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84 rader
2.7 KiB
84 rader
2.7 KiB
<div class="Box fold">
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<h2>Basic Intro & Nomenclature</h2>
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<div class="Row v">
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<img src="/img/vt100.jpg" class="aside" alt="VT102">
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<p>
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ESPTerm emulates VT102 (pictured) with some additions from later VT models and Xterm.
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All commonly used attributes and commands are supported.
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ESPTerm is capable of displaying ncurses applications such as _Midnight Commander_ using _agetty_.
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</p>
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<p>
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ESPTerm accepts UTF-8 characters received on the communication UART and displays them on the screen,
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interpreting some codes as Control Characters. Those are e.g. _Carriage Return_ (13), _Line Feed_ (10),
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_Tab_ (9), _Backspace_ (8) and _Bell_ (7).
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</p>
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<p>
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Escape sequences start with the control character _ESC_ (27),
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followed by any number of ASCII characters forming the body of the command.
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</p>
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<h3>Nomenclature & Command Types</h3>
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<p>
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Examples on this help page use the following symbols for special characters and command types:\\
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(spaces are for clarity only, _DO NOT_ include them in the commands!)
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</p>
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<div class="tscroll">
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<table class="nomen">
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<thead><tr><th>Name</th><th>Symbol</th><th>ASCII</th><th>C string</th><th>Function</th></tr></thead>
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<tbody>
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<tr>
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<td>*ESC*</td>
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<td>`\e`</td>
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<td>`ESC` (27)</td>
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<td>`"\e"`, `"\x1b"`, `"\033"`</td>
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<td>Introduces an escape sequence. _(Note: `\e` is a GCC extension)_</td>
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</tr>
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<tr>
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<td>*Bell*</td>
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<td>`\a`</td>
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<td>`BEL`~(7)</td>
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<td>`"\a"`, `"\x7"`, `"\07"`</td>
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<td>Audible beep</td>
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</tr>
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<tr>
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<td>*String Terminator*</td>
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<td>`ST`</td>
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<td>`ESC \`~(27~92)<br>_or_~`\a`~(7)</td>
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<td>`"\x1b\\"`, `"\a"`</td>
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<td>Terminates a string command (`\a` can be used as an alternative)</td>
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</tr>
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<tr>
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<td>*Control Sequence Introducer*</td>
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<td>`CSI`</td>
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<td>`ESC [`</td>
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<td>`"\x1b["`</td>
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<td>Starts a CSI command. Examples: `\e[?7;10h`, `\e[2J`</td>
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</tr>
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<tr>
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<td>*Operating System Command*</td>
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<td>`OSC`</td>
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<td>`ESC ]`</td>
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<td>`"\x1b]"`</td>
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<td>Starts an OSC command. Is followed by a command string terminated by `ST`. Example: `\e]0;My Screen Title\a`</td>
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</tr>
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<tr>
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<td>*Select Graphic Rendition*</td>
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<td>`SGR`</td>
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<td>`CSI <i>n</i>;<i>n</i>;<i>n</i>m`</td>
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<td>`"\x1b[1;2;3m"`</td>
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<td>Set text attributes, like color or style. 0 to 10 numbers can be used, `\e[m` is treated as `\e[0m`</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>There are also some other commands that don't follow the CSI, SGR or OSC pattern, such as `\e7` or
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`\e#8`. A list of the most important escape sequences is presented in the following sections.</p>
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</div>
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</div>
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