McBSP as UART | TMS320C54x

Technical discussions about the TI C54x DSPs (including the c5401, c5402, c5402a, c5404, c5407, c5409, c5409a, c5410, c5410a, c5416, c5420, c5421, c5441, c549, c5470 and c5471).

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Hi,

I've followed the directions in SPRA661 to implement a software UART using
the McBSP port 0.  I am using a C5416 device and modified the included
assembly slightly to allow for using a far memory model.  Things work okay
for the most part, but I am experiencing parity and framing errors every now
and then when transmitting to the DSP.  Sometimes I can transmit 100 or more
characters without a problem but sometimes the errors occur more frequently.
Initially I was operating the DSP at 160MHz and the UART at 57600 but then
tried operating the DSP at 32MHz and the UART at 9600 with no improvement.
I'm using a very short cable to the serial port of a PC so there shouldn't
be any signal integrity issues there.  I tried one PC running HyperTerminal
under Windows 2000 and another PC running minicom under Linux - but the
computer used made no difference.  I used an oscilloscope to make sure that
my calculated DIV value resulted in as close as possible to the desired baud
rates - at 9600 I had only a 0.2% difference.

I'm hoping someone has experienced this before and might have some
suggestions.

Thanks,

Andrew Ness
a...@usultratek.com

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Discussion Groups | TMS320C54x | McBSP as UART

McBSP as UART - Andrew Ness - Jun 14 22:22:38 2006