通过终端模拟虚拟串口进行读写
#include <termios.h>#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/signal.h>
#include <pthread.h>
#define BAUDRATE B115200
#define COM1 "/dev/pts/3"
#define COM2 "/dev/pts/4"
#define ENDMINITERM1 27
#define ENDMINITERM2 3
#define FALSE 0
#define TRUE 1
volatile int STOP=FALSE;
volatile int fd;
void child_handler(int s)
{
printf("stop!!!\n");
STOP=TRUE;
}
void* keyboard(void * data)
{
char c;
for (;;){
scanf("%c",&c);
printf("getchar is :%d",c);
if( (c==ENDMINITERM1) || (c==ENDMINITERM2)){
printf("break\n");
STOP=TRUE;
break ;
}
}
return NULL;
}
void* receive(void * data)
{
int c;
printf("read modem\n");
while (STOP==FALSE)
{
read(fd,&c,1);
write(1,&c,1);
}
printf("exit from reading modem\n");
return NULL;
}
void* send(void * data)
{
int c='0';
printf("send data\n");
while (STOP==FALSE)
{
c++;
c %= 255;
write(fd,&c,1);
usleep(100000);
}
return NULL;
}
int main(int argc,char** argv)
{
struct termios oldtio,newtio;
struct sigaction sa;
int ok;
pthread_t th_a, th_b, th_c;
void * retval;
if( argc > 1)
fd = open(COM1, O_RDWR );
else
fd = open(COM2, O_RDWR );
if (fd <0) {
perror(COM1);
exit(-1);
}
printf("\nOpen COM Port Successfull\n");
tcgetattr(fd,&oldtio);
tcflush(fd,TCIOFLUSH);
cfsetispeed(&newtio,BAUDRATE);
cfsetospeed(&newtio,BAUDRATE);
newtio.c_cflag &= ~CSIZE;
newtio.c_cflag |= CS8;
newtio.c_cflag &= ~PARENB;
newtio.c_iflag &= ~INPCK;
newtio.c_cflag &= ~CSTOPB;
newtio.c_cc=1;
newtio.c_cc=0;
tcflush(fd, TCIFLUSH);
if(tcsetattr(fd,TCSANOW,&newtio) != 0) {
perror("\n");
return 0;
}
sa.sa_handler = child_handler;
sa.sa_flags = 0;
sigaction(SIGCHLD,&sa,NULL);
pthread_create(&th_a, NULL, keyboard, 0);
pthread_create(&th_b, NULL, receive, 0);
pthread_create(&th_c, NULL, send, 0);
pthread_join(th_a, &retval);
pthread_join(th_b, &retval);
pthread_join(th_c, &retval);
tcsetattr(fd,TCSANOW,&oldtio);
close(fd);
exit(0);
}
/*求大佬们改成手动从输入端口输入字符然后在接收端上显示字符，我是小白多写点注释，谢谢谢谢*/ // 代码中存在一些问题，需要进行修改以实现从输入端口输入字符，然后在接收端口上显示字符
#include <termios.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/signal.h>
#include <pthread.h>
#define BAUDRATE B115200
#define COM1 "/dev/pts/3" // 输入端口
#define COM2 "/dev/pts/4" // 接收端口
#define ENDMINITERM1 27
#define ENDMINITERM2 3
#define FALSE 0
#define TRUE 1
volatile int STOP = FALSE;
volatile int fd;
void child_handler(int s) {
printf("停止!!!\n");
STOP = TRUE;
}
void* keyboard(void* data) {
char c;
printf("请输入字符：\n");
while (!STOP) {
c = getchar(); // 从输入端口读取字符
if (c == ENDMINITERM1 || c == ENDMINITERM2) {
printf("终止\n");
STOP = TRUE;
break;
}
write(fd, &c, 1); // 将字符写入接收端口
}
return NULL;
}
void* receive(void* data) {
char c;
printf("接收数据\n");
while (!STOP) {
read(fd, &c, 1); // 从接收端口读取字符
write(1, &c, 1); // 将字符显示在控制台上
}
printf("退出接收数据\n");
return NULL;
}
int main(int argc, char** argv) {
// ...（省略部分代码）
if (argc > 1)
fd = open(COM1, O_RDWR);
else
fd = open(COM2, O_RDWR);
if (fd < 0) {
perror(COM1);
exit(-1);
}
printf("\n打开COM端口成功\n");
tcgetattr(fd, &oldtio);
// ...（省略部分代码）
pthread_create(&th_a, NULL, keyboard, 0);
pthread_create(&th_b, NULL, receive, 0);
pthread_join(th_a, &retval);
pthread_join(th_b, &retval);
// ...（省略部分代码）
exit(0);
}
这段代码的目的是从输入端口读取字符并将其写入接收端口，然后从接收端口读取字符并在控制台上显示。在 keyboard 函数中，使用 getchar 从输入端口读取字符，然后将字符写入接收端口。在 receive 函数中，从接收端口读取字符并在控制台上显示。 这段代码是一个简单的串口通讯示例，但有一些问题需要修复。首先，你需要在接收端和发送端之间建立虚拟串口连接，以便进行通信。其次，需要修改键盘输入的部分，使其能够手动从输入端口输入字符。下面是修改后的代码：
#include <termios.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/signal.h>
#include <pthread.h>
#define BAUDRATE B115200
#define COM1 "/dev/pts/3"
#define COM2 "/dev/pts/4"
#define ENDMINITERM1 27
#define ENDMINITERM2 3
#define FALSE 0
#define TRUE 1
volatile int STOP=FALSE;
volatile int fd;
void child_handler(int s) {
printf("stop!!!\n");
STOP=TRUE;
}
void* receive(void * data) {
char c;
printf("read modem\n");
while (STOP==FALSE) {
read(fd,&c,1);
write(1,&c,1);
}
printf("exit from reading modem\n");
return NULL;
}
void* send(void * data) {
char c;
printf("send data\n");
while (STOP==FALSE) {
c = getchar();// 从输入端口手动输入字符
write(fd,&c,1);
}
return NULL;
}
int main(int argc,char** argv) {
struct termios oldtio,newtio;
int ok;
pthread_t th_b, th_c;
void * retval;
if( argc > 1)
fd = open(COM1, O_RDWR );
else
fd = open(COM2, O_RDWR );
if (fd < 0) {
perror(COM1);
exit(-1);
}
printf("\nOpen COM Port Successfull\n");
tcgetattr(fd,&oldtio);
tcflush(fd,TCIOFLUSH);
cfsetispeed(&newtio,BAUDRATE);
cfsetospeed(&newtio,BAUDRATE);
newtio.c_cflag &= ~CSIZE;
newtio.c_cflag |= CS8;
newtio.c_cflag &= ~PARENB;
newtio.c_iflag &= ~INPCK;
newtio.c_cflag &= ~CSTOPB;
newtio.c_cc=1;
newtio.c_cc=0;
tcflush(fd, TCIFLUSH);
if(tcsetattr(fd,TCSANOW,&newtio) != 0) {
perror("\n");
return 0;
}
pthread_create(&th_b, NULL, receive, 0);
pthread_create(&th_c, NULL, send, 0);
pthread_join(th_b, &retval);
pthread_join(th_c, &retval);
tcsetattr(fd,TCSANOW,&oldtio);
close(fd);
exit(0);
}
这个修改后的代码允许你在输入端口手动输入字符，然后在接收端显示字符。希望对你有所帮助。
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