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Blackfin SPORT sending junk

Question asked by goldscott on Oct 26, 2011
Latest reply on Nov 29, 2011 by Prashant

Hi All,




I'm using DMA6 to send data out the SPORT1TX to an FGPA.


Internal frame sync generation (no frame sync actually needed). Clock rate is 2400 bps (slow!).

Words are 11 bits, LSB first.


The SPORT is sending a garbage word before sending the first data word.

The first five words I'm sending out are 0x7FF.

Attached is a grab from my logic analyzer showing 12 bits of junk (0011 1111 1111) sent before real data is sent.

I've tried various SPORT settings to no avail. Any ideas?