Serial and interrupt

[test153]

Before posting posting to this forum I tried "DT_INTS-14" but I got some compailing errors, any idea how to fix them?

wsave3 position request 416 beyond RAM_END 95
wsave2 position request 288 beyond RAM_END 95
wsave1 position request 160 beyond RAM_END 95
Unable to fit variable RS2_Save

[mister_e]

open DT_INTS-14.bas file, there you'll find

' --- IF any of these three lines cause an error ?? ---------------------------- 
'       Comment them out to fix the problem ----
' -- It depends on which Chip you are using, as to which variables are needed --
wsave1      var byte    $A0     SYSTEM      ' location for W if in bank1
wsave2      var byte    $120    SYSTEM      ' location for W if in bank2
wsave3      var byte    $1A0    SYSTEM      ' location for W if in bank3

So, just modify it as requested

' --- IF any of these three lines cause an error ?? ---------------------------- 
'       Comment them out to fix the problem ----
' -- It depends on which Chip you are using, as to which variables are needed --
;wsave1      var byte    $A0     SYSTEM      ' location for W if in bank1
;wsave2      var byte    $120    SYSTEM      ' location for W if in bank2
;wsave3      var byte    $1A0    SYSTEM      ' location for W if in bank3

[test153]

So I did and now there's only one error left...

Unable to fit variable RS2_Save

[mister_e]

well, seems we hit one of the limitation of the low-end PIC. In this case, asm INT and home made serial routine would work. 12F683 would provide better range.


Let's see what Darrel would suggest...

[test153]

I suppose that the only way to write the serial routine is to code it in asm.

Damn me for choosing this somewhat limited pic

[Archangel]

12f683 is 8 pin device and has twice the flash memory available.

[test153]

12f683 is 8 pin device and has twice the flash memory available.

Thanks for the tip, but I have already bought the other one - as I said to late to change my mind. Anyway i've been doing some diggin and I'm going forward with the ASM serial routine part. There's only one little problem - the code I'm using gives me a "Symbol previously not defined" error. How do I setup variables so I can write to them inside the asm code and reuse them in picbasic?