Re: [serial com (rs232)] 9 bits needed

From	jeffj@panix.com (Jeff Jonas)
Newsgroups	comp.sys.raspberry-pi
Subject	Re: [serial com (rs232)] 9 bits needed
Date	2015-10-11 00:28 -0400
Organization	Jeff's House of Electronic Parts
Message-ID	<mvcoi3$mgj$1@panix5.panix.com> (permalink)
References	<mug5tm$r8s$1@speranza.aioe.org>

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In article <mug5tm$r8s$1@speranza.aioe.org>, andre  <ahr@blabla.be> wrote:
>I am trying to build a rs485 network using microcontrolers
>Microcontrolers have the hability to recieve 9 bits data.
>They use this as an 'adress'. If the adresse matches the folowing data
>(8bits) are read (causing an interrupt) otherwize they are ignored until
>the next adress.

"9 bit" is a hardware feature of the UART.
Hardware support is best,
unless you "bit-bang" the serial bits totally in software.

>gcc can't be configurated for 9 bits (CS9 doesn't exist)

It's not a compiler issue.
Look at how the Microchip PIC or Atmel AVR do it:
it's via control registers and data that are all 8-bit-bytes.

>Is there another way to do it??

Software bit-banging.

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[serial com (rs232)] 9 bits needed andre <ahr@blabla.be> - 2015-09-30 10:19 +0200
  Re: [serial com (rs232)] 9 bits needed Dom <domafp@blueyonder.co.uk> - 2015-09-30 09:39 +0100
    Re: [serial com (rs232)] 9 bits needed Rob <nomail@example.com> - 2015-09-30 10:37 +0000
  Re: [serial com (rs232)] 9 bits needed colonel_hack@yahoo.com - 2015-09-30 13:25 -0700
  Re: [serial com (rs232)] 9 bits needed Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2015-10-01 10:31 +0300
  Re: [serial com (rs232)] 9 bits needed jeffj@panix.com (Jeff Jonas) - 2015-10-11 00:28 -0400

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