Michael R. Steed - Round Rock TX David W. Madden - Austin TX
Assignee:
National Instruments Corporation - Austin TX
International Classification:
G06F 1314
US Classification:
710 22, 710 15, 710 23, 710308, 709301, 702127
Abstract:
A USB-based data acquisition system including virtual DMA software which increases USB data transfer rates with minimal changes to DAQ driver level software. The virtual DMA software operates to receive or intercept DMA instructions provided by the DAQ driver level software to program a DMA controller to acquire data from the device. The virtual DMA software intercepts the DMA instructions and emulates operation of the DMA controller in software. The virtual DMA software operates to request the data in bulk packets from the device. The virtual DMA software then stores the received packets of data in the addresses specified in the DMA instructions. The virtual DMA software thus emulates operation of a DMA device, thus âfoolingâ the DAQ driver level software into thinking the data is being acquired using real DMA transfers. Thus, the present invention allows for much faster data transfers, while requiring minimal or no changes to the existing DAQ driver level software.
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