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visa.rb
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visa.rb
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module RbVisa
# module which binds visa dll functions to Ruby
# and provides a entry point from Ruby
module VISA
# loads visa dll
extend FFI::Library
ffi_lib 'C:\Windows\System32\visa32.dll' # TODO: set path from conf file
# imports template file with binding information and binds dll functions
require 'rb_visa/visa/template'
Template.each{ |sig| attach_function *sig }
# defines VISA constants
VI_NULL = 0
VI_FALSE = 0
VI_TRUE = 1
NULL = 0
# VISA constants for buffer settings
VI_READ_BUF = 1
VI_WRITE_BUF = 2
VI_READ_BUF_DISCARD = 4
VI_WRITE_BUF_DISCARD = 8
VI_ASRL_IN_BUF = 16 # VI_IO_IN_BUF
VI_ASRL_OUT_BUF = 32 # VI_IO_out_BUF
VI_ASRL_IN_BUF_DISCARD = 64 # VI_IO_IN_BUF_DISCARD
VI_ASRL_OUT_BUF_DISCARD = 128 # VI_IO_OUT_BUF_DISCARD
# human readable names
Buffer = {
read: VI_READ_BUF,
write: VI_WRITE_BUF,
asrl_in: VI_ASRL_IN_BUF,
asrl_out: VI_ASRL_OUT_BUF,
}
# other VISA attributes
VI_ATTR_TMO_VALUE = 0x3fff001a
VI_TMO_INFINITE = 0xFFFFFFFF
end
end