SOUND makes LCD quit working

[Rob]

Hi,

I'm not sure if that's your whole code or not. You should really have a small delay before your program starts to allow the Power supply to settle properly. There should also be a delay for the lcd to initialise properly before sending data to it. These are unlikely to be the cause of your problem but it's good practice. Try placing a PAUSE 500 before you send PORTB.4 high. 500ms delay before writing to the LCD should be enough time for the majority of LCDs to intialise correctly.

When you say power the LCD from PORTB you're not talking about the backlight as well are you? The PIC pins can only supply 25mA and some LCDs can take a lot more than that to light.

Just to check, PORTB.6 is not accidentally connected to one of the LCD pins is it?

Cheers

Rob

[mister_e]

at the end of your program, you should or finish by a STOP command or with an endless loop, unless your PIC may behave in a weird way.

Here:   GOTO Here

You may also need to check if ALL ADCs and comparators are disabled. Here i see 2 missing lines

ANSELH = 0
CM2CON0 = 0

And then what you drive and how, may help us to go deeper in our understanding.

HTH

[jderson]

Thanks for the help! The ANSELH = 0 line fixed the problem! This is a small part of my program. As I use PORTC to control the LCD, it's a wonder this hasn't caused more problems before now. I thought I RTFDS enough, but apparently not! Thanks again.