Instant Interrupts - Revisited

[tiger_bel]

read the thread many times,

pic 18F4525
interupt on port B.0 works great with DT add-on using int0_int
but on falling edge of incoming pulse
the full program runs without any problem


i want to change it on rising edge using rbc_int
but - pic blocks - nothing works anymore ???
even de ledflash sub .....
what am i doing wrong - i don't see it.


code



'****************************
' as test for RBC_int
INTCON.0 = 0 ' RBIF
INTCON.3 = 1 ' RBIE
' INTCON2.0 = 1 ' RBIP
'****************************
' ok for int0_int on port B but falling edge ( unusable in this case)

INTCON2.6 = 1 ' rising edge ????
INTCON.1 = 0
INTCON.4 = 1 ' enable int0 interrupt RB0
'****************************
' include special interupts
INCLUDE "DT_INTS-18.bas" ; Base Interrupt System
INCLUDE "ReEnterPBP-18.bas" ; Include if using PBP interrupts
INCLUDE "Elapsed_INT-18.bas" ; Elapsed Timer Routines

ASM
INT_LIST macro ; IntSource, Label, Type, ResetFlag?
; INT_Handler INT0_INT, _triggertest, PBP, yes
INT_Handler RBC_INT, _triggertest, PBP, yes
INT_Handler TMR1_INT, _ClockCount, PBP, yes
endm
INT_CREATE ; Creates the interrupt processor
ENDASM
gosub initial ; all var to 0
gosub ledflash ; flash leds 10 times
T0CON = %10010010 ; T0 = 16-bit, Prescaler 8
;@ INT_ENABLE INT0_INT ; enable external (INT) interrupts
@ INT_ENABLE RBC_INT ; enable RB (INT) interrupts on change
@ INT_ENABLE TMR1_INT ; Enable Timer 1 Interrupts

GOSUB ResetTime ; Reset Time to 0d-00:00:00.00
GOSUB StartTimer ; Start the Elapsed Timer


'*******************************************
Main:
if trig_in =1 then
................
endif

trig_in = 0
goto main
'******************************************
';---[INT - interrupt handler]--------------------------
triggertest:
trig_in = 1 ' set flag interupt
@ INT_RETURN
end

[Darrel Taylor]

tiger_bel,

RBC_INT's generate an interrupt on BOTH edges of RB4 thru RB7. You can't set it to just Rising or Falling.

Then once it interrupts, you have to read PORTB to "End the Mismatch".
A simple Dummy = PORTB in the handler will do it.

You also need to compare that read, with the value of PORTB the last time it interrupted to figure out which pin changed, and which state it changed to.
<br>

[tiger_bel]

many thanks for the info,

i just figured out that using a simple sub to scan the port works fine...
and i use port B.0 not 4...7

rgds
tb

[sougata]

Hi,

many thanks for the info,

i use port B.0 not 4...7

Then why on earth you are enabling it

@ INT_ENABLE RBC_INT ; enable RB (INT) interrupts on change