From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM autolearn=unavailable autolearn_force=no version=3.4.4 X-Received: by 10.43.135.4 with SMTP id ie4mr5376602icc.1.1392480405271; Sat, 15 Feb 2014 08:06:45 -0800 (PST) X-Received: by 10.140.20.167 with SMTP id 36mr117967qgj.13.1392480405240; Sat, 15 Feb 2014 08:06:45 -0800 (PST) Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!news.eternal-september.org!feeder.eternal-september.org!news.glorb.com!c10no23628868igq.0!news-out.google.com!s3ni20101qas.0!nntp.google.com!f11no21036331qae.1!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail Newsgroups: comp.lang.ada Date: Sat, 15 Feb 2014 08:06:45 -0800 (PST) In-Reply-To: Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=201.95.3.197; posting-account=TRgI1QoAAABSsYi-ox3Pi6N-JEKKU0cu NNTP-Posting-Host: 201.95.3.197 References: <215f6df2-a7ec-42f4-ac82-656d5b12bf61@googlegroups.com> User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: <8383f5d6-3f66-415b-ab3f-8801fa377a6b@googlegroups.com> Subject: Re: Best representation for spares From: "Rego, P." Injection-Date: Sat, 15 Feb 2014 16:06:45 +0000 Content-Type: text/plain; charset=ISO-8859-1 Xref: news.eternal-september.org comp.lang.ada:18576 Date: 2014-02-15T08:06:45-08:00 List-Id: On Friday, February 14, 2014 7:19:20 AM UTC-2, Simon Wright wrote: > I'd much prefer to fill this space. And, on the whole, better with zeros > (unless, of course, 'unused' means 'don't even write to this bit'). > Something like > type Zero_Bit is range 0 .. 0; > type Zero_Bits is array (Positive range <>) of Zero_Bit; > for Zero_Bits'Component_Size use 1; > type Auxiliary_Interrupt_Status_Type is > record > Mini_Uart_IRQ : Boolean; > SPI_1_IRQ : Boolean; > SPI_2_IRQ : Boolean; > Spare : Zero_Bits (3 .. 31); > end record; > pragma Pack (Auxiliary_Interrupt_Status_Type); > for Auxiliary_Interrupt_Status_Type'Size use 32; Great, I will use this. Even more that the datasheet says 'Reserved, write zero, read as don't care'. Thanks.