Matrix Orbital Corp

Hello,

I have a serious problem with the LK 204-25 and the Starterkit STK500 from Atmel.

I wrote an Assemblerprogram for the AT90S8515. It sends the string "Test!" periodically to the UART. When I test it with Hyperterminal on my PC everything is working fine. But when I plug the LCD to the uC-Board nothing happens. So I thought that anything is wrong with the LCD. But
when I test it with Hyperterminal, the LCD works fine too. So I have three working components, but the STK500 doesn't work with the LCD. The Baud-Rate is set to 9600, 8 Databits, no parity, 1 stopbit, no flow-control.
The only thing that happens is that the Cursor on the LCD is a little bit flickering.

I also tried to connect the Ground from the STK500 with the Ground from the LCD but nothing happens.

Do you have any ideas about this problem??? I tried to fix this since two days. Please help me.

Thank you.
Robert

Our default baud rate is set to 19200 baud...Make sure your uC baud rate matches the display...

The Baud-Rate is set right. What else could cause that problem??

Is your uC ouputting RS232 or TTL levels...?

I think its RS232. Must it be RS232???

Here is a schematic form the Serial-Port of the STK500:

http://www.fh-augsburg.de/~roke/Serial.jpg

It runs!!!!!!!!!!!!!!!

My problem was, that Pin2 of the uC-Board is an output and Pin3 is an input. So I have to change these Pins and everything works fine

Thank you very much for the friendly help!!

That is good to hear you got your display working. If you have anymore questions or concerns, let us know.