termios | 易学教程

How to distinguish between Escape and Escape Sequence

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问题 My end goal is to distinguish between my pressing Esc (ASCII 27 ) on my keyboard, and me pressing the → key on my keyboard (which translates to a sequence of 27 91 67 ). I am using termios to put my terminal into non-Canonical mode. I think I understand there are two options: Wait some arbitrary amount of time to see if something comes in (seems hacky) Check STDIN to see if it is empty I'm trying to do the latter. To that end, I'm trying to use select to see if stdin is empty or not. The

Canonical Mode Linux Serial Port

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问题 The Termios man pages (http://man7.org/linux/man-pages/man3/termios.3.html) for canonical mode state: Input is made available line by line. An input line is available when one of the line delimiters is typed (NL, EOL, EOL2; or EOF at the start of line). Except in the case of EOF, the line delimiter is included in the buffer returned by read(2). My question is: when a piece of hardware outputs data to be canonical compliant - is it putting the 0xD0xA (CRLF) bytes at the beginning of the

Ubuntu Serial Communication: reads failing and then coming in all at once

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问题 I'm writing a program that runs on a MIO-3260 single board computer running Ubuntu server 14.04 and communicates with a AMC DPRANIE C100A400 drive. The program sends a string of hex codes to the drive and is supposed to receive a response for every message it sends. When I try it in realTerm on windows this works well so I don't think it's an issue with the drive. However, when I try to read from the serial port read() returns -1 almost all the time, until suddenly at a seemingly random point

How to read a binary data over serial terminal in C program?

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I read followed links and other sources, but didn't find answer for my question. Binary data over serial terminal Data gets corrupted during transmission over the serial port I communicate with my embedded device through a serial port. By default, embedded Linux uses this port as a terminal. But I want to transfer also binary data (service packets) through the port. My /etc/inittab file has a "getty" call: console::respawn:/sbin/getty 115200 ttyS0 I also have /etc/passwd file with string where "admin" user launch my "cli" application after log in: admin:8Mt/Jtxcyg8AY:1000:0:admin:/tmp:/tmp/cli

How to read a binary data over serial terminal in C program?

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问题 I read followed links and other sources, but didn\'t find answer for my question. Binary data over serial terminal Data gets corrupted during transmission over the serial port I communicate with my embedded device through a serial port. By default, embedded Linux uses this port as a terminal. But I want to transfer also binary data (service packets) through the port. My /etc/inittab file has a \"getty\" call: console::respawn:/sbin/getty 115200 ttyS0 I also have /etc/passwd file with string

Linux Blocking vs. non Blocking Serial Read

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问题 i have this code for reading from Serial in Linux , but i don\'t know what is the difference between blocking and non blocking in reading Serial Port and which one is better in which situation? 回答1: The code you mention is IMO poorly coded and commented. That code does not conform to POSIX practices for portability as described in Setting Terminal Modes Properly and Serial Programming Guide for POSIX Operating Systems. That code does not mention that it uses non-canonical (aka raw) mode, and