Hello all,

After reporting that my TX routine did work I started on my RX routines.
During testing I found out that the TX routine didn't work correctly at all.

When I place 10 bytes in one time (faster then transmitting is possible) and initiate transmitting it sometimes occurs that a character is destroyed. Every second 10 more bytes are placed in the buffer. When I monitor the two offsets and the TX_busy flag everything seems to be working fine.I placed my code on a 8051 user homepage I created for this purpose because copy and paste in this message messed up the source.I hope that's okay....
the link is :

http://www.8052.com/users/peterhuijssen/

I wrote the code according to the example of Erik. It's in Bascom basic, I hope you don't mind. Again : after I finish some running projects I'm going to learn C.

The baudrate settings and all other settings work correctly.

The transmitted pattern (viewed in HyperTerminal, not not the best program... I know....) should be :

<23456789:;

Sometimes in various places in the pattern a byte is different but only one byte is different at the time

I have searched my head of but I can't find the mistake I'm making

Thanks in advance for any help

Peter