LCDOUT not working at 16mhz oscillator speed.

[tumbleweed]

That osccon looks pretty dodgy

+1

You're enabling the PLL with an osc freq of 16MHz, so it's trying to run at 64MHz.
The max for that chip is 32MHz.

[CuriousOne]

Well it runs, and runs on 16mhz, I judge this by issuing HPWM 2,127,1000 statement, and measuring output frequency
If I leave OSCCON same and set DEFINE OSC to 32mhz, then it outputs 500hz.

[CuriousOne]

Changed: OSCCON=%01111011

Now LCD works on 16mhz, but still misbehaves sometimes - displayed characters get distorted, say you send text "TEST TEXT" and some letters will be replaced with garbage from user character area. I tried adding filtering capacitors/etc - no luck.

[mpgmike]

You don't want filtering caps on communications lines, you want the high-low-high transitions as crisp as possible. If anything, you may adjust the SLRCONx settings.

[CuriousOne]

LOL I'm not adding filtering caps to data lines. I'm adding them to power lines

[tumbleweed]

Looking at the library code, if the clock is set for > 16MHz (or 24MHz in some cases) it uses a longer internal delay before asserting some of the control pins.
Try this - lie to the compiler and tell it you're running faster than you really are:
DEFINE OSC 32 'set oscillator speed

Don't change your OSCCON setting... leave it so you're still actually running at 16MHz.

[CuriousOne]

Yes I already tried that and it works just fine, but it messes up with all other timing settings in my code, which is about 16K.
Is there any way to adjust the library settings?