Serial Programming: Difference between revisions
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== References == |
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* [http://www.faqs.org/docs/Linux-HOWTO/Serial-Programming-HOWTO.html Serial Programming HOWTO] |
* [http://www.faqs.org/docs/Linux-HOWTO/Serial-Programming-HOWTO.html Serial Programming HOWTO] |
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* [http://www.easysw.com/~mike/serial/serial.html Serial Programming Guide for POSIX Operating System] |
* [http://www.easysw.com/~mike/serial/serial.html Serial Programming Guide for POSIX Operating System] |
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* [http://read.pudn.com/downloads130/ebook/556289/Serial%20port%20programming%20for%20Windows%20and%20Linux.pdf Serial Port Programming in Windows and Linux] |
* [http://read.pudn.com/downloads130/ebook/556289/Serial%20port%20programming%20for%20Windows%20and%20Linux.pdf Serial Port Programming in Windows and Linux] |
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== How-To == |
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=== Flush Serial Buffers === |
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Use constant <code>TCSAFLUSH</code> for function <code>tcsetattr</code> (see [http://www.linuxquestions.org/questions/linux-general-1/flush-the-serial-buffer-403127/] and [http://www.easysw.com/~mike/serial/serial.html]): |
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{| class="wikitable" |
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|+|Constants for <tt>tcsetattr</tt> |
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|- |
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!Constant!!Description |
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|- |
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|TCSANOW||Make changes now without waiting for data to complete |
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|- |
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|TCSADRAIN||Wait until everything has been transmitted |
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|- |
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|TCSAFLUSH||Flush input and output buffers and make the change |
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|} |
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This can be done even on a serial port that is already configured: |
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<source lang="c"> |
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struct termios options; |
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tcgetattr(fd, &options); // Get current configuration of this port |
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cfsetispeed(&options, B115200); // Configure some port options (e.g. baud rate...) |
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... |
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tcsetattr(fd, TCSANOW, &options); // Apply the new settings immediately |
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... // Read / Write to the port... |
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tcsetattr(fd, TCSAFLUSH, &options); // Flush IO buffer |
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</source> |
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Revision as of 21:09, 26 October 2011
References
- Serial Programming HOWTO
- Serial Programming Guide for POSIX Operating System
- Serial Port Programming in Windows and Linux
How-To
Flush Serial Buffers
Use constant TCSAFLUSH for function tcsetattr (see [1] and [2]):
| Constant | Description |
|---|---|
| TCSANOW | Make changes now without waiting for data to complete |
| TCSADRAIN | Wait until everything has been transmitted |
| TCSAFLUSH | Flush input and output buffers and make the change |
This can be done even on a serial port that is already configured:
struct termios options;
tcgetattr(fd, &options); // Get current configuration of this port
cfsetispeed(&options, B115200); // Configure some port options (e.g. baud rate...)
...
tcsetattr(fd, TCSANOW, &options); // Apply the new settings immediately
... // Read / Write to the port...
tcsetattr(fd, TCSAFLUSH, &options); // Flush IO buffer