Re: Re:Positional/physical addressing

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Sujet : Re: Re:Positional/physical addressing
De : jeroen (at) *nospam* nospam.please (Jeroen Belleman)
Groupes : sci.electronics.design
Date : 24. Jun 2025, 19:18:36
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <103eq5s$25qkr$1@dont-email.me>
References : 1 2 3 4
User-Agent : Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0
On 6/24/25 19:05, Don Y wrote:
On 6/24/2025 9:49 AM, Don Y wrote:
On 6/24/2025 9:18 AM, Martin Rid wrote:
CAN network?
>
Each CAN node either needs a unique address to which messages can be
directed;  *or*, to KNOW to listen for particular BROADCAST messages.
>
So, you either send a message to node 5 to do something
OR, you send a message about that something and expect
that node to know that *it* should process that message.
>
If all of the nodes are *identical* (hardware and software),
there is nothing to distinguish one device from any other.
 By way of example, in the 70's, we would do "poor man's networking"
by daisy-chaining IDENTICAL devices with serial ports:
 HOST---->[]----->[]---->[]----->[]
 (each set of brackets represents a device with its serial input
on the left side and output on the right)
 If I pass a message (from the host) of the form "1xxxxxx", the
first device receives the message, notices that it begins with
a '1' and assumes it is meant for it; the message is absorbed
by that device.
WS2812 LED chips do something like that. The first chip in the chain
absorbs the first three bytes and passes on all that come after, and
so on down the chain. Wait 50 us and the first chip in the chain is
ready again to intercept its three bytes.
It's common for driving LED strips.
Jeroen Belleman

Date Sujet#  Auteur
24 Jun 25 * Positional/physical addressing25Don Y
24 Jun 25 +* Re: Positional/physical addressing8Martin Rid
24 Jun 25 i`* Re: Positional/physical addressing7Don Y
24 Jun 25 i `* Re: Positional/physical addressing6Don Y
24 Jun 25 i  +* Re: Positional/physical addressing4Jeroen Belleman
25 Jun18:30 i  i`* Re: Positional/physical addressing3Ian
25 Jun18:43 i  i +- Re: Positional/physical addressing1Don Y
25 Jun22:29 i  i `- Re: Positional/physical addressing1Jeroen Belleman
24 Jun 25 i  `- Re: Positional/physical addressing1Don Y
25 Jun09:52 +* Re: Positional/physical addressing11Liz Tuddenham
25 Jun10:14 i`* Re: Positional/physical addressing10Don Y
25 Jun11:14 i `* Re: Positional/physical addressing9Liz Tuddenham
25 Jun18:04 i  `* Re: Positional/physical addressing8Don Y
26 Jun09:59 i   +* Re: Positional/physical addressing4Liz Tuddenham
26 Jun10:46 i   i`* Re: Positional/physical addressing3Don Y
26 Jun17:53 i   i `* Re: Positional/physical addressing2Liz Tuddenham
26 Jun21:48 i   i  `- Re: Positional/physical addressing1Don Y
26 Jun20:58 i   +* Re: Positional/physical addressing2bitrex
26 Jun21:50 i   i`- Re: Positional/physical addressing1Don Y
26 Jun21:00 i   `- Re: Positional/physical addressing1bitrex
25 Jun18:40 +* Re: Positional/physical addressing4Ian
25 Jun20:41 i`* Re: Positional/physical addressing3Don Y
25 Jun21:35 i `* Re: Positional/physical addressing2Dennis
25 Jun22:53 i  `- Re: Positional/physical addressing1Don Y
25 Jun19:25 `- Re: Positional/physical addressing1john larkin

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