XRDY bit not being set | 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 everyone,

I have a SPI port that behaves nicely the majority of the time.  I can
transmit and receive without any problem, but once in a blue moon my
transmit routine will mysteriously hang waiting for the XRDY bit to be
set.

The c54 is the master and there is only one slave (an MSP430).  I just
don't see, if the c54 is the master, how the XRDY bit would ever not
be set soon after I write to the DXR register.

Is there something that can prevent the SPI port from transmitting?=20
The port is not in reset and the transmitter is enabled.  All clocks
are generated internally.  The XEMPTY bit is set (which means, I
think, that the last word I wrote to the DXR is still sitting in the
XSR).  What is it waiting on?

Any ideas?

Thanks,

Jason

Check Out Industry=92s First Single-Chip, Multi-Format, Real-Time HD Video =
Transcoding Solution for Commercial & Consumer End Equipment: www.ti.com/dm=
6467

=20

(You need to be a member of c54x -- send a blank email to c54x-subscribe@yahoogroups.com )

Nevermind.  This was an illusion created by the debugger environment.  When
stepping through the code, I wasn't giving the c54 enough time to shift the
data out before rechecking the bit.

Jason

-----Original Message-----
From: c...@yahoogroups.com [mailto:c...@yahoogroups.com] On Behalf Of
jdbwillia
Sent: Tuesday, January 08, 2008 5:38 PM
To: c...@yahoogroups.com
Subject: [c54x] XRDY bit not being set

Hi everyone,

I have a SPI port that behaves nicely the majority of the time.  I can
transmit and receive without any problem, but once in a blue moon my
transmit routine will mysteriously hang waiting for the XRDY bit to be set.

The c54 is the master and there is only one slave (an MSP430).  I just don'=
t
see, if the c54 is the master, how the XRDY bit would ever not be set soon
after I write to the DXR register.

Is there something that can prevent the SPI port from transmitting?=20
The port is not in reset and the transmitter is enabled.  All clocks are
generated internally.  The XEMPTY bit is set (which means, I think, that th=
e
last word I wrote to the DXR is still sitting in the XSR).  What is it
waiting on?

Any ideas?

Thanks,

Jason

Check Out Industry=92s First Single-Chip, Multi-Format, Real-Time HD Video =
Transcoding Solution for Commercial & Consumer End Equipment: www.ti.com/dm=
6467

=20

(You need to be a member of c54x -- send a blank email to c54x-subscribe@yahoogroups.com )

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Discussion Groups | TMS320C54x | XRDY bit not being set

XRDY bit not being set - jdbwillia - Jan 9 7:28:50 2008

RE: XRDY bit not being set - Jason Williams - Jan 10 8:48:22 2008