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Got it~~!

thx a lot everyone! Very Happy

Hello all~

I am doing a project implementing button RBO ext interrupt. Now I am facing debouncing problem.

Can anyone show me how to write the algorithm of debouncing?

Thx a lot!!

I connect my RB0 to a normally-open push button. This connection is correct right?

................ __
RB0 --------o o-------- Gnd
............pus ...

You don't have anything else attached to portb do you? Namely RB0? I tried an experiment with a PICDEM2 Plus board. RB0 has an LED on it along with RB3-RB1. I wanted to use one of the another LEDs b ...

My port RB0 is initially high(5V). It turns to low when I press the button. I have set the port_b_pullups but still cannot work... Crying or Very sad

........
found_it = false;
set_tris_b(0x01&# ...

#include <16f877a.h>
#fuses HS,NOLVP,NOWDT,PUT
#use delay(clock=20000000)

int1 found_it;

#int_ext
void ext_isr()
{
found_it = true;
}

void main( ...

Thx asmallri ~ Very Happy

The code works. However, the "bit found_it;" cannot be declared. I change it to "boolean found_it;" and it works.

Anyway, I wonder why my code is not working since both ...

That's mean I use the interrupt subroutine only to set the flag and the all the work for interrupt will be done in main()...

Thx Mark, I think I get your point~~ Very Happy

Hello all~! I am a student and currently I am doing a project using RS232 interrupt. I did a test on this (code below) and found that the interrupt was working only for the first time. When it returne ...

Thx Mark~ ^^

Okay for a program but you shouldn't do them in an interrupt.

One more question. What should I do if I need to implement delay in intterupt?

Thx.

5. Never put those huge delays in there. Better to set a flag and handle in main.
6. Better use "ERRORS" in the #use RS232 if using the hardware uart.

Sorry guys for interrupt~ I have some d ...