Lpc2000

Solved the problem. My serial protocol used Break's to indicate NAK's.
All of the nodes detected bad packets together and set the break but
my bottom half processing of breaks which clears the breaks wasn't
executing. That's why the pin was held low.

--- In lpc2000@yahoogroups.com, "sengoontoh" <sengoontoh@y...> wrote:
> I'm experiencing a weird phenomenon. I have THRE and RX interrupts
> going on in the IAR compiler. After some very busy activity, all of a
> sudden the TX pin gets stuck at low (mark). The weird thing is I have
> 3 boards sitting on the same serial bus and all of them do it at the
> same time. It stays this way till reset. Nothing happens even if I try
> to fill up the transmit buffer. It could be a problem on my board I
> would have to look further but anyone have any suggestions?
> 
> Thanks