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Add tty line configuration script API

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On some platforms calling high()/low() to switch line states result in
costly system calls whick makes it impossible to swith two or more tty
lines simultaneously.

To help solve this timing issue we introduce a tty line state
configuration API which can be used instead of using
high()/low().

Using config_low(line) and config_high(line) one can set up a new line
state configuration for multiple lines and then use config_apply() to
finally apply the configuration. This will result in only one system
call to instruct the serial port drive to switch all the configured line
states which should help ensure that the lines are switched
simultaneously.

Example:

script = config_high(DTR); config_low(RTS); config_apply()
This commit is contained in:
Martin Lund 2024-04-06 09:17:01 +02:00
parent 4369d5b66f
commit 3e50191107
4 changed files with 167 additions and 77 deletions
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104
src/script.c
View file

@ -27,6 +27,7 @@
#include <lauxlib.h>
#include <lualib.h>
#include <sys/ioctl.h>
#include "misc.h"
#include "print.h"
#include "options.h"
#include "tty.h"
@ -67,60 +68,6 @@ static int msleep(lua_State *L)
return 0;
}
static void script_line_set(int line, bool value)
{
switch (line)
{
case TIOCM_DTR:
tty_line_set(serial_fd, "DTR", line, value);
break;
case TIOCM_RTS:
tty_line_set(serial_fd, "RTS", line, value);
break;
case TIOCM_CTS:
tty_line_set(serial_fd, "CTS", line, value);
break;
case TIOCM_DSR:
tty_line_set(serial_fd, "DSR", line, value);
break;
case TIOCM_CD:
tty_line_set(serial_fd, "CD", line, value);
break;
case TIOCM_RI:
tty_line_set(serial_fd, "RI", line, value);
break;
default:
break;
}
}
static void script_line_toggle(int line)
{
switch (line)
{
case TIOCM_DTR:
tty_line_toggle(serial_fd, "DTR", line);
break;
case TIOCM_RTS:
tty_line_toggle(serial_fd, "RTS", line);
break;
case TIOCM_CTS:
tty_line_toggle(serial_fd, "CTS", line);
break;
case TIOCM_DSR:
tty_line_toggle(serial_fd, "DSR", line);
break;
case TIOCM_CD:
tty_line_toggle(serial_fd, "CD", line);
break;
case TIOCM_RI:
tty_line_toggle(serial_fd, "RI", line);
break;
default:
break;
}
}
// lua: high(line)
static int high(lua_State *L)
{
@ -131,7 +78,7 @@ static int high(lua_State *L)
return 0;
}
script_line_set(line, LINE_HIGH);
tty_line_set(serial_fd, line, LINE_HIGH);
return 0;
}
@ -146,7 +93,7 @@ static int low(lua_State *L)
return 0;
}
script_line_set(line, LINE_LOW);
tty_line_set(serial_fd, line, LINE_LOW);
return 0;
}
@ -161,7 +108,47 @@ static int toggle(lua_State *L)
return 0;
}
script_line_toggle(line);
tty_line_toggle(serial_fd, line);
return 0;
}
// lua: config_high(line)
static int config_high(lua_State *L)
{
long line = lua_tointeger(L, 1);
if (line < 0)
{
return 0;
}
tty_line_config(line, true);
return 0;
}
// lua: config_low(line)
static int config_low(lua_State *L)
{
long line = lua_tointeger(L, 1);
if (line < 0)
{
return 0;
}
tty_line_config(line, false);
return 0;
}
// lua: config_apply(line)
static int config_apply(lua_State *L)
{
UNUSED(L);
tty_line_config_apply();
return 0;
}
@ -186,6 +173,9 @@ static const struct luaL_Reg tio_lib[] =
{ "high", high},
{ "low", low},
{ "toggle", toggle},
{ "config_high", config_high},
{ "config_low", config_low},
{ "config_apply", config_apply},
{NULL, NULL}
};