Customizing the DT_INTS-XX.bas Instant Interrupt

[boroko]

Dave,
Thanks for sharing that. It behaves differently than the one i did, so I'll have to compare and learn what I missed. Still hasn't corrected my INT on Change (IOC_INT) issue, so I still have something wrong. It's always something....

bo

[Dave]

Bo, I have NO issue using it with IOC or INT. I would make sure ALL registers are set for using IOC. I have attached the page that tells of all the resisters affected.

[boroko]

Dave,
Thank you for the help. I have been trying to look through the registers, but obviously missing something.

Here is the stripped down core of the program. I was under the impression that DT_INTS took care of some of these registers, but manually included them in case I'm missing something.

The TMR code is working fine, I just can't the IOC to work.

'****************************************************************
'                       16F18624,25,26
'                ---------------u-----------------
'      5v pwr  -1|VDD++                    -- VSS |14-    Gnd     
'              -2|RA5                 RA0/ICSPDAT |13-        
'  Gge/Tac Drv -3|RA4                         RA1 |12-        
'              -4|RA3/MCLR/vpp                RA2 |11-    Neutral > ECM          
'    Tach IN   -5|RC5                         RC0 |10-    Neut LED        
'              -6|RC4                         RC1 |9-     VSS Led     
'        VSS   -7|RC3                         RC2 |8-              
'                ----------------------------------    

'******************************************************************
#CONFIG
   __config _CONFIG2, _MCLRE_OFF & _CP_OFF
#ENDCONFIG
INCLUDE "DT_INTS-16.bas"  ; v1.10 Modified for 16F18326 IOC_INT
INCLUDE "ReEnterPBP.pbp"    ; Include for DT_INTS.  ver 3.4

' alias pins:
Nout        var PORTA.2  ' Neutral switch output signal  
TachDrv     var PORTA.4  ' Tach Drive 
N_LED       VAR PORTC.0  ' LED for Neutral
VSS_LED     VAR PORTC.1  ' LED for VSS
VSS         var PORTC.3  ' Vehicle Speed Sensor output signal ON 
TachIN      var PORTC.5  ' Monitor ECM tachometer signal 

PIE0 =  %00010000        ' Enable interrupts (maybe not needed)
INTCON = %1100001        ' Global and peripheral INTS enabled, Rising edge
IOCCP = %00100000        ' Interrupt on change on RC5, tach input
T0CON0 = %10010000       ' TMR0 Postscale=0, 16 bit
T0CON1 = %01000000       ' Fosc/4, No Prescale
T1CON = %00000001        ' TMR1 prescale=2, clock=Fosc/4, TMR1=on 
T1GCON = 0
PORTA = %00001000        ' Outputs except 3 for SpeedAdj 
PORTC = %00100000        ' Outputs except 5 for Tach In input 
TRISA = %00001000        ' Pins output(except 3 for Speed adj)
TRISC = %00100000        ' Outputs except 5 for Tach In input
ANSELA = 0
ANSELC = 0
;----[High Priority Interrupts]----------------------------------------
ASM
INT_LIST  macro    ; IntSource,   Label,   Type, ResetFlag?
        INT_Handler   IOC_INT,   _Capture,  PBP,  yes
        INT_Handler   TMR0_INT,  _Timer0,   PBP,  yes
        INT_Handler   TMR1_INT,  _Timer1,   PBP, yes
    endm
    INT_CREATE               ; Creates the High Priority interrupt processor
ENDASM
@    INT_ENABLE  IOC_INT     ; enable Capture interrupts
@    INT_ENABLE  TMR0_INT    ; enable Timer 0 interrupts
@    INT_ENABLE  TMR1_INT    ; enable Timer 1 interrupts
;-----------------------------------------------------------------------
Main: 
GOTO Main
'---[IOC - interrupt handler]------------------------------------------
Capture:  ' Enter here with Tach Pulse from ECM (IOC)
    toggle VSS_led 
    toggle N_LED
    pulsout tachdrv, 50         ' normal 4 cy tach, 500uS  
@ INT_RETURN 
'---[TMR0 - interrupt handler]--  --------------------------------------
Timer0:                         ' Set Idle flag if timer expires,
   toggle Nout
@ INT_RETURN
'---[TMR1 - interrupt handler]----------------------------------------
Timer1:
    toggle VSS
@ INT_RETURN

END

[mpgmike]

Are you resetting the PIR0.IOCIF or IOCCF.5? This would be in the DT_INTs. It's possible you're trying to clear the wrong flag. PIR0.IOCIF is read only and is Hardware cleared when IOCCF.5 = 0.

[Dave]

I din't see where you are clearing the individual IOCCF flag bits before or after the interrupt?

[boroko]

Dave,
It was my belief that the "yes" in

INT_Handler   IOC_INT,   _Capture,  PBP,  yes

did that.
I haven't dissected DT_INTS enough to verify that, and it may be an artifact of not originally being part of Darrel's program.
I can look at that. Seems reasonable with the results I'm seeing.

bo

[boroko]

Well, looking at the DT_INTS-16 that Dave was so nice to share, I couldn't see the issue, so I just added a line to clear the flag and it seems to be reacting much better. If I get the time, I may look deeper into DT_INTS and see if I can understand how it works better than the 20% I can make sense of. Until then, this seems to solve my problem.

'---[IOC - interrupt handler]------------------------------------------
Capture:  ' Enter here with Tach Pulse from ECM (IOC)
    toggle VSS_led 
    toggle N_LED
    pulsout tachdrv, 50         ' normal 4 cy tach, 500uS 
    IOCCF = 0 
@ INT_RETURN

Now to incorporate it back into the real program and see if I have the issue solved...

Thank you guys for all the help. Would not likely have seen that with out it.

bo