Experimental Physics and
Industrial Control System

"Szalata, Zenon M." <[email protected]> · Fri, 18 Jul 2008 11:37:37 -0700

I am trying to implement code to do DMA data transfer from a VME module to mv6100 local memory using vxWorks routines: sysTempeDmaStart and sysTempeDmaStatus.  sysTempeDmaStart completes with status 0, which should be success.  It returns in the TEMPE_DMA_STATUS structure the following values:

  dmaDone=0					is this a failure?
  dstax=0x1000000				is this contents of the tempe status reg?
  dcsaUx=0x0
  dcsaLx=0x94080000			this is source address
  dcdaUx=0x0
  dcdaLx=0x29ae860			this is the destination address
  dclaUx=0x0
  dclaLx=0x0
  dcntx=0x54000				this is the remaining byte count
  timeBaseU=0x23				?
  timeBaseL=0x5e51d6f9			?

Because I set the userHandler=WAIT_FOREVER in structure TEMPE_DMA_ATTRIBUTES, I think that dmaDone=0 above, means that the dma failed.  If it indeed failed, I fail to see why.  The field dstax=0x1000000 I think is trying to tell me why it fails, but I do not know how to interpret it.  I set up the dma for a large data transfer (0x54000) but I also tried smaller byte count, 1024, which also fails.  The reason I think that the dma fails is that the local memory buffer holds zero values after the call to sysTempeDmaStart, while I see non zero values in the VME module buffer.

I wonder if some of you folks with much experience in these matters could provide me with a simple example how to setup the call to sysTempeDmaStart routine.
Thanks in advance,
Zen

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System