Advantech EKI-1121L, Руководство пользователя

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EKI-1121L/1122L/1124L User Manual 40
Then, use the following instructions to set the termios structure, followed by the
tcsetattr function to set the new configuration.
switch(gMode) {
case MODE_RS232:
PortTermios.c_iflag &= ~IRS422;
PortTermios.c_iflag &= ~IRS485;
break;
case MODE_RS422:
PortTermios.c_iflag |= IRS422;
PortTermios.c_iflag &= ~IRS485;
break;
case MODE_RS485:
PortTermios.c_iflag &= ~IRS422;
PortTermios.c_iflag |= IRS485;
break;
}
//Set the new serial port interface type
tcsetattr(portHandle, TCSANOW, &PortTermios);
For a complete example of serial port configuration, please see the provided seria-
lecho.c example.
4.3.2 RTC APIs
To access a RTC device, you simply open the corresponding device file.
4.3.3 LED APIs
To access a LED device, you simply open the corresponding device file.
Developing in C, you will first need to include the <stdio.h> <sys/types.h> <sys/
ioctl.h> <unistd.h> and "ledman.h" header file to use the required functions.
Then, use the following program to set the command, followed by the ioctl function to
control leds.
if(flag)
{
flag = 0;
cmd = LEDMAN_CMD_ON;
/*your action*/
}
Peripheral Device File
Real Time Clock /dev/rtc
Peripheral Device File
LED Indicator /dev/led