lcd interfacing

abhay wrote:
> hi  .i m  interfacing 16x2 lcd to my P89LPC935 but i m unable to get
> the desired output.i hav tested many times and also the program is
> correct as i m able to debug it & observe the output correctly.i hav
> also replaced my lcd one time. i m using HY-1602F6 lcd module.i hav
> checked my pin configurations again & again but the lcd is just
> flashing with backlight voltage input pins.
> i m getting only blocks of one row display with no character when i
> change the contrast.
> 
> Could anyone helpme out in this as i hav to complete my project with
> this lcd module soon .also i would be thankful if anyone could suggest
> anyother lcd module for reliable & low cost operation.
> 
By no means an expert, but on 2 different controllers I have had to put 
a 5ms delay after raising the R/S pin.  The display controllers would 
always treat the data as a command unless I put this delay in place. 
This was even with the code supplies by Microchip Application Maestro (I 
use PICs).

hi guys.... thanks for ur response.........i tried with the following
new modifications.

power on reset delay of 50ms
vss connected to gnd thru pot.
i had tried this lcd module with delay as well as by polling busy
flag.but it has not changed anything.

i got another lcd of  jhd162a  but later noticed that it is based on
same controller (ks0066).
however i m trying on that rite now with these new modifications.one
thing that i m not getting is that why this lcd is displaying bricks of
only one line

abhay wrote:
.one
> thing that i m not getting is that why this lcd is displaying bricks of
> only one line

These is not much point in responing to you if your not going to read
the responces.

lcd has started working.the actual problem was that the ground of micro
& lcd was not common.thanx for ur suggestions.also the power on reset
delay concept proved helpful.

i hav been able to programmed lcd and able to work through it by delays
& polling for busy flag.i need to interface one keypad & lcd to my
microcontroller p89lpc935.i am getting output on lcd when i press keys
on the keypad & output is correct also.but i am not able to do the same
through interrupt programming of keypad.i have enabled appropriate bits
for interrupt programming.

also i am able to do keypad through interrupt & watch its output on my
hyperterminal window .......but it is not showing on lcd.

can u suggest reason for the same