" and after 2 seconds the display is reseted. The 3-phase PWM outputs are not affected at all.

Now, if I remove only the interrupts (TMR1_INT, INT0, INT2) of my program, this problem doesn't occur.

Do you get the fault indication? I suspect, you are getting into the FltSub when you say the LCD is frozen.

You can possibly disable the ocint and the stopint for checking this possibility. Does the LCD still freeze?

[sayzer]

OSC is defined as 40Mhz, where is the config settings?
which pic is this?

[HenrikOlsson]

Completely unrelated to your problem, or perhaps not but anyway.....
Does these constructs really work? Do they even compile:

' FWD/RWD button
IF PORTC.1=%1 THEN
   IF rot=%0 AND run=%0 AND flag4=%0 THEN rot=%1:flag2=%0:flag4=%1
   IF rot=%1 AND run=%0 AND flag4=%0 THEN rot=%0:flag2=%0:flag4=%1
ENDIF

I think you need an ENDIF for each of those IF statements.

[pxidr84]

Completely unrelated to your problem, or perhaps not but anyway.....
Does these constructs really work? Do they even compile:

' FWD/RWD button
IF PORTC.1=%1 THEN
   IF rot=%0 AND run=%0 AND flag4=%0 THEN rot=%1:flag2=%0:flag4=%1
   IF rot=%1 AND run=%0 AND flag4=%0 THEN rot=%0:flag2=%0:flag4=%1
ENDIF

I think you need an ENDIF for each of those IF statements.

I've no problems with that (but I've modified this part to something like that):

if rot=%0 then
if run=%0 then
if flag4=%0 then
rot=%1
flag2=%0
flag4=%1
endif
endif
endif

Yeah, not very readable but take less program space than AND operator. And it works good.

[pxidr84]

OSC is defined as 40Mhz, where is the config settings?
which pic is this?

A special PIC for motor control, it's the PIC18F4431, 10MHz quartz with PLL enabled (so 4*10=40MHz).

[sayzer]

So, while LCDOUT command is being executed, an interrupt is occuring.

To "test" this, you can disable all interrupts before lcdout command and enable them right after.
This is just to see.
But this will definitely effect your motor. It can give you a point anyway.

[pxidr84]

Do you get the fault indication? I suspect, you are getting into the FltSub when you say the LCD is frozen.

You can possibly disable the ocint and the stopint for checking this possibility. Does the LCD still freeze?

Actually I'm not at home so I will try to remove ocint and stopint next friday.

And no, I'm not getting into Fltsub when my LCD is frozen: in reality, the menu is reseted to the very first position (1: ISENS).