serial tty

UART
Universal Asynchronous Receiver / Transmitterund
stty (coreutils)
change and print terminal line settings. e.g. sudo stty -F /dev/ttyS0 -a to show all settings

default port and IRQ config for serials (depends on the driver)

$ sudo cat /proc/tty/driver/serial

/dev/   Name    IO Port     UART    IRQ

ttyS0   COM1    0x3F8       16550A  4
ttyS1   COM2    0x2F8               3
ttyS2   COM3    0x3E8               4
ttyS3           0x2E8               3
ttyS4           0xE080      16550A  19

getting tty configs (i.e. protocol for communication…)

$ sudo stty -F /dev/ttyS0 -a
speed 9600 baud; rows 0; columns 0; line = 0;
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; min = 1; time = 0;
-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

Refs





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