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错误提示：
[root@localhost share]# /usr/local/arm/4.1.1-920t/bin/arm-linux-gcc shouda.c
/tmp/ccqmnwMM.o: In function `open_port':
shouda.c:(.text+0x474): undefined reference to `fcnt1'
shouda.c:(.text+0x49c): undefined reference to `fcnt1'
/tmp/ccqmnwMM.o: In function `main':
shouda.c:(.text+0x594): undefined reference to `set_opt'
collect2: ld returned 1 exit status
代码
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <stdlib.h>
int ser_opt(int fd, int nSpeed, int nBits, char nEvent, int nStop)
{
struct termios newtio,oldtio;
/*保存测试现有串口参数设置，在这里如果串口号等出错，会有相关的出错信息*/
if(tcgetattr( fd,&oldtio)!=0)
{
perror("SetupSerial 1");
return -1;
}
bzero(&newtio,sizeof(newtio));
/*步骤一，设置字符大小*/
newtio.c_cflag |=CLOCAL | CREAD;
newtio.c_cflag &=~CSIZE;
/*设置停止位*/
switch(nBits)
{
case 7:
newtio.c_cflag |=CS7;
break;
case 8:
newtio.c_cflag |=CS8;
break;
}
/*设置奇偶函数*/
switch(nEvent)
{
case 'O'://奇数
newtio.c_cflag |=PARENB;
newtio.c_cflag |=PARODD;
newtio.c_iflag |=(INPCK | ISTRIP);
break;
case 'E'://偶数
newtio.c_iflag |=(INPCK | ISTRIP);
newtio.c_cflag |=PARENB;
newtio.c_cflag &=~PARODD;
break;
case 'N'://无奇偶校验
newtio.c_cflag &=~PARENB;
break;
}
/*设置波特率*/
switch(nSpeed)
{
case 2400:
cfsetispeed(&newtio,B2400);
cfsetospeed(&newtio,B2400);
break;
case 4800:
cfsetispeed(&newtio,B4800);
cfsetospeed(&newtio,B4800);
break;
case 9600:
cfsetispeed(&newtio,B9600);
cfsetospeed(&newtio,B9600);
break;
case 19200:
cfsetispeed(&newtio,B19200);
cfsetospeed(&newtio,B19200);
break;
case 115200:
cfsetispeed(&newtio,B115200);
cfsetospeed(&newtio,B115200);
break;
case 460800:
cfsetispeed(&newtio,B460800);
cfsetospeed(&newtio,B460800);
break;
default:
cfsetispeed(&newtio,B9600);
cfsetospeed(&newtio,B9600);
break;
}
/*设置停止位*/
if(nStop==1)
newtio.c_cflag &= ~CSTOPB;
else if (nStop == 2)
newtio.c_cflag |= CSTOPB;
/*设置等待时间和最小接收字符*/
newtio.c_cc[VTIME] = 0;
newtio.c_cc[VMIN] = 0;
/*处理未接收字符*/
tcflush(fd,TCIFLUSH);
/*激活新配置*/
if((tcsetattr(fd,TCSANOW,&newtio))!=0)
{
perror("com set error");
return -1;
}
printf("set done!\n");
return 0;
}
/*打开串口函数*/
int open_port(int fd,int comport)
{
char *dev[]={"/dev/ttyS0","/dev/ttyS1","/dev/ttyS2"};
long vdisable;
if (comport==1)//串口1
{ fd = open("/dev/ttyS0",O_RDWR|O_NOCTTY|O_NDELAY);
if(-1==fd){
perror("Can't Open Serial Port");
return(-1);
}
}
else if (comport==2)//串口2
{ fd = open("/dev/ttyS1",O_RDWR|O_NOCTTY|O_NDELAY);
if(-1==fd){
perror("Can't Open Serial Port");
return(-1);
}
}
else if (comport==3)//串口3
{ fd = open("/dev/ttyS2",O_RDWR|O_NOCTTY|O_NDELAY);
if(-1==fd){
perror("Can't Open Serial Port");
return(-1);
}
}
/*恢复串口为阻塞状态*/
if(fcnt1(fd,F_SETFL,0)<0)
printf("fcnt1 failed!\n");
else
printf("fcnt1=%d\n",fcnt1(fd,F_SETFL,0));
/*测试是否为终端设备*/
if(isatty(STDIN_FILENO)==0)
printf("standard input is not a terminal device \n");
else
printf("isatty success!\n");
printf("fd-open=%d\n",fd);
return fd;
}
/*读串口程序*/
int main(void)
{
int fd;
int nread,i;
char buff[]="Hello\n";
if((fd=open_port(fd,1))<0){//打开串口
perror("open_port error");
return;
}
if((i=set_opt(fd,19200,8,'N',1))<0){//设置串口
perror("set_opt error");
return;
}
printf("fd=%d\n",fd);
fd=3;
nread=read(fd,buff,8);//读串口
printf("nread=%d,%s\n",nread,buff);
close(fd);
return;
} |
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.png "2015年中国系统架构师大会
日期:2015-06-29 16:11:28")
发表于 2008-10-22 06:48
.text+0x474): undefined reference to `fcnt1'
;
;//读串口
