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我采用的是轮询的方式，如果检测到以b开头以*结尾的数据就接收，但是波特率只能到2400，设为9600时接收几次后就会出现几比特的丢失，波特率设的越大丢数的情况出现的就越频繁，这是为什么，谢谢。
#include "vxWorks.h"
#include "stdio.h"
#include "stdLib.h"

#include "hostLib.h"
#include "sysLib.h"
#include "semLib.h"
#include "taskLib.h"
#include "fioLib.h"
#include "iosLib.h"
#include "nfsLib.h"
#include "selectLib.h"

#include "tyLib.h"
#include "logLib.h"

#include "sioLib.h"

#define SEIRAL_MAX_BUFFER 2048

struct fd_set readFds;
struct fd_set writeFds;
int serialFd;

int real_len;
char buffer1[1024];
int width;
int nBytesUnread=0;
BOOL flag_R;
BOOL flag_T;

STATUS seriInit()
{

if((serialFd=open("/tyCo/1",O_RDWR,0))==ERROR)
{
printf("Error open serial device\n");
return(ERROR);
}
else
printf("Open serial device sucess\n");


ioctl(serialFd,FIOSETOPTIONS,OPT_TERMINAL&OPT_RAW);

ioctl(serialFd,FIOBAUDRATE,9600);

ioctl(serialFd,SIO_HW_OPTS_SET,CS8);

ioctl(serialFd,FIORBUFSET,SEIRAL_MAX_BUFFER );

ioctl(serialFd,FIOWBUFSET,SEIRAL_MAX_BUFFER );

ioctl(serialFd,FIOFLUSH,0);

}

STATUS seriRecv()
{
int i;
int len;

int nBytesUnread;
char temp;
int rev_flg=0;

real_len=0;

while(1)
{
FD_ZERO(&readFds);
FD_SET(serialFd,&readFds);

width=serialFd+1;

if(select(width,&readFds,NULL,NULL,NULL)==ERROR)
{
perror("the select of serials is error\n");
return(ERROR);
}

ioctl(serialFd,FIONREAD,&nBytesUnread);
if(nBytesUnread==0)
{
continue;
}

if(read(serialFd,&temp,1)==ERROR)
{
perror("the read error\n");
continue;

}

printf("%c",temp);
if(temp=='b')
{
rev_flg=1;
real_len=0;
continue;
}
if(rev_flg!=1)
continue;
if(temp!='*')
{
buffer1[real_len]=temp;
real_len++;
continue;
}
else if(temp=='*')
{
rev_flg=0;

for(i=0;i<real_len;i++)
{
printf("%c",buffer1[i]);
}
printf("\n");
printf("reak_len=%d\n",real_len);
flag_R=1;

if(ioctl(serialFd,FIORFLUSH,0)==ERROR)
{
return ERROR;

}

printf("\n");
}
else
continue;

printf("\n");
}


}

STATUS serial()
{
seriInit();
seriRecv();
}

void seriStop()
{
if(serialFd)
close(serialFd);
}