UM0851 datasheet(104/245 Pages) STMICROELECTRONICS

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Communication device drivers

UM0851

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Doc ID 16604 Rev 2

/*Enable the receiver and set local mode....*/

options.c_cflag|= (CLOCAL | CREAD);

/*Set the new options for the port..........*/

ioctl(fd,TCSETS,&options);

read(fd,s,10);

close(fd);

return 0;

}

The other functions of the I/O ports like the modem control operations can also be controlled

by adding some modem control functions to this application.

Some important TTY commands

●

Getty

getty opens a TTY port, prompts for a login name and invokes the /bin/login command.

The getty command sets and manages terminals by setting up the speed, the terminal

flags, and the line discipline.

Example:

/sbin/getty 9600 ttyS1

●

Stty

stty is used to change and print the terminal line settings.

/* List the attribute settings for a terminal that has a user logged on it

already.*/

stty -a -F /dev/ttyS0

/* Disable modem control signals. */

stty clocal -F /dev/ttyS0

/* Enable RTS/CTS handshaking */

stty crtscts -F /dev/ttyS0

/* Set the baud rate of current terminal to 9600 baud. */

stty baud=9600

4.8.4

Configuration options

Table 34.

UART menuconfig kernel options

Configuration option

Comment

CONFIG_SERIAL_CORE

This option enables UART tty framework.

CONFIG_SERIAL_CORE_CONSOLE

This option enables UART console framework.

CONFIG_SPEAR_SERIAL_PL011

This option enables SPEAr UART driver support

for TTY framework.

CONFIG_SPEAR_SERIAL_PL011_CONSOLE

This option enables SPEAr UART driver support

for console framework.

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