`stty` Terminal Configuration

Description

The stty command provides a standard Unix-like interface for viewing and configuring terminal (TTY) device settings at runtime via termios. It supports raw/cooked mode switching, individual flag control, baud rate configuration, and VMIN/VTIME parameters.

Usage

Basic Syntax

stty [options] [settings...]

Options:

`-F <dev>`	Operate on the specified device instead of stdin
`-h`	Show help message

Settings

Setting	Description
`raw`	Set raw mode (no input/output processing)
`cooked`	Set cooked mode (canonical with echo)
`echo`	Enable echo
`-echo`	Disable echo
`icanon`	Enable canonical mode
`-icanon`	Disable canonical mode
`icrnl`	Map CR to NL on input
`-icrnl`	Don’t map CR to NL
`onlcr`	Map NL to CR-NL on output
`-onlcr`	Don’t map NL to CR-NL
`opost`	Enable output processing
`-opost`	Disable output processing
`isig`	Enable signal characters
`-isig`	Disable signal characters
`inlcr`	Map NL to CR on input
`-inlcr`	Don’t map NL to CR on input
`igncr`	Ignore CR on input
`-igncr`	Don’t ignore CR on input
`ocrnl`	Map CR to NL on output
`-ocrnl`	Don’t map CR to NL on output
`speed N`	Set baud rate
`min N`	Set VMIN (minimum chars for read, 0-255)
`time N`	Set VTIME (read timeout in 0.1s, 0-255)

Examples

# Display current settings for /dev/ttyS0
nsh> stty -F /dev/ttyS0

# Set raw mode for binary communication
nsh> stty -F /dev/ttyS0 raw -echo

# Set cooked mode for interactive terminal
nsh> stty -F /dev/ttyS0 cooked

# Configure baud rate
nsh> stty -F /dev/ttyS1 speed 115200

# Set non-blocking read with timeout
nsh> stty -F /dev/ttyS0 min 0 time 10

# Display current settings for stdin
nsh> stty

Configuration

CONFIG_SYSTEM_STTY

Options:

CONFIG_SYSTEM_STTY_PRIORITY - Task priority (default 100)
CONFIG_SYSTEM_STTY_STACKSIZE - Stack size (default DEFAULT_TASK_STACKSIZE)

Dependencies

CONFIG_SERIAL_TERMIOS - Required for termios support