매개변수에 지정된 시간(마이크로 초)동안 프로그램을 멈춘다. 1밀리초는 1000 마이크로 초, 1초는 100만 마이크로 초. 현재, 정확한 delay를 만드는 가장 큰 값은 16383. 미래의 아두이노 릴리스에서 바뀔 수 있다. delay 가 몇 천 마이크로 초 보다 길면, 대신delay()를 써야 한다.
문법
delayMicroseconds(us)
매개변수
us: 멈출 마이크로 초 (unsigned int)
반환
없음
예제 코드
이 코드는 핀번호 8이 출력 핀으로 동작하도록 구성한다. 약 100 마이크로 초의 펄스 열을 보낸다. 근사값은 코드에서 다른 명령 실행으로 인한 것이다.
int outPin = 8; // 디지털 핀 8
void setup() {
pinMode(outPin, OUTPUT); // 디지털 핀을 출력으로
}
void loop() {
digitalWrite(outPin, HIGH); // 핀을 켠다
delayMicroseconds(50); // 50 마이크로 초 쉰다
digitalWrite(outPin, LOW); // 핀을 끈다
delayMicroseconds(50); // 50 마이크로 초 쉰다
}
주의와 경고
이 함수는 3 마이크로 초 이상 범위에서 매우 정확하게 돌아간다. delayMicroseconds 가 작은 지연시간동안 정확히 수행한다고 보장할 수 없다. 아두이노 0018 현재, delayMicroseconds() 는 더이상 인터럽트를 비활성화 하지 않는다.
I use curly braces with all of my switch case statements in C/Objective-C/C++
I had not, until a few moments ago, considered whether including thebreak;statement inside the braces was good or bad practice. I suspect that it doesn't matter, but I figure it is still worth asking.
Just a give a slightly more detailed answer...
The official C99 specification says the following about the break statement:
A break statement terminates execution of the smallest enclosing switch or iteration statement.
So it really doesn't matter. As for me, I put the break inside the curly braces. Since you can also have breaks in other places inside your curly braces, it's more logical to also have the ending break inside the braces. Kind of like the return statement.
Are you encountering RSS feed errors on your WordPress site?RSS feedshelp users subscribe to your blog using news reader apps like Feedly.
Since RSS feeds are published in the XML markup language, a tiny mistake in the feed can make it unreadable, and users will not be able to see new content in their news feeds.
Other apps also rely on getting content updates from your WordPress RSS feed. For example, if you useIFTTT to automate social sharingof your new posts, then that would stop working as well.
In this article, we will show you how to easily fix RSS feed errors in WordPress. We will also talk about what causes those errors and how to avoid them in the future.
WordPress outputs RSS feeds in XML which is a strict markup language. A missing line break or an extra tab can break your RSS feed.
The RSS error message will look something like this:
XML Parsing Error: XML or text declaration not at start of entity Location: http://example.com/feed Line Number 2, Column 1:
Depending on what browser you are using, your RSS feed error message may vary.
You can also see this error message when visiting your feed in a browser.
Warning: Cannot modify header information – headers already sent by (output started at /home/username/example.com/wp-content/themes/twentysixteen/functions.php:433) in /home/username/example.com/wp-includes/pluggable.php on line 1228
If you are usingFeedBurner, then your errors may look different.
Having said that, let’s take a look at what causes these RSS feed errors and how to fix them.
Manually Fixing RSS Feed Errors in WordPress
The most likely reason for your RSS feeds to show error is poor formatting. This poor formatting can be caused by a blank space after closing PHP tag in a plugin or in your theme’sfunctions.phpfile.
If you recently added a code snippet to your theme orchild theme‘s functions.php file. Then you need to edit your functions file.
If there is a closing PHP tag at the end of your functions file, then you need to make sure that there is no extra space or line breaks after it.
Ideally, the closing PHP tag is not required at the end of the file. This is why it would be best if you remove the closing php tag altogether.
This should fix the problem in most cases. However, if it does not fix your RSS feed error, then continue reading.
Disable RSS Feed Related Plugins
If you are using a WordPress plugin that modifies your website’s RSS feed or creates a new one, then you need to disable that plugin.
Next, check your RSS feed for the error. If the error disappears, then this means one of the plugins installed on your website was the culprit.
You can now reactivate your installed plugins one by one and check your RSS feed after activating each plugin. This way you will be able to find out exactly which plugin is causing the issue.
Once you have located the plugin, you can contact the plugin’s support for an update or find an alternative plugin that does the same thing.
Temporarily Switch to a Default Theme
Occasionally, a poorly coded WordPress theme function can also affect your WordPress RSS feed. To see if the problem is caused by your WordPress theme, you need to temporarily switch to a default WordPress theme.
Simply go toAppearance » Themespage and if you already have a default theme installed then activate it.
Default themes include Twenty Nineteen, Twenty Seventeen, Twenty Sixteen, and so on. If you don’t have one installed on your website, then you can click on the Add New button to install and activate it. See our guide onhow to install a WordPress themefor step by step instructions.
After switching to the default theme, check your WordPress feed for error. You can visit your feed in a browser window or test it with afeed validatortool.
If the error disappears, then this means your WordPress theme was causing the issue. You can contact the theme author for support or find a suitable new theme for your website.
