Still HSEROUT woes

[mister_e]

just an idea... how about replacing the Hserout by a TXREG=Char loop. Just by seeing the output of it, it seems the routine just redo the Hserout line without keeping track of what have been already sent...

OR it have to exist a character pointer variable in the HSEROUT macro somewhere... if so, you probably didn't save it in the INT Handler... mmm interesting....

[mister_e]

pfff... maybe

    IF TimerFlag = 1 THEN
       SecondsCounter = SecondsCounter + 1
       INTCON = 0
       HSEROUT ["Seconds = ",#SecondsCounter,13,10]
       INTCON = %11100000 
       TimerFlag = 0
       Timer = 0
       ENDIF

    IF KeyHitFlag = 1 THEN
       INTCON = 0
       HSERIN [Y]
       HSEROUT[Y]
       INTCON = %11100000 
       KeyHitFlag = 0
       ENDIF

[mister_e]

ah come on brain cell (no s)... wake up...

IF INTCON.2 = 1 THEN
TMR0H = $EC ; Reload TMR0 to 65535 - 5000
TMR0L = $77
Timer = Timer + 1
IF Timer >= 1000 THEN
TimerFlag = 1
ENDIF

ENDIF

IF PIR1.5 = 1 THEN
KeyHitFlag = 1
ENDIF
INTCON.2 = 0 ; Clear the timer flag

where the PIR1.5 is cleared?

[Charles Linquis]

In the PBP program. HSERIN clears the flag.

[mister_e]

yeah right but how about if you move the main HSERIN to the interrupt routine?

[SteveB]

What happens if you remove the line?:

DEFINE NO_CLRWDT 1

When I plugged you code into MPLAB and ran the sim, it gave me a watchdog timeout.

Steve

[mister_e]

but if the watchdog timer is not set in the config fuse, it won't change anything... at least i guess.

[Charles Linquis]

mister_e,

You insight is very helpful! Interrupts were, indeed killing the HSEROUT routine. Setting INTCON to "0" just before the HSEROUT allows the characters to be output properly.

Grabbing the character with HSERIN inside the ISR works as well!

This helps a lot, but I don't believe that I can disable ints during serial transmission. MAYBE I can work around this.

It would be nice to know if I have a bug in my ISR, or if PBP itself has a bug that prevents HSEROUT from being an interruptable routine.

By the way. Everyone else seems to have found a nice way to include formatted code without putting it "in line". Could you please tell me how to do that?

[mister_e]

Great!!!

look the following link for VB code
http://www.picbasic.co.uk/forum/misc.php?do=bbcode

[Charles Linquis]

Just to answer the random notes around the thread and also to summarize:

The watchdog timer was disabled during programming.
The interrupt worked exactly as expected (that is, it DID provide a 'tick' every
millisecond).

Writing the interrupt in pure assembly, saving Wreg,STATUS, FSR0L, and FSR0H
produced EXACTLY the same result as using a modified "Tim Box" routine which saves the same registers as above PLUS all the PBP registers.

Does this prove that HSEROUT cannot be interrupted? I have a question in to MELabs.