Strange behavior with PIC16F877

Hello,

I hope that a I'm not missing something stupid, but I'm trying a simple circuit. I have a keypad and when pressing the '#' key, the PIC should invert the LEDs states.

What is happening is that the LEDs are initiating in the correct state (so it seems the HEX file was uploaded and the code is working), but when I press the button nothing happens. I don't know what I'm missing here, hope you can give me a hint

Thanks!

P.S.: I've tested the code in Protheus (and it works fine), but I'm thinking in change the simulation software from my classes to yours since yours is Free!

Hi.

I will have a look.

Thanks for reporting.

Hello!

Did you managed to take a look at what is happening? Could you replicate the problem?
If you didn't had the time, don't worry, it's not something urgent, I can wait xD

Hi.

Without source code it takes longer to test.

Looks like the problem is resistors too low value, then voltage at PORTB.0 doesn't drop below 1.25V (low level).
It works for me with 1K resistor for example.

I just kept thinking about the software and totally forgot about the electronics! Of course, changing the resistors values worked for me too...

Thank you very much for your attention!