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串口Read不到数据的问题 - 用户反馈 - 清泛IT社区，为创新赋能！
用户发送的是 8n1 的格式，但是ai2的串口貌似不支持这种格式。写串口正常，读串口为空，len为0。
目前经过测试验证，应该是 \n 作为结束符的。发送时，也是。
ai2使用 physicaloid 库完成的串口功能。
Pro Camera 扩展：专业级自定义相机，提供滤镜、降噪、对焦等高级功能 · A...
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属性
IsFlashAvailable 闪光灯可用 {:.boolean .read-only}
返回设备是否支持闪光灯功能。
IsFocusAvailable 对焦可用 {:.boolean .read-only}
返回设备是否支持自动对焦功能。
IsZoomAvailable 缩放可用 {:.boolean .read-only}
返回设...
MySQL Insert into multiple tables? (Database normalization?)
...ver crashes). If you can live with "some have finished, others not", don't read on.
If however you decide "either all queries finish, or none finish - I do not want rows in some tables but no matching rows in others, I always want my database tables to be consistent", you need to wrap all statement...
How to use SharedPreferences in Android to store, fetch and edit values [closed]
...getSharedPreferences(
"com.example.app", Context.MODE_PRIVATE);
To read preferences:
String dateTimeKey = "com.example.app.datetime";
// use a default value using new Date()
long l = prefs.getLong(dateTimeKey, new Date().getTime());
To edit and save preferences
Date dt = getSomeDate();...
Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?
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You may want to read http://research.google.com/pubs/pub37077.html
TL;DR: randomly inserting nop instructions in programs can easily increase performance by 5% or more, and no, compilers cannot easily exploit this. It's usually a combinatio...
Should I prefer pointers or references in member data?
...at it makes the code easier to write it's that it makes the code easier to read. With a reference as a data member you never have to wonder if it can be null at point of use. This means that you can look at code with less context required.
– Len Holgate
Jan 4 '...
When saving, how can you check if a field has changed?
...requires making alterations to your model, this one does not 3) as you can read in the comments on that answer, it has side-effects that can be potentially problematic, this solution does not
– Chris Pratt
Oct 31 '11 at 22:10
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Difference between single and double square brackets in Bash
I'm reading bash examples about if but some examples are written with single square brackets:
6 Answers
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SQL: IF clause within WHERE clause
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@Kash the link you provided is a register-to-read, is there any publicly available documenation that describes what you are saying?
– Steve
Mar 14 '13 at 19:26
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Android – Listen For Incoming SMS Messages
...coming SMS messages, and launch a program via incoming SMS, also it should read the content from the SMS.
9 Answers
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