大概流程就是打开一个串口、然后进行串口设置。开启二个线程，一个线程写数据，另一个线程读数据。
代码如下：
#include <stdio.h>
#include <stdlib.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 <pthread.h>
#include <sys/time.h> #define MAX 2
pthread_t thread[2];
pthread_mutex_t mut;
int fd; int set_port(int fd,int nbits)
{
struct termios newtio,oldtio;
if(tcgetattr(fd,&oldtio)!=0)
{
perror("pei zhi cuo wu1\n");
return -1;
} bzero(&newtio,sizeof(newtio)); //清零
newtio.c_cflag |=CLOCAL|CREAD;//用于本地连接和接收使能 newtio.c_cflag &=~CSIZE;//设置数据位
switch(nbits)
{
case 7:
newtio.c_cflag |=CS7;break;
case 8:
newtio.c_cflag |=CS8;break;
} //设置奇校验位
newtio.c_cflag |=PARENB; //设置波特率
cfsetispeed(&newtio,B115200);
cfsetospeed(&newtio,B115200); //设置停止位
newtio.c_cflag &=~PARENB; if((tcsetattr(fd,TCSANOW,&newtio))!=0)
{
perror("pei zhi cuo wu2\n");
return -1;
} printf("bao cun wan bi \n");
return 0;
} void *thread1()
{
int i;
printf ("thread1 \n");
for( i=0;i<MAX;i++){
pthread_mutex_lock(&mut);
if(i==0){
printf("write %d\n",i+1);
char buf1[]="AT+FCLASS=0\r\n";
int length=sizeof(buf1);
int j=write(fd,buf1,length);
puts(buf1);
if(j<0)printf("fa song shi bai\n");
printf("%d \n",j);
}
else if(i==1){
printf("write %d\n",i+1);
char buf2[]="AT+CBST=7,0,0\r\n";
int length=sizeof(buf2);
int j=write(fd,buf2,length);
puts(buf2);
if(j<0)printf("fa song shi bai\n");
printf("%d \n",j); }
sleep(3);
pthread_mutex_unlock(&mut);
}
printf("thread1 stop\n");
pthread_exit(NULL); } void *thread2()
{
int j;
sleep(1);
printf("thread2\n");
char buf[100];
for (j = 0; j< MAX; j++)
{
pthread_mutex_lock(&mut);
sleep(3);
printf("read %d\n",j+1);
int k=read(fd,buf,100);
printf("k+%d\n",k);
puts(buf);
pthread_mutex_unlock(&mut);
sleep(2);
}
printf("thread2 :stop\n");
pthread_exit(NULL); } void thread_create(void)
{
int temp;
memset(&thread, 0, sizeof(thread)); //comment1
/*创建线程*/
if((temp = pthread_create(&thread[0], NULL, thread1, NULL)) != 0) //comment2
printf("xian chegn 1 faile\n");
else
printf("xian cheng 1 chegn gong\n"); if((temp = pthread_create(&thread[1], NULL, thread2, NULL)) != 0) //comment3
printf("2 faile\n");
else
printf("2 surcess\n");
} void thread_wait(void)
{
/*等待线程结束*/
if(thread[0] !=0) { //comment4
pthread_join(thread[0],NULL);
printf("1 stop \n");
}
if(thread[1] !=0) { //comment5
pthread_join(thread[1],NULL);
printf("2 stop \n");
}
} int main(void) {
int i,j,k;
fd=open("/dev/ttyS2",O_RDWR|O_NOCTTY|O_NDELAY);
if(-1==fd)printf("mei da kai tong xin duan kou hao\n");
else
{
i=set_port(fd, 8);
if(i<0)
{
perror("pei zhi cuo wu3\n");
return 0;
}
pthread_mutex_init(&mut,NULL);
printf("creat preadth\n");
thread_create();
printf("chu li \n");
thread_wait();
close(fd);
}
return 0; }