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//??3ìDòê?ò????￡·?2é?ˉμ?μ?3ìDò￡???ìy?ˉé￠?÷·￠à?μ?μ??·??á?￡?è?1?ê?×??oμ?μ??·￡??ò·￠?íêy?Y￡?·??òo?????á??￡

#include

#include

#include

#include

#include

#include

#include

#include

#include

#define BAUDRATE B115200

//#define MyAddr 1

#define MODEMDEVICE "/dev/ttyS0"

#define _POSIX_SOURCE 1 /*POSIX compliant source POSIX?μí3??èY*/

#define FALSE 0

#define TRUE 1;

volatile int SENT=FALSE;

int fd;

void openserial()

{

struct termios oldtio;

fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY);

if (fd <0) {perror(MODEMDEVICE); exit(-1); }

tcgetattr(fd,&oldtio);

oldtio.c_cflag|=(CLOCAL|CREAD);

oldtio.c_iflag = IGNPAR ;????? /*o???????D￡?ìDòáD*/

oldtio.c_oflag=0;

oldtio.c_cc[VTIME]??? = 0;???? /* inter-character timer unused */

oldtio.c_cc[VMIN]???? = 5;???? /* blocking read until 5 character arrives */

cfmakeraw(&oldtio);

cfsetispeed(&oldtio,B115200); /*2?ì??êéè???a9600bps*/

cfsetospeed(&oldtio,B115200);

tcsetattr(fd,TCSANOW,&oldtio);

}

void rd()

{

int n;//qaddr,Myaddr;

char buf[50];

n=read(fd,buf,sizeof(buf));//reading sent token

printf(":%s:%d\n",buf,n);

//qaddr=ord(buf[0]);

//Myaddr=ord("1");

if (buf[0]=='I')

{SENT=TRUE;}

}

void wt()

{

int ret1, n;

char buf[10],buf1[]="this is return from clinet";//eading buff

ret1=write(fd,buf1,sizeof(buf1));

printf(":%s:%d\n",buf1,ret1);

}

main()

{

openserial();

rd();

sleep(2);

if (SENT)

{

wt();

}

else

{

write(fd,"wrong addr",10);

printf("it is not my addr:17\n");

}

close(fd);

}

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