Detecting PORTA Buttons

[Suraj143]

Hi all!

RA4, RA5, RA6 is my input buttons they are active LOW inputs.

In my earlier post guys suggested me to detect/read the whole PORTA using this command.

	movf	PORTA,W

This method is good when inputs coming from a digital IC. But when I giving inputs from switches the above command not working. So I have to check all three buttons individually.

Is there any method to detect two or three buttons at a time? It means

*when I press RA4 & RA5 both only the output LED1 lights up.
*When I press RA4, RA5, RA6 only the output LED2 lights up.

Thanks

 

[bananasiong]

Hi all!

RA4, RA5, RA6 is my input buttons they are active LOW inputs.

In my earlier post guys suggested me to detect/read the whole PORTA using this command.

	movf	PORTA,W

This method is good when inputs coming from a digital IC. But when I giving inputs from switches the above command not working. So I have to check all three buttons individually.

Is there any method to detect two or three buttons at a time? It means

*when I press RA4 & RA5 both only the output LED1 lights up.
*When I press RA4, RA5, RA6 only the output LED2 lights up.

Thanks

This sounds the same as your previous post.
I think I know why yours wasn't working. You're using active low input, so instead of
xorlw b'01110000' (this is for active high input)
try
xorlw 0x00
and of course, don't forget to take only bit 4 to 6 by AND function before XOR. Try it.

 

[Suraj143]

Wow Bnanasiong you are great it realy worked well after changing values to XORLW 0X00.

Actually I missed that Logic.Now everything is OK & works fine.
Now its easy to read a PORT in any manner.

Thanks a lot Bananasiong