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Hello PCM,
I'm doing GPS data logger which display lat/long at LCD and connected laptop's usb cable for navigation. I add LCD for displaying lat/long when GPS isn't connected to laptop.

...

do
{
delay_ms(500);
while(bkbhit)
putc(bgetc());

} while (TRUE);

Delete the two lines in bold.

I delete these two lines, but it doesn't work.

That circuit only affects the backlight. You don't need the backlight
to be working. The LCD will run without it.

Did you do you all the things I listed in my post below?
http://www.ccsinfo.com ...

Hello, PCM

I connect series LED resistor 15 ohm, 0.5W and do anything you suggest but it doesn't work. what is next your idea ?

Thank you very much.

Thank you PCM,

I adjust Vo to 0.5V and leave DB0-DB3 floating but they aren't pulled up to +5v. Their voltage are about 0.25V

I notice that there are two resistors on LCD module connecting from ...

1. the lcd does not initialise at all, otherwise the black line will disappear.
in the lcd driver, place some delays between i/o activity like:

output_b (nibble);
delay_us(1);
...

LCD appears black squares when adjusting POT to maximum value (Vo=0V). In LCD datasheet, Vo value that LCD works properly is 4.2V. When I adjust POT to this value, It has no black square on screen. W ...

That is basically the way I have my LCD (CrystalFontz in this case) connected although D0-D3 are not connected. Just out of curiosity, how did you count the pin numbers on the connector ? They alter ...

In addition to the comment above on D2, make sure you have power and ground to the display correctly (favorite trick is to hook up data/control lines and forget power and ground ... very odd things ha ...

C. Don't connect anything to pin A2 on the PIC.

I think you meant pin D2. right?

did you try the default <lcd.c> routine? is it working?
your code looks fine, try re-checking your connec ...

I compile with PCWHD 4.068

Hello, I'm testing my LCD 16x2 (ABC016002A07-GHY) with PIC16F877A and flex_led.c driver but it's not work (appear black square in first line). I try these method below but it's not work.

1. Increas ...