User`s manual

ThinkCore IA241/240 Linux User’s Manual Programmer’s Guide
6-6
time.tv_sec = msec / 1000;
time.tv_usec = (msec % 1000) * 1000;
select(1, NULL, NULL, NULL, &time);
}
static int swtdfd;
static int stopflag=0;
static void stop_swatchdog()
{
stopflag = 1;
}
static void do_swatchdog(void)
{
swtd_enable(swtdfd, 500);
while ( stopflag == 0 ) {
mydelay(250);
swtd_ack(swtdfd);
}
swtd_disable(swtdfd);
}
int main(int argc, char *argv[])
{
pid_t sonpid;
signal(SIGUSR1, stop_swatchdog);
swtdfd = swtd_open();
if ( swtdfd < 0 ) {
printf(“Open sWatchDog device fail !\n”);
exit(1);
}
if ( (sonpid=fork()) == 0 )
do_swatchdog();
// do user application main function
…..
…..
…..
// end user application
kill(sonpid, SIGUSR1);
swtd_close(swtdfd);
exit(1);
}
The makefile is shown below:
all:
arm-linux-gcc –o xxxx xxxx.c –lmoxalib
UART
The normal tty device node is located at /dev/ttyM0 … ttyM3 .
The IA241/240 supports Linux standard termios control. The Moxa UART Device API allows you
to configure ttyM0 to ttyM3 as RS-232, RS-422, 4-wire RS-485, or 2-wire RS-485. IA241/240
supports RS-232, RS-422, 2-wire RS-485, and 4-wire RS485.
You must
include <moxadevice.h> .
#define RS232_MODE 0
#define RS485_2WIRE_MODE 1
#define RS422_MODE 2
#define RS485_4WIRE_MODE 3