From: Vasiliy Ivanov <beelzebubbie.logs@gmail.com>
To: meino.cramer@gmx.de
Cc: zsh-users@zsh.org
Subject: Re: Doing NMEA command sequences with zsh ... ??!!
Date: Mon, 13 Oct 2014 23:27:52 +0600 [thread overview]
Message-ID: <543C0B98.2080504@gmail.com> (raw)
In-Reply-To: <20141013155806.GA3825@solfire>
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On 13.10.2014 21:58, meino.cramer@gmx.de wrote:
> Hi,
>
> To my embedded system (which runs zsh on Gentoo Linux ;) ) I have atteched an GPS receiver
> chip. This chip spits out NMEA sentences to an UART and is capable of receiving NMEA command
> seqyences.
>
> An NMEA command sequence consist of $<commandname><parameter,nextparameter,....><*><checksum>
>
> The checksum is the binary XOR of all characters between '$' and '*'. This checksum is given a
> an hexadecimal number.
>
> Since it is an embedded system, I would prefer to calculate this checksum with zsh only since
> it already runs if I am logged in.
>
> Is that possible in any way?
>
> Thank you very much in advance for any help! Best regards, mcc
Not digging deep into NMEA stuff, only some related hints:
% integer a b; a=16#e7; b=16#3c; print $(([#16]a^b));
16#DB
% c='abcABC'; for i in ${(s..)c}; do print $((#i)); done
97
98
99
65
66
67
- --
Regards,
Vasiliy Ivanov <beelzebubbie.logs@gmail.com>
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next prev parent reply other threads:[~2014-10-13 17:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-13 15:58 meino.cramer
2014-10-13 17:27 ` Vasiliy Ivanov [this message]
2014-10-14 3:02 ` Bart Schaefer
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