/python-advantech-DAQNavi-bdaqctrl

bdaqctrl driver for advantech boards for python

Primary LanguageC

python-advantech-DAQNavi-bdaqctrl

bdaqctrl driver for advantech boards for python. There is two versions of driver:

  • swig-based
  • CFFI-based

swig-based

Pros:

  • Python-native objects creation style
  • cpp driver model (e.g. obj.method())

Cons:

  • Compilation
  • Recompilation of driver for each major python version
  • Swig — third language

Some instructions and binaries in old directory.

CFFI

Pros:

  • No compilation

Cons:

  • c-style api
  • «Hard» object creation (via ffi.new("..."))

  1. Create _bdaqctlr.h from bdaqctrl.h. You don't need preprocessor to insert system headers, so comment # include <stdlib.h> string and run:

    c99 -D_BDAQ_C_INTERFACE -E bdaqctrl.h > _bdaqctrl.h

    to produce header without preprocessor directives.

  2. Use library as:

    from cffi import FFI


ffi = FFI()
with open("_bdaqctrl.h") as fin:

    ffi.cdef(fin.read())

bdaqctrl = ffi.dlopen("libbiodaq.so")
info = ffi.new("DeviceInformation *")

# don't forget to initialize whole structure
info.Description = "PCI-1756, BID#0"
info.DeviceNumber = -1
info.DeviceMode = bdaqctrl.ModeWriteWithReset
info.ModuleIndex = 0

di = bdaqctrl.AdxInstantDiCtrlCreate()
do = bdaqctrl.AdxInstantDoCtrlCreate()

assert bdaqctrl.Success == bdaqctrl.InstantDiCtrl_setSelectedDevice(di, info)
assert bdaqctrl.Success == bdaqctrl.InstantDoCtrl_setSelectedDevice(do, info)
print(bdaqctrl.InstantDiCtrl_getPortCount(di))
print(bdaqctrl.InstantDoCtrl_getPortCount(do))