Anonymous
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Feb 04, 2011
12:02 AM
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Feb 04, 2011
12:02 AM
Hi,
I have developed a device to read data from our radar DAQ chassis but I am having some latency problems. I was using bulk transfers (EP2 quad buffered 512 bytes) and I am now trying to use iso transfers instead (EP2 double buffered 1024 bytes).
I use the GPIF to read from the 96kbyte FIFO in the DAQ, and this worked fine when I was using a bulk EP, however now that I have switched to iso it doesn't do anything. My code triggers a GPIF FIFO read but nothing happens apart from the GPIF saying it's busy.
The GPIF FIFO read is just.
// GPIF Waveform 2: FIFO Rea // // Interval 0 1 2 3 4 5 6 Idle (7) // _________ _________ _________ _________ _________ _________ _________ _________ // // AddrMode Same Val Same Val Same Val Same Val Same Val Same Val Same Val // DataMode NO Data Activate Activate Activate Activate Activate Activate // NextData SameData SameData SameData SameData SameData SameData SameData // Int Trig No Int No Int No Int No Int No Int No Int No Int // IF/Wait Wait 3 IF Wait 1 Wait 1 Wait 1 Wait 1 Wait 1 // Term A QTR // LFunc OR // Term B IntReady // Branch1 ThenIdle // Branch0 ElseIdle // Re-Exec No // Sngl/CRC Default Default Default Default Default Default Default // REQ 0 1 1 1 1 1 1 1 // CTL1 0 0 0 0 0 0 0 0 // CTL2 0 0 0 0 0 0 0 0 // CTL3 0 0 0 0 0 0 0 0 // CTL4 0 0 0 0 0 0 0 0 // CTL5 0 0 0 0 0 0 0 0 So there's no decision state to stall on or anything. Anyone have any clues?
1 Reply
Anonymous
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Feb 04, 2011
01:04 AM
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Feb 04, 2011
01:04 AM
Replugging the device made it work.. So I guess I'm not resetting it properly and had caused a problem with earlier messing around.