I can not figure out an LCD issue

[Acetronics2]

The following works for me using an EasyPIC5 board with the LCD on PORTB, .

Hi, Lili

Me too with a 16F628 @ 8Mhz ... same board.
"LCD on Anypin" mods implemented ... but not used here.

may be the missing LCD Settling time @beginning of the program ???

Alain

[lilimike]

Dave,
I have tried
DEFINE LCD_COMMANDUS 1000 and 4000
DEFINE LCD_DATAUS 25 and 100
with no aparent changes.

Malcom,
The display does work at 8 MHz with a 4 MHz resonator but the chip's timing is doubled and that is what I am trying to figure out. so a PAUSE 1000 will last 2 seconds instead of 1 second. The timing for this project is important because I want to build an ultrasound distance mesurement and so I have to time the echo received after sending an output burst of 40 KHz. I think I am far from my goal but I can't get started with the fun part untill I have figured out my issue with the timing problem.

Alain,
What did you mean by this?

may be the missing LCD Settling time @beginning of the program ???

For the record this is my hardware configuration and with an oscilloscope I see the 5V as pure DC 5.12V

[lilimike]

Ok so here is a positive update...

I had removed my resonator last night to rule it out and got the same issue with the chip's internal oscilator. Today I just put back the resonator and set _XT_OSC again and now it is working fine at 4 MHz.

Furthermore...! if I remove the LCD_Anypin, it is now still working with the standard version.

So please correct me if I am wrong but I am working with a breadboard and I suspect when I had the resonator at first, there was a bad contact with one of its pin!

Thanks to all for your responses, it kept me going.

Mike

[mackrackit]

Yup
A bad connection will make all kinds of strange things happen.

[malc-c]

Mike,

Not sure if I'm correct, but I seem to remember reading that solder less breadboards can cause issues as they can have a high capacitance. Maybe this was part of the problem causing the timing issue.

Glad to hear you have this part resolved and best of luck with the rest of your project

[Acetronics2]

Alain,
What did you mean by this?

Quote:
may be the missing LCD Settling time @beginning of the program ???

Hi, I just mean place a pause 500 to 700 ms before sending the very first command to the LCD.
just to let it be ready for receiving infos ...

Moreover

DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 50

are the correct value for LCDs

in case of using OLEDS ... add 50% to both !!!

Alain