Hi all,

I'm trying to implement a glueless RS232 interface to SPORT0 on my=20
21065L.  My code is based on the ee-191 engineer to engineer=20
note, "Implementing a Glueless UART Using The SHARC=AE DSP SPORTs ".   =
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I've tied the RFS0 and DR0A pins together.  The problem is that the=20
SPORT will occasionally lock up while receiving data from a PC over=20
the RS232 interface.  I have to reset the SPORT to start receiving=20
data again.

I've reduced the application to a simple loop in main that polls the=20
SRCTL0 register for a "not empty" condition and reads the RX0A=20
buffer.  I send in a bit stream from the PC and the SPORT will lock=20
up after several seconds.

Just as a test, I set the RFSR bit to 0 in the SRCTL0 register to=20
ignore frame syncs after the initial one.  The SPORT will run=20
indefinitely.  This leads me to the conclusion that there maybe=20
something wrong with tying the frame sync input to the receive input=20
and that there may be some sort of timing violation that causes the=20
SPORT to lock up.

Have you heard of this or any other similar issue?

Thanks,
Rob

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