W Register

[JimKueneman]

Is there a way to view the contents of the W register while debugging?

Jim

[yo2lio]

only at P18 or higher ... WREG

[JimKueneman]

Bummer, I hope this is on the wish list for the lower series of PICs.

Jim

[yo2lio]

Bummer, I hope this is on the wish list for the lower series of PICs.

Jim

You should tell this to Microchip because at lower series WREG is not mapped into REGISTERS.

[Stefan Uhlemayr]

Is there a way to view the contents of the W register while debugging?

Hm, I still don't know how to realize this in mikroPascal (I've only done some tests up so far...), but in assembler you have a "workaround" for the baseline and midrange-PIC's:
- define an additional variable (named for example DEBUG_REG), which is placed on a register-address, which is shared over all banks (adr. 070H in the PIC16F628A for example) (have a look to the data-memory-map in the datasheet of the PIC you are using)
- then place a MOVWF DEBUG_REG whereever you are interrested in the content of the W-register (this instruction doesn't change any status-bits, so it will not influence your code in a way, only it works as a small delay (1 instruction-cycle))

Hope this helps (and maybe a mikroPascal-specialist can "translate" it for you),
Stefan

[janni]

Yes, that's possible using internal variables compiler defines for itself exactly at these common addresses (the variables are called STACK_x and are used for all 'behind the scenes' operations). Compiler rarely uses all of these variables, so one may use one of the last ones (like STACK_15) for own purposes, like shadowing W register:

Code: Select all

asm movwf STACK_15 end;

Note, that asm block may disturb Pascal code optimisation, so the final code may change after inserting the above.

Bummer, I hope this is on the wish list for the lower series of PICs.

It was suggested for simulation, but to no avail.