Experimental Physics and
Industrial Control System

Hi Martin,

I did some tests and indeed I get:
                            32 bit IOC          64 bit IOC
big endian signed:          2283351134     18446744071697936384
little endian signed:       2283351134     18446744071697936384
big endian unsigned:       -2011616162               2283351134
little endian unsigned:    -2011616162              -2011616162

This seems all quite wrong. I will have a look.
Dirk

On 02.08.2018 21:57, Martin L. Smith wrote:

Hi,

I'm being sent a ULONG such as 2283351134 (base 10) and asyn shows
me in hex the number coming across as 5e 2c 19 88 and it should be
88 19 2c 5e so the order is reversed when the number is sent to the
IOC.

When I use the format converter %04r
     I get the number 1579948424 (base 10) which is 5e 2c 19 88

When I use the format converter %#4r
     I get the number -2011616162 which I think would be the correct
     number if it was unsigned.

What I really want to do is something like a format converter %#04r
but combining the # and the 0 flags doesn't seem to do what I want.
I need the value to be unsigned AND 32 bits byte order swapped.

Has anyone else run across this issue and if so how did you make it
work?

We are going to try sending a char array instead and see if that helps.

Thanks,
Marty

Replies:

Re: streamDevice 32-Bit ULONG endianess Dirk Zimoch

References:

streamDevice 32-Bit ULONG endianess Martin L. Smith

Navigate by Date:

Prev: Re: Re: Delta Tau motor control problem Mark Rivers

Next: Re: Delta Tau motor control problem Torsten Bögershausen

Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  <2018>  2019  2020  2021  2022  2023  2024 

Navigate by Thread:

Prev: Re: streamDevice 32-Bit ULONG endianess Dirk Zimoch

Next: Re: streamDevice 32-Bit ULONG endianess Dirk Zimoch

Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  2016  2017  <2018>  2019  2020  2021  2022  2023  2024