How instant are Instant Interupts?

[Bruce]

I cant find my reciepts or proof of purchase anywhere to get the upgrade

If you bought PBP from us, we can look it up for you, and send you a copy of your original
receipt.

Most other distributors should be able to do something similar to help you get the upgrade.

[jmgelba]

Part of this project is obviously timing.

Say I have a pulse coming in at between 50 and 200uS and I need to match this incoming pulse to an output. Not really a problem.

IF PORTA.0 = 1 THEN PORTA.1 = 1

But what if that incoming pulse is longer than the 200uS and the output must be shut off after a predetermined maximum, lets say 1000uS?

IF PORTA.0 = 1 THEN PORTA.1 = 1 no longer works. TMR0 has to be triggered at the same time as PORTA.1 goes high, then needs to count to a maximum of 1000uS and make PORTA.1 = 0.
PORTA.1 then must be kept low until PORTA.0 has gone low.
When PORTA.0 = 0 TMR0's flag can be reset and wait for PORTA.0 to go high again. If PORTA.0 has gone low before TMR0 has set the flag, it must be reset and ready to count to 1000uS.

Does this make sense?

[Darrel Taylor]

If you're doing it with software polling, timers don't add much value unless you plan on doing other things at the same time. But all that really makes things complicated.

So here's a simple example that does the same thing with pauseus instead of a timer.

Delay = 1000

Wait4Pulse: 
    IF !PORTA.0 THEN Wait4Pulse     ; Wait for incoming pulse
    PORTA.1 = 1                     ; Start Output pulse
    PAUSEUS Delay                   ;   pause for pulse width
    PORTA.1 = 0                     ; End of Output pulse

Wait4PulseEnd:                      ; Make sure input pulse is finished
    IF PORTA.0 THEN Wait4PulseEnd

GOTO Wait4Pulse

[jmgelba]

DT, that wont work. The output has to reflect the input up to a maximum on time then the output has to be turned off regardless of input state.

Delay = 1000

Wait4Pulse: 
    IF !PORTA.0 THEN Wait4Pulse     ; Wait for incoming pulse
    PORTA.1 = 1                     ; Start Output pulse
    PAUSEUS Delay                   ;   pause for pulse width *** this will keep the output on for 1000uS, not for the duration of PORTA.0 = 1
    PORTA.1 = 0                     ; End of Output pulse

Wait4PulseEnd:                      ; Make sure input pulse is finished
    IF PORTA.0 THEN Wait4PulseEnd

GOTO Wait4Pulse

[Darrel Taylor]

DT, that wont work. The output has to reflect the input up to a maximum on time then the output has to be turned off regardless of input state.

Now you tell me!
That wasn't part of the plan.

The schematics above don't apply then. Nor does the example.
<br>

[jmgelba]

2 different projects/ideas.

This last one has nothing to do with the first one. Its a pulse follower with a protective cut off.

[jmgelba]

I am still very interested in the first one and looking forward to taking a look at the code.

The second one was me trying to learn timers and how to manipulate them.