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Search: Posts Made By: Curious.George
Forum: General Electronics Technical Discussion 10-25-2020, 03:51 PM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

You don't need interrupts. In my example, you LIKELY would have them to provide the timing information. But, you could also implement delays using a real timer.

The point is that you can write...
Forum: General Electronics Technical Discussion 10-25-2020, 12:04 PM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

That's not the case with preemptive multitasking. And, many nonpreemptive systems can run "endless loops" as long as there is some transfer of control to the OS within that loop (i.e., any system...
Forum: General Electronics Technical Discussion 10-21-2020, 11:28 PM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

IIRC, the network drop comes in over fiber -- any sourced power would have to be available locally (in which case, why not let the MCU use it directly?)



That's been the case for many years,...
Forum: General Electronics Technical Discussion 10-19-2020, 04:51 AM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

That's how a client-server system operates. The server exports a service. Clients make demands on that service.

DNS is a service. A client sends a request to the DNS server: "Give me the IP...
Forum: General Electronics Technical Discussion 10-17-2020, 07:28 PM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

My point has to do with whether the end of the fiber is "the other end of the link" (dedicated between "switches" and "pump") or, just a "network drop"?

In the former case, you "own the wire" and...
Forum: General Electronics Technical Discussion 10-16-2020, 05:48 PM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

Presumably, the fiber is terminated into something "electronic" that presents a standard ethernet interface? Or, do you have to design hardware to support the optical transducers (presumably via...
Forum: General Electronics Technical Discussion 10-16-2020, 01:31 PM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

(sigh)

Sorry, I've lost track of what the desired goal of all of this is (and I'm not keen on reading 80 posts to sort it out!).

Think about what you are trying to do "in the abstract".
...
Forum: General Electronics Technical Discussion 10-16-2020, 02:36 AM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

I have no idea what their library supports. My (uninformed) opinion of these devices is that they aren't really intended for "serious" work.



"Eclipse" is pretty much the de facto IDE for most...
Forum: General Electronics Technical Discussion 10-15-2020, 05:26 PM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

A "server" is typically a single device. It can handle multiple clients, concurrently, using a number of different implementation mechanisms.

You would, thus, have a single node that exports a...
Forum: General Electronics Technical Discussion 10-15-2020, 12:37 PM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

You have to choose how your system configuration is managed.

Do you "tell" someone that there are N clients and they exist at the following IP addresses?

Is each client told of the identity of...
Forum: General Electronics Technical Discussion 10-15-2020, 12:32 PM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

You don't understand how protocol stacks work.

A TCP connection is defined by a 5-tuple:
(protocol, source IP, source port, target IP, target port)

A server can manage any number (depends on...
Forum: General Electronics Technical Discussion 10-11-2020, 09:30 AM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

"Language support" is like advertising you have shiny hubcaps on your old klunker. The most powerful/effective programming tool is the environment supported by the "OS" (or, "RTOS" -- to use a often...
Forum: General Electronics Technical Discussion 10-08-2020, 01:12 AM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

I suspect the environment you're coding in is sorely crippled (single-threaded, etc.).

If you can afford to spin in a routine that just watches a button press, then the easiest way to do this is...
Forum: General Electronics Technical Discussion 09-11-2020, 07:39 PM
Replies: 178
Views: 4,387
Posted By Curious.George
Re: Remote pump control ideas.

Ethernet is a particular hardware communication scheme.

*An* "Internet" is an interconnected group (typically of) computers.

THE Internet is the global network of interconnected computers.
...
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