display problems on LK204-25

fred_ · Post by **fred_** » Mon Jun 24, 2002 7:28 am

Hello,

I'd like to build an mp3 car player
and I need to display informations on
my LK204-25.
I tried a simple C program under Linux
juste writing a string to the serial port.
With my Laptop it works perfectly, but
with my future mp3 player it doesn't
work. Insted it displays odd characters.

Any ideas ?

Post by **Henry** » Mon Jun 24, 2002 7:33 am

All I can think of right of the bat:

1. Speed issues (on is not set right)
2. Poor grounds
3. Noise?

fred_ · Post by **fred_** » Mon Jun 24, 2002 8:06 am

- The speed is set up into my short C program
- for the mass it is the same in both
cases, I take it directly on the motherboard
with the +12v. I just shift the DB9 connector
to my laptop.
- for noise why should I have more noise
on my pc board than on my laptop.

Post by **Henry** » Thu Jun 27, 2002 1:55 pm

The only thing left I can think of is ground.. make sure you are using the computers ground and not the LCDs... meaning ground from the LCD should be going to the computer and then to ground.

fred_ · Post by **fred_** » Fri Jun 28, 2002 12:51 am

I finally found a solution,
just putting a tempo of 100 us just after the write and it works.