DT_INTS-18xv for 18F K42, K83, and Q43 families

[tumbleweed]

I revamped DT-INTS for the 18xv series of devices (18FxxK42, 18FxxK83, and 18FxxQ43) to take advantage of the hardware context feature of these new devices, along with a few other enhancements.
These routines should be faster, smaller, and use less RAM than the standard DT-INTS.

The file names have changed, but other than that the usage is the same as other DT-INTS implementations...

' ---------- Set up DT_INTS-18 Routine for Instant Interrupt handling -----------
DEFINE USE_LOWPRIORITY 1 ' define if using Low Priority interrupts
INCLUDE "DT_INTS-18xv.bas" ' Base Interrupt System for 18Fxv processors
INCLUDE "ReEnterPBP-18xv.bas" ' Include if using PBP interrupts
INCLUDE "ReEnterPBP-18xvLP.bas" ' Include if using Low Priority PBP INTS
'------------------------------------------------------------------------------

The default CONFIG setting for these devices enables multi-vector mode, so be sure to disable it by adding

#config
 CONFIG MVECEN = OFF ; Interrupt contoller does not use vector table (legacy mode)
 #endconfig

to your main program

EDIT: new version V4.30 available that fixes an issue with INT0 and K42/K83. See Post 5 below.

[Ioannis]

Many thanks for the new files.


Ioannis

[Henrik Olsson]

Thank you tumblweed for this!
I'm using an 18F46K42 and I'm trying to get INT0 interrupt to work with the DT_Ints files from post 1 but I'm struggling,

TMR1 Interrupt works so I have the basics down and if I do (without any interrupt code included):

TRISC.5 = 0
ANSELB = 0
ANSELC = 0​

Main:
  HSEROUT["Tick..", 13]
  PAUSE 500
  HSEROUT["Tock..",13]
  PAUSE 500

  If PIR1.0 THEN    ' <--- INT0 interrupt flag
    LATC.5 = !LATC.5
    PIR1.0 = 0
  ENDIF
Goto Main​

The LED attached to RC5 changes state when the INT0 pin (RB0) is tickled telling me the flag is being set. However, when I try to use the interrupt it does not work:

INCLUDE "DT_INTS-18xv.bas"
INCLUDE "ReEnterPBP-18xv.bas"

ASM
INT_LIST macro ; IntSource, Label, Type, ResetFlag?
           INT_Handler INT0_INT, _Tick, PBP, yes
     endm
     INT_CREATE ; Creates the interrupt processor
ENDASM

TRISC.5 = 0
ANSELB = 0
ANSELC = 0


@ INT_ENABLE INT0_INT

HSEROUT["Program Start", 13]

Main:
  HSEROUT["Tick..", 13]
  PAUSE 500
  HSEROUT["Tock..",13]
  PAUSE 500
Goto Main

Tick:
  LATC.5 = !LATC.5
@ INT_RETURN​

In post 1 tumbleweed mentions MVECEN but looking at the defauly config for the 46K42 that one is already off and since I can get TMR1 interrupt to work I don't think that's got anything to do with it.

Any ideas? In the meantime I'll dig into the assembler include files to try and see if either the IE or IF bits for INT0 points to the wrong location.

Thanks!
/Henrik.

[Henrik Olsson]

I think I found it... In the DT_Ints-18xv.bas, line 1014-1016:

ifdef INT0IF ;----{ INT0 External Interrupt }----------[PIR1, INT0IF]---
    INT_Source PIR1,INT0IF, PIE0,INT0IE, IPR1, INT0IP
endif​

PIE0 should be PIE1.

Same issue for the K83 at line 1361 but not for the Q43 (line 532).

/Henrik.

[tumbleweed]

Thanks for catching that!

I've corrected it and updated the files to v4.30