Interrupt 101

[Hylan]

Okay, I've been looking at Daryl Taylors interrupt programs as recommended by Steve. I downloaded everything and tested the blinky blinky to make sure it worked. I changed the toggle pin to one on my board with an LED and it worked.

Now I'm trying to figure out how to incorporate this into my program and what terms I can change and what I can't and where it needs to be placed in the program. I don't have anything called a "main" loop for example.

So for example with this sample code:

 
LED1   VAR  PORTB.1
 
INCLUDE "DT_INTS-18.bas"     ; Base Interrupt System
INCLUDE "ReEnterPBP-18.bas"     ; Include if using PBP interrupts
 
ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler    INT_INT,  _ToggleLED1,   PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor
ENDASM
 
@   INT_ENABLE   INT_INT     ; enable external (INT) interrupts
 
Main:
  PAUSE 1
GOTO Main
 
'---[INT - interrupt handler]---------------------------------------------------
ToggleLED1:
     TOGGLE LED1
@ INT_RETURN

I understand that the "include" statements go at the top when declaring stuff but I'm not sure where to put the "ASM" section
and the "INT" Interrupt handler commands

I tried a couple things and the blinky blinky always worked but I never got my part of the program to run so it seemed to only stay in the above portion.

Getting closer, I can smell it, but I can't quite see it or taste it.
Thank you,
Hylan

[mackrackit]

In the example you have posted place your code in the "Main" loop. To start try a PAUSE type blink in the Main loop to seehow ot works.

[Hylan]

Beautiful! I've got the interrupt working properly on the one pin. Now I can start playing with all the other layers and types. I'm sure I will have more questions but at least I've got a starting point.
Thank you!
Hylan

[Hylan]

I'm finally back looking at this again and would like to use the RX2 pin as the interrupt trigger when a serial string comes in on my 18F6520 chip.
I'm currently using a hserin command and just running it in my main loop to pick up new signals and 999/1000 it works fine.
I'm looking through pic manual but it's pretty Greek to me.
Does anyone have an example of how to configure this for the RX2 pin?
Thank you,
Hylan

[Hylan]

I did a search and think I found some examples, sorry for the premature post.

[Charles Linquis]

Here is a snippet of running code

 

INTCON = %11000000

'---------------------------------------------

    INCLUDE "DT_INTS-18.bas"         
    INCLUDE "ReEnterPBP-18.bas"    
  
ASM
INT_LIST  macro     

            INT_Handler    RX2_INT,    _GetCharPort2,    PBP,  yes

        endm
    INT_CREATE      
ENDASM
;----------------------------------------------------------------------------------                         
Goto OverInt


GetCharPort2:
    
    for I_XDataLen = 0 to 63
        HSERIN2 50,TimeOut2,[I_XDataChar]
        if I_XDataChar = 13 then goto GetChar2Valid
        I_XDataBuf[I_XDataLen] = I_XDataChar
    next I_XDataLen
    I_XDataLen = 63 ' lost characters, but do the best we can
GetChar2Valid:
Timeout2:
    I_XDataBuf[I_XDataLen] = 0
    if I_XDataLen > 0 then
        XDataSource = 2
        XDataFlag = 1
    endif
GetChar2_Return:
    if PIR3.5 then HSERIN2 [I_XDataChar]
@ INT_RETURN
;--------------------------------------------------------------------

Overint:

  PIR3.5 = 0
@ INT_ENABLE RX2_INT

YOUR CODE HERE