dma sample

[chucky]

i am porting a driver written in c that was for the VxWorks operating system. it is a pmc card that can do DMA. the target is to put it on a carrier for a PXI chassis and to use LabVIEW RT. there is a function in VxWorks called cacheDmaMalloc(). i was wondering if there is an equivalent in the VISA library API. also, can i just use malloc(). are there any samples that i could look at. thanks.

[Snowman 6008]

Chucky,

You can use malloc in a real-time environment. The examples for CVI Real-Time which uses the same OS as LabVIEW Real-time can be found here: C:\Documents and Settings\All Users\Documents\National Instruments\CVI90\samples\realtime. The full VISA library can be used while on Real-Time, more information about all of the VISA functions can be found in the CVI help. I took a look at the documentation for cacheDmaMalloc() and it looks like it may be doing more than just simply allocating memory.