最後更新: 2023-09-29

stty 介紹

 

change and print terminal line settings

 

---

Usage

 

i.e. Get Setting Serial Port Settings

# -F, --file=DEVICE      open and use the specified DEVICE instead of stdin

stty -F /dev/ttyUSB0

speed 9600 baud; line = 0;
-brkint -imaxbel

# -a, --all                    print all current settings in human-readable form

stty -a -F /dev/ttyUSB0

# Part 1
speed 9600 baud; rows 0; columns 0; line = 0;
# Part 2
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>;
start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; discard = ^O;
# Part 3
min = 1; time = 0;
# Part 4
-parenb -parodd -cmspar cs8 hupcl -cstopb cread clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff -iuclc -ixany -imaxbel -iutf8
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke -flusho -extproc

說明

Part 1

rows 0; columns 0; line = 0;

• rows N              # tell the kernel that the terminal has N rows
• columns N         # same as cols N
• line N                # use line discipline N

Part 2

intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>;
start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; discard = ^O;

• intr = ^C;           SIGINT signal is usually triggered by Control+C

Part 3

min = 1; time = 0

The reading program will read until at least one character has been read and there is no timeout.

With "-icanon"

• set N characters minimum for a completed read
• set read timeout of N tenths of a second

parenb

generate parity bit in output and expect parity bit in input

parodd

set odd parity

cmspar

use "stick" (mark/space) parity

csN

set character size to N bits, N in [5..8]

i.e. cs8

hupcl

same as hup

hup send a hangup signal when the last process closes the tty

cstopb

use two stop bits per character

cread

allow input to be received

clocal

disable modem control signals

crtscts
              enable RTS/CTS handshaking

icrnl

translate carriage return to newline

i.e.

\r\n -> \n\n

isig

enable interrupt, quit, and suspend special characters

icanon

enable special characters: erase, kill, werase, rprnt

iexten

enable non-POSIX special characters

echo

echo input characters

echoe

same as crterase        

echo erase characters as backspace-space-backspace

echok
              echo a newline after a kill character

echonl

echo newline even if not echoing other characters

noflsh

disable flushing after interrupt and quit special characters

xcase

with icanon, escape with '\' for uppercase characters

tostop

stop background jobs that try to write to the terminal

echoprt

echo erased characters backward, between '\' and '/'

echoctl

same as [-]ctlecho

echo control characters in hat notation ('^c')

echoke

same as crtkill

kill all line by obeying the echoprt and echoe settings

flusho

discard output

extproc

enable "LINEMODE"; useful with high latency links

 

---

應用

 

i.e. Set baud rate

stty -F /dev/ttyS0 speed 9600

9600

i.e. stty reset to default

# sane   相當於一堆 settings 的 default value (cread -ignbrk brkint ...)
# 不包括 (baud rate, parity, ... )

stty -F /dev/ttyUSB0 sane

i.e. 讓 cat 會自動中止

i.e. ch340+STM8S103 控制的 relay switch

stty -F /dev/ttyUSB0 -icanon min 0 time 10

stty -F /dev/ttyUSB0

speed 9600 baud; line = 0;
min = 0; time = 10;
-icanon

echo -n -e '\xff' > /dev/ttyUSB0

cat /dev/ttyUSB0