[issue24859] ctypes.Structure bit order is reversed - counts from right

zeero added the comment: Thanks for the advise. I'll give it a try. So ctypes.Structure is always little endian regardless from the underlying architecture. I just checked on a raspberry pi 2 that should be a big endian device, and got the same results as before. I'm still not su

[issue24859] ctypes.Structure bit order is reversed - counts from right

zeero added the comment: Sorry for the inconvenience. The format specification can be found in chapter 2.1 in http://vector.com/portal/medien/cmc/application_notes/AN-ION-1-3100_Introduction_to_J1939.pdf So I would write down the field contents in that order _fields_ = [('res

[issue24859] ctypes.Structure bit order is reversed - counts from right

New submission from zeero: I'm implementing a CAN SAEJ1939 stack in Python and convert CAN message ids in between integers and structures, tunneling them through a Union object with 4 bytes like what i would do in C. I was checking that particular function and the 3 priority bits were a