EM-1220 LX User’s Manual
EM-1220-LX Device API
RTC (Real-time Clock)
The device node is located at
/dev/rtc
. The EM-1220-LX supports µClinux standard simple
RTC control. You must include
<linux/rtc.h>
to use these functions.
1.
Function: RTC_RD_TIME
int ioctl(fd, RTC_RD_TIME, struct rtc_time *time);
Description: Reads time information from RTC.
2.
Function: RTC_SET_TIME
int ioctl(fd, RTC_SET_TIME, struct rtc_time *time);
Description: Sets RTC time.
Buzzer
The device node is located at
/dev/console
. The EM-1220-LX supports µClinux standard
buzzer control. The EM-1220-LX’s buzzer runs at a fixed frequency of 100 Hz. You must include
<sys/kd.h>
to use these functions.
1.
Function: KDMKTONE
ioctl(fd, KDMKTONE, unsigned int arg);
Description: Buzzer will beep, as stipulated by the function
arguments.
UART Interface
The normal tty device node is located at
/dev/ttyM0…ttyM1
, and the modem tty device node is
located at
/dev/com0 … com1
. The EM-1220-LX Series supports µClinux standard termios
control. The Moxa UART Device API supports configurations ttyM0 to ttyM1, as RS-232/422/485.
To use these functions, after the Tool Chain package is installed, include
<moxadevice.h>
in your
application.
#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 mode;
mode=
which mode you want to set
;
int ioctl(fd, MOXA_SET_OP_MODE, &mode)
Description: Sets the interface mode.
2.
Function: MOXA_GET_OP_MODE
int mode;
int ioctl(fd, MOXA_GET_OP_MODE, &mode)
Description: Gets the interface mode.
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