Moxa UC-8410A-LX [69/86] Brtc real time clock

UC-8410A Series Linux Software Programmer’s Guide

6-7

moxa@Moxa:~$ ./hello-release

Hello World

Makefile Example

The following Makefile is copied from the Hello example on the UC-8410A-LX’s example package. It is used for

cross compiling.

CC = arm-linux-gnueabihf-gcc

CPP = arm-linux-gnueabihf-g++

SOURCES = hello.c

OBJS = $(SOURCES:.c=.o)

all: hello

hello: $(OBJS)

$(CC) -o $@ $^ $(LDFLAGS) $(LIBS)

clean:

rm -f $(OBJS) hello core *.gdb

For native compiling, change:

CC = gcc

CPP = g++

Modbus

The Modbus protocol is a messaging structure used to establish master-slave/client-server communication

between intelligent devices. It is a de facto standard, truly open, and the most widely used network protocol in

industrial manufacturing environments. It has been implemented by hundreds of vendors on thousands of

different devices to transfer discrete/analog I/O and register data between control devices.

The libmodbus version in Debian 8 is v3.0.6. We use libmodbus as our modbus package. Download the source

and example code from the following link.

http://libmodbus.org/releases/libmodbus-3.0.6.tar.gz

NOTE

Click the following li

nk for more information about libmodbus:

http://libmodbus.org/

RTC (Real Time Clock)

The device node is located at /dev/rtc0. The UC-8410A-LX series supports Linux standard simple RTC control.

You must

include <linux/rtc.h

in your program to use the following functions.

Function RTC_RD_TIME

Description Reads time information from the RTC; returns the value of argument 3.

Usage struct rtc_time rtc_tm;

ioctl(fd, RTC_RD_TIME, &rtc_tm);

Function RTC_SET_TIME

Description Sets the RTC time. Argument 3 will be passed to the RTC.

Usage struct rtc_time rtc_tm;

ioctl(fd, RTC_SET_TIME, &rtc_tm);

Function RTC_ALM_SET

Description Sets the alarm time.

Usage struct rtc_time rtc_tm;

ioctl(fd, RTC_ALM_SET, &rtc_tm);

Moxa UC-8410A-LX [69/86] Brtc real time clock

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