Experimental Physics and
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We are in the process of creating an EPICS interface to our oscilloscope. It is a PCI device with its own kernel driver and user space driver with the host processor that will be running our EPICS IOC. It seems that though EPICS supports a list of communication interfaces (GPIB, VME, VXI, serial, etc.), it does not allow for a device to be connected above this layer through an ANSI-C API easily. Though asyn device support is a complete solution down to the kernel level, we want to be able to leverage our existing drivers. For packaging up this functionality, we want to create records that map directly to our API calls, which are functions with variable arguments, some that may be passed by reference for modification. We have function tables containing our calls with variable argument types, but we are not seeing a common way to link PVs to function calls with arguments. In the dbd, we are doing something like: device(ao, INST_IO, devScopeao, "scopeAPI"). Can I use the INP and OUT fields arbitrarily, parsing a common syntax (i.e. a single string value such as "@function arg1 arg2") in the device support layer, to make function wrappers? Is there a general way that we can hook into something that already accomplishes this? Does this break the ability to link PVs properly? Can I do this using the standard record types? Am I missing something else? Thanks in advance! -glr -- Gabriel L. Rael Jr. Software Engineer ZTEC Instruments http://www.ztecinstruments.com
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ANJ, 10 Nov 2011 |
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