Force little-endian format when writing eeg datafile

CITATION.cff

@@ -23,6 +23,9 @@ authors:
 - given-names: "Phillip"
   family-names: "Alday"
   orcid: https://orcid.org/0000-0002-9984-5745
+- given-names: "Aniket"
+  family-names: "Pradhan"
+  orcid: https://orcid.org/0000-0002-6705-5116
 title: "pybv"
 version: 0.5.0
 date-released: 2021-01-03

docs/changelog.rst

@@ -7,6 +7,7 @@ Authors
 People who contributed to this software across releases (in **alphabetical order**):
 
 - `Adam Li`_
+- `Aniket Pradhan`_
 - `Chris Holdgraf`_
 - `Clemens Brunner`_
 - `Phillip Alday`_
@@ -33,6 +34,7 @@ Changelog
 ~~~~~~~~~
 
 - :func:`pybv.write_brainvision` gained a new parameter, ``ref_ch_names``, to specify the reference channels used during recording, by `Richard Höchenberger`_ and `Stefan Appelhoff`_ (:gh:`75`)
+- Fix bug where :func:`pybv.write_brainvision` would write the binary eeg file in big-endian on a big-endian system. This could lead to non-uniformity of data-files written by big-endian or little-endian machines, by `Aniket Pradhan`, `Clemens Brunner` and `Stefan Appelhoff`_ (:gh:`80`).
 
 API
 ~~~

pybv/io.py

@@ -494,8 +494,8 @@ def _write_bveeg_file(eeg_fname, data, orientation, format, resolution, units):
 
     # Swap bytes if system architecure is big-endian and dtype is "native" or
     # "big-endian"
-    byteorder = data.dtype.byteorder
-    if (sys.byteorder == "big" and byteorder == "=") or byteorder == ">":
+    byteorder = data.dtype.byteorder  # pragma: no cover
+    if (sys.byteorder == "big" and byteorder == "=") or byteorder == ">":  # pragma: no cover  # noqa: E501
         data = data.byteswap()
 
     # Save to binary