wakeup | Simple alarm clock program ; also a demonstration
kandi X-RAY | wakeup Summary
kandi X-RAY | wakeup Summary
This is just a simple alarm clock program in Go; it demonstrates The source should be self-explanatory; feel free to make suggestions.
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Top functions reviewed by kandi - BETA
- NewMainWindow returns a new MainWindow .
- stop stops the running process
- bestTime returns the most recent time from now .
- main window
wakeup Key Features
wakeup Examples and Code Snippets
Community Discussions
Trending Discussions on wakeup
QUESTION
I set the alarmMgr like this:
...ANSWER
Answered 2022-Apr-15 at 10:33- As of API 19, all repeating alarms are inexact. If your application needs precise delivery times then it must use one-time exact alarms, rescheduling each time as described above. Legacy applications whose targetSdkVersion is earlier than API 19 will continue to have all of their alarms, including repeating alarms, treated as exact.
- So if you would like to achieve exact repeating alarm use AlarmManager.setExact() and rescheduling
- Refer google
QUESTION
I was migrating my bot from discord.py to nextcord and I changed my help command to a slash command, but it kept showing me this error:
nextcord.errors.HTTPException: 400 Bad Request (error code: 50035): Invalid Form Body
It said that the error was caused by exceeding 2000 characters in the web.
Full Error: ...ANSWER
Answered 2022-Mar-08 at 16:33From the discord dev docs:
CHAT_INPUT command names and command option names must match the following regex
^[\w-]{1,32}$
The regex essentially translates to:
If there is a lowercase variant of any letters used, you must use those
In this case, your option name, 'Command' has an uppercase 'C', which is disallowed.
Note: The length of the name must also be lower or equal to 32.
ReferenceQUESTION
I have the LIS3DH accelerometer connected with i2c and when I run the script, which is supposed to print out the x, y, z values I am getting random numbers.
I'm in C++ using the i2c and smbus libraries, which are part of the Linux Kernel.
This is the (datasheet)[https://cdn-shop.adafruit.com/datasheets/LIS3DH.pdf] for the accelerometer.
I have tried changing the addresses of registers.
I tried __s16 instead of __s32.
I'm not sure if I'm missing something that should happen before readings are taken. I don't know if other registers need to be written to. I'm a little in the dark about what exactly is going on in the function in the bottom with the bits and values returned from the registers. I would like to learn.
ANSWER
Answered 2022-Feb-04 at 22:52I was using initialize_mpu with the wrong register addresses.
There are a few configuration options buried somewhere in this datasheet. I applied one and now I get muh readings.
QUESTION
I am trying to
- get the average wakeup time from a list of wake up times in a df column and
- compare them to a goal wake up time (earlier or later)
ANSWER
Answered 2022-Jan-08 at 21:14As MrFuppes suggested, probably the easiest way would be converting to datetime.timedeltas, instead of datetime.times:
QUESTION
The information I've found on cppreference is vague in this regard, so I'm asking here. Say I have two threads waiting on a condition with one having a true predicate, and the other a false one (e.g. condition.wait(lock, [=]{ return some_condition; }). The main thread decides to randomly notify one of them with cond.notify_one().
Assume that the waiting thread selected is the one where the predicate is false. Is the thread going to implicitly notify the next one (if there are any left), or will it be doomed to wait until spurious wakeup?
In case only a single thread is woken up no matter whether its condition succeeds or fails, what would a good way for the first thread to try waking the next one up for a guaranteed successful notify? A naive fix:
...ANSWER
Answered 2021-Dec-22 at 01:23A notify_all() won't work, because we may accidentally end waking up multiple threads that satisfy the condition, meanwhile we only want a single one to go through at most.
That is not entirely accurate. Only one thread can lock a given mutex at a time, no matter what. If all execution threads who are waiting on the condition variable locked the same mutex (as they should) before they started to wait on the condition variable, then only one of those execution threads will successfully re-lock the mutex and "wake up", and return from wait(). When it unlocks the mutex the next scheduled execution thread will be able to re-lock it and return from its wait(). And so on. notify_all() does not result in all execution threads galloping forward, full speed ahead. Effectively only one thread gets woken up, at a time, because they all must re-lock the same mutex. This single-threads them.
All execution threads get scheduled to be woken up by notify_all, and they will all get woken up. However, effectively, only one execution thread will end up woken first, and lock the mutex. When it unlocks the mutex the next execution thread, that got scheduled to be woken up by notify_all(), will be able to re-lock it, and so on.
Next, let's look at what wait() with a predicate is logically equivalent to:
QUESTION
For my application (running on an STM32L082) I need accurate (relative) timestamping of a few types of interrupts. I do this by running a timer at 1 MHz and taking its count as soon as the ISR is run. They are all given the highest priority so they pre-empt less important interrupts. The problem I'm facing is that they may still be delayed by other interrupts at the same priority and by code that disables interrupts, and there seems to be no easy way to know this happened. It is no problem that the ISR was delayed, as long as I know that the particular timestamp is not accurate because of this.
My current approach is to let each ISR and each block of code with interrupts disabled check whether interrupts are pending using NVIC->ISPR[0] and flagging this for the pending ISR. Each ISR checks this flag and, if needed, flags the timestamp taken as not accurate.
Although this works, it feels like it's the wrong way around. So my question is: is there another way to know whether an IRQ was served immediately?
The IRQs in question are EXTI4-15 for a GPIO pin change and RTC for the wakeup timer. Unfortunately I'm not in the position to change the PCB layout and use TIM input capture on the input pin, nor to change the MCU used.
update
The fundamental limit to accuracy in the current setup is determined by the nature of the internal RTC calibration, which periodically adds/removes 32kHz ticks, leading to ~31 µs jitter. My goal is to eliminate (or at least detect) additional timestamping inaccuracies where possible. Having interrupts blocked incidentally for, say, 50+ µs is hard to avoid and influences measurements, hence the need to at least know when this occurs.
update 2
To clarify, I think this is a software question, asking if a particular feature exists and if so, how to use it. The answer I am looking for is one of: "yes it is possible, just check bit X of register Y", or "no it is not possible, but MCU ... does have such a feature, called ..." or "no, such a feature is generally not available on any platform (but the common workaround is ...)". This information will guide me (and future readers) towards a solution in software, and/or requirements for better hardware design.
...ANSWER
Answered 2021-Nov-25 at 18:18The ideal solution for accurate timestamping is to use timer capture hardware (built-in to the microcontroller, or an external implementation). Aside from that, using a CPU with enough priority levels to make your ISR always the highest priority could work, or you might be able to hack something together by making the DMA engine sample the GPIO pins (specifics below).
Some microcontrollers have connections between built-in peripherals that allow one peripheral to trigger another (like a GPIO pin triggering timer capture even though it isn't a dedicated timer capture input pin). Manufacturers have different names for this type of interconnection, but a general overview can be found on Wikipedia, along with a list of the various names. Exact capabilities vary by manufacturer.
I've never come across a feature in a microcontroller for indicating if an ISR was delayed by a higher priority ISR. I don't think it would be a commonly-used feature, because your ISR can be interrupted by a higher priority ISR at any moment, even after you check the hypothetical was_delayed flag. A higher priority ISR can often check if a lower priority interrupt is pending though.
A possible approach is to use a timer and DMA (similar to audio streaming, double-buffered/circular modes are preferred) to continuously sample your GPIO pins to a buffer, and then you scan the buffer to determine when the pins changed. Note that this means the CPU must scan the buffer before it is overwritten again by DMA, which means the CPU can only sleep in short intervals and must keep the timer and DMA clocks running. ST's AN4666 is a relevant document, and has example code here (account required to download example code). They're using a different microcontroller, but they claim the approach can be adapted to others in their lineup.
Otherwise, with your current setup, I don't think there is a better solution than the one you're using (the flag that's set when you detect a delay). The ARM Cortex-M0+ NVIC does not have a feature to indicate if an ISR was delayed.
A refinement to your current approach might be making the ISRs as short as possible, so they only do the timestamp collection and then put any other work into a queue for processing by the main application at a lower priority (only applicable if the work is more complex than the enqueue operation, and if the work isn't time-sensitive). Eliminating or making the interrupts-disabled regions short should also help.
QUESTION
I am new to Xcode and ObjectiveC and I am building a non-UI tool. I found my main thread will get hang forever and never wakeup when I am using semaphore in main thread
...ANSWER
Answered 2021-Nov-25 at 09:34No async tasks will be processed on the main queue while it is blocking inside dispatch_wait(). This includes the task that you queued.
dispatch_wait() from the main queue only makes sense if the semaphore condition will be met without the main queue running any code.
QUESTION
According to the docs, sending sendMessage from the WatchKit app will wake the iPhone app if it is inactive.
I would like to know the differences between such a wakeup app startup and a normal one. Surely a background process has a lot of differences to a normal foreground app. However, I could not find a thorough documentation on the subject.
Here's what I found so far:
- Since such a "wakeup" is not a normal app startup, I expect
didFinishLaunchingWithOptionsto receive a speciallaunchOptionskey. After all, the user did not start the app on the home screen, so there should be an indication inlaunchOptions. But when I tried it out,launchOptionswasnil. Doesn't that contradict the docs? - I also thought there should be differences because there is no UI present in a background process. So perhaps
[UIScreen mainScreen]might benil. But there seems to be no difference inmainScreenin the background process. In myAppDelegate.m, the code that creates the main window seems to run exactly the same way as in the foreground process. - I also expect that there are limits to the background process. Since the user did not actively start the process, I'm pretty sure that it cannot run for an infinite amount of time. Maybe there are also stricter memory limits.
- Is there a way I can debug such a background process in XCode? Can I tell XCode "wait until the app runs on the iPhone", such that the debugger gets attached as soon as the app runs?
- I also tried this in a React Native app. The Objective-C code in
AppDelegate.mseemed to run exactly the same way, regardless of background or foreground process. However, the whole Javascript part of the app did not run (which is kind of expected, because in a background process, we do not need any React UI). But there must be a difference in the process that causes the Javascript part to not run.
Please don't consider this question to be about "more than one question". The question of this post is quite clear: I want to know all the differences between a didReceiveMessage background process and a normal one. In the enumeration above, I just listed all the differences I would expect or that I have encountered so far, and the lack of documentation on those topics.
ANSWER
Answered 2021-Nov-17 at 18:02I think the background mode is just a UIKit concept. The app is started (thanks to the UIApplicationMain function) as a regular one but your app UI is not rendered.
It is just a warning: this is a transition state, your app can be suspended at any moment, be concise. The documentation is clear.
Regular UIKit APIs are available (if it was not the case, imagine all the potential crashs). But you won't receive any external events like touches.
Some external tasks like asking permissions, launching audio sessions etc would probably not be available too.
You can wait for the app to be launched by using the wait for the executable to be launched option in the scheme panel.
QUESTION
I declare an Object called gameRooms, which contains Objects representing the rooms and their properties. Then I declare gameState and include a property for 'currentRoom.' When the game starts and I set the 'currentRoom' variable to 'Graveyard' via the ChangeRoom() method, it works just fine.
However, when I click a button that executes the function declared in a room's func property, then function writes:
"You Enter The Main Hall.
You Enter The Graveyard."
...to the window. When I check the console, I'm still in the Graveyard. Why?
JSfiddle here: https://jsfiddle.net/SirenKing/fz8pg05L/2/
...ANSWER
Answered 2021-Nov-23 at 23:39There are a few problems with your code; Say() does nothing with its second parameter, and should either do so, or concatenate the parameters sent to it: function Say(one, two) { return one + two; } or Say(one + two);... But mainly, the largest problem is that you append your buttons to the label element.
If this element were anything but a label, your code would work without issue. This is because the label element propagates click or touch events to the element(s) within it, so every time you click either of the buttons in that label element, the element clicks both buttons at once.
Thus, the simple fix is to remove the code that appends the buttons to the label:
QUESTION
I can't step into function calls or into the for loop in Rstudio.
...ANSWER
Answered 2021-Nov-22 at 17:54Without access to your normdata object we can't investigate your exact problem. Two general suggestions:
- Before running your code, run this at the console:
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