[ECOS]interrupt mask in device at91serial.c

[Bob Brusa]

Hi
I know its possible to configure the serial H/W to handle a driver signal  
to serve an RS485 bus. Unfortunately, our board has the driver pin on a  
different port and therefore I had to do the trick by software.

I have modified at91serial.c that when ENDTX happend, it enables TxEMPTY  
interrupt and then if TxEMPTY happens, a private (configurable) callback  
routine is invoked. The driver works fine this way - unless there is the  
case that a transmitted message remains without answer. Then, upon the  
next send, I can see that my software sets the driver on but something  
puts it back imediately (app 230 us). This happens even before the first  
character is on line. But it is clearly related to the call to

cyg_io_write(..

However, I can not find where the TxEMPTY interrupt is enabled. Is there a  
at91serial.c-Guru somewhere who could give me a hint where this happens  
and how I could fix it. Thanks and regards
    Robert
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