Multiple External Interupts

[w7ami]

Thanks Skimask,

I think I'm good now. I just needed to enable INTCON1 and INTCON2. Somehow I missed them. I have some test code up and working now.

What I doing is not super time critical so I am doing everything I can to stay away from assembly. The only assembly I can do is with a soldering iron, screw driver, wrench....

Thanks also for the hints on TMR0 I'll be needing that soon.

Terry

[skimask]

Thanks Skimask,
I think I'm good now. I just needed to enable INTCON1 and INTCON2. Somehow I missed them. I have some test code up and working now.
What I doing is not super time critical so I am doing everything I can to stay away from assembly. The only assembly I can do is with a soldering iron, screw driver, wrench....
Thanks also for the hints on TMR0 I'll be needing that soon.
Terry

In the case of TMR0...registers to note:

INTCON.7 = 1 'enable ALL interrupts
INTCON.6 = 1 'enable ALL peripheral interrupts
INTCON.5 = 1 'enable TMR0 OVERFLOW interrupt
INTCON.2 = 1 'TMR0 OVERFLOWed, so it interrupted, must be cleared manually after your program has recognized the interrupt (INTCON.2 = 0)
INTCON2.2 = 1 'sets TMR0 to high priority, not really needed, but useful to note
T0CON...all bits for controlling TMR0 (see the datasheet)

[w7ami]

Just in case someone wants to see how to do multiple hardware interupts, here is my quick and dirty program.

;************************************************* *******
; PIC18F4620
DEFINE OSC 40
; Setup Ports
TRISB = %11111111 ; Port B all inputs
TRISD = %00000000 ; Port D all outputs
DTR var INTCON.0 ; alias to intcon
DSR var INTCON2.0 ; alias to intcon1
ACC var INTCON3.0 ; alias to intcon2
INTCON = %10010000 ; Enable External Interupt INT0

INTCON2 = %10110000 ; INTCON2.7 = All pull up are disabled
; INTCON2.6 = INT0 trigger on falling edge
; INTCON2.5 = INT1 trigger on rising edge
; INTCON2.4 = INT2 trigger on rising edge
; INTCON2.3 = Not used
; INTCON2.2 = TMR0 low priority
; INTCON2.1 = Not used
; INTCON2.0 = Port change priority
INTCON3 = %01011000 ; INTCON3.7 = INT2 Low priority
; INTCON3.6 = INT1 Hi priority
; INTCON3.5 = Not used
; INTCON3.4 = INT2 external enabled
; INTCON3.3 = INT1 external enabled
; INTCON3.2 = Not used
; INTCON3.1 = INT2 Flag (Read Only)
; INTCON3.0 = INT1 Flag (Read Only)

On Interrupt Goto INTERUPTS ; Define interrupt handler
;************************************************* ********
Loop:
PORTD.0 = 0 ; Turn all LEDs on
PORTD.1 = 0
PORTD.2 = 0
PORTD.3 = 0
Goto loop ; Do it forever
;************************************************* ********
; Interrupt handler
Disable ; No interrupts past this point
INTERUPTS:
if INTCON.1 = 1 then
PORTD.0 = 1 ; Turn LED1 OFF
Pause 500 ; Wait .5 seconds
INTCON.1 = 0 ; Clear interrupt flag
endif
if INTCON3.0 = 1 then
PORTD.1 = 1 ; Turn LED2 OFF
Pause 500 ; Wait .5 seconds
INTCON3.0 = 0 ; Clear interrupt flag
endif
if INTCON3.1 = 1 then
PORTD.2 = 1 ; Turn LED2 OFF
Pause 500 ; Wait .5 seconds
INTCON3.1 = 0 ; Clear the interupt flag
Endif
RESUME ; Return to main program
ENABLE
;************************************************* ********
END

Terry