- From: bryan cole <bryan.cole_at_teraview.co.uk>
- Date: 05 Aug 2002 17:35:33 +0100
Hi, I'm trying to get memory-mapped streaming AI-acquisition working on my NI PCI-MIO-16e board. I'm using the ni_pcimio.o driver on a RH7.2 linux box. The "cmd" example program, demonstrating asynchronous acquisition using the read() function works fine. However the "mmap" example doesn't. As far as I can see the function comedi_get_buffer_offset() always returns 0 - hence the loop hangs. However, if I insert an extra read() function into the loop (e.g. read(comedi_fileno(dev),DummyBuffer,512)), the program seems to work and comedi_get_buffer_offset() returns the correct buffer offset. Can anyone suggest how to get comedi_get_buffer_offset() working without the read() call? I've tried disabling DMA in ni_pcimio.c with no change. I've also tried inserting comedi_poll() calls with no effect. any suggestions would be much appreciated. cheers, Bryan
Received on 2002-08-05Z15:35:33