Instant Interrupts - Revisited

[savnik]

So far I've shown one interrupt source being used at a time, but as I said in the first post, you can easily service Multiple Interrupt Sources.   So what if we wanted to join the previous 3 examples into one program.   NOT a problem!

To add more interrupt "Handlers", simply add them to the INT_LIST, and create a subroutine for them.

Since both the Blinky Light, and Elapsed Timer used TMR1, lets move the Blinky Light over to TMR0. Elapsed will still use TMR1.

<font color="#000000"><b>LED1   </b><font color="#008000"><b>VAR  </b></font><b>PORTD</b>.<b>0
LED2   </b><font color="#008000"><b>VAR  </b></font><b>PORTD</b>.<b>1

</b><font color="#008000"><b>INCLUDE </b></font><font color="#FF0000">&quot;DT_INTS-14.bas&quot;     </font><font color="#0000FF"><b><i>' Base Interrupt System
</i></b></font><font color="#008000"><b>INCLUDE </b></font><font color="#FF0000">&quot;ReEnterPBP.bas&quot;     </font><font color="#0000FF"><b><i>' Include if using PBP interrupts
</i></b></font><font color="#008000"><b>INCLUDE </b></font><font color="#FF0000">&quot;Elapsed_INT.bas&quot;    </font><font color="#0000FF"><b><i>' Elapsed Timer Routines

</i></b></font><font color="#008000"><b>ASM
</b></font><font color="#000080">INT_LIST  macro    </font><font color="#0000FF"><b><i>; IntSource,        Label,  Type, ResetFlag?
        </i></b></font><font color="#000080">INT_Handler    INT_INT,  _ToggleLED1,   PBP,  yes
        INT_Handler   TMR0_INT,  _ToggleLED2,   PBP,  yes
        INT_Handler   TMR1_INT,  _ClockCount,   PBP,  yes
    endm
    INT_CREATE               </font><font color="#0000FF"><b><i>; Creates the interrupt processor

    </i></b></font><font color="#000080">INT_ENABLE   INT_INT     </font><font color="#0000FF"><b><i>; enable external (INT) interrupts
    </i></b></font><font color="#000080">INT_ENABLE  TMR0_INT     </font><font color="#0000FF"><b><i>; enable Timer 0 interrupts
    </i></b></font><font color="#000080">INT_ENABLE  TMR1_INT     </font><font color="#0000FF"><b><i>; Enable Timer 1 Interrupts  
</i></b></font><font color="#008000"><b>ENDASM

</b></font><b>OPTION_REG </b>= <b>OPTION_REG </b>&amp; <b>$80 </b>| <b>1  </b><font color="#0000FF"><b><i>; Set TMR0 Prescaler to 256, leave RBPU alone
</i></b></font><font color="#008000"><b>GOSUB </b></font><b>ResetTime              </b><font color="#0000FF"><b><i>' Reset Time to  0d-00:00:00.00
</i></b></font><font color="#008000"><b>GOSUB </b></font><b>StartTimer             </b><font color="#0000FF"><b><i>' Start the Elapsed Timer

</i></b></font><b>Main</b>:
    <font color="#008000"><b>IF </b></font><b>SecondsChanged </b>= <b>1 </b><font color="#008000"><b>THEN  
       </b></font><b>SecondsChanged </b>= <b>0
       </b><font color="#008000"><b>LCDOUT </b></font><b>$FE</b>,<b>$C0</b>, <font color="#008000"><b>DEC </b></font><b>Days</b>,<font color="#FF0000">&quot;d-&quot;</font>,<font color="#008000"><b>DEC2 </b></font><b>Hours</b>,<font color="#FF0000">&quot;:&quot;</font>,<font color="#008000"><b>DEC2 </b></font><b>Minutes</b>,<font color="#FF0000">&quot;:&quot;</font>,<font color="#008000"><b>DEC2 </b></font><b>Seconds
    </b><font color="#008000"><b>ENDIF
GOTO </b></font><b>Main

</b><font color="#0000FF"><b><i>'---[INT - interrupt handler]---------------------------------------------------
</i></b></font><b>ToggleLED1</b>:
     <font color="#008000"><b>TOGGLE </b></font><b>LED1
</b><font color="#000080">@ INT_RETURN

</font><font color="#0000FF"><b><i>'---[TMR0 - interrupt handler]-------------------------------(Blinky Light)------
</i></b></font><b>T0Count  </b><font color="#008000"><b>VAR WORD
</b></font><b>ToggleLED2</b>:
    <b>T0Count </b>= <b>T0Count </b>+ <b>1
    </b><font color="#008000"><b>IF </b></font><b>T0Count </b>= <b>512 </b><font color="#008000"><b>THEN </b></font><b>T0Count </b>= <b>0 </b>: <font color="#008000"><b>TOGGLE </b></font><b>LED2
</b><font color="#000080">@ INT_RETURN
</font>

<font size=-2>Code Size = 711 Words</font>

Now we have all three interrupt sources working together in the same program.

LED1 responds to the external INT
LED2 flashes, timed by TMR0
and, the elapsed timer is maintained via TMR1

And, all of this is happening behind the scenes of your normal PBP program.

I test for 16f877a and it's work.
But for the 18f88 i got the message : Symbol not previously defined (T0IF)
and not compile.Why;

[skimask]

I test for 16f877a and it's work.
But for the 18f88 i got the message : Symbol not previously defined (T0IF)
and not compile.Why;

That would be a good trick....compiling for an 18F88. I can't seem to find it on the Microchip website.

Try TMR0IF (a zero after TMR). Or you don't have an up-to-date version of PBP.

Previous Release: 2.45

* Adds support for PIC12F508, 509, 683, PIC16F505, 684, 688, 716, 737, 747, 767, 777, 87, 88, PIC18F2331, 2431, 2515, 2525, 2585, 2610, 2620, 2680, 4331, 4431, 4515, 4525, 4585, 4610, 4620, 4680, 6410, 6490, 8410 and 8490.

[savnik]

Previous Release: 2.45

* Adds support for PIC12F508, 509, 683, PIC16F505, 684, 688, 716, 737, 747, 767, 777, 87, 88, PIC18F2331, 2431, 2515, 2525, 2585, 2610, 2620, 2680, 4331, 4431, 4515, 4525, 4585, 4610, 4620, 4680, 6410, 6490, 8410 and 8490.

I have 2.46

[skimask]

I have 2.46

Well, if TMR0IF (or T0IF for that matter) doesn't work, then just change the code to access the interrupt flag bit directly from the applicable register.

[Darrel Taylor]

Microchip can't make up thier mind on what they want to call things. In most 16F's it's called T0IF, and in the 18F's it's TMR0IF, but for some reason, in a 16F88 it's also called TMR0IF. It's the same with the T0IE/TMR0IE.

Fortunately, we aren't stuck with whatever they decide to call things.

Just add the 2 highlighted lines, and you should be fine. (no spaces before them)

ASM
T0IF = TMR0IF
T0IE = TMR0IE
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler    INT_INT,  _ToggleLED1,   PBP,  yes
        INT_Handler   TMR0_INT,  _ToggleLED2,   PBP,  yes
        INT_Handler   TMR1_INT,  _ClockCount,   PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor

    INT_ENABLE   INT_INT     ; enable external (INT) interrupts
    INT_ENABLE  TMR0_INT     ; enable Timer 0 interrupts
    INT_ENABLE  TMR1_INT     ; Enable Timer 1 Interrupts  
ENDASM

[savnik]

Thank you.
Now it's work.