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<== Date ==> <== Thread ==>

Subject: mbbo/mbbi and bits subset
From: "[email protected]" <[email protected]>
To: [email protected]
Date: Thu, 10 Mar 2016 11:54:05 +0100 (CET)

Hi,
I'm using mbbo and mbbi record types to write and read
some registers from/to ASYN driver I'm developing;

some registers refers to a single aspect of acquisition
(e.g. channel threshold) and with a simple mbbo record
to write and a mbbi record to read back, everything works
fine...

other registers refers to a setup/control functions
and using the same mbbo/mbbi approach works fine if
the user address (read/write) every time the whole register;

I know mbboDirect for bitwise access of a record value but
is there a method to address (read/write) through a record
a "bits subset" of a "main" mbbo record ?

e.g. acquisition control:

        bit[16...2]	<don't care>

	bit[1...0]
	  11		stop acquisition
	  10		start acquisition
	  01		do something...
	  00 		do something...

which is a simple method to access "directly" bitset [0...1]
in order to have a record I can use to write 11 (3) to stop acquisition,
10 (2) to start acquisiton and so on ?

Thanks in advance,
Gennaro

--
Gennaro Tortone
INFN Napoli
Italy
tel: +39 81 676169

"Computer Science is no more about computers
    than astronomy is about telescopes."
    - Edsger Dijkstra

Replies:
RE: mbbo/mbbi and bits subset Mark Rivers
RE: mbbo/mbbi and bits subset peter.owens

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