Having some trouble getting this silly thing to go off.

Here's my set up code:

-----------------
  TMR1H = TMR1L = 0;    // reset TMR1
  TMR1ON = 0;           // TMR1 Off
  T1CON = 0x06;         // TMR1 = No sync, external clock
  TMR1ON = 1;           // TMR1 On
  CCP1CON = 0x0A;               // Set CCP1 to compare mode, software
interrupt
  CCP1IF = 0;           // clear CCP1 flag
  CCP1IE = 1;           // enable CCP1 interrupt
  GIE = 1;                      // enable interrupts
-----------------

I have a rotary encoder on RC0 providing the clock input, it puts out a
0-5V signal per pulse and is verified working.

I receive a serial packet telling to advance or retard the motor, and
how far.

I then reset TMR1, set the desired amount of pulses in CCPR1H:L, then
enable the motor, as shown in the snippet below.

-----------------
    case ADV_AIRGAP:                    // advance the airgap
      TMR1H = TMR1L = 0;                // reset TMR1
      CCPR1H = serialPacket[1];
      CCPR1L = serialPacket[2]; // set desired pulse count
      M_DIRECTION = FORWARD;            // forward motion
      M_ENABLE = GO;                    // enable the airgap motor
      break;
------------------

But I'm not getting a CCP1IF interrupt, I've tried manually clocking the
RC0 input, no luck.  Looking at Microchip's Capture App Note doesn't
really help me much as it doesn't describe why/what it's doing.

I'm worried that since I am running the clock input as asynchronous, I
may be missing the compare I want as it clocks at a different rate than
the PIC is clocked at.  Not sure how to really overcome that though,
possibly by simply checking TMR1 constantly til >=, but that seems like
a hokey way of doing Compare.

Ideas?

nick@veys.com / www.veys.com

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