PM Asembler and Melab U2 Programmer Problems with PIC16F1939

[bogdan]

I have the pic16F1939 on mine (ver 4.32)

[mister_e]

There is NO good reason to use PM as far as I know. Just stick to MPASM. You have much more great "hidden" features in...

[bogdan]

welcome back !

[rsocor01]

Bogdan,

Tonight I will check to see what software version I have. I bought my U2 programmer about two years ago, so it is probably an old version. I need to research this issue a little bit more.

Mister_e,

It is very nice to see you back . I have a program >8000 words that I developed using PM. This program uses interrupts on a PIC16F727 to read values for a built-in capacitance touch sensor. However, if I use MPASM the sensors don't work properly. I suspect it has to do with different interrupt intervals if I use MPASM, but I haven't tested this yet. This is the reason why I use PM for my touch sensor projects.

Robert

[mister_e]

Or it's working as design with MPASM, but have problem with PM, but... ya never know.

Do yourself a big favor, isolate the problem, keep the ISR and a simple short and sweet main loop, see if the problem's still there.

Usual Convention: Keep the ISR as short as possible.


Get rid of PBP interrupt and use ASM one, or DT.

Maybe not a bad idea to make sure you're using the latest MPASM version.

[rsocor01]

Bogdan,

I have an old software version 4.23. In Melabs.com they have a free download for the latest Beta v4.32 software. I will install it and will post back with results.

Mister_e,

Yes, I know that I have to fix that problem with the interrupts to make the sensors work properly with MPASM. Now, I am using ON INTERRUPT GOTO ISR to handle the ISR. There are many lines of code that need to get done in the ISR routine. So, if I have many lines of PBP in the ISR routine, what method should I use?

Should I go with something like this?

@myint                  ; create myint label
.......
   @ retfie  FAST       ; Return with 'auto restore' of WREG, STATUS and BSR

Or, should I do something like this with DTs interrupts?

INCLUDE "DT_INTS-14.bas"     ' Base Interrupt System
INCLUDE "ReEnterPBP.bas"     ' Include if using PBP interrupts

ASM
INT_LIST  macro    ; IntSource,        Label,       Type, ResetFlag?
			INT_Handler   TMR0_INT,  _MyInterrupt,   PBP,  yes
	endm
	INT_CREATE               ; Creates the interrupt processor
ENDASM

@ INT_ENABLE  TMR0_INT      ; enable Timer 0 interrupts

.....

MyInterrupt:                       
.....
@ INT_RETURN

[mister_e]

If you have PBP lines in your ISR, I'd say go for your second example.

What kind of interrrupt it is? Remember that ON INTERRUPT will jump in your ISR ONLY after finishing a x current job. So if you have, say PAUSE 5000, in your main loop, it may take up to 5 secondes to jump in the ISR (assuming your main loop is actually doing the PAUSE). Maybe why your sensor doesn't work that good. Now why better on PM than MPASM, I don't know.