I need a DFF with asynchronous reset in my diagram. Does quartus have it? If not, how can I implement it?
Well, I am very new to quartus and that's why I didn't know it. But I post the answer for people similar to me:
Use LPM_DFF and the aclr port will be your active high asynchronous reset.
Related
Having trouble tying to find a solution for such a seemingly simple operation in SparkAR.
I basically want a pulse to happen, then wait xx seconds and pulse again and keep repeating.
I have looked everywhere and can't seem to find any solution. My first time posting here, so hoping someone might be able to shed some light!
Also, is there any way to "force" a filter to restart (as if just opened) after a given period?
Regards,
Andy
Let's say that I call MailboxProcessor.PostAndReply, which may run for a very long time due to whatever reasons. What would happen if I call MailboxProcessor.Post from some other thread while the first call has not returned yet?
What I mean is, yeah, sure, I can write a test that would recreate this situation. However, before I start reinventing the bicycle, I wonder if anyone already knows the answer on this question.
Thanks a lot!
The short answer: no, it doesn't block.
The longer version:
Mailbox processor uses a regular Queue<T> instead of a ConcurrentQueue<T> - which means posting uses a lock to enqueue, meaning that if a post were to be called from two different threads, one would block the thread till the other call returned - which would happen very fast, but block.
tl;dr: Post does not block is so far as no actual work is done on posting.
I have a BLE value set after which I need to wait for 6.25ms for other device to write into its buffer.
so I have been using usleep(6250)... As I got to know usleep considers value in micro seconds... So I am considering 6250 microseconds=6.25 ms. Is it the right api to use ? as there are different posts which say usleep should never be used in iOS etc. I am not able to make a difference in wait time by debugging it with breakpoint as I think the wait time is too less to be visible like I can with sleep(2)... Pls confirm if its right API to use and if I am passing right value to API. If not please suggest.
In general, you shouldn't sleep a thread ever. That blocks the thread and wastes system resources.
Instead, use dispatch_after() or a similar API.
As well, do you really need to wait at all? Or does the device send some kind of acknowledgement that the write was successful? I.e. is there some signal from the device that you can react to to know that the write happened?
I have a timer project requirement in my web server. Some effects done by clients operations at the server needs to be reset after sometime the had occurred. To do this, I intend to use erlang:start_timer/3 function to send a reset message to a process that does the resetting for each effects. This is ok with few client's operations coming in. The question is, does erlang timer scales very well as the number of current effects to time for reset increases?
Don't guess, don't ask, try it and measure. Nobody know your use case and requirements better than you. Is it for profit? Then you are paid for it. Is it as a hobby, then be used to it. It is an integral part of your job.
Here is a simple question.
suppose that I have a very long loop to execute, It would be nice to keep the user informed about the progressing right? I would print for example the number of loops that have been executed so far and how many are remaining.
The problem that I have is those output wouldn't be visualized until the the loop is finished, and thus there will be no point for them to be displayed.
I'm sure that there is some method in dart that can some sort of a handler to the browser to execute tasks and events whenever I want to and keep running the loop.
I'm new to dart, I hope that someone could answer this question.
Thank you.
PS: If you don't know how to, you can give me any ideas of keywords that I can use to look for this particular feature in dart documentation, it will be very helpful.
You can dig into Isolates, which allow background work on supported browsers.
https://api.dartlang.org/docs/channels/stable/latest/dart_isolate.html
Nothing as simple as DoEvents(), but all of the pieces are there.
I think too that Isolates are the best approach but wasn't successful using them on the browser a while ago, but there was a bigger refactoring going on lately in Isolates.
Does anyone know of a current client side Isolates example?
The API doc referenced by #kevmoo contains a link to an Isolates article that doesn't exist anymore (maybe must be rewritten due to the mentioned refactoring).
Another approach would be a method that returns after a chunk of work and gets recalled repeated in a loop until it returns for example true for done (false for not yet).
When you call this method using scheduleMicrotask(doChunk) or new Timer(() => doChunk()) other tasks get some air (import 'dart:async';) each time before the method gets actually called.