Getting Stuck in loop

[Frozen001]

How neat the signal on PORTA.5 is? Where this signal come from?

Looking at the signal in question on an o-scope, It looks pretty clean to me. It is connected to a 100K pull-up to 5V. The transition from high to low does have some ringing , that lasts about 90nS give or take, but the peaks are all < 0, so it should still be seen as a low.

[mister_e]

Reduce it!!! Let's say ~1-10K pull-up.

AND, wait a few Usec after you detect the falling edge...

[Frozen001]

Reduce it!!! Let's say ~1-10K pull-up.

AND, wait a few Usec after you detect the falling edge...

Wiat let me correct that... I just looked at the schematic, there is not a pull up on PortA.5. Sorry about that, I did not do the hardware, I am just doing the programming.


I have a 3uS pause after the falling edge (was 1uS, but Alain correct me on that already)

Thanks for all your help so far guys...

I am still learning this digital stuff, and have been slowly making my way up the hill.

[Bruce]

A floating input would for sure screw-the-pooch since it returns a random value when
the port pin is read...;o}

[sayzer]

Looking at the first post,

I think this could be the issue here.

X var PORTA.5
Y var PORTF.6


REPEAT
UNTIL x = 0  ' X = 1 ;  wait until it is 0.

High y       ' Here, X = 0.

while x = 0 : wend  ' Here, X = 0, wait until it is 1.

REPEAT
UNTIL x = 0  ' X = 1 ;  wait until it is 0. 
        Pauseus 1
		Location1=PortJ

while x = 0 : wend  ' Here, X = 0, wait until it is 1.


REPEAT
UNTIL x = 0         ' X = 1 ;  wait until it is 0. 
        pauseus 1
		CharLow=PortJ

while x = 0 : wend  ' Here, X = 0, wait until it is 1.

REPEAT
UNTIL x = 0
        pauseus 1
		CharHigh=PortJ
		
while x = 0 : wend  ' Here, X = 0, wait until it is 1.

------------

[Frozen001]

sayzer:

I'll give it a try and see if that helps...

[Frozen001]

sayzer:

I'll give it a try and see if that helps...

I made the change and it made no difference at all.