why does the hardware simulator respond this way error code: chip is not found in the working and built in folder while trying to load the chip. I get similar errors with Mux4way16 and Mux8way16. Does someone know where the problem might be? thanks!
CHIP Mux{
IN a, b, sel;
OUT out;
PARTS:
// output depending on sel=> and(sel,a)= sela, and(not(sel),b)= sel'b => or(and(sel,a), and(not(sel),b))= sela + (sel)'b
Not(in= sel,out= notsel);
Nand(a= notsel,b= a,out= out1);
Nand(a= sel,b= b,out= out2);
Nand(a= out1,b= out2,out= out);
}
Your code appears to run correctly on my computer. It is likely that for some reason, your And, Or or Not implementations are not being found by the hardware simulator (or do not compile properly).
You may also wish to recode your Mux implementation using only Not and Nand (or just Nand), it requires fewer gates.
Related
I downloaded Stdperiph library and i want to make USART example run on STM32F4 - Discovery. I chose STM32F40_41xxx workplace, added stm32f324x7i.c file and compiled without any errors.
Issue is that I cant receive expected message in my terminal (using Hercules), also when I check RxBuffer it is receiving some bytes but not that I sent.
I checked baudrate, wordlength, parity several times. Do you have any idea what could I do wrong?
USART conf:
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_2;
USART_InitStructure.USART_Parity = USART_Parity_Odd;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
STM_EVAL_COMInit(COM1, &USART_InitStructure);
Thank you.
First of all if you want to use hihg level abstraction libraries stop using obsolete SPL and start using HAL. Install the Cube. Generate the code - import into your favorite IDE and compile. Should work.
Your code does not show anything as USART clock may be net enabled as well as GPIOs. GPIOs may be configured wrong way. You system and peripheral clock may have wrong frequency. There are many more potential problems.
My goal is to convert a C++ program in to a .pexe file in order to execute it later on a remote computer. The .pexe file will contain some mathematical formulas or functions to be calculated on a remote computer, so I’ll be basically using the computational power of the remote computer. For all this I’ll be using the nacl_sdk with the Pepper library and I will be grateful if someone could clarify some things for me:
Is it possible to save the outputs of the executed .pexe file on the remote computer in to a file, if it’s possible then how? Which file formats are supported?
Is it possible to send the outputs of the executed .pexe file on the remote computer automatically to the host computer, if it’s possible then how?
Do I have to install anything for that to work on the remote computer?
Any suggestion will be appreciated.
From what I've tried it seems like you can't capture the stuff that your pexe writes to stdout - it just goes to the stdout of the browser (it took me hours to realize that it does go somewhere - I followed a bad tutorial that had me believe the pexes stdout was going to be posted to the javascript side and was wondering why it "did nothing").
I currently work on porting my stuff to .pexe also, and it turned out to be quite simple, but that has to do with the way I write my programs:
I write my (C++) programs such that all code-parts read inputs only from an std::istream object and write their outputs to some std::ostream object. Then I just pass std::cin and std::cout to the top-level call and can use the program interactively in the shell. But then I can easily swap out the top-level call to use an std::ifstream and std::ofstream to use the program for batch-processing (without pipes from cat and redirecting to files, which can be troublesome under some circumstances).
Since I write my programs like that, I can just implement the message handler like
class foo : public pp::Instance {
... ctor, dtor,...
virtual void HandleMessage(const pp::Var& msg) override {
std::stringstream i, o;
i << msg.AsString();
toplevelCall(i,o);
PostMessage(o.str());
}
};
so the data I get from the browser is put into a stringstream, which the rest of the code can use for inputs. It gets another stringstream where the rest of the code can write its outputs to. And then I just send that output back to the browser. (Downside is you have to wait for the program to finish before you get to see the result - you could derive a class from ostream and have the << operator post to the browser directly... nacl should come with a class that does that - I don't know if it actually does...)
On the html/js side, you can then have a textarea and a pre (which I like to call stdin and stdout ;-) ) and a button which posts the content of the textarea to the pexe - And have an eventhandler that writes the messages from the pexe to the pre like this
<embed id='pnacl' type='application/x-pnacl' src='manifest.nmf' width='0' height='0'/>
<textarea id="stdin">Type your input here...</textarea>
<pre id='stdout' width='80' height='25'></pre>
<script>
var pnacl = document.getElementById('pnacl');
var stdout = document.getElementById('stdout');
var stdin = document.getElementById('stdin');
pnacl.addEventListener('message', function(ev){stdout.textContent += ev.data;});
</script>
<button onclick="pnacl.postMessage(stdin.value);">Submit</button>
Congratulations! Your program now runs in the browser!
I am not through with porting my compilers, but it seems like this would even work for stuff that uses flex & bison (you only have to copy FlexLexer.h to the include directory of the pnacl sdk and ignore the warnings about the "register" storage location specifier :-)
Are you using the .pexe in a browser? That's the usual case.
I recommend using nacl_io to emulate POSIX in the browser (also look at file_io. This will allow you to save files locally, retrieve them, in any format you fancy.
To send the output use the browser's usual capabilities such as XMLHttpRequest. You need PNaCl to talk to JavaScript for this, you may want to look at some of the examples.
A regular web server will do, it really depends on what you're doing.
I have an Mvx base iOS project which is having problems with image downloads.
I have a couple of screens which contain UICollectionViews and the UICollectionViewCells use MvxDynamicImageHelpers to set the Image of their UIImageViews to images hosted on the internet (Azure blob storage via Azure CDN in actual fact). I have noticed that the images sometimes do not appear and that this is more common on a slow connection and if I scroll through the whole UICollectionView while the images are loading - presumably as it initiates a large number of simultaneous downloads. Restarting the app causes some, but not all, of the images to be shown.
Looking in the Caches/Pictures.MvvmCross folder I see there are a number of files with .tmp extensions and some without .tmp extensions but a 0 byte file size. I presume that the .tmp files are the ones that are re-downloaded following an app restart and that an invalid in-memory cache entry is causing them not to be re-downloaded until this happens.
I have implemented my versions of MvxDownloadRequest and MvxHttpFileDownloader and registered my IMvxHttpFileDownloader. The only modification in MvxHttpFileDownloader is to use my MvxDownloadRequest instead of the standard Mvx one.
As far as I can see, there are no exceptions being thrown in MvxDownloadRequest.Start or MvxDownloadRequest.ProcessResponse and MvxDownloadRequest.FileDownloadFailed is not being called. Having replaced MvxDownloadRequest.Start with the following, all images are always downloaded and displayed successfully:
try
{
ThreadPool.QueueUserWorkItem((state) => {
try
{
var fileService = this.GetService<IMvxSimpleFileStoreService>();
var tempFilePath = DownloadPath + ".tmp";
var imageData = NSData.FromUrl(NSUrl.FromString(Url));
var image = UIImage.LoadFromData(imageData);
NSError nsError;
image.AsPNG().Save(tempFilePath, true, out nsError);
fileService.TryMove(tempFilePath, DownloadPath, true);
}
catch (Exception exception)
{
FireDownloadFailed(exception);
return;
}
FireDownloadComplete();
});
}
catch (Exception e)
{
FireDownloadFailed(e);
}
So, what could be causing the problems with the standard WebRequest which is not affecting the above version? I'm guessing it's something to with GC and will do further debugging when I get time, but this won't be fore a while unfortunately. Would be very much appreciated if someone can answer this or provide pointers for when I do look at it.
Thanks,
J
From the description of your investigations so far, it sounds like you have isolated the problem down to the level that httpwebrequest sometimes fails, but that the NSData methods are 100% reliable.
If this is the case, then it would suggest that the problem is somewhere in the xamarin.ios network stack or in the use of it.
It might be worth checking the xamarin bugzilla repository and also asking their support team if they are aware of any issues in this area. I believe they did make some announcements about changes to the iOS networking at evolve - see the CFNetworkHandler part late in the video and slides at http://xamarin.com/evolve/2013#session-b3mx6e6rmb - and there are worrying questions on here like iPhone app gets into a state where network requests never complete
Beyond that, I'd guess the first step in any debugging would be to isolate the issue in a simple test app - eg a simple app which just downloads one image at a time and which demonstrates a simple pass/fail for each technique. If you can replicate the issue in a small test app, then it'll be much quicker to work out what the issue is.
I'm trying to capture audio using WASAPI. My code is largely based on the ChatterBox VoIP sample app. I'm getting audio buffers, but they are all silent (flagged AUDCLNT_BUFFERFLAGS_SILENT).
I'm using Visual Studio Express 2012 for Windows Phone. Running on the emulator.
I had the exact same problem and managed to reproduce it in the ChatterBox sample app if I set Visual Studio to native debugging and at any point stepped through the code.
Also, closing the App without going through the "Stop" procedure and stopping the AudioClient will require you to restart the emulator/device before being able to capture audio data again.
It nearly drove me nuts before I figured out the before mentioned problems but I finally got it working.
So..
1. Be sure to NOT do native debugging
2. Always call IAudioClient->Stop(); before terminating the App.
3. Make sure you pass the correct parameters to IAudioClient->Initialize();
I've included a piece of code that works 100% of the time for me. I've left out error checking for clarity..
LPCWSTR pwstrDefaultCaptureDeviceId =
GetDefaultAudioCaptureId(AudioDeviceRole::Communications);
HRESULT hr = ActivateAudioInterface(pwstrDefaultCaptureDeviceId,
__uuidof(IAudioClient2), (void**)&m_pAudioClient);
hr = m_pAudioClient->GetMixFormat(&m_pwfx);
m_frameSizeInBytes = (m_pwfx->wBitsPerSample / 8) * m_pwfx->nChannels;
hr = m_pAudioClient->Initialize(AUDCLNT_SHAREMODE_SHARED,
AUDCLNT_STREAMFLAGS_NOPERSIST | AUDCLNT_STREAMFLAGS_EVENTCALLBACK,
latency * 10000, 0, m_pwfx, NULL);
hr = m_pAudioClient->SetEventHandle(m_hCaptureEvent);
hr = m_pAudioClient->GetService(__uuidof(IAudioCaptureClient),
(void**)&m_pCaptureClient);
And that's it.. Before calling this code I've started a worker thread that will listen to m_hCaptureEvent and call IAudioCaptureClient->GetBuffer(); whenever the capture event is triggered.
Of course using Microsoft.XNA.Audio.Microphone works fine to, but it's not always an option to reference the XNA framework.. :)
It was a really annoying problem which waste about 2 complete days of mine.My problem was solved by setting AudioClientProperties.eCatagory to AudioCategory_Communications instead of AudioCategory_Other.
After this long try and error period I am not sure that the problem won't repeat in the future because the API doesn't act very stable and every run may return a different result.
Edit:Yeah my guess was true.Restarting the wp emulator makes the buffer silent again.But changing the AudioClientProperties.eCatagory back to AudioCategory_Other again solve it.I still don't know what is wrong with it and what is the final solution.
Again I encounter the same problem and this time commenting (removing) the
properties.eCategory = AudioCategory_Communications;
solve the problem.
I can add my piece of advice for Windows Phone 8.1.
I made the following experiment.
Open capture device. Buffers are not silent.
Open render device with AudioDeviceRole::Communications. Buffers immediately go silent.
Close render device. Buffers are not silent.
Then I opened capture device with AudioDeviceRole::Communications and capture device works fine all the time.
For Windows 10 capture device works all the time, no matter if you open it with AudioDeviceRole::Communications or not.
I've had the same problem. It seems like you can either use only AudioCategory_Other or create an instance of VoipPhoneCall and use only AudioCategory_Communications.
So the solution in my case was to use AudioCategory_Communications and create an outgoing VoipPhoneCall. You should implement the background agents as in Chatterbox VoIP sample app for the VoipCallCoordinator to work .
We're building an application that makes extensive use of IndexedDB on Firefox to store offline data.
This works well most of the time but occasionally fails with errors like the following:
Exception... "The operation failed because the requested database object could
not be found. For example, an object store did not exist but was being opened."
code: "3" nsresult: "0x80660003 (NS_ERROR_DOM_INDEXEDDB_NOT_FOUND_ERR)"
It seems to fail in various places in the code; here is one of the culprits:
_writePage: (storeName, startIndex, endIndex, binder) ->
writeTransaction = #connection.transaction([storeName], #idbTransaction.READ_WRITE)
store = writeTransaction.objectStore(storeName)
for index in [startIndex...endIndex] when (item = binder.list[index])?
writeRequest = store.put(item)
writeRequest.onerror = binder.failCallback()
writeRequest.onsuccess = binder.successCallback()
if endIndex >= binder.list.length
binder.finishedRegisteringCallbacks()
return
setTimeout((=> #_writePage(storeName, endIndex, endIndex + #WRITE_EACH_PAGE_SIZE, binder)), #WRITE_EACH_PAGE_DELAY)
null
The thing that puzzles me is that the failures occur infrequently, during automated tests that usually work (we're seeing one of these failures per hundreds of executions).
It's worth mentioning that we're storing a lot of data too, in the order of hundreds of megabytes. Turns out the automated tests only store a few megabytes, so it's not a matter of size.
Has anyone else experienced (or better yet, experienced and fixed!) this problem?
This seems to be a Firefox bug. I've raised Bug 751802 - Intermittent IndexedDB write failures and my colleagues and I are busy working with the Firefox folks to help reproduce it.
For the time being there's no workaround or fix.
Check to see if you have multiple tabs open when this happens. If one of those is in a setVersion (old API) or onupgradedneeded (new API) it's probably going to cause problems in the other.
To debug, be sure you're looking for onblocked (vs. onerror) events when opening the DB.
Adding to #Duncan's answer:
On that thread is an idea to throw a catch in db creation/open
https://bugzilla.mozilla.org/show_bug.cgi?id=751802#ch-8