Moxa DA-662A-I-8-LX [57/63] Example for setting the baudrate

Moxa DA-662A-I-8-LX [57/63] Example for setting the baudrate

DA-662A Series Software Programmer's Guide

5-10

swtd_close(swtdfd);

exit(1);

}

The makefile is shown below:

all:

arm-none-linux-gnueabi-gcc –o xxxx xxxx.c –lmoxalib

UART

The normal tty device node is located at /dev/ttyM0 … ttyM15, and the modem tty device node is located at

/dev/cum0 … cum15.

The DA-662A series supports Linux standard termios control. The Moxa UART Device API allows you to

configure ttyM0 to ttyM7 as RS-232, RS-422, 4-wire RS-485, or 2-wire RS-485. The DA-662A series supports

RS-232, RS-422, 2-wire RS-485, and 4-wire RS485.

You must use include <moxadevice.h>.

#define RS232_MODE 0

#define RS485_2WIRE_MODE 1

#define RS422_MODE 2

#define RS485_4WIRE_MODE 3

1. Function: MOXA_SET_OP_MODE

int ioctl(fd, MOXA_SET_OP_MODE, &mode)

Description

Set the interface mode. Argument 3 mode will pass to the UART device driver and change it.

2. Function: MOXA_GET_OP_MODE

int ioctl(fd, MOXA_GET_OP_MODE, &mode)

Description

Get the interface mode. Argument 3 mode will return the interface mode.

There are two Moxa private ioctl commands for setting up special baudrates.

Function: MOXA_SET_SPECIAL_BAUD_RATE

Function: MOXA_GET_SPECIAL_BAUD_RATE

If you use this ioctl to set a special baudrate, the termios cflag will be B4000000, in which case the B4000000

define will be different. If the baudrate you get from termios (or from calling tcgetattr()) is B4000000, you

must call ioctl with MOXA_GET_SPECIAL_BAUD_RATE to get the actual baudrate.

Example for setting the baudrate

#include <moxadevice.h>

#include <termios.h>

struct termios term;

int fd, speed;

fd = open(“/dev/ttyM0”, O_RDWR);

tcgetattr(fd, &term);

term.c_cflag &= ~(CBAUD | CBAUDEX);

term.c_cflag |= B4000000;

tcsetattr(fd, TCSANOW, &term);

speed = 500000;

ioctl(fd, MOXA_SET_SPECIAL_BAUD_RATE, &speed);

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